etcd集群添加节点

查看当前集群节点信息

# etcdctl member list --write-out=table
+------------------+---------+--------------------+--------------------------------+-----------------------------------------------------+------------+
|        ID        | STATUS  |        NAME        |           PEER ADDRS           |                    CLIENT ADDRS                     | IS LEARNER |
+------------------+---------+--------------------+--------------------------------+-----------------------------------------------------+------------+
| 44d8bc3300880bcd | started | sht-sgmhadoopdn-01 | http://sht-sgmhadoopdn-01:2380 | http://10.0.0.1:2379,http://sht-sgmhadoopdn-01:2379 |      false |
| d446fbe3296eb85a | started | sht-sgmhadoopdn-03 | http://sht-sgmhadoopdn-03:2380 | http://10.0.0.1:2379,http://sht-sgmhadoopdn-02:2379 |      false |
| e9136c1ad1754783 | started | sht-sgmhadoopdn-02 | http://sht-sgmhadoopdn-02:2380 | http://10.0.0.1:2379,http://sht-sgmhadoopdn-02:2379 |      false |
+------------------+---------+--------------------+--------------------------------+-----------------------------------------------------+------------+

添加新节点sht-sgmhadoopdn-04(172.16.101.66)

添加集群节点对应hosts文件解析

# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
172.16.101.58    sht-sgmhadoopdn-01
172.16.101.59    sht-sgmhadoopdn-02
172.16.101.60    sht-sgmhadoopdn-03
172.16.101.66    sht-sgmhadoopdn-04

在现有集群接点添加新节点

# etcdctl member add sht-sgmhadoopdn-04 --peer-urls="http://sht-sgmhadoopdn-04:2380"
Member 7796493c3943f891 added to cluster 69bef0b9ccf44365

ETCD_NAME="sht-sgmhadoopdn-04"
ETCD_INITIAL_CLUSTER="sht-sgmhadoopdn-01=http://sht-sgmhadoopdn-01:2380,sht-sgmhadoopdn-04=http://sht-sgmhadoopdn-04:2380,sht-sgmhadoopdn-03=http://sht-sgmhadoopdn-03:2380,sht-sgmhadoopdn-02=http://sht-sgmhadoopdn-02:2380"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://sht-sgmhadoopdn-04:2380"
ETCD_INITIAL_CLUSTER_STATE="existing"

新节点的etcd配置文件必须包括以上输出内容

查看当前集群信息

# etcdctl member list --write-out=table
+------------------+-----------+--------------------+--------------------------------+-----------------------------------------------------+------------+
|        ID        |  STATUS   |        NAME        |           PEER ADDRS           |                    CLIENT ADDRS                     | IS LEARNER |
+------------------+-----------+--------------------+--------------------------------+-----------------------------------------------------+------------+
| 44d8bc3300880bcd |   started | sht-sgmhadoopdn-01 | http://sht-sgmhadoopdn-01:2380 | http://10.0.0.1:2379,http://sht-sgmhadoopdn-01:2379 |      false |
| 7796493c3943f891 | unstarted |                    | http://sht-sgmhadoopdn-04:2380 |                                                     |      false |
| d446fbe3296eb85a |   started | sht-sgmhadoopdn-03 | http://sht-sgmhadoopdn-03:2380 | http://10.0.0.1:2379,http://sht-sgmhadoopdn-02:2379 |      false |
| e9136c1ad1754783 |   started | sht-sgmhadoopdn-02 | http://sht-sgmhadoopdn-02:2380 | http://10.0.0.1:2379,http://sht-sgmhadoopdn-02:2379 |      false |
+------------------+-----------+--------------------+--------------------------------+-----------------------------------------------------+------------+

新节点配置etcd

etcd系统服务文件

# cat /usr/lib/systemd/system/etcd.service
[Unit]
Description=etcd service
Documentation=https://github.com/etcd-io/etcd
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
User=tnuser
Type=notify
EnvironmentFile=/usr/local/etcd/etcd.conf
WorkingDirectory=/usr/local/etcd
ExecStart=/usr/local/etcd/etcd
Restart=always
RestartSec=10s
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

etcd配置文件

# cat /usr/local/etcd/etcd.conf
ETCD_NAME="sht-sgmhadoopdn-04"
ETCD_DATA_DIR="/usr/local/etcd/data"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster-01"
ETCD_INITIAL_CLUSTER_STATE="existing"
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
ETCD_ADVERTISE_CLIENT_URLS="http://sht-sgmhadoopdn-01:2379,http://10.0.0.1:2379"
ETCD_LISTEN_PEER_URLS="http://0.0.0.0:2380"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://sht-sgmhadoopdn-04:2380"
ETCD_INITIAL_CLUSTER="sht-sgmhadoopdn-01=http://sht-sgmhadoopdn-01:2380,sht-sgmhadoopdn-02=http://sht-sgmhadoopdn-02:2380,sht-sgmhadoopdn-03=http://sht-sgmhadoopdn-03:2380,sht-sgmhadoopdn-04=http://sht-sgmhadoopdn-04:2380"
ETCD_ENABLE_V2="true"

启动新节点

# systemctl start etcd

再次查看集群状态

# etcdctl member list --write-out=table
+------------------+---------+--------------------+--------------------------------+-----------------------------------------------------+------------+
|        ID        | STATUS  |        NAME        |           PEER ADDRS           |                    CLIENT ADDRS                     | IS LEARNER |
+------------------+---------+--------------------+--------------------------------+-----------------------------------------------------+------------+
| 44d8bc3300880bcd | started | sht-sgmhadoopdn-01 | http://sht-sgmhadoopdn-01:2380 | http://10.0.0.1:2379,http://sht-sgmhadoopdn-01:2379 |      false |
| 7796493c3943f891 | started | sht-sgmhadoopdn-04 | http://sht-sgmhadoopdn-04:2380 | http://10.0.0.1:2379,http://sht-sgmhadoopdn-01:2379 |      false |
| d446fbe3296eb85a | started | sht-sgmhadoopdn-03 | http://sht-sgmhadoopdn-03:2380 | http://10.0.0.1:2379,http://sht-sgmhadoopdn-02:2379 |      false |
| e9136c1ad1754783 | started | sht-sgmhadoopdn-02 | http://sht-sgmhadoopdn-02:2380 | http://10.0.0.1:2379,http://sht-sgmhadoopdn-02:2379 |      false |
+------------------+---------+--------------------+--------------------------------+-----------------------------------------------------+------------+

将各节点etcd.conf配置文件的变量ETCD_INITIAL_CLUSTER添加新节点信息，然后依次重启。