Kubernetes中使用CronJob定时备份etcd集群数据

Kubernetes中使用CronJob定时备份etcd集群数据

• 注意：这里的内容已经过时！
  • 使用kubernetes1.12.3和etcd3.2.24请参考 Kubernetes的etcd探秘-状态数据备份 。

kubernetes中部署的应用的信息都存放在etcd里面，这里面的数据非常重要，需要备份，以备不时之需。

这里使用k8s提供的定时任务来执行备份任务，定时任务的pod要和etcd的pod要在同一个node上面（使用nodeAffinity）。

要求

• kubernetes 1.6
• etcd 3.0.17

yaml文件

apiVersion: batch/v2alpha1
kind: CronJob
metadata:
  name: etcd-disaster-recovery
  namespace: cron
spec:
 schedule: "0 22 * * *"
 jobTemplate:
  spec:
    template:
      metadata:
       labels:
        app: etcd-disaster-recovery
      spec:
        affinity:
          nodeAffinity:
            requiredDuringSchedulingIgnoredDuringExecution:
                  nodeSelectorTerms:
                  - matchExpressions:
                    - key: kubernetes.io/role
                      operator: In
                      values:
                      - master
        containers:
        - name: etcd
          image: coreos/etcd:v3.0.17
          command:
          - sh
          - -c
          - "export ETCDCTL_API=3; \
             etcdctl --endpoints $ENDPOINT snapshot save /snapshot/$(date +%Y%m%d_%H%M%S)_snapshot.db; \
             echo etcd backup sucess"
          env:
          - name: ENDPOINT
            value: "127.0.0.1:2379"
          volumeMounts:
            - mountPath: "/snapshot"
              name: snapshot
              subPath: data/etcd-snapshot
            - mountPath: /etc/localtime
              name: lt-config
            - mountPath: /etc/timezone
              name: tz-config
        restartPolicy: OnFailure
        volumes:
          - name: snapshot
            persistentVolumeClaim:
              claimName: cron-nas
          - name: lt-config
            hostPath:
              path: /etc/localtime
          - name: tz-config
            hostPath:
              path: /etc/timezone
        hostNetwork: true

 

参考

• https://v1-6.docs.kubernetes.io/docs/concepts/workloads/controllers/cron-jobs/
• https://coreos.com/etcd/docs/3.0.17/op-guide/recovery.html
• Kubernetes Master节点 灾备恢复操作指南，https://yq.aliyun.com/articles/561894
• Kubernetes 备份，https://my.oschina.net/u/2306127/blog/2032463

来源：oschina

链接：https://my.oschina.net/u/2306127/blog/2032457