node1 192.168.56.173 node2 192.168.56.174 node3 192.168.56.200 node* 为主机名称 [root@node1 ~]# cat /etc/redhat-release CentOS Linux release 7.2.1511 (Core) [root@node1 ~]#
https://github.com/coreos/etcd/releases/download/v3.0.15/etcd-v3.0.15-linux-amd64.tar.gz tar xf etcd-v3.0.15-linux-amd64.tar.gz cd etcd-v3.0.15-linux-amd64 cp etcd /usr/bin/ cp etcdctl /usr/bin/
192.168.56.173(node1)
cat /etc/systemd/system/etcd2.service
[Unit] Description=etcd2.service [Service] Type=notify TimeoutStartSec=0 Restart=always ExecStartPre=-/usr/bin/mkdir -p /data/etcd2 ExecStart=/usr/bin/etcd \ --data-dir /data/etcd2 \ --name etcd0 \ --advertise-client-urls http://192.168.56.173:2379,http://192.168.56.173:4001 \ --listen-client-urls http://0.0.0.0:2379,http://0.0.0.0:4001 \ --initial-advertise-peer-urls http://192.168.56.173:2380 \ --listen-peer-urls http://0.0.0.0:2380 \ --initial-cluster-token etcd-cluster-1 \ --initial-cluster etcd0=http://192.168.56.173:2380,etcd1=http://192.168.56.174:2380,etcd2=http://192.168.56.200:2380 [Install] WantedBy=multi-user.target
# 设置服务自启动 systemctl enable /etc/systemd/system/etcd2.service # 启动etcd1 (先不要做 三个节点都部署完毕 在分别启动 否则启动会hang) systemctl restart etcd2.service
192.168.56.174(node2)
[root@node2 ~]# cat /etc/systemd/system/etcd2.service
[Unit] Description=etcd2.service [Service] Type=notify TimeoutStartSec=0 Restart=always ExecStartPre=-/usr/bin/mkdir -p /data/etcd2 ExecStart=/usr/bin/etcd \ --data-dir /data/etcd2 \ --name etcd1 \ --advertise-client-urls http://192.168.56.174:2379,http://192.168.56.174:4001 \ --listen-client-urls http://0.0.0.0:2379,http://0.0.0.0:4001 \ --initial-advertise-peer-urls http://192.168.56.174:2380 \ --listen-peer-urls http://0.0.0.0:2380 \ --initial-cluster-token etcd-cluster-1 \ --initial-cluster etcd0=http://192.168.56.173:2380,etcd1=http://192.168.56.174:2380,etcd2=http://192.168.56.200:2380 [Install] WantedBy=multi-user.target
# 设置服务自启动 systemctl enable /etc/systemd/system/etcd2.service # 启动etcd2 (先不要做 三个节点都部署完毕 在分别启动 否则启动会hang) systemctl restart etcd2.service
192.168.56.200(node2)
[root@node3~]# cat /etc/systemd/system/etcd2.service
[root@node3 ~]# cat /etc/systemd/system/etcd2.service [Unit] Description=etcd2.service [Service] Type=notify TimeoutStartSec=0 Restart=always ExecStartPre=-/usr/bin/mkdir -p /data/etcd2 ExecStart=/usr/bin/etcd \ --data-dir /data/etcd2 \ --name etcd2 \ --advertise-client-urls http://192.168.56.200:2379,http://192.168.56.200:4001 \ --listen-client-urls http://0.0.0.0:2379,http://0.0.0.0:4001 \ --initial-advertise-peer-urls http://192.168.56.200:2380 \ --listen-peer-urls http://0.0.0.0:2380 \ --initial-cluster-token etcd-cluster-1 \ --initial-cluster etcd0=http://192.168.56.173:2380,etcd1=http://192.168.56.174:2380,etcd2=http://192.168.56.200:2380 [Install] WantedBy=multi-user.target
# 设置服务自启动 systemctl enable /etc/systemd/system/etcd2.service # 启动etcd3 (先不要做 三个节点都部署完毕 在分别启动 否则启动会hang) systemctl restart etcd2.service
备注：启动的方式一个一个启动 否则systemctl restart etcd2.service 会hang住
查看状态
