k8s学习：etcd增加节点-江哥架构师笔记

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当前etcd集群3个节点，需要添加一个新节点

添加集群节点对应hosts文件解析，四个节点都要添加

[root@k8s-test-1 ~]#cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4 
 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

10.216.4.14 k8s-test-1 kd1
10.216.4.15 k8s-test-2 kd2
10.216.4.131 k8s-test-3 kd3
10.216.4.133 k8s-test-4 kd4

查看当前集群节点信息

[root@k8s-test-1 ~]#echo ${ETCD_ENDPOINTS}
https://10.216.4.14:2379,https://10.216.4.15:2379,https://10.216.4.131:2379

查看哪个是主

[root@k8s-test-1 ~]#source /opt/k8s/bin/environment.sh
ETCDCTL_API=3 /opt/k8s/bin/etcdctl \
  --cacert=/opt/k8s/work/ca.pem \
  --cert=/etc/etcd/cert/etcd.pem \
  --key=/etc/etcd/cert/etcd-key.pem \
  --endpoints=${ETCD_ENDPOINTS}  endpoint status -w table
+---------------------------+------------------+---------+---------+-----------+-----------+------------+
|         ENDPOINT          |        ID        | VERSION | DB SIZE | IS LEADER | RAFT TERM | RAFT INDEX |
+---------------------------+------------------+---------+---------+-----------+-----------+------------+
|  https://10.216.4.14:2379 | 2f763843250a81d5 |  3.3.10 |  1.0 GB |     false |      3337 |  142362718 |
|  https://10.216.4.15:2379 | 629ea6abbc1a7568 |  3.3.10 |  1.0 GB |     false |      3337 |  142362718 |
| https://10.216.4.131:2379 | 9642036ea2eae87f |  3.3.10 |  1.0 GB |      true |      3337 |  142362718 |
+---------------------------+------------------+---------+---------+-----------+-----------+------------+

查看id

[root@k8s-test-1 ~]#source /opt/k8s/bin/environment.sh
ETCDCTL_API=3 /opt/k8s/bin/etcdctl \
  --cacert=/opt/k8s/work/ca.pem \
  --cert=/etc/etcd/cert/etcd.pem \
  --key=/etc/etcd/cert/etcd-key.pem \
  --endpoints=${ETCD_ENDPOINTS}  member list -w table
+------------------+---------+------------+---------------------------+---------------------------+
|        ID        | STATUS  |    NAME    |        PEER ADDRS         |       CLIENT ADDRS        |
+------------------+---------+------------+---------------------------+---------------------------+
| 2f763843250a81d5 | started | k8s-test-1 |  https://10.216.4.14:2380 |  https://10.216.4.14:2379 |
| 629ea6abbc1a7568 | started | k8s-test-2 |  https://10.216.4.15:2380 |  https://10.216.4.15:2379 |
| 9642036ea2eae87f | started | k8s-test-3 | https://10.216.4.131:2380 | https://10.216.4.131:2379 |
+------------------+---------+------------+---------------------------+---------------------------+

添加，注意参数少些，如果需要添加多个，只能一个添加，启动后。才能添加另一个

[root@k8s-test-1 ~]#source /opt/k8s/bin/environment.sh
ETCDCTL_API=3 /opt/k8s/bin/etcdctl \
  --cacert=/opt/k8s/work/ca.pem \
  --cert=/etc/etcd/cert/etcd.pem \
  --key=/etc/etcd/cert/etcd-key.pem \
  --endpoints=${ETCD_ENDPOINTS}  member add k8s-test-4  --peer-urls="https://10.216.4.133:2380"
Member 242fd1a3042c7a82 added to cluster 5a2ad62d6bc1850f

ETCD_NAME="k8s-test-4"
ETCD_INITIAL_CLUSTER="k8s-test-4=https://10.216.4.133:2380,k8s-test-1=https://10.216.4.14:2380,k8s-test-2=https://10.216.4.15:2380,k8s-test-3=https://10.216.4.131:2380"
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://10.216.4.133:2380"
ETCD_INITIAL_CLUSTER_STATE="existing"

查看结果

[root@k8s-test-1 ~]#source /opt/k8s/bin/environment.sh
ETCDCTL_API=3 /opt/k8s/bin/etcdctl \
  --cacert=/opt/k8s/work/ca.pem \
  --cert=/etc/etcd/cert/etcd.pem \
  --key=/etc/etcd/cert/etcd-key.pem \
  --endpoints=${ETCD_ENDPOINTS}  member list -w table 
+------------------+-----------+------------+---------------------------+---------------------------+
|        ID        |  STATUS   |    NAME    |        PEER ADDRS         |       CLIENT ADDRS        |
+------------------+-----------+------------+---------------------------+---------------------------+
| 242fd1a3042c7a82 | unstarted |            | https://10.216.4.133:2380 |                           |
| 2f763843250a81d5 |   started | k8s-test-1 |  https://10.216.4.14:2380 |  https://10.216.4.14:2379 |
| 629ea6abbc1a7568 |   started | k8s-test-2 |  https://10.216.4.15:2380 |  https://10.216.4.15:2379 |
| 9642036ea2eae87f |   started | k8s-test-3 | https://10.216.4.131:2380 | https://10.216.4.131:2379 |
+------------------+-----------+------------+---------------------------+---------------------------+

