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etcd集群部署

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说明

在三台机器上搭建一个集群

服务器 IP
node152 172.16.20.152
node153 172.16.20.153
node154 172.16.20.154

部署

  • 安装etcd
yum -y install etcd
  • 修改默认配置: /etc/etcd/etcd.conf
ETCD_DATA_DIR="/home/etcd/node152.etcd"
ETCD_LISTEN_PEER_URLS="http://172.16.20.152:2380"
ETCD_LISTEN_CLIENT_URLS="http://172.16.20.152:2379,http://localhost:2379"
ETCD_NAME="node152"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://172.16.20.152:2380"
ETCD_ADVERTISE_CLIENT_URLS="http://172.16.20.152:2379"
ETCD_INITIAL_CLUSTER="node152=http://172.16.20.152:2380,node153=http://172.16.20.153:2380,node154=http://172.16.20.154:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"

注意：数据目录etcd用户有权限创建,或者提前创建好并分配权限;
其他节点根据IP修改.

  • 修改服务配置: /usr/lib/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target

[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=\"${ETCD_DATA_DIR}\" --listen-client-urls=\"${ETCD_LISTEN_CLIENT_URLS}\" \
--listen-peer-urls=\"${ETCD_LISTEN_PEER_URLS}\" \
--initial-advertise-peer-urls=\"${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

[Install]
WantedBy=multi-user.target
  • 启动并设置开机启动
systemctl start etcd
systemctl enable etcd
  • 检查集群状态
[root@data7 home]# etcdctl cluster-health
member 1031e29bb8572c51 is healthy: got healthy result from http://172.16.20.152:2379
member 6937e3968a3fec18 is healthy: got healthy result from http://172.16.20.154:2379
member 8b79f77c6775414b is healthy: got healthy result from http://172.16.20.153:2379
cluster is healthy

[root@data7 home]# etcdctl member list
1031e29bb8572c51: name=node152 peerURLs=http://172.16.20.152:2380 clientURLs=http://172.16.20.152:2379 isLeader=true
6937e3968a3fec18: name=node154 peerURLs=http://172.16.20.154:2380 clientURLs=http://172.16.20.154:2379 isLeader=false
8b79f77c6775414b: name=node153 peerURLs=http://172.16.20.153:2380 clientURLs=http://172.16.20.153:2379 isLeader=false

常见问题

  1. 通过v3版本写入，etcdctl 命令查不到.
    ETCD v2 v3版本数据不互通,需要指定版本：export ETCDCTL_API=3