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Code Block

language	text
title	db_backup.sh

#!/bin/sh

FILENAME=$(basename $0 .sh)
BACKUP_TS=$(date +%F-%T)
ARCHIVE=${FILENAME}_${BACKUP_TS}.tar.gz
ERRFILE=${FILENAME}_${BACKUP_TS}.err
DMPFILE=${FILENAME}_${BACKUP_TS}.dmp
LOG_DIR=/tmp
BACKUP_WORKDIR=/tmp
BACKUP_ARCHIVEDIR=/tmp
MARIADB_BACKUP_EXE_DIR="/usr/bin"
DB_USER=backup
DB_PWD=******
HOST=host.docker.internal
PORT=3355

# cleanup old backups
removeOldBackups()
{
# remove backups older than -mmin for minutes, -mtime for days
echo "Removing old backups ..."
for i in `find $BACKUP_ARCHIVEDIR/*.tar.gz $BACKUP_ARCHIVEDIR/*.dmp $BACKUP_ARCHIVEDIR/*.err \
          2>/dev/null -type f -mmin +60${BACKUP_RETENTION_INTERVAL} +${BACKUP_RETENTION_PERIOD} -ls | grep -o '\S\+$'`
do
        echo "Removing $i"
        rm $i >/dev/null 2>/dev/null
done
}

cd /

echo "Backup Started"

# call backup utility
{
"$MARIADB_BACKUP_EXE_DIR"/mysqldump --all-databases --host=$HOST$DB_HOST --port=$PORT$DB_PORT \
                                    --user=$DB_USER --password=$DB_PWD \
                                    --log-error=/tmp/$ERRFILE  > /tmp/$DMPFILE
}

# create a tar archive from the backup directory
tar cvzf $BACKUP_ARCHIVEDIR/$ARCHIVE $BACKUP_WORKDIR/$DMPFILE \
         $BACKUP_WORKDIR/$ERRFILE >/dev/null 2>/dev/null

# check for errors
if [ -s "$BACKUP_WORKDIR/$ERRFILE" ]
then
   rm $BACKUP_ARCHIVEDIR/$ARCHIVE >/dev/null 2>/dev/null
   cat $BACKUP_WORKDIR/$ERRFILE | xargs echo -e
   echo "Backup Completed With Errors"
   exit 1
else
   rm $BACKUP_WORKDIR/$DMPFILE \
      $BACKUP_WORKDIR/$ERRFILE >/dev/null 2>/dev/null
   removeOldBackups
   echo "Backup Completed Successfully"
   exit 0
fi

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The kubernetes cron can be created using the following 3 files:helm.

The helm directory will look like this:

ls mariadb-backup/
Chart.yaml charts templates values.yaml

ls mariadb-backup/templates/
backupCronjob.yaml backupPersistentVolume.yaml
backupConfigMap.yaml backupPersistentClaim.yaml backupSecret.yaml

Code Block

language	yml
title	Chart.yaml

apiVersion: v2
name: mariadb-backup
description: A Helm chart for Kubernetes

# A chart can be either an 'application' or a 'library' chart.
#
# Application charts are a collection of templates that can be packaged into versioned archives
# to be deployed.
#
# Library charts provide useful utilities or functions for the chart developer. They're included as
# a dependency of application charts to inject those utilities and functions into the rendering
# pipeline. Library charts do not define any templates and therefore cannot be deployed.
type: application

# This is the chart version. This version number should be incremented each time you make changes
# to the chart and its templates, including the app version.
# Versions are expected to follow Semantic Versioning (https://semver.org/)
version: 0.1.0

# This is the version number of the application being deployed. This version number should be
# incremented each time you make changes to the application. Versions are not expected to
# follow Semantic Versioning. They should reflect the version the application is using.
# It is recommended to use it with quotes.
appVersion: "1.16.0"

echo -n '<string>' | base64 to convert your db_user and db_pwd to base64 encoding

