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032：基于Consul和MGR的MySQL高可用架构

一、Consul

1、Consul简介

Consul是HashiCorp公司推出的一款开源工具，基于go语言开发，用于实现分布式系统的服务发现与配置。

官网： https://www.consul.io/

Consul的优势：

多数据中心服务发现（DNS + HTTP）
支持健康检查.
单数据中心微服务
内置Web UI，用于编辑K/V和查看健康检查状态
支持热配置，不用重启服务
支持编排任务

基础架构：

Consul Cluster由部署和运行了Consul Agent的节点组成。在Cluster中有两种角色:Server和 Client。
Server和Client的角色和Consul Cluster上运行的应用服务无关, 是基于Consul层面的一种角色划分.
Consul Server: 用于维护Consul Cluster的状态信息，实现数据一致性，响应RPC请求。

官方建议是: 至少要运行3个或者3个以上的Consul Server。多个server之中需要选举一个leader, 这个选举过程Consul基于Raft协议实现. 多个Server节点上的Consul数据信息保持强一致性。在局域网内与本地客户端通讯，通过广域网与其他数据中心通讯。
Consul Client: 只维护自身的状态, 并将HTTP和DNS接口请求转发给服务端。
Consul 支持多数据中心，多个数据中心要求每个数据中心都要安装一组Consul cluster，多个数据中心间基于gossip protocol协议来通讯，使用Raft算法实现一致性

2、准备环境

hosts	ip	software	consul.json	service_json_01	service_json_02	script01	script02
node01	192.168.222.171	mysql	Client.json	mysql_mgr_write_3306.json	mysql_mgr_read_3306.json	check_mysql_mgr_master.sh	check_mysql_mgr_slave.sh
node02	192.168.222.172	mysql	Client.json	mysql_mgr_write_3306.json	mysql_mgr_read_3306.json	check_mysql_mgr_master.sh	check_mysql_mgr_slave.sh
node03	192.168.222.173	mysql	Client.json	mysql_mgr_write_3306.json	mysql_mgr_read_3306.json	check_mysql_mgr_master.sh	check_mysql_mgr_slave.sh
node04	192.168.222.174	mysql	Client.json	mysql_mgr_write_3306.json	mysql_mgr_read_3306.json	check_mysql_mgr_master.sh	check_mysql_mgr_slave.sh
node05	192.168.222.175	mysql
node06	192.168.222.176	mysql
node09	192.168.222.179		server.json
node10	192.168.222.180		server.json
node11	192.168.222.181		server.json
node12	192.168.222.182	porxysql	Client.json	proxysql.json		proxysql_check.sh
audit01	192.168.222.199	porxysql	Client.json	proxysql.json		proxysql_check.sh

node05、node06部署成单机多实例MGR，端口分别（33061~33065）

3、Consul 安装

这里采用ansible安装，不累述了

步骤如下：

--每台都安装consul
cd /software
wget https://releases.hashicorp.com/consul/1.4.0/consul_1.4.0_linux_amd64.zip
unzip /software/consul_1.4.0_linux_amd64.zip
cp /software/consul /usr/local/bin/
consul --version
--所有主机都创建目录/etc/consul.d/scripts/和/data/consul/，分别是放配置文件、存放数据的、mysql的健康检查脚本。
mkdir -p /etc/consul.d/scripts &&  mkdir -p /data/consul/

[root@node12 consul.d]# tree /etc/consul.d
/etc/consul.d
├── client.json
├── proxysql.json
└── scripts
    └── proxysql_check.sh

1 directory, 3 files
[root@node12 consul.d]# tree /data/consul/  --初始/data/consul/是空目录
/data/consul/
├── checkpoint-signature
├── consul.log
├── node-id
├── proxy
│   └── snapshot.json
├── serf
│   └── local.snapshot
└── services

3 directories, 5 files
[root@node12 consul.d]#

4、Consul配置文件

consul server 配置文件

advertise_addr（主机IP）和node_name(主机名),（node09、node10、node11）三个主机修改对应信息

"domain":"gczheng", 所以后缀是servers.gczheng

[root@node09 ~]# cat /etc/consul.d/server.json 
{
    "addresses":{
        "http":"0.0.0.0",
        "dns":"0.0.0.0"
    },
    "bind_addr":"0.0.0.0",
    "advertise_addr":"192.168.222.179",
    "bootstrap_expect":3,
    "datacenter":"dc1",
    "data_dir":"/data/consul",
    "dns_config":{
        "allow_stale":true,
        "max_stale":"87600h",
        "node_ttl":"0s",
        "service_ttl":{
            "*":"0s"
        }
    },
    "domain":"gczheng",
    "enable_syslog":false,
    "leave_on_terminate":false,
    "log_level":"info",
    "node_name":"node09.test.com",
    "node_meta":{
        "location":"gczheng"
    },
    "performance":{
        "raft_multiplier":1
    },
    "ports":{
        "http":8500,
        "dns":53
    },
    "reconnect_timeout":"72h",
    "recursors":[
        "192.168.222.179",
        "192.168.222.180",
        "192.168.222.181"
    ],
    "retry_join":[
        "192.168.222.179",
        "192.168.222.180",
        "192.168.222.181"
    ],
    "retry_interval":"10s",
    "server":true,
    "skip_leave_on_interrupt":true,
    "ui":true
}

[root@node09 ~]#

consul client 配置文件

bind_addr修改为成对应的主机ip(node01、node02、node03、node04、node05、node06、node12、audit01)

[root@node01 consul.d]# cat /etc/consul.d/client.json 
{
"data_dir": "/data/consul",
"enable_script_checks": true,
"bind_addr": "192.168.222.171",
"retry_join": ["192.168.222.179"],
"retry_interval": "30s",
"rejoin_after_leave": true,
"start_join": ["192.168.222.179"],
"datacenter": "dc1"
}

proxysql 配置文件

[root@audit01 consul.d]# cat proxysql.json

{
    "services": 
    [{
        "id": "proxy1",
        "name": "proxysql",
        "address": "",
        "tags": ["mysql_proxy"],
        "port": 6033,
        "check": {
                "args": ["/etc/consul.d/scripts/proxysql_check.sh", "192.168.222.199"],
                "interval": "5s"
            },
        "id": "proxy2",
        "name": "proxysql",
        "address": "",
        "tags": ["mysql_proxy"],
        "port": 6033,
        "check":
            {
                "args": ["/etc/consul.d/scripts/proxysql_check.sh", "192.168.222.182"],
                "interval": "5s"
            }
        
    }]
}

mysql_mgr_write_3306.json

[root@node02 consul.d]# cat mysql_mgr_write_3306.json

{
  "services": [{
    "id": "mysql_write",
    "name": "mysql_3306_w",
    "address": "",
    "port": 3306,
    "enable_tag_override": false,
    "checks": [{
      "id": "mysql_w_c_01",
      "name": "MySQL Write Check",
      "args": ["/etc/consul.d/scripts/check_mysql_mgr_master.sh", "3306"],
      "interval": "15s",
      "timeout": "1s",
      "service_id": "mysql_w"
    }]
  }]
}
[root@node02 consul.d]#

mysql_mgr_read_3306.json

[root@node02 consul.d]# cat mysql_mgr_read_3306.json
{
    "services": [{
        "id": "mysql_read",
        "name": "mysql_3306_r",
        "address": "",
        "port": 3306,
        "enable_tag_override": false,
        "checks": [{
            "id": "mysql_r_c_01",
            "name": "MySQL read Check",
            "args": ["/etc/consul.d/scripts/check_mysql_mgr_slave.sh", "3306"],
            "interval": "15s",
            "timeout": "1s",
            "service_id": "mysql_r"
        }]
    }]
}