[root@node3 ~]# systemctl status etcd2.service ● etcd2.service Loaded: loaded (/etc/systemd/system/etcd2.service; enabled; vendor preset: disabled) Active: active (running) since Sat 2017-09-02 23:43:59 CST; 10min ago Process: 2673 ExecStartPre=/usr/bin/mkdir -p /data/etcd2 (code=exited, status=0/SUCCESS) Main PID: 2675 (etcd) CGroup: /system.slice/etcd2.service └─2675 /usr/bin/etcd --data-dir /data/etcd2 --name etcd2 --advertise-client-urls http://192.168.56.200:2379,http://192.168.56.200:4001 --listen-client-urls http://0.0.0.0:2379,http://0.0.0.0:4001... Sep 02 23:44:45 node3 etcd[2675]: established a TCP streaming connection with peer e37f661be0f0e44a (stream Message reader) Sep 02 23:44:45 node3 etcd[2675]: established a TCP streaming connection with peer 161efc88633d5fd4 (stream MsgApp v2 reader) Sep 02 23:44:45 node3 etcd[2675]: established a TCP streaming connection with peer 161efc88633d5fd4 (stream Message reader) Sep 02 23:44:45 node3 etcd[2675]: closed an existing TCP streaming connection with peer 161efc88633d5fd4 (stream Message writer) Sep 02 23:44:45 node3 etcd[2675]: established a TCP streaming connection with peer 161efc88633d5fd4 (stream Message writer) Sep 02 23:44:46 node3 etcd[2675]: 52aafe548d51c9ea [term: 25] received a MsgVote message with higher term from e37f661be0f0e44a [term: 26] Sep 02 23:44:46 node3 etcd[2675]: 52aafe548d51c9ea became follower at term 26 Sep 02 23:44:46 node3 etcd[2675]: 52aafe548d51c9ea [logterm: 20, index: 623, vote: 0] voted for e37f661be0f0e44a [logterm: 20, index: 623] at term 26 Sep 02 23:44:46 node3 etcd[2675]: 52aafe548d51c9ea [term: 26] ignored a MsgVote message with lower term from 161efc88633d5fd4 [term: 24] Sep 02 23:44:46 node3 etcd[2675]: raft.node: 52aafe548d51c9ea elected leader e37f661be0f0e44a at term 26 [root@node3 ~]#
[root@node3 ~]# netstat -lntup Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 869/sshd tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 1132/master tcp6 0 0 :::2379 :::* LISTEN 2675/etcd tcp6 0 0 :::2380 :::* LISTEN 2675/etcd tcp6 0 0 :::22 :::* LISTEN 869/sshd tcp6 0 0 ::1:25 :::* LISTEN 1132/master tcp6 0 0 :::4001 :::* LISTEN 2675/etcd [root@node3 ~]#
查看相关主体的状态
[root@node1 etcd-v3.0.15-linux-amd64]# etcdctl member list 161efc88633d5fd4: name=etcd0 peerURLs=http://192.168.56.173:2380 clientURLs=http://192.168.56.173:2379,http://192.168.56.173:4001 isLeader=false 52aafe548d51c9ea: name=etcd2 peerURLs=http://192.168.56.200:2380 clientURLs=http://192.168.56.200:2379,http://192.168.56.200:4001 isLeader=false e37f661be0f0e44a: name=etcd1 peerURLs=http://192.168.56.174:2380 clientURLs=http://192.168.56.174:2379,http://192.168.56.174:4001 isLeader=true [root@node1 etcd-v3.0.15-linux-amd64]#
集群的状态监控（可以结合zabbix做监控）
[root@node1 etcd-v3.0.15-linux-amd64]# etcdctl cluster-health member 161efc88633d5fd4 is healthy: got healthy result from http://192.168.56.173:2379 member 52aafe548d51c9ea is healthy: got healthy result from http://192.168.56.200:2379 member e37f661be0f0e44a is healthy: got healthy result from http://192.168.56.174:2379 cluster is healthy [root@node1 etcd-v3.0.15-linux-amd64]#
etcd基本操作
[root@node1 ~]# etcdctl set testkey "hello world"
hello world
[root@node1 ~]# etcdctl get testkey
hello world
[root@node1 ~]# curl -L http://localhost:2379/v2/keys/testkey
{"action":"get","node":{"key":"/testkey","value":"hello world","modifiedIndex":11,"createdIndex":11}}
[root@node1 ~]# curl -L http://192.168.56.173:2379/v2/keys/testkey
{"action":"get","node":{"key":"/testkey","value":"hello world","modifiedIndex":11,"createdIndex":11}}
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