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Backup MySQL Databases in Kubernetes
In this post, we will show you how to create a MySQL server backup using Kubernetes CronJobs.
In our case, we do not have a managed MySQL server. But we want to backup it to our NAS, so that we have a backup in case of emergency.
For this we first build a container that can execute our tasks, because we will certainly need several tasks to backup our cluster.
CronJob Agent Container
First, we'll show you our Dockerfile so you know what we need.
FROM alpine:3.10# UpdateRUN apk --update add --no-cache bash nodejs-current yarn curl busybox-extras vim rsync git mysql-client openssh-client RUN curl -LO https://storage.googleapis.com/kubernetes-release/release/v1.18.0/bin/linux/amd64/kubectl && chmod +x ./kubectl && mv ./kubectl /usr/local/bin/kubectl# ScriptsRUN mkdir /srv/jobsCOPY jobs/* /srv/jobs/# Backup FolderRUN mkdir /var/backupRUN mkdir /var/backup/mysql
Backup Script
And now our backup script which the container executes.
Our script is quite simple, we get all tables with the mysql client, export them as sql file, pack them in a zip file and send them in a 8 hours interval to our NAS.
#!/bin/bash############# SET VARIABLES ############## Env VariablesBACKUPSERVER="8.8.8.8" # Backup Server IpBACKUPDIR=/var/backup/mysqlBACKUPREMOTEDIR="/mnt/backup/kubernetes/"HOST="mariadb.default"NOW="$(date +"%Y-%m-%d")"STARTTIME=$(date +"%s")USER=mysqlUserPASS=mysqlPassword############# BUILD ENVIROMENT ############## Check if temp Backup Directory is emptymkdir $BACKUPDIRif [ "$(ls -A $BACKUPDIR)" ]; then echo "Take action $BACKUPDIR is not Empty" rm -f $BACKUPDIR/*.gz rm -f $BACKUPDIR/*.mysqlelse echo "$BACKUPDIR is Empty"fi############# BACKUP SQL DATABASES #############for DB in $(mysql -u$USER -p$PASS -h $HOST -e 'show databases' -s --skip-column-names); do mysqldump -u$USER -p$PASS -h $HOST --lock-tables=false $DB > "$BACKUPDIR/$DB.sql";done############# ZIP BACKUP #############cd $BACKUPDIRtar -zcvf backup-${NOW}.tar.gz *.sql############# MOVE BACKUP TO REMOTE #############rsync -avz $BACKUPDIR/backup-${NOW}.tar.gz root@$BACKUPSERVER:$BACKUPREMOTEDIR# done
Kubernetes CronJob Deployment
Finally we show you the kubernetes deployment for our agent.
In the deployment, our agent is defined as a CronJob that runs every 8 hours.
In addition, we have added an SSH key as a Conifg map so that this can write to the NAS and a certain security is given.
apiVersion: batch/v1beta1kind: CronJobmetadata: name: backup-mariadb namespace: defaultspec: schedule: "0 8 * * *" successfulJobsHistoryLimit: 1 failedJobsHistoryLimit: 1 jobTemplate: spec: template: spec: containers: - name: cronjob-agent image: xxx/cronjob-agent command: ["bash", "/srv/jobs/backup-mariadb.sh"] volumeMounts: - mountPath: /root/.ssh/id_rsa.pub name: cronjob-default-config subPath: id_rsa.pub - mountPath: /root/.ssh/id_rsa name: cronjob-default-config subPath: id_rsa readOnly: true - mountPath: /root/.ssh/config name: cronjob-default-config subPath: config volumes: - name: cronjob-default-config configMap: name: cronjob-default-config defaultMode: 256 restartPolicy: Never
Original Link: https://dev.to/n00d13/backup-mysql-databases-in-kubernetes-2g6k
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