5、Consul 服务检查脚本

check_mysql_mgr_master.sh

#!/bin/bash
port=$1
user="gcdb"
passwod="iforgot"
comm="/usr/local/mysql/bin/mysql -u$user -h127.0.0.1 -P $port -p$passwod"
value=`$comm -Nse "select 1"`
primary_member=`$comm -Nse "select variable_value from performance_schema.global_status WHERE VARIABLE_NAME= 'group_replication_primary_member'"`
server_uuid=`$comm -Nse "select variable_value from performance_schema.global_variables where VARIABLE_NAME='server_uuid';"`
# 判断MySQL是否存活
if [ -z $value ]
then
   echo "mysql $port is down....."
   exit 2
fi
# 判断节点状态,是否存活
node_state=`$comm -Nse "select MEMBER_STATE from performance_schema.replication_group_members where MEMBER_ID='$server_uuid'"`
if [ $node_state != "ONLINE" ]
then
   echo "MySQL $port state is not online...."
   exit 2
fi
# 先判断MGR模式，在判断是否主节点
if [ -z "$primary_member" ]
then 
    echo "primary_member is empty,MGR is multi-primary mode" 
    exit 0
else
  if [[ $server_uuid == $primary_member ]]
  then
     echo "MySQL $port Instance is master ........"
     exit 0
  else
     echo "MySQL $port Instance is slave ........"
     exit 2
  fi
fi

# 判断是不是主节点
if [[ $server_uuid == $primary_member ]]
then
   echo "MySQL $port Instance is master ........"
   exit 0
else
   echo "MySQL $port Instance is slave ........"
   exit 2
fi

check_mysql_mgr_slave.sh

#!/bin/bash
port=$1
user="gcdb"
passwod="iforgot"
comm="/usr/local/mysql/bin/mysql -u$user -h127.0.0.1 -P $port -p$passwod"
value=`$comm -Nse "select 1"`
primary_member=`$comm -Nse "select variable_value from performance_schema.global_status WHERE VARIABLE_NAME= 'group_replication_primary_member'"`
server_uuid=`$comm -Nse "select variable_value from performance_schema.global_variables where VARIABLE_NAME='server_uuid';"`
# 判断mysql是否存活
if [ -z $value ]
then
   echo "mysql $port is down....."
   exit 2
fi
# 判断节点状态
node_state=`$comm -Nse "select MEMBER_STATE from performance_schema.replication_group_members where MEMBER_ID='$server_uuid'"`
if [ $node_state != "ONLINE" ]
then
   echo "MySQL $port state is not online...."
   exit 2
fi


# 先判断MGR模式，再判断是否主节点
if [ -z "$primary_member" ]
then 
    echo "primary_member is empty,MGR is multi-primary mode" 
    exit 2
else
    # 判断是不是主节点
    if [[ $server_uuid != $primary_member ]]
    then
       echo "MySQL $port Instance is slave ........"
       exit 0
    else
       node_num=`$comm -Nse "select count(*) from performance_schema.replication_group_members"`
    # 判断如果没有任何从节点，主节点也注册从角色服务。
       if [ $node_num -eq 1 ]
       then
           echo "MySQL $port Instance is slave ........"
           exit 0
       else
           echo "MySQL $port Instance is master ........"
           exit 2
       fi
    fi
fi

两个脚本放在/etc/consul.d/scripts/路径下授权执行权限。

[root@node01 ~]# chmod 755 /etc/consul.d/scripts/*
[root@node01 ~]# ll /etc/consul.d/scripts/ |grep check_mysql_mgr
-rwxr-xr-x 1 root root 1331 Dec  4 15:05 check_mysql_mgr_master.sh
-rwxr-xr-x 1 root root 1489 Dec  4 15:05 check_mysql_mgr_slave.sh

proxysql_check.sh

#!/bin/bash
host=$1
user="gcdb"
passwod="iforgot"
port=6033

alive_nums=`/usr/local/mysql/bin/mysqladmin ping -h$host -P$port -u$user -p$passwod |grep "mysqld is alive" |wc -l`

# 判断是不是从库
if [ $alive_nums -eq 1 ]
then
  echo "$host mysqld is alive........"
  exit 0
else
   echo "$host mysqld is failed........"
   exit 2
fi

6、Consul启动

*　consul server启动（node09、node10、node11）、clients也是用下面命令启动consul

nohup consul agent -config-dir=/etc/consul.d  > /data/consul/consul.log &

node09 启动consul join

--启动三个server节点后，node09 推举为主
[root@node09 ~]# consul operator raft list-peers
Node             ID                                    Address               State     Voter  RaftProtocol
node09.test.com  fcca17ba-8ddf-ec76-4931-5f5bfa043e05  192.168.222.179:8300  leader    true   3
node10.test.com  c95847a4-a305-ac21-4ae5-21fd16bb39c2  192.168.222.180:8300  follower  true   3
node11.test.com  8d8f6757-0ef1-79a7-d3ed-4b7e04430f88  192.168.222.181:8300  follower  true   3
[root@node09 ~]# 

--启动所有clients后，会自动加入集群，标记为client
[root@node09 ~]# consul members
Node             Address               Status  Type    Build  Protocol  DC   Segment
node09.test.com  192.168.222.179:8301  alive   server  1.4.0  2         dc1  <all>
node10.test.com  192.168.222.180:8301  alive   server  1.4.0  2         dc1  <all>
node11.test.com  192.168.222.181:8301  alive   server  1.4.0  2         dc1  <all>
node01.test.com  192.168.222.171:8301  alive   client  1.4.0  2         dc1  <default>
node02.test.com  192.168.222.172:8301  alive   client  1.4.0  2         dc1  <default>
node03.test.com  192.168.222.173:8301  alive   client  1.4.0  2         dc1  <default>
node04.test.com  192.168.222.174:8301  alive   client  1.4.0  2         dc1  <default>
node05.test.com  192.168.222.175:8301  alive   client  1.4.0  2         dc1  <default>
[root@node09 ~]# 

[root@node11 ~]# cat /data/consul/consul.log
bootstrap_expect > 0: expecting 3 servers
==> Starting Consul agent...
==> Consul agent running!
           Version: 'v1.4.0'
           Node ID: 'a1b27430-1a44-5d63-3af8-ec4a616803cc'
         Node name: 'node11.test.com'
        Datacenter: 'dc1' (Segment: '<all>')
            Server: true (Bootstrap: false)
       Client Addr: [127.0.0.1] (HTTP: 8500, HTTPS: -1, gRPC: -1, DNS: 53)
      Cluster Addr: 192.168.222.181 (LAN: 8301, WAN: 8302)
           Encrypt: Gossip: false, TLS-Outgoing: false, TLS-Incoming: false

==> Log data will now stream in as it occurs:

    2018/12/03 16:27:39 [WARN] agent: Node name "node11.test.com" will not be discoverable via DNS due to invalid characters. Valid characters include all alpha-numerics and dashes.
    2018/12/03 16:27:39 [INFO] raft: Initial configuration (index=0): []
    2018/12/03 16:27:39 [INFO] raft: Node at 192.168.222.181:8300 [Follower] entering Follower state (Leader: "")
    2018/12/03 16:27:39 [INFO] serf: EventMemberJoin: node11.test.com.dc1 192.168.222.181
    2018/12/03 16:27:39 [INFO] serf: EventMemberJoin: node11.test.com 192.168.222.181
    2018/12/03 16:27:39 [INFO] consul: Adding LAN server node11.test.com (Addr: tcp/192.168.222.181:8300) (DC: dc1)
    2018/12/03 16:27:39 [INFO] agent: Started DNS server 0.0.0.0:53 (udp)
    2018/12/03 16:27:39 [WARN] agent/proxy: running as root, will not start managed proxies
    2018/12/03 16:27:39 [INFO] consul: Handled member-join event for server "node11.test.com.dc1" in area "wan"
    2018/12/03 16:27:39 [INFO] agent: Started DNS server 0.0.0.0:53 (tcp)
    2018/12/03 16:27:39 [INFO] agent: Started HTTP server on [::]:8500 (tcp)
    2018/12/03 16:27:39 [INFO] agent: started state syncer
    2018/12/03 16:27:39 [INFO] agent: Retry join LAN is supported for: aliyun aws azure digitalocean gce k8s os packet scaleway softlayer triton vsphere
    2018/12/03 16:27:39 [INFO] agent: Joining LAN cluster...
    2018/12/03 16:27:39 [INFO] agent: (LAN) joining: [192.168.222.179 192.168.222.180 192.168.222.181]
    2018/12/03 16:27:39 [INFO] serf: EventMemberJoin: node10.test.com 192.168.222.180
    2018/12/03 16:27:39 [WARN] memberlist: Refuting a suspect message (from: node11.test.com)
    2018/12/03 16:27:39 [INFO] consul: Adding LAN server node10.test.com (Addr: tcp/192.168.222.180:8300) (DC: dc1)

consul client启动（node01、node02、node03、node04、node05、node06）

--主机分别执行启动
shell> nohup consul agent -config-dir=/etc/consul.d  > /data/consul/consul.log &

