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一些简单的记录

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备份etcd

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前言

整个k8s诸多组件几乎都是无状态的，所有的数据保存在etcd里，可以说etcd是整个k8s集群的数据库。

具体方案

etcd-backup

https://github.com/giantswarm/etcd-backup

将etcdctl 修改为线上实际的版本。

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FROM alpine:3.8

RUN apk add --no-cache curl

# Get etcdctl
ENV ETCD_VER=v3.2.24
RUN \
  cd /tmp && \
  curl -L https://storage.googleapis.com/etcd/${ETCD_VER}/etcd-${ETCD_VER}-linux-amd64.tar.gz | \
  tar xz -C /usr/local/bin --strip-components=1

COPY ./etcd-backup /
ENTRYPOINT ["/etcd-backup"]
CMD ["-h"]

k8s

选择k8s中的cronjob比较合适，备份策略是每三小时备份一次。

cronjob.yaml

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apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: etcd-backup
  namespace: kube-system
spec:
  schedule: "0 */4 * * *"
  successfulJobsHistoryLimit: 2
  failedJobsHistoryLimit: 2
  jobTemplate:
    spec:
      # Job timeout
      activeDeadlineSeconds: 300
      template:
        spec:
          tolerations:
          # Tolerate master taint
          - key: node-role.kubernetes.io/master
            operator: Exists
            effect: NoSchedule
          # Container creates etcd backups.
          # Run container in host network mode on G8s masters
          # to be able to use 127.0.0.1 as etcd address.
          # For etcd v2 backups container should have access
          # to etcd data directory. To achive that,
          # mount /var/lib/etcd3 as a volume.
          nodeSelector:
            node-role.kubernetes.io/master: ""
          containers:
          - name: etcd-backup
            image: iyacontrol/etcd-backup:0.1
            args:
            # backup guest clusters only on production instalations
            # testing installation can have many broken guest clusters
            - -prefix=k8s-prod-1
            - -etcd-v2-datadir=/var/lib/etcd
            - -etcd-v3-endpoints=https://172.xx.xx.221:2379,https://172.xx.xx.83:2379,https://172.xx.xx.246:2379
            - -etcd-v3-cacert=/certs/ca.crt
            - -etcd-v3-cert=/certs/server.crt
            - -etcd-v3-key=/certs/server.key
            - -aws-s3-bucket=mybucket
            - -aws-s3-region=us-east-1
            volumeMounts:
            - mountPath: /var/lib/etcd
              name: etcd-datadir
            - mountPath: /certs
              name: etcd-certs
            env:
              - name: ETCDBACKUP_AWS_ACCESS_KEY
                valueFrom:
                  secretKeyRef:
                    name: etcd-backup
                    key: ETCDBACKUP_AWS_ACCESS_KEY
              - name: ETCDBACKUP_AWS_SECRET_KEY
                valueFrom:
                  secretKeyRef:
                    name: etcd-backup
                    key: ETCDBACKUP_AWS_SECRET_KEY
              - name: ETCDBACKUP_PASSPHRASE
                valueFrom:
                  secretKeyRef:
                    name: etcd-backup
                    key: ETCDBACKUP_PASSPHRASE
          volumes:
          - name: etcd-datadir
            hostPath:
              path: /var/lib/etcd
          - name: etcd-certs
            hostPath:
              path: /etc/kubernetes/pki/etcd/
          # Do not restart pod, job takes care on restarting failed pod.
          restartPolicy: Never
          hostNetwork: true

注意：容忍 和 nodeselector配合，让pod调度到master节点上。

secret.yaml

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apiVersion: v1
kind: Secret
metadata:
  name: etcd-backup
  namespace: kube-system
type: Opaque
data:
  ETCDBACKUP_AWS_ACCESS_KEY: QUtJTI0TktCT0xQRlEK
  ETCDBACKUP_AWS_SECRET_KEY: aXJ6eThjQnM2MVRaSkdGMGxDeHhoeFZNUDU4ZGRNbgo=
  ETCDBACKUP_PASSPHRASE: ""