kubernetes中部署的应用的信息都存放在etcd里面，这里面的数据很是重要，须要备份，以备不时之需。html
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）。node
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