etcd集群部署

一、创建数据存储目录

mkdir /apps/etcd/ -pv 

二、创建配置文件目录

mkdir /etc/etcd/

三、编辑配置文件

配置文件中的 ETCD_INITIAL_CLUSTER 参数请按需修改
服务启动成功之后执行 sed -i '/ETCD_INITIAL_CLUSTER_STATE/s@new@existing@' /etc/etcd/etcd.conf

LOCAL_IP="$(ip addr show eth0|grep -Po '(?<=inet )[0-9.]+')"
cat > /etc/etcd/etcd.conf << EOF
# Member
ETCD_NAME=etcd-01 # 需要修改为各成员对应名称
ETCD_DATA_DIR="/apps/etcd/"
ETCD_LISTEN_CLIENT_URLS="http://${LOCAL_IP}:2379,http://127.0.0.1:2379"
ETCD_LISTEN_PEER_URLS="http://${LOCAL_IP}:2380"
 
# Cluster
ETCD_ADVERTISE_CLIENT_URLS="http://${LOCAL_IP}:2379"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://${LOCAL_IP}:2380"
ETCD_INITIAL_CLUSTER="etcd-02=http://172.20.1.27:2380,etcd-01=http://172.20.1.26:2380,etcd-03=http://172.20.1.28:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster-1"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF

四、编写Service文件

systemctl cat etcd
# /etc/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
 
[Service]
Type=notify
EnvironmentFile=/etc/etcd/etcd.conf
ExecStart=/usr/local/bin/etcd
Restart=on-failure
LimitNOFILE=65536
 
[Install]
WantedBy=multi-user.target

五、启动服务

启动服务之前请先将所有节点都准备好

systemctl daemon-reload 
systemctl start etcd

六、验证集群状态

1. 查看集群成员

etcdctl member list --write-out table
+------------------+---------+---------+-------------------------+-------------------------+------------+
|        ID        | STATUS  |  NAME   |       PEER ADDRS        |      CLIENT ADDRS       | IS LEARNER |
+------------------+---------+---------+-------------------------+-------------------------+------------+
| 11582579cb716706 | started | etcd-02 | http://172.20.1.27:2380 | http://172.20.1.27:2379 |      false |
| 3909c7e83049bd5d | started | etcd-01 | http://172.20.1.26:2380 | http://172.20.1.26:2379 |      false |
| a10314259291b7b2 | started | etcd-03 | http://172.20.1.28:2380 | http://172.20.1.28:2379 |      false |
+------------------+---------+---------+-------------------------+-------------------------+------------+

2. 查看成员健康状态

etcdctl --endpoints="http://172.20.1.26:2379,http://172.20.1.27:2379,http://172.20.1.28:2379" --write-out table endpoint health 
+-------------------------+--------+-------------+-------+
|        ENDPOINT         | HEALTH |    TOOK     | ERROR |
+-------------------------+--------+-------------+-------+
| http://172.20.1.26:2379 |   true |   6.12222ms |       |
| http://172.20.1.28:2379 |   true |  6.812195ms |       |
| http://172.20.1.27:2379 |   true | 12.847463ms |       |
+-------------------------+--------+-------------+-------+

3. 查看成员状态

etcdctl --endpoints="http://172.20.1.26:2379,http://172.20.1.27:2379,http://172.20.1.28:2379" endpoint status  --write-out table 
+-------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
|        ENDPOINT         |        ID        | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+-------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| http://172.20.1.26:2379 | 3909c7e83049bd5d |   3.5.3 |   20 kB |      true |      false |         2 |         12 |                 12 |        |
| http://172.20.1.27:2379 | 11582579cb716706 |   3.5.3 |   20 kB |     false |      false |         2 |         12 |                 12 |        |
| http://172.20.1.28:2379 | a10314259291b7b2 |   3.5.3 |   20 kB |     false |      false |         2 |         12 |                 12 |        |
+-------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+