2.kubernetes的CNI网络插件-Flannel

目录

• 1.集群架构
  • 1.1.下载软件，解压，做软链接
  • 1.2.创建目录
  • 1.3.拷贝证书文件
  • 1.4.创建配置
  • 1.5.创建启动脚本
  • 1.6.授权和创建日志目录
  • 1.7.创建supervisor配置
• 2.flannel host-gw模型（三选一）
  • 2.1.启动服务并检查
• 3.flannel vxlan模型（三选一）
• 4.flannel 直接路由模型（三选一）
• 5.iptables规则
  • 5.1.优化iptables规则
    • 5.1.1.安装iptables-services并设置开机启动
    • 5.1.2.优化各运算节点的SNAT规则
  • 5.2.保存iptables规则
    • 5.2.1.各运算节点保存iptables规则

1.集群架构

主机名	角色	IP地址
hdss7-21.host.com	flannel	10.4.7.21
hdss7-22.host.com	flannel	10.4.7.22

部署方法以hdss7-21.host.com为例

1.1.下载软件，解压，做软链接

[root@hdss7-21 ~]# cd /opt/src/
[root@hdss7-21 src]# wget https://github.com/coreos/flannel/releases/download/v0.11.0/flannel-v0.11.0-linux-amd64.tar.gz

[root@hdss7-21 src]# mkdir /opt/flannel-v0.11.0
[root@hdss7-21 src]# tar xf flannel-v0.11.0-linux-amd64.tar.gz  -C /opt/flannel-v0.11.0/
[root@hdss7-21 src]# ln -s /opt/flannel-v0.11.0/ /opt/flannel

1.2.创建目录

[root@hdss7-21 src]# /opt/flannel
[root@hdss7-21 flannel]# mkdir /opt/flannel/cert

1.3.拷贝证书文件

[root@hdss7-21 flannel]# cd cert
[root@hdss7-21 cert]# scp hdss7-200:/opt/certs/ca.pem .
[root@hdss7-21 cert]# scp hdss7-200:/opt/certs/client.pem .
[root@hdss7-21 cert]# scp hdss7-200:/opt/certs/client-key.pem .

1.4.创建配置

[root@hdss7-21 cert]# cd ..
[root@hdss7-21 flannel]# vi subnet.env
FLANNEL_NETWORK=172.7.0.0/16
FLANNEL_SUBNET=172.7.21.1/24
FLANNEL_MTU=1500
FLANNEL_IPMASQ=false

1.5.创建启动脚本

[root@hdss7-21 flannel]# vi flanneld.sh
#!/bin/sh
./flanneld 
  --public-ip=10.4.7.21 
  --etcd-endpoints=https://10.4.7.12:2379,https://10.4.7.21:2379,https://10.4.7.22:2379 
  --etcd-keyfile=./cert/client-key.pem 
  --etcd-certfile=./cert/client.pem 
  --etcd-cafile=./cert/ca.pem 
  --iface=eth0 
  --subnet-file=./subnet.env 
  --healthz-port=2401

1.6.授权和创建日志目录

[root@hdss7-21 flannel]# chmod +x flanneld.sh 
[root@hdss7-21 flannel]# mkdir -p /data/logs/flanneld

1.7.创建supervisor配置

[root@hdss7-21 flannel]# vi /etc/supervisord.d/flannel.ini
[program:flanneld-7-21]
command=/opt/flannel/flanneld.sh                             ; the program (relative uses PATH, can take args)
numprocs=1                                                   ; number of processes copies to start (def 1)
directory=/opt/flannel                                       ; directory to cwd to before exec (def no cwd)
autostart=true                                               ; start at supervisord start (default: true)
autorestart=true                                             ; retstart at unexpected quit (default: true)
startsecs=30                                                 ; number of secs prog must stay running (def. 1)
startretries=3                                               ; max # of serial start failures (default 3)
exitcodes=0,2                                                ; 'expected' exit codes for process (default 0,2)
stopsignal=QUIT                                              ; signal used to kill process (default TERM)
stopwaitsecs=10                                              ; max num secs to wait b4 SIGKILL (default 10)
user=root                                                    ; setuid to this UNIX account to run the program
redirect_stderr=true                                         ; redirect proc stderr to stdout (default false)
stdout_logfile=/data/logs/flanneld/flanneld.stdout.log       ; stderr log path, NONE for none; default AUTO
stdout_logfile_maxbytes=64MB                                 ; max # logfile bytes b4 rotation (default 50MB)
stdout_logfile_backups=4                                     ; # of stdout logfile backups (default 10)
stdout_capture_maxbytes=1MB                                  ; number of bytes in 'capturemode' (default 0)
stdout_events_enabled=false                                  ; emit events on stdout writes (default false)

2.flannel host-gw模型（三选一）

[root@hdss7-21 etcd]# ./etcdctl set /coreos.com/network/config '{"Network": "172.7.0.0/16", "Backend": {"Type": "host-gw"}}'
{"Network": "172.7.0.0/16", "Backend": {"Type": "host-gw"}}
验证：
[root@hdss7-21 etcd]# ./etcdctl get /coreos.com/network/config
{"Network": "172.7.0.0/16", "Backend": {"Type": "host-gw"}}

2.1.启动服务并检查

[root@hdss7-21 flannel]# supervisorctl  update
[root@hdss7-21 flannel]# supervisorctl status

3.flannel vxlan模型（三选一）

1.supervisor stop flanneld-7-[21.22]
2.删除host-gw模型创建的路由
route del -net 172.7.21.0/24 gw 10.4.7.21     hdss7-22.host.com上
route del -net 172.7.22.0/24 gw 10.4.7.22     hdss7-21.host.com上
3.在etcd修改
./etcdctl get /coreos.com/network/config
./etcdctl rm /coreos.com/network/config
./etcdctl set /coreos.com/network/config '{"Network": "172.7.0.0/16", "Backend": {"Type": "VxLAN"}}'
4.supervisor start flanneld-7-[21.22]

4.flannel 直接路由模型（三选一）

'{"Network": "172.7.0.0/16", "Backend": {"Type": "VxLAN","Directrouting": true}}'

5.iptables规则

5.1.优化iptables规则

5.1.1.安装iptables-services并设置开机启动

[root@hdss7-21 ~]# yum install iptables-services  -y
[root@hdss7-21 ~]# systemctl start iptables
[root@hdss7-21 ~]# systemctl enable  iptables

5.1.2.优化各运算节点的SNAT规则

[root@hdss7-21 ~]# iptables -t nat -D POSTROUTING -s 172.7.21.0/24 ! -o docker0 -j MASQUERADE
[root@hdss7-21 ~]# iptables -t nat -I POSTROUTING -s 172.7.21.0/24 ! -d 172.7.0.0/16 ! -o docker0 -j MASQUERADE

5.2.保存iptables规则

5.2.1.各运算节点保存iptables规则

service iptables save