将kd1上证书文件和systemd文件拷贝到kd4上对应位置

重新生成证书，证书中添加kd4对应的ip，将证书同步到4个节点，并重启前3个节点的etcd

kd4上操作

创建数据目录

[root@k8s-test-4 ~]#source /opt/k8s/bin/environment.sh
[root@k8s-test-4 ~]#echo ${ETCD_DATA_DIR} ${ETCD_WAL_DIR}
/data/k8s/etcd/data /data/k8s/etcd/wal
[root@k8s-test-4 ~]#mkdir -vp ${ETCD_DATA_DIR} ${ETCD_WAL_DIR}

修改systemd 中new为existing，以及对应的hostname，ip

[root@k8s-test-4 /data/k8s/etcd]#cat /etc/systemd/system/etcd.service 
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
Documentation=https://github.com/coreos

[Service]
Type=notify
WorkingDirectory=/data/k8s/etcd/data
ExecStart=/opt/k8s/bin/etcd \
  --data-dir=/data/k8s/etcd/data \
  --wal-dir=/data/k8s/etcd/wal \
  --name=k8s-test-4 \
  --cert-file=/etc/etcd/cert/etcd.pem \
  --key-file=/etc/etcd/cert/etcd-key.pem \
  --trusted-ca-file=/etc/kubernetes/cert/ca.pem \
  --peer-cert-file=/etc/etcd/cert/etcd.pem \
  --peer-key-file=/etc/etcd/cert/etcd-key.pem \
  --peer-trusted-ca-file=/etc/kubernetes/cert/ca.pem \
  --peer-client-cert-auth \
  --client-cert-auth \
  --listen-peer-urls=https://10.216.4.133:2380 \
  --initial-advertise-peer-urls=https://10.216.4.133:2380 \
  --listen-client-urls=https://10.216.4.133:2379,http://127.0.0.1:2379 \
  --advertise-client-urls=https://10.216.4.133:2379 \
  --initial-cluster-token=etcd-cluster-0 \
  --initial-cluster=k8s-test-1=https://10.216.4.14:2380,k8s-test-2=https://10.216.4.15:2380,k8s-test-3=https://10.216.4.131:2380,k8s-test-4=https://10.216.4.133:2380 \
  --initial-cluster-state=existing \
  --auto-compaction-mode=periodic \
  --auto-compaction-retention=1 \
  --max-request-bytes=33554432 \
  --quota-backend-bytes=6442450944 \
  --heartbeat-interval=250 \
  --election-timeout=2000
Restart=on-failure
RestartSec=5
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

启动服务

systemctl daemon-reload && systemctl enable etcd && systemctl restart etcd && systemctl status etcd

查看mem，默认显示3个，加–cluster显示所有

[root@k8s-test-1 ~]#source /opt/k8s/bin/environment.sh
ETCDCTL_API=3 /opt/k8s/bin/etcdctl \
  --cacert=/opt/k8s/work/ca.pem \
  --cert=/etc/etcd/cert/etcd.pem \
  --key=/etc/etcd/cert/etcd-key.pem \
  --endpoints=${ETCD_ENDPOINTS}  endpoint status -w table --cluster
+---------------------------+------------------+---------+---------+-----------+-----------+------------+
|         ENDPOINT          |        ID        | VERSION | DB SIZE | IS LEADER | RAFT TERM | RAFT INDEX |
+---------------------------+------------------+---------+---------+-----------+-----------+------------+
|  https://10.216.4.14:2379 | 2f763843250a81d5 |  3.3.10 |  1.0 GB |      true |      3352 |  142408685 |
|  https://10.216.4.15:2379 | 629ea6abbc1a7568 |  3.3.10 |  1.0 GB |     false |      3352 |  142408685 |
| https://10.216.4.131:2379 | 9642036ea2eae87f |  3.3.10 |  1.0 GB |     false |      3352 |  142408685 |
| https://10.216.4.133:2379 | f3873401a4dbc16a |  3.3.10 |  1.0 GB |     false |      3352 |  142408685 |
+---------------------------+------------------+---------+---------+-----------+-----------+------------+

将各节点添加到变量ETCD_INITIAL_CLUSTER添加新节点信息，然后依次重启。

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k8s学习：etcd增加节点

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