[root@all softs]# yum install etcd -y
[root@all softs]# mv /etc/etcd/etcd.conf /etc/etcd/etcd.conf.bak
[root@k8smaster softs]# vi /etc/etcd/etcd.conf
ETCD_NAME=etcdmaster
ETCD_DATA_DIR="/var/lib/etcd/etcd-master.etcd"
ETCD_LISTEN_PEER_URLS="http://172.16.160.205:2380"
ETCD_LISTEN_CLIENT_URLS="http://172.16.160.205:2379,http://127.0.0.1:2379"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://172.16.160.205:2380"
ETCD_INITIAL_CLUSTER="etcdmaster=http://172.16.160.205:2380,etcdnode1=http://172.16.160.206:2380,etcdnode2=http://172.16.160.207:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster-00"
ETCD_ADVERTISE_CLIENT_URLS="http://172.16.160.205:2379"
[root@k8snode1 softs]# vi /etc/etcd/etcd.conf
ETCD_NAME=etcdnode1
ETCD_DATA_DIR="/var/lib/etcd/etcd-master.etcd"
ETCD_LISTEN_PEER_URLS="http://172.16.160.206:2380"
ETCD_LISTEN_CLIENT_URLS="http://172.16.160.206:2379,http://127.0.0.1:2379"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://172.16.160.206:2380"
ETCD_INITIAL_CLUSTER="etcdmaster=http://172.16.160.205:2380,etcdnode1=http://172.16.160.206:2380,etcdnode2=http://172.16.160.207:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster-00"
ETCD_ADVERTISE_CLIENT_URLS="http://172.16.160.206:2379"
[root@k8snode2 softs]# vi /etc/etcd/etcd.conf
ETCD_NAME=etcdnode2
ETCD_DATA_DIR="/var/lib/etcd/etcd-master.etcd"
ETCD_LISTEN_PEER_URLS="http://172.16.160.207:2380"
ETCD_LISTEN_CLIENT_URLS="http://172.16.160.207:2379,http://127.0.0.1:2379"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://172.16.160.207:2380"
ETCD_INITIAL_CLUSTER="etcdmaster=http://172.16.160.205:2380,etcdnode1=http://172.16.160.206:2380,etcdnode2=http://172.16.160.207:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster-00"
ETCD_ADVERTISE_CLIENT_URLS="http://172.16.160.207:2379"
启动服务文件/usr/lib/systemd/system/etcd.service一般不修改也行，注意ExecStart后的参数
[root@all softs]# mv /usr/lib/systemd/system/etcd.service /usr/lib/systemd/system/etcd.service.bak
[root@all softs]# vi /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
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=\"${ETCD_LISTEN_CLIENT_URLS}\" \
--advertise-client-urls=\"${ETCD_ADVERTISE_CLIENT_URLS}\" \
--initial-cluster-token=\"${ETCD_INITIAL_CLUSTER_TOKEN}\" \
--initial-cluster=\"${ETCD_INITIAL_CLUSTER}\" \
--initial-cluster-state=\"${ETCD_INITIAL_CLUSTER_STATE}\""
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
三台服务器全部运行并测试：
[root@all softs]# systemctl enable etcd && systemctl restart etcd && systemctl status etcd
[root@k8snode2 softs]#
查看etcd成员列表，可以看出172.16.160.205现在是leader，可以试着关闭第一台的etcd服务，领导角色会变成另外一台。
[root@all softs]# etcdctl member list
48e928c68a0c1cd6: name=etcdmaster peerURLs=http://172.16.160.205:2380 clientURLs=http://172.16.160.205:2379 isLeader=true
7eccc73b94e5aaea: name=etcdnode2 peerURLs=http://172.16.160.207:2380 clientURLs=http://172.16.160.207:2379 isLeader=false
d7378dd58f633a96: name=etcdnode1 peerURLs=http://172.16.160.206:2380 clientURLs=http://172.16.160.206:2379 isLeader=false
[root@k8smaster softs]#
查看etcd的健康情况，是否存活。
[root@all softs]# etcdctl cluster-health
member 48e928c68a0c1cd6 is healthy: got healthy result from http://172.16.160.205:2379
member 7eccc73b94e5aaea is healthy: got healthy result from http://172.16.160.207:2379
member d7378dd58f633a96 is healthy: got healthy result from http://172.16.160.206:2379
cluster is healthy
[root@k8smaster softs]#
[root@all softs]# curl -L http://172.16.160.205:2379/version
{"etcdserver":"3.0.15","etcdcluster":"3.0.0"}
[root@all softs]# curl -L http://172.16.160.206:2379/version
{"etcdserver":"3.0.15","etcdcluster":"3.0.0"}
[root@all softs]# curl -L http://172.16.160.207:2379/version
{"etcdserver":"3.0.15","etcdcluster":"3.0.0"}
旧的文档一般是使用4012端口，新版本使用2379端口作为监听端口
删除节点命令：etcdctl member remove XXXXXXXX
添加节点命令：etcdctl member add k8snode2 http://172.16.160.208:2380
ETCD_DATA_DIR="/var/lib/etcd/etcd-master.etcd" ETCD数据存放目录，卸载ETCD时，也要删除。
查看etcd版本信息：
[root@k8snode2 etcd-master.etcd]# etcdctl --version
etcdctl version: 3.0.15
API version: 2
[root@k8snode2 etcd-master.etcd]#
