k8s安装之etcd备份还原yaml

etcd备份还原方案,这种比较高级。

使用docker,自动化处理。

如果单节点备份,ETCD_ENDPOINTS一个即可。

如果多节点恢复,依次执行恢复脚本即可。

apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: backup
  namespace: kube-system
spec:
  # activeDeadlineSeconds: 100
  schedule: "0 0 * * *"
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: backup
            # Same image as in /etc/kubernetes/manifests/etcd.yaml
            image: harbor.xxx.cn/3rd_part/k8s.gcr.io/etcd:3.3.10
            env:
            - name: ETCDCTL_API
              value: "3"
            - name: ETCD_ENDPOINTS
              value: "https://1.1:2379,https://1.2:2379,https://1.3:2379"
            command: ["/bin/sh"]
            args: ["-c", "etcdctl --endpoints=${ETCD_ENDPOINTS} --cacert=/etc/kubernetes/pki/etcd/ca.crt --cert=/etc/kubernetes/pki/etcd/healthcheck-client.crt --key=/etc/kubernetes/pki/etcd/healthcheck-client.key snapshot save /backup/etcd-ha-snapshot-$(date +%Y-%m-%d_%H:%M:%S_%Z).db"]
            volumeMounts:
            - mountPath: /etc/kubernetes/pki/etcd
              name: etcd-certs
              readOnly: true
            - mountPath: /backup
              name: backup
          restartPolicy: OnFailure
          nodeSelector:
            node-role.kubernetes.io/master: ""
          tolerations:
          - key: "node-role.kubernetes.io/master"
            effect: "NoSchedule"
          hostNetwork: true
          volumes:
          - name: etcd-certs
            hostPath:
              path: /etc/kubernetes/pki/etcd
              type: DirectoryOrCreate
          - name: backup
            hostPath:
              path: /tmp/etcd_backup/
              type: DirectoryOrCreate

主要参考url:

https://www.cnblogs.com/chenqionghe/p/10622859.html

相当于把c,etcd单节点数据恢复操作三次即可。但要注意,在作数据恢复之前,千万一定肯定要停掉整个etcd集群的服务!!!!切记切记切记!!!!并且要平时或是找一个类似环境演练,作到胆大心细!!!

    如果已有备份数据,在只有etcd数据损坏的下,可根据以下步骤进行恢复。

1, 将/etc/kubernetes/manifests/ kube-apiserver.yaml文件里的镜像版本更改,停止kube-api server服务。

2, 将/etc/kubernetes/manifests/ etcd.yaml文件里的镜像版本更改,停止etcd server服务。

3, 运行如下命令,将损坏的数据文件移至其它地方。

mv /var/lib/etcd/* /tmp/

4, 运行以下命令,以临时docker运行的方式,将数据从备份里恢复到/var/lib/etcd/。

docker run --rm \

    -v '/tmp:/backup' \

    -v '/var/lib/etcd:/var/lib/etcd' \

    --env ETCDCTL_API=3 \

    'k8s.gcr.io/etcd-amd64:3.1.12' \

/bin/sh -c "etcdctl snapshot restore '/backup/etcd-snapshot-xxx_UTC.db' ; mv /default.etcd/member/ /var/lib/etcd/"

[上面的命令中,假定我们已将待还原数据放置于/tmp/目录下]

5, 改回/etc/kubernetes/manifests/kube-apiserver.yaml文件里的镜像版本,恢复etcd server服务。

6, 改回/etc/kubernetes/manifests/etcd.yaml文件里的镜像版本,恢复kube-api server服务。

转载于:https://www.cnblogs.com/aguncn/p/10905564.html

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