目录
1.集群规划
| 主机 | IP | 角色 |
|---|---|---|
| hdss7-12.host.com | 10.4.7.12 | etcd leader |
| hdss7-21.host.com | 10.4.7.21 | etcd follow |
| hdss7-22.host.com | 10.4.7.22 | etcd follow |
2.创建基于根证书的config配置文件
在hdss7-200主机上执行：
cat > /opt/certs/ca-config.json <<'eof'
{
"signing": {
"default": {
"expiry": "175200h"
},
"profiles": {
"server": {
"expiry": "175200h",
"usages": [
"signing",
"key encipherment",
"server auth"
]
},
"client": {
"expiry": "175200h",
"usages": [
"signing",
"key encipherment",
"client auth"
]
},
"peer": {
"expiry": "175200h",
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
]
}
}
}
}
eof
- peer：相互通信，服务端找客户端需要证书，客户端找服务端也需要证书。
- client：客户端跟服务器端需要证书，服务器端找客户端不需要证书。
- server：服务端启动的时候需要证书。
3.创建生成etcd自签证书peer的csr的json配置文件
cat > /opt/certs/etcd-peer-csr.json <<'eof'
{
"CN": "k8s-etcd",
"hosts": [
"10.4.7.11",
"10.4.7.12",
"10.4.7.21",
"10.4.7.22"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "GuangZhou",
"L": "GuangZhou",
"O": "k8s",
"OU": "yw"
}
]
}
eof
hosts字段表示可能安装etcd的服务器主机ip。
4.生成etcd证书文件
cd /opt/certs/
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=peer etcd-peer-csr.json |cfssl-json -bare etcd-peer
[root@hdss7-200 certs]# ll
etcd-peer.csr
etcd-peer-csr.json
etcd-peer-key.pem
etcd-peer.pem
5.创建etcd用户
以下在hdss7-12，hdss7-21，hdss7-22操作
以hdss7-12部署为例：
useradd -s /sbin/nologin -M etcd
6.软件下载解压
下载链接：https://github.com/etcd-io/etcd/releases/tag/v3.1.20
mkdir /opt/src
cd /opt/src
rz ==> etcd-v3.1.20-linux-amd64.tar.gz
tar xf etcd-v3.1.20-linux-amd64.tar.gz -C /opt/
cd /opt
mv etcd-v3.1.20-linux-amd64/ etcd-v3.1.20
ln -s /opt/etcd-v3.1.20/ /opt/etcd
7.拷贝证书
mkdir -p /opt/etcd/certs /data/etcd /data/logs/etcd-server
scp hdss7-200:/opt/certs/ca.pem /opt/etcd/certs/
scp hdss7-200:/opt/certs/etcd-peer.pem /opt/etcd/certs/
scp hdss7-200:/opt/certs/etcd-peer-key.pem /opt/etcd/certs/
8.创建etcd服务启动脚本（注意每台etcd服务器个别配置不一样）
cat > /opt/etcd/etcd-server-startup.sh <<'eof'
#!/bin/sh
./etcd --name etcd-server-7-12 \
--data-dir /data/etcd/etcd-server \
--listen-peer-urls https://10.4.7.12:2380 \
--listen-client-urls https://10.4.7.12:2379,http://127.0.0.1:2379 \
--quota-backend-bytes 8589934592 \
--initial-advertise-peer-urls https://10.4.7.12:2380 \
--advertise-client-urls https://10.4.7.12:2379,http://127.0.0.1:2379 \
--initial-cluster etcd-server-7-12=https://10.4.7.12:2380,etcd-server-7-21=https://10.4.7.21:2380,etcd-server-7-22=https://10.4.7.22:2380 \
--ca-file ./certs/ca.pem \
--cert-file ./certs/etcd-peer.pem \
--key-file ./certs/etcd-peer-key.pem \
--client-cert-auth \
--trusted-ca-file ./certs/ca.pem \
--peer-ca-file ./certs/ca.pem \
--peer-cert-file ./certs/etcd-peer.pem \
--peer-key-file ./certs/etcd-peer-key.pem \
--peer-client-cert-auth \
--peer-trusted-ca-file ./certs/ca.pem \
--log-output stdout
eof
注：不同的地方
--name etcd-server-7-12
--listen-peer-urls https://10.4.7.12:2380
--listen-client-urls https://10.4.7.12:2379,http://127.0.0.1:2379
--initial-advertise-peer-urls https://10.4.7.12:2380
--advertise-client-urls https://10.4.7.12:2379,http://127.0.0.1:2379
参数说明：
--name # 节点名称
--data-dir # 数据目录
--listen-peer-urls # 集群通信监听地址
--listen-client-urls # 客户端访问监听地址
--quota-backend-bytes
--initial-advertise-peer-urls # 集群通告地址
--advertise-client-urls # 客户端通告地址
--initial-cluster # ETCDdb数据大小，默认是2G，当数据达到2G的时候就不允许写入，必须对历史数据进行压缩才能继续写入；参加1里面说的，我们启动的时候就应该提前确定大小，官方推荐是8G，这里我们也使用8G的配置。
9.授权
chmod +x /opt/etcd/etcd-server-startup.sh
chown -R etcd: /opt/etcd-v3.1.20/ /data/etcd/ /data/logs/etcd-server/
10.安装supervisor软件
yum install supervisor -y
systemctl start supervisord
systemctl enable supervisord
11.配置supervisor（注意每台etcd服务器个别配置不一样）
cat > /etc/supervisord.d/etcd-server.ini <<'eof'
[program:etcd-server-7-12]
command=/opt/etcd/etcd-server-startup.sh ; the program (relative uses PATH, can take args)
numprocs=1 ; number of processes copies to start (def 1)
directory=/opt/etcd ; 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=etcd ; setuid to this UNIX account to run the program
redirect_stderr=true ; redirect proc stderr to stdout (default false)
stdout_logfile=/data/logs/etcd-server/etcd.stdout.log ; stdout 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)
eof
注：不同的地方
[program:etcd-server-7-12]
12.启动etcd服务并检查
supervisorctl update
supervisorctl status
netstat -lntup|grep etcd
tcp 0 0 10.4.7.12:2379 0.0.0.0:* LISTEN 11225/./etcd
tcp 0 0 127.0.0.1:2379 0.0.0.0:* LISTEN 11225/./etcd
tcp 0 0 10.4.7.12:2380 0.0.0.0:* LISTEN 11225/./etcd
13.检查集群状态
[root@hdss7-21 etcd]# /opt/etcd/etcdctl cluster-health
member 988139385f78284 is healthy: got healthy result from http://127.0.0.1:2379
member 5a0ef2a004fc4349 is healthy: got healthy result from http://127.0.0.1:2379
member f4a0cb0a765574a8 is healthy: got healthy result from http://127.0.0.1:2379
cluster is healthy
[root@hdss7-21 etcd]# /opt/etcd/etcdctl member list
988139385f78284: name=etcd-server-7-22 peerURLs=https://10.4.7.22:2380 clientURLs=http://127.0.0.1:2379,https://10.4.7.22:2379 isLeader=false
5a0ef2a004fc4349: name=etcd-server-7-21 peerURLs=https://10.4.7.21:2380 clientURLs=http://127.0.0.1:2379,https://10.4.7.21:2379 isLeader=false
f4a0cb0a765574a8: name=etcd-server-7-12 peerURLs=https://10.4.7.12:2380 clientURLs=http://127.0.0.1:23