--node01的启动过程
[root@node01 ~]# cat /data/consul/consul.log |egrep -v ERR  /data/consul/consul.log |egrep -v 'ERR|WARN' 
==> Starting Consul agent...
==> Joining cluster...
    Join completed. Synced with 1 initial agents
==> Consul agent running!
           Version: 'v1.4.0'
           Node ID: 'feb4c253-f861-fbe0-10c8-50ff7bbbbf17'
         Node name: 'node01.test.com'
        Datacenter: 'dc1' (Segment: '')
            Server: false (Bootstrap: false)
       Client Addr: [127.0.0.1] (HTTP: 8500, HTTPS: -1, gRPC: -1, DNS: 8600)
      Cluster Addr: 192.168.222.171 (LAN: 8301, WAN: 8302)
           Encrypt: Gossip: false, TLS-Outgoing: false, TLS-Incoming: false

==> Log data will now stream in as it occurs:

    2018/12/03 15:30:04 [INFO] serf: EventMemberJoin: node01.test.com 192.168.222.171
    2018/12/03 15:30:04 [INFO] serf: Attempting re-join to previously known node: node04.test.com: 192.168.222.174:8301
    2018/12/03 15:30:04 [INFO] agent: Started DNS server 127.0.0.1:8600 (udp)
    2018/12/03 15:30:04 [INFO] agent: Started DNS server 127.0.0.1:8600 (tcp)
    2018/12/03 15:30:04 [INFO] agent: Started HTTP server on 127.0.0.1:8500 (tcp)
    2018/12/03 15:30:04 [INFO] agent: (LAN) joining: [192.168.222.179]
    2018/12/03 15:30:04 [INFO] agent: Retry join LAN is supported for: aliyun aws azure digitalocean gce k8s os packet scaleway softlayer triton vsphere
    2018/12/03 15:30:04 [INFO] agent: Joining LAN cluster...
    2018/12/03 15:30:04 [INFO] agent: (LAN) joining: [192.168.222.179]
    2018/12/03 15:30:04 [INFO] serf: EventMemberJoin: node09.test.com 192.168.222.179
    2018/12/03 15:30:04 [INFO] serf: EventMemberJoin: node11.test.com 192.168.222.181
    2018/12/03 15:30:04 [INFO] serf: EventMemberJoin: node10.test.com 192.168.222.180
    2018/12/03 15:30:04 [INFO] serf: EventMemberJoin: node04.test.com 192.168.222.174
    2018/12/03 15:30:04 [INFO] consul: adding server node09.test.com (Addr: tcp/192.168.222.179:8300) (DC: dc1)
    2018/12/03 15:30:04 [INFO] consul: adding server node11.test.com (Addr: tcp/192.168.222.181:8300) (DC: dc1)
    2018/12/03 15:30:04 [INFO] consul: adding server node10.test.com (Addr: tcp/192.168.222.180:8300) (DC: dc1)
    2018/12/03 15:30:04 [INFO] serf: EventMemberJoin: node05.test.com 192.168.222.175
    2018/12/03 15:30:04 [INFO] serf: Re-joined to previously known node: node04.test.com: 192.168.222.174:8301
    2018/12/03 15:30:04 [INFO] serf: EventMemberJoin: node03.test.com 192.168.222.173
    2018/12/03 15:30:04 [INFO] serf: EventMemberJoin: node02.test.com 192.168.222.172
    2018/12/03 15:30:04 [INFO] agent: (LAN) joined: 1 Err: <nil>
    2018/12/03 15:30:04 [INFO] agent: started state syncer
    2018/12/03 15:30:04 [INFO] agent: (LAN) joined: 1 Err: <nil>
    2018/12/03 15:30:04 [INFO] agent: Join LAN completed. Synced with 1 initial agents
    2018/12/03 15:30:04 [INFO] agent: Synced node info
    2018/12/03 15:30:05 [INFO] agent: Caught signal:  hangup
    2018/12/03 15:30:05 [INFO] agent: Reloading configuration...

[root@node01 ~]# consul members
Node             Address               Status  Type    Build  Protocol  DC   Segment
node09.test.com  192.168.222.179:8301  alive   server  1.4.0  2         dc1  <all>
node10.test.com  192.168.222.180:8301  alive   server  1.4.0  2         dc1  <all>
node11.test.com  192.168.222.181:8301  alive   server  1.4.0  2         dc1  <all>
node01.test.com  192.168.222.171:8301  alive   client  1.4.0  2         dc1  <default>
node02.test.com  192.168.222.172:8301  alive   client  1.4.0  2         dc1  <default>
node03.test.com  192.168.222.173:8301  alive   client  1.4.0  2         dc1  <default>
node04.test.com  192.168.222.174:8301  alive   client  1.4.0  2         dc1  <default>
node05.test.com  192.168.222.175:8301  alive   client  1.4.0  2         dc1  <default>
[root@node01 ~]#

更新consul配置执行刷新

--刷新consul
[root@node01 ~]# consul  reload
Configuration reload triggered
[root@node01 ~]#

二、MGR搭建

1、MGR配置

直接使用杨建荣的快速搭建mgr脚本，配置多实例（node05）（一主四从）
- 脚本地址：Github
手动搭建MGR（node01、node02、node03、node04）（多主模式）
- 请自行搭建
MGR默认账号
- GRANT REPLICATION SLAVE ON *.* TO rpl_user@'%' IDENTIFIED BY 'rpl_pass';
- GRANT ALL ON *.* TO 'gcdb'@'%' IDENTIFIED BY 'iforgot';

2、MGR查看

（node01、node02、node03、node04）（多主模式）MGR启动完如下：

mysql> SELECT * FROM performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-----------------+-------------+--------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST     | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-----------------+-------------+--------------+
| group_replication_applier | 30955199-ebdc-11e8-ac1f-005056ab820e | node04.test.com |        3306 | ONLINE       |
| group_replication_applier | 8770cc17-ebdb-11e8-981b-005056ab9fa5 | node01.test.com |        3306 | ONLINE       |
| group_replication_applier | c38416c3-ebd4-11e8-9b2c-005056aba7b5 | node03.test.com |        3306 | ONLINE       |
| group_replication_applier | e5dba457-f6d5-11e8-97ca-005056abaf95 | node02.test.com |        3306 | ONLINE       |
+---------------------------+--------------------------------------+-----------------+-------------+--------------+
4 rows in set (0.00 sec)

mysql> SELECT member_id,member_host,member_port,member_state,IF (global_status.variable_name IS NOT NULL,'primary','secondary') AS member_role FROM PERFORMANCE_SCHEMA.replication_group_members LEFT JOIN PERFORMANCE_SCHEMA.global_status ON global_status.variable_name='group_replication_primary_member' AND global_status.variable_value=replication_group_members.member_id;
+--------------------------------------+-----------------+-------------+--------------+-------------+
| member_id                            | member_host     | member_port | member_state | member_role |
+--------------------------------------+-----------------+-------------+--------------+-------------+
| 30955199-ebdc-11e8-ac1f-005056ab820e | node04.test.com |        3306 | ONLINE       | secondary   |
| 8770cc17-ebdb-11e8-981b-005056ab9fa5 | node01.test.com |        3306 | ONLINE       | secondary   |
| c38416c3-ebd4-11e8-9b2c-005056aba7b5 | node03.test.com |        3306 | ONLINE       | secondary   |
| e5dba457-f6d5-11e8-97ca-005056abaf95 | node02.test.com |        3306 | ONLINE       | secondary   |
+--------------------------------------+-----------------+-------------+--------------+-------------+
4 rows in set (0.00 sec)

