一、Etcd數據備份

1、備份命令

[root@localhost ~]# export ETCDCTL_API=3
[root@localhost ~]# /data/etcd-3.4.9/bin/etcdctl --endpoints=10.2.20.108:2379 snapshot save etcd-`date "+%Y-%m-%d_%H-%M-%S"`.snapshot

2、備份完成后會在當前目錄生成備份文件

[root@localhost ~]# ls
anaconda-ks.cfg  etcd-2023-08-17_16-43-08.snapshot  etcd-3.4.9.tar.gz

二、數據恢復

etcd集群中所有實例，可通過隨意一臺etcd的備份文件進行恢復，數據是一樣的。

備份恢復命令模版

?ETCDCTL_API=3 etcdctl snapshot restore +備份文件名 \
? --name \ ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ????????????????????????#當前實例在集群中的名字 ??
? --initial-cluster ?\? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?#集群中所有實例通訊地址。
? --initial-cluster-token etcd-cluster?\? ? ? ? ? ? ? ? ? #集群名字，不要與已有集群沖突
? --initial-advertise-peer-urls ? ?\? ? ? ? ? ? ? ? ? ? ? ? ?#當前實例進群通訊地址
? --data-dir /data/mydata_etcd_3.4.9?? ??? ??? ??? ??#數據恢復目錄

1、實例1恢復

$ ETCDCTL_API=3 etcdctl snapshot restore etcd-2023-08-17_16-43-08.snapshot \--name etcd-201 \--initial-cluster etcd-201=http://10.2.20.77:2380,etcd-202=http://10.2.20.88:2380,etcd-203=http://10.2.20.99:2380 \--initial-cluster-token etcd-cluster \--initial-advertise-peer-urls http://10.2.20.77:2380 \--data-dir /data/mydata_etcd_3.4.9

2、實例2恢復

$ ETCDCTL_API=3 etcdctl snapshot restore etcd-2023-08-17_16-43-08.snapshot \--name etcd-202 \--initial-cluster etcd-201=http://10.2.20.77:2380,etcd-202=http://10.2.20.88:2380,etcd-203=http://10.2.20.99:2380 \--initial-cluster-token etcd-cluster \--initial-advertise-peer-urls http://10.2.20.88:2380 \--data-dir /data/mydata_etcd_3.4.9

3、實例3恢復

$ ETCDCTL_API=3 etcdctl snapshot restore etcd-2023-08-17_16-43-08.snapshot \--name etcd-203 \--initial-cluster etcd-201=http://10.2.20.77:2380,etcd-202=http://10.2.20.88:2380,etcd-203=http://10.2.20.99:2380 \--initial-cluster-token etcd-cluster \--initial-advertise-peer-urls http://10.2.20.99:2380 \--data-dir /data/mydata_etcd_3.4.9

4、啟動恢復后的集群

systemctl daemon-reload
systemctl start etcd

5、檢查新進群

查看leader是否選舉成功[root@etcd003 ~]# ETCDCTL_API=3 /data/hxsd-etcd-3.4.9/bin/etcdctl  --endpoints="http://10.2.20.77:2379,http://10.2.20.88:2379,http://10.2.20.99:2379"   endpoint status --write-out=table
+-----------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
|          ENDPOINT           |        ID        | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+-----------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
|  http://10.2.20.77:2379 | 52fba0ba228f3da3 |   3.4.9 |  2.1 GB |     false |      false |        50 |          9 |                  9 |        |
|  http://10.2.20.88:2379 | 4907167561836ce3 |   3.4.9 |  2.1 GB |      true |      false |        50 |          9 |                  9 |        |
|  http://10.2.20.99:2379 | b80cd01b4c2b7a1c |   3.4.9 |  2.1 GB |     false |      false |        50 |          9 |                  9 |        |
+-----------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+