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+++
+title = "Backup MySQL Databases in Kubernetes"
+date = 2021-03-03
+updated = 2021-03-03
+description = "In this post, we will show you how to create a MySQL server backup using Kubernetes CronJobs."
+
+[taxonomies]
+tags = ["docker", "kubernetes", "cronjob", "bash", "backup"]
+
+[extra]
+toc = false
+quick_navigation_buttons = true
+++
+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.
+
+```Dockerfile
+FROM alpine:3.10
+
+# Update
+RUN 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
+
+# Scripts
+RUN mkdir /srv/jobs
+COPY jobs/* /srv/jobs/
+
+# Backup Folder
+RUN mkdir /var/backup
+RUN 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.
+
+```bash
+#!/bin/bash
+
+############# SET VARIABLES #############
+
+# Env Variables
+BACKUPSERVER="8.8.8.8" # Backup Server Ip
+BACKUPDIR=/var/backup/mysql
+BACKUPREMOTEDIR="/mnt/backup/kubernetes/"
+HOST="mariadb.default"
+NOW="$(date +"%Y-%m-%d")"
+STARTTIME=$(date +"%s")
+USER=mysqlUser
+PASS=mysqlPassword
+
+
+############# BUILD ENVIROMENT #############
+# Check if temp Backup Directory is empty
+mkdir $BACKUPDIR
+
+if [ "$(ls -A $BACKUPDIR)" ]; then
+    echo "Take action $BACKUPDIR is not Empty"
+    rm -f $BACKUPDIR/*.gz
+    rm -f $BACKUPDIR/*.mysql
+else
+    echo "$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 $BACKUPDIR
+tar -zcvf backup-${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.
+
+```yaml
+apiVersion: batch/v1beta1
+kind: CronJob
+metadata:
+  name: backup-mariadb
+  namespace: default
+spec:
+  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
+```