mysql>

（node05）（一主四从）MGR启动完如下：

mysql> SELECT * FROM performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-----------------+-------------+--------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST     | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-----------------+-------------+--------------+
| group_replication_applier | 0ea53bea-ec72-11e8-913c-005056ab74f8 | node05.test.com |       33062 | ONLINE       |
| group_replication_applier | 331664a5-ec72-11e8-a6f0-005056ab74f8 | node05.test.com |       33063 | ONLINE       |
| group_replication_applier | 54f7be9e-ec72-11e8-ba6c-005056ab74f8 | node05.test.com |       33064 | ONLINE       |
| group_replication_applier | 779b4473-ec72-11e8-8f08-005056ab74f8 | node05.test.com |       33065 | ONLINE       |
| group_replication_applier | ee039eb5-ec71-11e8-bd33-005056ab74f8 | node05.test.com |       33061 | ONLINE       |
+---------------------------+--------------------------------------+-----------------+-------------+--------------+
5 rows in set (0.00 sec)
mysql> select member_id,member_host,member_port,member_state,if (global_status.variable_name is not null,'primary','secondary') as member_role from performance_schema.replication_group_members left join performance_schema.global_status on global_status.variable_name='group_replication_primary_member' and global_status.variable_value=replication_group_members.member_id;
+--------------------------------------+-----------------+-------------+--------------+-------------+
| member_id                            | member_host     | member_port | member_state | member_role |
+--------------------------------------+-----------------+-------------+--------------+-------------+
| 331664a5-ec72-11e8-a6f0-005056ab74f8 | node05.test.com |       33063 | ONLINE       | primary     |
| 0ea53bea-ec72-11e8-913c-005056ab74f8 | node05.test.com |       33062 | ONLINE       | secondary   |
| 54f7be9e-ec72-11e8-ba6c-005056ab74f8 | node05.test.com |       33064 | ONLINE       | secondary   |
| 779b4473-ec72-11e8-8f08-005056ab74f8 | node05.test.com |       33065 | ONLINE       | secondary   |
| ee039eb5-ec71-11e8-bd33-005056ab74f8 | node05.test.com |       33061 | ONLINE       | secondary   |
+--------------------------------------+-----------------+-------------+--------------+-------------+
5 rows in set (0.00 sec)

mysql> create database dbtest;
Query OK, 1 row affected (0.16 sec)

mysql> create table dbtest.t2(id int(4)primary key not null auto_increment,nums int(20) not null);
Query OK, 0 rows affected (0.17 sec)

mysql> insert into dbtest.t2(nums) values(1),(2),(3),(4),(5);
Query OK, 5 rows affected (0.05 sec)
Records: 5  Duplicates: 0  Warnings: 0

mysql> update dbtest.t2 set nums=100 where id =3;  --id自增为7，这条语句执行没结果
Query OK, 0 rows affected (0.00 sec)
Rows matched: 0  Changed: 0  Warnings: 0

mysql> delete from dbtest.t2 where id =4;   --id自增为7，这条语句执行没结果
Query OK, 0 rows affected (0.00 sec)

mysql> select * from dbtest.t2;
+----+------+
| id | nums |
+----+------+
|  7 |    1 | --group_replication_auto_increment_increment=7的缘故， --id自增为7
| 14 |    2 |
| 21 |    3 |
| 28 |    4 |
| 35 |    5 |
+----+------+
5 rows in set (0.00 sec)

mysql> create database test;
Query OK, 1 row affected (0.09 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| dbtest             |
| mysql              |
| performance_schema |
| sys                |
| test               |
+--------------------+
6 rows in set (0.00 sec)

mysql>

三、Consul测试

1、MGR（多主模式）+ Consul模式

1.1 、Consul UI界面

地址：http://192.168.49.181:8500/ui/

检查到3个服务，consul 、mysql_3306_w、mysql_3306_r

consul

mysql_3306_r

mysql_3306_w

1.2、Consul 检查DNS解析

域名转发

域名转发官方说明

这里用Dnsmasq来做域名转发（访问MGR的客户端），域名： mysql_3306_w.service.gczheng

[root@node05 consul.d]# echo "server=/gczheng/127.0.0.1#53" > /etc/dnsmasq.d/10-consul

[root@node05 consul.d]# service dnsmasq restart
Redirecting to /bin/systemctl restart dnsmasq.service

[root@node05 consul.d]# cat /etc/resolv.conf 
# Generated by NetworkManager
#nameserver 192.168.10.247
nameserver 127.0.0.1

[root@node05 consul.d]# consul reload
Configuration reload triggered

[root@node05 consul.d]# service dnsmasq restart
Redirecting to /bin/systemctl restart dnsmasq.service

[root@node05 consul.d]# ping  mysql_3306_w.service.gczheng
PING mysql_3306_w.service.gczheng (192.168.222.173) 56(84) bytes of data.
64 bytes from node03.test.com (192.168.222.173): icmp_seq=1 ttl=64 time=0.283 ms --测试ok
64 bytes from node03.test.com (192.168.222.173): icmp_seq=2 ttl=64 time=0.266 ms
64 bytes from node03.test.com (192.168.222.173): icmp_seq=3 ttl=64 time=0.274 ms

dig解析域名 mysql_3306_w.service.gczheng

[root@node11 ~]# dig @127.0.0.1 -p 53 mysql_3306_w.service.gczheng ANY

; <<>> DiG 9.9.4-RedHat-9.9.4-51.el7_4.2 <<>> @127.0.0.1 -p 53 mysql_3306_w.service.gczheng ANY
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7004
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 8, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;mysql_3306_w.service.gczheng.  IN  ANY

;; ANSWER SECTION:
mysql_3306_w.service.gczheng. 0 IN  A 192.168.222.174
mysql_3306_w.service.gczheng. 0 IN  TXT "consul-network-segment="
mysql_3306_w.service.gczheng. 0 IN  A 192.168.222.172
mysql_3306_w.service.gczheng. 0 IN  TXT "consul-network-segment="
mysql_3306_w.service.gczheng. 0 IN  A 192.168.222.173
mysql_3306_w.service.gczheng. 0 IN  TXT "consul-network-segment="
mysql_3306_w.service.gczheng. 0 IN  A 192.168.222.171
mysql_3306_w.service.gczheng. 0 IN  TXT "consul-network-segment="

;; Query time: 12 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed Dec 05 09:32:20 CST 2018
;; MSG SIZE  rcvd: 265
[root@node11 ~]# 

[root@node11 ~]# dig @127.0.0.1 -p 53 mysql_3306_w.service.gczheng SRV

; <<>> DiG 9.9.4-RedHat-9.9.4-51.el7_4.2 <<>> @127.0.0.1 -p 53 mysql_3306_w.service.gczheng SRV
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 450
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 9

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;mysql_3306_w.service.gczheng.  IN  SRV

;; ANSWER SECTION:
mysql_3306_w.service.gczheng. 0 IN  SRV 1 1 3306 node04.test.com.node.dc1.gczheng.
mysql_3306_w.service.gczheng. 0 IN  SRV 1 1 3306 node03.test.com.node.dc1.gczheng.
mysql_3306_w.service.gczheng. 0 IN  SRV 1 1 3306 node01.test.com.node.dc1.gczheng.
mysql_3306_w.service.gczheng. 0 IN  SRV 1 1 3306 node02.test.com.node.dc1.gczheng.

