Backup ETCD Script

Objetive

Run ETCD backup in this time or schedule a ETCD backup using CRONJOB on kubernetes.

Configure CRONJOB

Inside the manifest of cronjob you can change the schedule date on spec.schedule

Its important to use the correct sintax of time.

refer -> https://kubernetes.io/docs/concepts/workloads/controllers/cron-jobs/

apiVersion: batch/v1
kind: CronJob
metadata:
  name: backup-etcd
  namespace: kube-system
spec:
  schedule: 30 14 * * 3 # -------> This field you can costumize the schedule time to run the job on kubernetes” 
  jobTemplate:
    spec:
      template:
        spec:
          serviceAccountName: kubectl-backup
          containers:
          - name: backup-etcd
            image: bitnami/kubectl
            imagePullPolicy: IfNotPresent
            command:
              - /bin/bash
              - -c
              - |
                kubectl exec -n kube-system \
                $(kubectl get pod -n kube-system \
                -o=jsonpath='{.items[*].metadata.name}' | \
                sed 's/[[:space:]]/\n/g' | \
                grep '^etcd') -- sh -c "ETCDCTL_API=3 \
                ETCDCTL_CACERT=/etc/kubernetes/pki/etcd/ca.crt \
                ETCDCTL_CERT=/etc/kubernetes/pki/etcd/server.crt \
                ETCDCTL_KEY=/etc/kubernetes/pki/etcd/server.key \
                etcdctl --endpoints=https://127.0.0.1:2379 \
                snapshot save /var/lib/etcd/snapshot.db"
          restartPolicy: OnFailure

Execute the script

sudo chmod +x backup.sh
sudo ./backup.sh