kubernetes-集群备份和恢复
[root@master ~]# ETCDCTL_API= etcdctl snapshot save /backup/k8s1/snapshot.db
Snapshot saved at /backup/k8s1/snapshot.db
[root@master ~]# du -h /backup/k8s1/snapshot.db
1.6M /backup/k8s1/snapshot.db
3:拷贝kubernetes目录下ssl文件
[root@master ~]# cp /etc/kubernetes/ssl/* /backup/k8s1/
[root@master ~]# ll /backup/k8s1/
总用量 1628
-rw-r--r--. 1 root root 1675 12月 10 21:21 admin-key.pem
-rw-r--r--. 1 root root 1391 12月 10 21:21 admin.pem
-rw-r--r--. 1 root root 997 12月 10 21:21 aggregator-proxy.csr
-rw-r--r--. 1 root root 219 12月 10 21:21 aggregator-proxy-csr.json
-rw-------. 1 root root 1675 12月 10 21:21 aggregator-proxy-key.pem
-rw-r--r--. 1 root root 1383 12月 10 21:21 aggregator-proxy.pem
-rw-r--r--. 1 root root 294 12月 10 21:21 ca-config.json
-rw-r--r--. 1 root root 1675 12月 10 21:21 ca-key.pem
-rw-r--r--. 1 root root 1350 12月 10 21:21 ca.pem
-rw-r--r--. 1 root root 1082 12月 10 21:21 kubelet.csr
-rw-r--r--. 1 root root 283 12月 10 21:21 kubelet-csr.json
-rw-------. 1 root root 1675 12月 10 21:21 kubelet-key.pem
-rw-r--r--. 1 root root 1452 12月 10 21:21 kubelet.pem
-rw-r--r--. 1 root root 1273 12月 10 21:21 kubernetes.csr
-rw-r--r--. 1 root root 488 12月 10 21:21 kubernetes-csr.json
-rw-------. 1 root root 1679 12月 10 21:21 kubernetes-key.pem
-rw-r--r--. 1 root root 1639 12月 10 21:21 kubernetes.pem
-rw-r--r--. 1 root root 1593376 12月 10 21:32 snapshot.db
4:模拟集群崩溃,执行clean.yml清除操作
[root@master ~]# cd /etc/ansible/
[root@master ansible]# ansible-playbook .clean.yml
[root@master ansible]# ansible-playbook .prepare.yml
[root@master ansible]# ansible-playbook .etcd.yml
[root@master ansible]# ansible-playbook .docker.yml
[root@master ansible]# ansible-playbook .kube-master.yml
[root@master ansible]# ansible-playbook .kube-node.yml
3:暂停etcd服务
[root@master ansible]# ansible etcd -m service -a 'name=etcd state=stopped'
4:清空数据
[root@master ansible]# ansible etcd -m file -a 'name=/var/lib/etcd/member/ state=absent'
[DEPRECATION WARNING]: The TRANSFORM_INVALID_GROUP_CHARS settings is set to allow bad characters in group names by default, this will change, but still be user
configurable on deprecation. This feature will be removed in version 2.10. Deprecation warnings can be disabled by setting deprecation_warnings=False in ansible.cfg.
[WARNING]: Invalid characters were found in group names but not replaced, use -vvvv to see details 192.168.1.203 | CHANGED => {
"ansible_facts": {
"discovered_interpreter_python": "/usr/bin/python"
},
"changed": true,
"path": "/var/lib/etcd/member/",
"state": "absent"
}
192.168.1.202 | CHANGED => {
"ansible_facts": {
"discovered_interpreter_python": "/usr/bin/python"
},
"changed": true,
"path": "/var/lib/etcd/member/",
"state": "absent"
}
192.168.1.200 | CHANGED => {
"ansible_facts": {
"discovered_interpreter_python": "/usr/bin/python"
},
"changed": true,
"path": "/var/lib/etcd/member/",
"state": "absent"
}
4:将备份的etcd数据文件同步到每个etcd节点上
[root@master ansible]# for i in ; do rsync -av /backup/k8s1 192.168..$i:/backup/; done
sending incremental file list
created directory /backup
k8s1/
k8s1/admin-key.pem
k8s1/admin.pem
k8s1/aggregator-proxy-csr.json
k8s1/aggregator-proxy-key.pem
k8s1/aggregator-proxy.csr
k8s1/aggregator-proxy.pem
k8s1/ca-config.json
k8s1/ca-key.pem
k8s1/ca.pem
k8s1/kubelet-csr.json
k8s1/kubelet-key.pem
k8s1/kubelet.csr
k8s1/kubelet.pem
k8s1/kubernetes-csr.json
k8s1/kubernetes-key.pem
k8s1/kubernetes.csr
k8s1/kubernetes.pem
k8s1/snapshot.db sent ,, bytes received bytes ,239.60 bytes/sec
total size is ,, speedup is 1.00
sending incremental file list
created directory /backup
k8s1/
k8s1/admin-key.pem
k8s1/admin.pem
k8s1/aggregator-proxy-csr.json
k8s1/aggregator-proxy-key.pem
k8s1/aggregator-proxy.csr
k8s1/aggregator-proxy.pem
k8s1/ca-config.json
k8s1/ca-key.pem
k8s1/ca.pem
k8s1/kubelet-csr.json
k8s1/kubelet-key.pem
k8s1/kubelet.csr
k8s1/kubelet.pem
k8s1/kubernetes-csr.json
k8s1/kubernetes-key.pem
k8s1/kubernetes.csr
k8s1/kubernetes.pem
k8s1/snapshot.db sent ,, bytes received bytes ,,066.00 bytes/sec
total size is ,, speedup is 1.00
5:在每个etcd节点执行下面数据恢复操作,然后重启etcd