;; ADDITIONAL SECTION:
node04.test.com.node.dc1.gczheng. 0 IN  A 192.168.222.174
node04.test.com.node.dc1.gczheng. 0 IN  TXT "consul-network-segment="
node03.test.com.node.dc1.gczheng. 0 IN  A 192.168.222.173
node03.test.com.node.dc1.gczheng. 0 IN  TXT "consul-network-segment="
node01.test.com.node.dc1.gczheng. 0 IN  A 192.168.222.171
node01.test.com.node.dc1.gczheng. 0 IN  TXT "consul-network-segment="
node02.test.com.node.dc1.gczheng. 0 IN  A 192.168.222.172
node02.test.com.node.dc1.gczheng. 0 IN  TXT "consul-network-segment="

;; Query time: 228 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed Dec 05 09:32:11 CST 2018
;; MSG SIZE  rcvd: 473

[root@node11 ~]# ping  mysql_3306_w.service.gczheng 
PING mysql_3306_w.service.gczheng (192.168.222.171) 56(84) bytes of data.
64 bytes from node01.test.com (192.168.222.171): icmp_seq=1 ttl=64 time=0.174 ms
64 bytes from node01.test.com (192.168.222.171): icmp_seq=2 ttl=64 time=0.373 ms

[root@node11 ~]# ping  mysql_3306_w.service.gczheng 
PING mysql_3306_w.service.gczheng (192.168.222.172) 56(84) bytes of data.
64 bytes from node02.test.com (192.168.222.172): icmp_seq=1 ttl=64 time=0.258 ms
64 bytes from node02.test.com (192.168.222.172): icmp_seq=2 ttl=64 time=0.251 ms

[root@node11 ~]#  ping  mysql_3306_w.service.gczheng 
PING mysql_3306_w.service.gczheng (192.168.222.173) 56(84) bytes of data.
64 bytes from node03.test.com (192.168.222.173): icmp_seq=1 ttl=64 time=0.184 ms
64 bytes from node03.test.com (192.168.222.173): icmp_seq=2 ttl=64 time=0.189 ms

[root@node11 ~]#  ping  mysql_3306_w.service.gczheng 
PING mysql_3306_w.service.gczheng (192.168.222.174) 56(84) bytes of data.
64 bytes from node04.test.com (192.168.222.174): icmp_seq=1 ttl=64 time=0.576 ms
64 bytes from node04.test.com (192.168.222.174): icmp_seq=2 ttl=64 time=1.03 ms

[root@node11 ~]# mysql -uxxxx -pxxxx  -h'mysql_3306_w.service.gczheng' -P3306
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 12730
Server version: 5.7.18-log MySQL Community Server (GPL)
Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

mysql> exit
Bye

1.3、切换测试

1、关闭node04节点

[root@node04 consul.d]# mysqladmin -uroot -p  -P3306 shutdown
Enter password: 
[root@node04 consul.d]#

查看mgr状态

mysql>  SELECT member_id,member_host,member_port,member_state,IF (global_status.variable_name IS NOT NULL,'primary','secondary') AS member_role FROM PERFORMANCE_SCHEMA.replication_group_members LEFT JOIN PERFORMANCE_SCHEMA.global_status ON global_status.variable_name='group_replication_primary_member' AND global_status.variable_value=replication_group_members.member_id;
+--------------------------------------+-----------------+-------------+--------------+-------------+
| member_id                            | member_host     | member_port | member_state | member_role |
+--------------------------------------+-----------------+-------------+--------------+-------------+
| 8770cc17-ebdb-11e8-981b-005056ab9fa5 | node01.test.com |        3306 | ONLINE       | secondary   | --剩下三个节点
| c38416c3-ebd4-11e8-9b2c-005056aba7b5 | node03.test.com |        3306 | ONLINE       | secondary   |
| e5dba457-f6d5-11e8-97ca-005056abaf95 | node02.test.com |        3306 | ONLINE       | secondary   |
+--------------------------------------+-----------------+-------------+--------------+-------------+
3 rows in set (0.00 sec)

mysql>

查看consul 状态

解析域名（mysql_3306_w）

[root@node11 ~]# dig @127.0.0.1 -p 53 mysql_3306_w.service.gczheng SRV

; <<>> DiG 9.9.4-RedHat-9.9.4-51.el7_4.2 <<>> @127.0.0.1 -p 53 mysql_3306_w.service.gczheng SRV
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 19419
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 7

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;mysql_3306_w.service.gczheng.  IN  SRV

;; ANSWER SECTION:
mysql_3306_w.service.gczheng. 0 IN  SRV 1 1 3306 node01.test.com.node.dc1.gczheng. --三个节点
mysql_3306_w.service.gczheng. 0 IN  SRV 1 1 3306 node02.test.com.node.dc1.gczheng.
mysql_3306_w.service.gczheng. 0 IN  SRV 1 1 3306 node03.test.com.node.dc1.gczheng.

;; ADDITIONAL SECTION:
node01.test.com.node.dc1.gczheng. 0 IN  A 192.168.222.171
node01.test.com.node.dc1.gczheng. 0 IN  TXT "consul-network-segment="
node02.test.com.node.dc1.gczheng. 0 IN  A 192.168.222.172
node02.test.com.node.dc1.gczheng. 0 IN  TXT "consul-network-segment="
node03.test.com.node.dc1.gczheng. 0 IN  A 192.168.222.173
node03.test.com.node.dc1.gczheng. 0 IN  TXT "consul-network-segment="

;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed Dec 05 11:47:15 CST 2018
;; MSG SIZE  rcvd: 369

[root@node11 ~]#

Consul 界面查看

mysql_3306_w服务，剩下三个写服务（node01、node02、node03）

2、恢复node04节点

如果mysql故障无法写的情况，先把consul服务停止，在启动mysql服务加入MGR集群，最后启动consul服务

--注释掉服务
[root@node04 consul.d]# consul services deregister mysql_mgr_read_3306.json  
Deregistered service: mysql_read
[root@node04 consul.d]# consul services deregister mysql_mgr_write_3306.json
Deregistered service: mysql_write

[root@node04 consul.d]# systemctl start mysql
[root@node04 consul.d]# mysql -uroot -piforgot
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 4
Server version: 5.7.18-log MySQL Community Server (GPL)

Copyright (c) 2009-2017 Percona LLC and/or its affiliates
Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

(root@localhost) 11:58:08 [(none)]> SELECT * FROM performance_schema.replication_group_members;
+---------------------------+-----------+-------------+-------------+--------------+
| CHANNEL_NAME              | MEMBER_ID | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE |
+---------------------------+-----------+-------------+-------------+--------------+
| group_replication_applier |           |             |        NULL | OFFLINE      |
+---------------------------+-----------+-------------+-------------+--------------+
1 row in set (0.00 sec)

(root@localhost) 11:58:23 [(none)]> start  group_replication; --重新加入集群
Query OK, 0 rows affected (2.63 sec)

(root@localhost) 11:58:35 [(none)]> SELECT * FROM performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-----------------+-------------+--------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST     | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-----------------+-------------+--------------+
| group_replication_applier | 30955199-ebdc-11e8-ac1f-005056ab820e | node04.test.com |        3306 | ONLINE       |
| group_replication_applier | 8770cc17-ebdb-11e8-981b-005056ab9fa5 | node01.test.com |        3306 | ONLINE       |
| group_replication_applier | c38416c3-ebd4-11e8-9b2c-005056aba7b5 | node03.test.com |        3306 | ONLINE       |
| group_replication_applier | e5dba457-f6d5-11e8-97ca-005056abaf95 | node02.test.com |        3306 | ONLINE       |
+---------------------------+--------------------------------------+-----------------+-------------+--------------+
4 rows in set (0.00 sec)

(root@localhost) 11:58:40 [(none)]> exit
Bye
[root@node04 consul.d]# consul reload  --重新读取配置
Configuration reload triggered
[root@node04 consul.d]#

mysql_3306_w服务

查看consul 状态

解析域名（mysql_3306_w）

[root@node11 ~]# dig @127.0.0.1 -p 53 mysql_3306_w.service.gczheng SRV

; <<>> DiG 9.9.4-RedHat-9.9.4-51.el7_4.2 <<>> @127.0.0.1 -p 53 mysql_3306_w.service.gczheng SRV
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 11299
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 9

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;mysql_3306_w.service.gczheng.  IN  SRV

;; ANSWER SECTION:
mysql_3306_w.service.gczheng. 0 IN  SRV 1 1 3306 node02.test.com.node.dc1.gczheng.
mysql_3306_w.service.gczheng. 0 IN  SRV 1 1 3306 node01.test.com.node.dc1.gczheng.
mysql_3306_w.service.gczheng. 0 IN  SRV 1 1 3306 node03.test.com.node.dc1.gczheng.
mysql_3306_w.service.gczheng. 0 IN  SRV 1 1 3306 node04.test.com.node.dc1.gczheng.

