centos7部署etcd集群

实验环境：centos7.4纯净版

192.168.216.130 node1 master

192.168.216.132 node2 slave

192.168.216.134 node3 slave

yum安装etcd

yum install etcd 
yum list installed |grep -i etcd

node1 etcd 配置

cp /etc/etcd/etcd.conf /etc/etcd/etcd.conf.bak
cd /etc/etcd/
[root@localhost etcd]# egrep ^[A-Z] ./etcd.conf
ETCD_DATA_DIR="/var/lib/etcd/node1.etcd"
ETCD_LISTEN_PEER_URLS="http://192.168.216.130:2380"
ETCD_LISTEN_CLIENT_URLS="http://192.168.216.130:2379,http://127.0.0.1:2379"
ETCD_NAME="node1"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.216.130:2380"
ETCD_ADVERTISE_CLIENT_URLS="http://192.168.216.130:2379"
ETCD_INITIAL_CLUSTER="node1=http://192.168.216.130:2380,node2=http://192.168.216.132:2380,node3=http://192.168.216.134:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"

node2 etcd 配置

cp /etc/etcd/etcd.conf /etc/etcd/etcd.conf.bak
cd /etc/etcd/
[root@localhost etcd]# egrep ^[A-Z] ./etcd.conf
ETCD_DATA_DIR="/var/lib/etcd/node2.etcd"
ETCD_LISTEN_PEER_URLS="http://192.168.216.132:2380"
ETCD_LISTEN_CLIENT_URLS="http://192.168.216.132:2379,http://127.0.0.1:2379"
ETCD_NAME="node2"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.216.132:2380"
ETCD_ADVERTISE_CLIENT_URLS="http://192.168.216.132:2379"
ETCD_INITIAL_CLUSTER="node1=http://192.168.216.130:2380,node2=http://192.168.216.132:2380,node3=http://192.168.216.134:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"

node3 etcd 配置

cp /etc/etcd/etcd.conf /etc/etcd/etcd.conf.bak
cd /etc/etcd/
[root@localhost etcd]# egrep ^[A-Z] ./etcd.conf
ETCD_DATA_DIR="/var/lib/etcd/node3.etcd"
ETCD_LISTEN_PEER_URLS="http://192.168.216.134:2380"
ETCD_LISTEN_CLIENT_URLS="http://192.168.216.134:2379,http://127.0.0.1:2379"
ETCD_NAME="node3"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.216.134:2380"
ETCD_ADVERTISE_CLIENT_URLS="http://192.168.216.134:2379"
ETCD_INITIAL_CLUSTER="node1=http://192.168.216.130:2380,node2=http://192.168.216.132:2380,node3=http://192.168.216.134:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"

　　

修改 etcd.service

[root@localhost etcd]# cat /usr/lib/systemd/system/etcd.service
[Service]
Type=notify
WorkingDirectory=/var/lib/etcd/
EnvironmentFile=-/etc/etcd/etcd.conf
User=etcd
# set GOMAXPROCS to number of processors
ExecStart=/bin/bash -c "GOMAXPROCS=$(nproc) /usr/bin/etcd 
--name="${ETCD_NAME}" 
--data-dir="${ETCD_DATA_DIR}" 
--listen-peer-urls="${ETCD_LISTEN_PEER_URLS}" 
--listen-client-urls="${ETCD_LISTEN_CLIENT_URLS}" 
--initial-advertise-peer-urls="${ETCD_INITIAL_ADVERTISE_PEER_URLS}" 
--advertise-client-urls="${ETCD_ADVERTISE_CLIENT_URLS}" 
--initial-cluster="${ETCD_INITIAL_CLUSTER}"  
--initial-cluster-token="${ETCD_INITIAL_CLUSTER_TOKEN}" 
--initial-cluster-state="${ETCD_INITIAL_CLUSTER_STATE}""
Restart=on-failure
LimitNOFILE=65536

以上操作在 node1、node2、node3 节点上都需要操作,需要修改对应的ip

启动 etcd

依次启动 node1、node2、node3 节点的 etcd

systemctl start etcd.service
systemctl status etcd.service
systemctl enable etcd.service

验证 etcd

etcdctl cluster-health

etcdctl member list

各个节点配置crontab 定时同步时间，否则可能会出现node1 etcd[1657]: the clock difference against peer f63afbe816fb463d is too hig问题

yum install ntp
crontab -e
0 1 * * * /usr/sbin/ntpdate ntp.sjtu.edu.cn >> /var/log/ntpdate.log 2>&1 &