I have a small instance of influxdb running in my kubernetes cluster.<br> The data of that instance is stored in a persistent storage.<br> But I also want to run the backup command from influx at scheduled interval.<br>
influxd backup -portable /backuppathWhat I do now is exec into the pod and run it manually.<br> Is there a way that I can do this automatically?
You can either run it as a cronjob and setup the image to be able to connect to the DB, or you can sidecar it alongside your db pod, and set it to run the cron image (i.e. will run as a mostly-idle container in the same pod as your DB)
CronJob is the way to go here. It acts more or less like a crontab, but for Kubernetes.
As an example you could use this
apiVersion: batch/v1
kind: CronJob
metadata:
name: backup
spec:
schedule: 0 8 * * *
jobTemplate:
spec:
template:
spec:
containers:
- name: influxdb-backup
image: influxdb
imagePullPolicy: IfNotPresent
command: ["/bin/sh"]
args:
- "-c"
- "influxd backup -portable /backuppath"
restartPolicy: NeverThis will create a Job, everyday at 08:00, executing influxd backup -portable /backuppath. Of course, you have to edit it accordingly, to work on your environment.
This is the solution I have used for this question
apiVersion: v1
kind: ConfigMap
metadata:
name: cm-backupscript
namespace: influx
data:
backupscript.sh: |
#!/bin/bash
echo 'getting pod name'
podName=$(kubectl get pods -n influx --field-selector=status.phase==Running --output=jsonpath={.items..metadata.name})
echo $podName
#echo 'create backup'
kubectl exec -it $podName -n influx -- /mnt/influxBackupScript/influxbackup.sh
echo 'done'
---
apiVersion: batch/v1beta1
kind: CronJob
metadata:
name: backup-cron
namespace: influx
spec:
schedule: "0 2 * * *"
jobTemplate:
spec:
template:
spec:
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/arch
operator: In
values:
- amd64
volumes:
- name: backup-script
configMap:
name: cm-backupscript
defaultMode: 0777
containers:
- name: kubectl
image: bitnami/kubectl:latest
command:
- /bin/sh
- -c
- /mnt/scripts/backupscript.sh
volumeMounts:
- name: backup-script
mountPath: "/mnt/scripts"
restartPolicy: NeverYou can consider running a CronJob with bitnami kubectl which will execute the backup command. This is the same as exec into the pod and run except now you automate it with CronJob.