;; ADDITIONAL SECTION:
node02.test.com.node.dc1.gczheng. 0 IN  A 192.168.222.172
node02.test.com.node.dc1.gczheng. 0 IN  TXT "consul-network-segment="
node01.test.com.node.dc1.gczheng. 0 IN  A 192.168.222.171
node01.test.com.node.dc1.gczheng. 0 IN  TXT "consul-network-segment="
node03.test.com.node.dc1.gczheng. 0 IN  A 192.168.222.173
node03.test.com.node.dc1.gczheng. 0 IN  TXT "consul-network-segment="
node04.test.com.node.dc1.gczheng. 0 IN  A 192.168.222.174
node04.test.com.node.dc1.gczheng. 0 IN  TXT "consul-network-segment="

;; Query time: 9 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed Dec 05 11:48:51 CST 2018
;; MSG SIZE  rcvd: 473

[root@node11 ~]#

2、MGR（单主模式）+ Consul模式 + PorxySQL

2.1、PorxySQL配置

安装配置步骤
- 安装请自行参考官方文档安装指南
- 修改proxysql.cnf 配置文件，配置后端mysql连接
- 修改proxysql.json配置文件
- 启动consul服务读取proxysql.json配置
- 配置域名转发（访问proxysql的客户端），指向consul服务器

[root@audit01 consul.d]# egrep -v "^#|^$" /etc/proxysql.cnf 
datadir="/var/lib/proxysql"
admin_variables=
{
  admin_credentials="admin:admin"  #更改账号
  mysql_ifaces="127.0.0.1:6032;/tmp/proxysql_admin.sock"  #限制本地访问
}
mysql_variables=
{
  threads=4
  max_connections=2048
  default_query_delay=0
  default_query_timeout=36000000
  have_compress=true
  poll_timeout=2000
  interfaces="0.0.0.0:6033"   
  default_schema="information_schema"
  stacksize=1048576
  server_version="5.5.30"
  connect_timeout_server=3000
  monitor_username="rpl_user"    #后端mysql监控账号
  monitor_password="rpl_pass"    #后端mysql监控密码
  monitor_history=600000
  monitor_connect_interval=60000
  monitor_ping_interval=10000
  monitor_read_only_interval=1500
  monitor_read_only_timeout=500
  ping_interval_server_msec=120000
  ping_timeout_server=500
  commands_stats=true
  sessions_sort=true
  connect_retries_on_failure=10
}
mysql_servers =
(
)
mysql_users:
(
)
mysql_query_rules:
(
)
scheduler=
(
)
mysql_replication_hostgroups=
(
)
[root@audit01 consul.d]# 

[root@audit01 consul.d]# service proxysql restart
Shutting down ProxySQL: DONE!
Starting ProxySQL: 2018-12-05 17:58:53 [INFO] Using config file /etc/proxysql.cnf
DONE!
[root@audit01 consul.d]# service proxysql status
ProxySQL is running (3408).
[root@audit01 consul.d]#

配置后端mysql

登录管理端（mysql -P6032 -h127.0.0.1 -uadmin -padmin）配置后端mysql（audit01,node12）

INSERT INTO mysql_replication_hostgroups VALUES (20,21,'Standard Replication Groups');
INSERT INTO mysql_servers (hostname,hostgroup_id,port,weight) VALUES ('192.168.222.175',21,33061,1000),('192.168.222.175',21,33062,1000),('192.168.222.175',21,33063,1000),('192.168.222.175',21,33064,1000),('192.168.222.175',21,33065,1000);
LOAD MYSQL SERVERS TO RUNTIME; SAVE MYSQL SERVERS TO DISK;

INSERT INTO mysql_query_rules (active, match_pattern, destination_hostgroup, cache_ttl, apply) VALUES (1, '^SELECT .* FOR UPDATE', 20, NULL, 1);
INSERT INTO mysql_query_rules (active, match_pattern, destination_hostgroup, cache_ttl, apply) VALUES (1, '^SELECT .*', 21, NULL, 1);
LOAD MYSQL QUERY RULES TO RUNTIME; SAVE MYSQL QUERY RULES TO DISK;

INSERT INTO mysql_users (username,password,active,default_hostgroup,default_schema) VALUES ('gcdb','iforgot',1,20,'test');
LOAD MYSQL USERS TO RUNTIME; SAVE MYSQL USERS TO DISK;

use monitor;
UPDATE global_variables SET variable_value='rpl_user' WHERE variable_name='mysql-monitor_username';
UPDATE global_variables SET variable_value='rpl_pass' WHERE variable_name='mysql-monitor_password';
LOAD MYSQL VARIABLES TO RUNTIME; SAVE MYSQL VARIABLES TO DISK;

select * from mysql_servers;
select * from mysql_query_rules;
select * from mysql_users;
select * from global_variables where variable_name like "mysql-monitor%";

确认配置没问题，两个主机启动consul

[root@audit01 consul.d]# pwd
/etc/consul.d
[root@audit01 consul.d]# ll
total 8
-rw-r--r-- 1 root root 237 Dec  5 14:59 client.json
-rw-r--r-- 1 root root 542 Dec  5 16:48 proxysql.json
drwxr-xr-x 2 root root   6 Dec  5 14:57 scripts

#由于consul是通过ansible启动，这里就确认是否已启动
[root@audit01 consul.d]# ps -ef|grep consul |grep -v grep 
root      1636     1  0 15:00 ?        00:00:49 consul agent -config-dir=/etc/consul.d

[root@audit01 consul.d]# consul catalog nodes
Node              ID        Address          DC
audit01.test.com  8f638db7  192.168.222.199  dc1  --node节点已经加入
node01.test.com   feb4c253  192.168.222.171  dc1
node02.test.com   2993cd81  192.168.222.172  dc1
node03.test.com   305293a0  192.168.222.173  dc1
node04.test.com   06c47aea  192.168.222.174  dc1
node05.test.com   c8e917fb  192.168.222.175  dc1
node06.test.com   0bd03c71  192.168.222.176  dc1
node09.test.com   fcca17ba  192.168.222.179  dc1
node10.test.com   c95847a4  192.168.222.180  dc1
node11.test.com   8d8f6757  192.168.222.181  dc1
node12.test.com   3a0f5fdd  192.168.222.182  dc1  --node节点已经加入

[root@audit01 consul.d]# consul catalog services
consul
mysql_3306_r
mysql_3306_w
proxysql   --可以看到服务已经加入，在页面也可以到
[root@audit01 consul.d]#

2.2 、查看页面

显示是四个心跳节点

2.3、检查DNS解析

配置DNS转发的客户端找一台测试

[root@node05 consul.d]# dig @127.0.0.1 -p 53 proxysql.service.gczheng SRV

; <<>> DiG 9.9.4-RedHat-9.9.4-61.el7_5.1 <<>> @127.0.0.1 -p 53 proxysql.service.gczheng SRV
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4960
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 9

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;proxysql.service.gczheng.  IN  SRV

;; ANSWER SECTION:
proxysql.service.gczheng. 0 IN  SRV 1 1 6033 c0a8dec7.addr.dc1.gczheng.
proxysql.service.gczheng. 0 IN  SRV 1 1 6033 audit01.test.com.node.dc1.gczheng.
proxysql.service.gczheng. 0 IN  SRV 1 1 6033 c0a8deb6.addr.dc1.gczheng.
proxysql.service.gczheng. 0 IN  SRV 1 1 6033 node12.test.com.node.dc1.gczheng.