##说明:在/etc/systemd/system/etcd.service找到--inital-cluster etcd1=https://xxxx:2380,etcd2=https://xxxx:2380,etcd3=https://xxxx:2380替换恢复命令中的--initial-cluster{ }变量,--name=【当前etcd-node-name】,最后还需要填写当前节点的IP:2380
①【deploy操作】
[root@master ansible]# cd /backup/k8s1/
[root@master k8s1]# ETCDCTL_API= etcdctl snapshot restore snapshot.db --name etcd1 --initial-cluster etcd1=https://192.168.1.200:2380,etcd2=https://192.168.1.202:2380,etcd3=https://192.168.1.203:2380 --initial-cluster-token etcd-cluster-0 --initial-advertise-peer-urls https://192.168.1.200:2380
-- ::50.037127 I | mvcc: restore compact to
-- ::50.052409 I | etcdserver/membership: added member 12229714d8728d0e [https://192.168.1.200:2380] to cluster b8ef796b710cde7d
-- ::50.052451 I | etcdserver/membership: added member 552fb05951af50c9 [https://192.168.1.203:2380] to cluster b8ef796b710cde7d
-- ::50.052474 I | etcdserver/membership: added member 8b4f4a6559bf7c2c [https://192.168.1.202:2380] to cluster b8ef796b710cde7d
执行上面步骤后,会在当前节点目录下,生成一个【node-name】.etcd目录文件
[root@master k8s1]# tree etcd1.etcd/
etcd1.etcd/
└── member
├── snap
│ ├── -.snap
│ └── db
└── wal
└── -.wal
[root@master k8s1]# cp -r etcd1.etcd/member /var/lib/etcd/
[root@master k8s1]# systemctl restart etcd
②【etcd2节点操作】
[root@node1 ~]# cd /backup/k8s1/
[root@node1 k8s1]# ETCDCTL_API= etcdctl snapshot restore snapshot.db --name etcd2 --initial-cluster etcd1=https://192.168.1.200:2380,etcd2=https://192.168.1.202:2380,etcd3=https://192.168.1.203:2380 --initial-cluster-token etcd-cluster-0 --initial-advertise-peer-urls https://192.168.1.202:2380
-- ::35.175032 I | mvcc: restore compact to
-- ::35.232386 I | etcdserver/membership: added member 12229714d8728d0e [https://192.168.1.200:2380] to cluster b8ef796b710cde7d
-- ::35.232507 I | etcdserver/membership: added member 552fb05951af50c9 [https://192.168.1.203:2380] to cluster b8ef796b710cde7d
-- ::35.232541 I | etcdserver/membership: added member 8b4f4a6559bf7c2c [https://192.168.1.202:2380] to cluster b8ef796b710cde7d
[root@node1 k8s1]# tree etcd2.etcd/
etcd2.etcd/
└── member
├── snap
│ ├── -.snap
│ └── db
└── wal
└── -.wal
[root@node1 k8s1]# cp -r etcd1.etcd/member /var/lib/etcd/
[root@node1 k8s1]# systemctl restart etcd
③【etcd3节点操作】
[root@node2 ~]# cd /backup/k8s1/
[root@node2 k8s1]# ETCDCTL_API= etcdctl snapshot restore snapshot.db --name etcd3 --initial-cluster etcd1=https://192.168.1.200:2380,etcd2=https://192.168.1.202:2380,etcd3=https://192.168.1.203:2380 --initial-cluster-token etcd-cluster-0 --initial-advertise-peer-urls https://192.168.1.203:2380
-- ::55.943364 I | mvcc: restore compact to
-- ::55.988674 I | etcdserver/membership: added member 12229714d8728d0e [https://192.168.1.200:2380] to cluster b8ef796b710cde7d
-- ::55.988726 I | etcdserver/membership: added member 552fb05951af50c9 [https://192.168.1.203:2380] to cluster b8ef796b710cde7d
-- ::55.988754 I | etcdserver/membership: added member 8b4f4a6559bf7c2c [https://192.168.1.202:2380] to cluster b8ef796b710cde7d
[root@node2 k8s1]# tree etcd3.etcd/
etcd3.etcd/
└── member
├── snap
│ ├── -.snap
│ └── db
└── wal
└── -.wa
[root@node2 k8s1]# cp -r etcd1.etcd/member /var/lib/etcd/
[root@node2 k8s1]# systemctl restart etcd
6:在deploy节点上操作重建网络
[root@master ansible]# cd /etc/ansible/
[root@master ansible]# ansible-playbook tools/change_k8s_network.yml
7:查看pod、svc恢复是否成功
[root@master ansible]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.68.0.1 <none> /TCP 5d5h
nginx ClusterIP 10.68.241.175 <none> /TCP 5d4h
tomcat ClusterIP 10.68.235.35 <none> /TCP 76m
[root@master ansible]# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-7c45b84548-4998z / Running 5d4h
tomcat-8fc9f5995-9kl5b / Running 77m
三、自动备份、自动恢复
1:一键备份
[root@master ansible]# ansible-playbook /etc/ansible/.backup.yml
2:模拟故障
[root@master ansible]# ansible-playbook /etc/ansible/.clean.yml
修改文件/etc/ansible/roles/cluster-restore/defaults/main.yml,指定要恢复的etcd快照备份,如果不修改就是最新的一次
3:执行自动恢复操作
[root@master ansible]# ansible-playbook /etc/ansible/.restore.yml
[root@master ansible]# ansible-playbook /etc/ansible/tools/change_k8s_network.yml
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