;; ADDITIONAL SECTION:
c0a8dec7.addr.dc1.gczheng. 0  IN  A 192.168.222.199
node12.test.com.node.dc1.gczheng. 0 IN  TXT "consul-network-segment="
audit01.test.com.node.dc1.gczheng. 0 IN A 192.168.222.199
audit01.test.com.node.dc1.gczheng. 0 IN TXT "consul-network-segment="
c0a8deb6.addr.dc1.gczheng. 0  IN  A 192.168.222.182
audit01.test.com.node.dc1.gczheng. 0 IN TXT "consul-network-segment="
node12.test.com.node.dc1.gczheng. 0 IN  A 192.168.222.182
node12.test.com.node.dc1.gczheng. 0 IN  TXT "consul-network-segment="

;; Query time: 3 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed Dec 05 18:14:41 CST 2018
;; MSG SIZE  rcvd: 456

[root@node05 consul.d]# ping proxysql.service.gczheng
PING proxysql.service.gczheng (192.168.222.182) 56(84) bytes of data.
64 bytes from node12.test.com (192.168.222.182): icmp_seq=1 ttl=64 time=0.221 ms
64 bytes from node12.test.com (192.168.222.182): icmp_seq=2 ttl=64 time=0.282 ms

2.4、切换测试

1、测试proxysql负载均衡

[root@node05 consul.d]# mysql -ugcdb -piforgot -P6033 -hproxysql.service.gczheng -e "select @@port as 端口"
mysql: [Warning] Using a password on the command line interface can be insecure.
+--------+
| 端口   |
+--------+
|  33061 | --根据延时随机连接后端mysql
+--------+
[root@node05 consul.d]# mysql -ugcdb -piforgot -P6033 -hproxysql.service.gczheng -e "select @@port as 端口"
mysql: [Warning] Using a password on the command line interface can be insecure.
+--------+
| 端口   |
+--------+
|  33062 |
+--------+
[root@node05 consul.d]# mysql -ugcdb -piforgot -P6033 -hproxysql.service.gczheng -e "select @@port as 端口"
mysql: [Warning] Using a password on the command line interface can be insecure.
+--------+
| 端口   |
+--------+
|  33064 |
+--------+
[root@node05 consul.d]#  mysql -ugcdb -piforgot -P6033 -hproxysql.service.gczheng -e "select @@port as 端口"
mysql: [Warning] Using a password on the command line interface can be insecure.
+--------+
| 端口   |
+--------+
|  33065 |
+--------+
[root@node05 consul.d]#  mysql -ugcdb -piforgot -P6033 -hproxysql.service.gczheng -e "select @@port as 端口"
mysql: [Warning] Using a password on the command line interface can be insecure.
+--------+
| 端口   |
+--------+
|  33063 |
+--------+

2、测试proxysql宕机或者roxysql 服务不可用

[root@node05 mgr_scripts]# dig @127.0.0.1 -p 53 proxysql.service.gczheng 

; <<>> DiG 9.9.4-RedHat-9.9.4-61.el7_5.1 <<>> @127.0.0.1 -p 53 proxysql.service.gczheng
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10214
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 3

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;proxysql.service.gczheng.  IN  A

;; ANSWER SECTION:
proxysql.service.gczheng. 0 IN  A 192.168.222.199
proxysql.service.gczheng. 0 IN  A 192.168.222.182

;; ADDITIONAL SECTION:
proxysql.service.gczheng. 0 IN  TXT "consul-network-segment="
proxysql.service.gczheng. 0 IN  TXT "consul-network-segment="

;; Query time: 1 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu Dec 06 14:19:18 CST 2018
;; MSG SIZE  rcvd: 157

[root@node05 mgr_scripts]#

node12 ifdown ens224网口

[root@node12 ~]# ifconfig ens224
ens224: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.222.182  netmask 255.255.255.0  broadcast 192.168.222.255
        inet6 fe80::250:56ff:feab:bc9d  prefixlen 64  scopeid 0x20<link>
        ether 00:50:56:ab:bc:9d  txqueuelen 1000  (Ethernet)
        RX packets 1059557  bytes 178058970 (169.8 MiB)
        RX errors 0  dropped 57  overruns 0  frame 0
        TX packets 1022717  bytes 534301681 (509.5 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root@node12 ~]# ifdown ens224
Device 'ens224' successfully disconnected.
[root@node12 ~]#

audit日志显示如下

[root@audit01 consul.d]#  tail -f /data/consul/consul.log 

2018/12/06 16:40:41 [INFO] agent: Synced service "proxy"
2018/12/06 16:40:41 [INFO] agent: Synced service "proxy1"
2018/12/06 16:40:41 [INFO] agent: Synced service "proxy2"
2018/12/06 16:40:45 [INFO] agent: Synced check "mysql_proxy_02"
2018/12/06 16:40:50 [INFO] agent: Synced check "mysql_proxy_01"
2018/12/06 16:42:43 [INFO] memberlist: Marking node12.test.com as failed, suspect timeout reached (2 peer confirmations)
2018/12/06 16:42:43 [INFO] serf: EventMemberFailed: node12.test.com 192.168.222.182
2018/12/06 16:42:46 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:42:46 [INFO] agent: Synced check "mysql_proxy_02"
2018/12/06 16:43:02 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:43:18 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:43:34 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:43:50 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:44:06 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:44:22 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:44:38 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:44:54 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:45:10 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:45:26 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:45:42 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:45:58 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:46:14 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:46:30 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:46:46 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:47:02 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:47:18 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:47:34 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:47:50 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:48:06 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:48:22 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:48:38 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:48:54 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:49:10 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:49:11 [INFO] serf: attempting reconnect to node12.test.com 192.168.222.182:8301
2018/12/06 16:49:26 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:49:42 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:49:58 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:50:14 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:50:30 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:50:46 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:51:02 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:51:18 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:51:34 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:51:42 [INFO] serf: attempting reconnect to node12.test.com 192.168.222.182:8301
2018/12/06 16:51:50 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:52:06 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:52:22 [WARN] agent: Check "mysql_proxy_02": Timed out (1s) running check
2018/12/06 16:52:24 [INFO] serf: EventMemberJoin: node12.test.com 192.168.222.182
2018/12/06 16:52:30 [INFO] agent: Caught signal:  hangup
2018/12/06 16:52:30 [INFO] agent: Reloading configuration...
2018/12/06 16:52:30 [INFO] agent: Deregistered service "proxy"
2018/12/06 16:52:30 [INFO] agent: Synced service "proxy1"
2018/12/06 16:52:30 [INFO] agent: Synced service "proxy2"
2018/12/06 16:52:30 [INFO] agent: Deregistered check "mysql_proxy_02"
2018/12/06 16:52:30 [INFO] agent: Deregistered check "mysql_proxy_01"
2018/12/06 16:52:33 [INFO] agent: Synced check "service:proxy2"
2018/12/06 16:54:00 [INFO] agent: Caught signal:  hangup
2018/12/06 16:54:00 [INFO] agent: Reloading configuration...
2018/12/06 16:54:00 [INFO] agent: Synced service "proxy2"
2018/12/06 16:54:00 [INFO] agent: Synced service "proxy1"
2018/12/06 16:55:26 [INFO] memberlist: Suspect node12.test.com has failed, no acks received
2018/12/06 16:55:30 [INFO] memberlist: Marking node12.test.com as failed, suspect timeout reached (2 peer confirmations)
2018/12/06 16:55:30 [INFO] serf: EventMemberFailed: node12.test.com 192.168.222.182
2018/12/06 16:55:58 [WARN] agent: Check "service:proxy2": Timed out (30s) running check
2018/12/06 16:55:58 [INFO] agent: Synced check "service:proxy2"
2018/12/06 16:56:21 [WARN] agent: Check "service:proxy2" is now critical
2018/12/06 16:56:29 [WARN] agent: Check "service:proxy2" is now critical
2018/12/06 16:56:37 [WARN] agent: Check "service:proxy2" is now critical
2018/12/06 16:56:45 [WARN] agent: Check "service:proxy2" is now critical
2018/12/06 16:56:53 [WARN] agent: Check "service:proxy2" is now critical
2018/12/06 16:57:01 [WARN] agent: Check "service:proxy2" is now critical
2018/12/06 16:57:09 [WARN] agent: Check "service:proxy2" is now critical
2018/12/06 16:57:17 [WARN] agent: Check "service:proxy2" is now critical
2018/12/06 16:57:25 [WARN] agent: Check "service:proxy2" is now critical
2018/12/06 16:57:33 [WARN] agent: Check "service:proxy2" is now critical

域名解析

[root@node05 consul.d]# dig @127.0.0.1 -p 53 proxysql.service.gczheng

; <<>> DiG 9.9.4-RedHat-9.9.4-61.el7_5.1 <<>> @127.0.0.1 -p 53 proxysql.service.gczheng
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 53883
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 3

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;proxysql.service.gczheng.  IN  A

;; ANSWER SECTION:
proxysql.service.gczheng. 0 IN  A 192.168.222.182  --199和182主机应答
proxysql.service.gczheng. 0 IN  A 192.168.222.199

;; ADDITIONAL SECTION:
proxysql.service.gczheng. 0 IN  TXT "consul-network-segment="
proxysql.service.gczheng. 0 IN  TXT "consul-network-segment="

;; Query time: 1 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu Dec 06 16:55:03 CST 2018
;; MSG SIZE  rcvd: 157

[root@node05 consul.d]# dig @127.0.0.1 -p 53 proxysql.service.gczheng

; <<>> DiG 9.9.4-RedHat-9.9.4-61.el7_5.1 <<>> @127.0.0.1 -p 53 proxysql.service.gczheng
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 37713
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 2

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;proxysql.service.gczheng.  IN  A

;; ANSWER SECTION:
proxysql.service.gczheng. 0 IN  A 192.168.222.199   --只有199 应答

;; ADDITIONAL SECTION:
proxysql.service.gczheng. 0 IN  TXT "consul-network-segment="

;; Query time: 1 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu Dec 06 16:56:16 CST 2018
;; MSG SIZE  rcvd: 105

ping

[root@node05 ~]#  ping proxysql.service.gczheng
PING proxysql.service.gczheng (192.168.222.182) 56(84) bytes of data.
64 bytes from node12.test.com (192.168.222.182): icmp_seq=1 ttl=64 time=0.197 ms
64 bytes from node12.test.com (192.168.222.182): icmp_seq=2 ttl=64 time=0.291 ms
64 bytes from node12.test.com (192.168.222.182): icmp_seq=3 ttl=64 time=0.288 ms
64 bytes from node12.test.com (192.168.222.182): icmp_seq=4 ttl=64 time=0.235 ms
64 bytes from node12.test.com (192.168.222.182): icmp_seq=5 ttl=64 time=0.261 ms
64 bytes from node12.test.com (192.168.222.182): icmp_seq=6 ttl=64 time=0.313 ms
64 bytes from node12.test.com (192.168.222.182): icmp_seq=7 ttl=64 time=0.283 ms
64 bytes from node12.test.com (192.168.222.182): icmp_seq=8 ttl=64 time=0.337 ms
64 bytes from node12.test.com (192.168.222.182): icmp_seq=9 ttl=64 time=0.141 ms
64 bytes from node12.test.com (192.168.222.182): icmp_seq=10 ttl=64 time=0.337 ms
64 bytes from node12.test.com (192.168.222.182): icmp_seq=11 ttl=64 time=0.273 ms
64 bytes from node12.test.com (192.168.222.182): icmp_seq=12 ttl=64 time=0.258 ms
From node05.test.com (192.168.222.175) icmp_seq=60 Destination Host Unreachable
From node05.test.com (192.168.222.175) icmp_seq=61 Destination Host Unreachable
From node05.test.com (192.168.222.175) icmp_seq=62 Destination Host Unreachable
From node05.test.com (192.168.222.175) icmp_seq=63 Destination Host Unreachable
From node05.test.com (192.168.222.175) icmp_seq=64 Destination Host Unreachable
From node05.test.com (192.168.222.175) icmp_seq=65 Destination Host Unreachable
From node05.test.com (192.168.222.175) icmp_seq=66 Destination Host Unreachable
From node05.test.com (192.168.222.175) icmp_seq=67 Destination Host Unreachable
From node05.test.com (192.168.222.175) icmp_seq=68 Destination Host Unreachable
From node05.test.com (192.168.222.175) icmp_seq=69 Destination Host Unreachable
From node05.test.com (192.168.222.175) icmp_seq=70 Destination Host Unreachable
From node05.test.com (192.168.222.175) icmp_seq=71 Destination Host Unreachable
^C
--- proxysql.service.gczheng ping statistics ---
72 packets transmitted, 12 received, +12 errors, 83% packet loss, time 71004ms
rtt min/avg/max/mdev = 0.141/0.267/0.337/0.058 ms, pipe 4
[root@node05 ~]#  ping proxysql.service.gczheng   --重新连接后跳到199
PING proxysql.service.gczheng (192.168.222.199) 56(84) bytes of data.
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=1 ttl=64 time=0.233 ms
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=2 ttl=64 time=0.220 ms
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=3 ttl=64 time=0.259 ms
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=4 ttl=64 time=0.249 ms
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=5 ttl=64 time=0.254 ms

node12 ifup ens224网口

[root@node12 consul.d]# ifup ens224
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/7)

域名解析

等待5s时间，域名解析到182

[root@node05 consul.d]# dig @127.0.0.1 -p 53 proxysql.service.gczheng

; <<>> DiG 9.9.4-RedHat-9.9.4-61.el7_5.1 <<>> @127.0.0.1 -p 53 proxysql.service.gczheng
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29882
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 2

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;proxysql.service.gczheng.  IN  A

;; ANSWER SECTION:
proxysql.service.gczheng. 0 IN  A 192.168.222.199

;; ADDITIONAL SECTION:
proxysql.service.gczheng. 0 IN  TXT "consul-network-segment="

;; Query time: 1 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu Dec 06 17:04:33 CST 2018
;; MSG SIZE  rcvd: 105

[root@node05 consul.d]# dig @127.0.0.1 -p 53 proxysql.service.gczheng

; <<>> DiG 9.9.4-RedHat-9.9.4-61.el7_5.1 <<>> @127.0.0.1 -p 53 proxysql.service.gczheng
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 65219
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 3

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;proxysql.service.gczheng.  IN  A

;; ANSWER SECTION:
proxysql.service.gczheng. 0 IN  A 192.168.222.182
proxysql.service.gczheng. 0 IN  A 192.168.222.199

;; ADDITIONAL SECTION:
proxysql.service.gczheng. 0 IN  TXT "consul-network-segment="
proxysql.service.gczheng. 0 IN  TXT "consul-network-segment="

;; Query time: 1 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu Dec 06 17:04:33 CST 2018
;; MSG SIZE  rcvd: 157

[root@node05 ~]#  ping proxysql.service.gczheng
PING proxysql.service.gczheng (192.168.222.199) 56(84) bytes of data.
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=1 ttl=64 time=0.185 ms
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=2 ttl=64 time=0.285 ms
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=3 ttl=64 time=0.238 ms
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=4 ttl=64 time=0.300 ms
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=5 ttl=64 time=0.285 ms
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=6 ttl=64 time=0.182 ms
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=7 ttl=64 time=0.209 ms
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=8 ttl=64 time=0.271 ms
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=9 ttl=64 time=0.845 ms
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=10 ttl=64 time=0.222 ms
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=11 ttl=64 time=0.251 ms
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=12 ttl=64 time=0.276 ms
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=13 ttl=64 time=0.237 ms
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=14 ttl=64 time=0.266 ms
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=15 ttl=64 time=0.267 ms
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=16 ttl=64 time=0.251 ms
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=17 ttl=64 time=0.162 ms
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=18 ttl=64 time=0.297 ms
64 bytes from 192.168.222.199 (192.168.222.199): icmp_seq=19 ttl=64 time=0.244 ms
^C
--- proxysql.service.gczheng ping statistics ---
19 packets transmitted, 19 received, 0% packet loss, time 18002ms
rtt min/avg/max/mdev = 0.162/0.277/0.845/0.140 ms
[root@node05 ~]#  ping proxysql.service.gczheng
PING proxysql.service.gczheng (192.168.222.182) 56(84) bytes of data.
64 bytes from node12.test.com (192.168.222.182): icmp_seq=1 ttl=64 time=0.227 ms
64 bytes from node12.test.com (192.168.222.182): icmp_seq=2 ttl=64 time=0.320 ms

3、注意事项

恢复节点：

需要确认是否只是mysql节点故障，还是整个节点故障，避免consul服务恢复，mysql节点未加入集群的情况。

域名解析：

客户端节点做本地域名解析时要指向三个服务器节点

查看全文

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原文地址：https://www.cnblogs.com/gczheng/p/10078311.html