Code Block

language	yml
title	values.yaml

# Default values for mariadb-backup.
# This is a YAML-formatted file.
# Declare variables to be passed into your templates.
image:
  repository: "ktimoney/mysqldump_backup"
backoffLimit: 3
schedule: "\"*/15 * * * *\""
volumes:
  name: backup-pv
  storageClassName:
    path: /run/desktop/mnt/host/c/mariadb/backup
    accessModes: ReadWriteOnce
  capacity:
    storage: 50Mi
  persistentVolumeReclaimPolicy: Retain
  nodeAffinity:
    nodeSelectorTerms: docker-desktop
data:
  backup_retention_interval: mmin # mmin for minutes, mtime for days
  backup_retention_period: "\"120\""
  db_host: host.docker.internal
  db_port: "\"3355\""
  db_user: YmFja3Vw
  db_pwd: YmFja3Vw

Code Block

language	yml
title	backupPersistentVolume.yaml

apiVersion: v1
kind: PersistentVolume
metadata:
  name: local-pv {{ .Values.volumes.name }}
spec:
  capacity:
    storage: 50Mi {{ .Values.volumes.capacity.storage }}
  volumeMode: Filesystem
  accessModes:
    - ReadWriteMany {{ .Values.volumes.storageClassName.accessModes }}
  persistentVolumeReclaimPolicy: Retain
  storageClassName: local-storage
  local:
    path: /run/desktop/mnt/host/c/mariadb/backup {{ .Values.volumes.storageClassName.path }}
  nodeAffinity:
    required:
      nodeSelectorTerms:
        - matchExpressions:
            - key: kubernetes.io/hostname
              operator: In
              values:
                - docker-desktop

...

 {{ .Values.volumes.nodeAffinity.nodeSelectorTerms }}

Code Block

language	yml
title	backupPersistentClaim.yaml

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: backup-claim
spec:
  storageClassName: local-storage
  accessModes:
    - ReadWriteMany {{ .Values.volumes.storageClassName.accessModes }}
  resources:
    requests:
      storage: 50Mi

kubectl create -f backupPersistentClaim.yaml

 {{ .Values.volumes.capacity.storage }}

Code Block

language	yml
title	backupConfigMap.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: backup-config
  namespace: default
data:
  backup_retention_interval: {{ .Values.data.backup_retention_interval }}
  backup_retention_period: {{ .Values.data.backup_retention_period }}
  db_host: {{ .Values.data.db_host }}
  db_port: {{ .Values.data.db_port }}

Code Block

language	yml
title	backupSecret.yaml

apiVersion: v1
kind: Secret
metadata:
  name: backup-secret
type: Opaque
data:
  db_user: {{ .Values.data.db_user }}
  db_pwd: {{ .Values.data.db_pwd }}

Code Block

language	yml
title	backupCronjob.yaml

apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: batch-every-10-minutesbackup-cron
spec:
  schedule: "*/10 * * * *"
  {{ .Values.schedule }}
  concurrencyPolicy: Forbid
  jobTemplate:
    spec:
      template:
        spec:
          volumes:
            - name: backup-volume
              persistentVolumeClaim:
                claimName: backup-claim
          containers:
          - name: mysqldump-backup
            image: ktimoney/mysqldump_backup {{ .Values.image.repository }}
            volumeMounts:
            - mountPath: "/tmp"
              name: backup-volume
            env:
            - name: DB_HOST
              valueFrom:
                configMapKeyRef:
                  name: backup-config
                  key: db_host
            - name: DB_PORT
              valueFrom:
                configMapKeyRef:
                  name: backup-config
                  key: db_port
            - name: BACKUP_RETENTION_INTERVAL
              valueFrom:
                configMapKeyRef:
                  name: backup-config
                  key: backup_retention_interval
            - name: BACKUP_RETENTION_PERIOD
              valueFrom:
                configMapKeyRef:
                  name: backup-config
                  key: backup_retention_period
            - name: DB_USER
              valueFrom:
                secretKeyRef:
                  name: backup-secret
                  key: db_user
            - name: DB_PWD
              valueFrom:
                secretKeyRef:
                  name: backup-secret
                  key: db_pwd
          restartPolicy: Never
      backoffLimit: 3 {{ .Values.backoffLimit }}

Run helm install mariadb-backup-t1 ./mariadb-backup to install

Run helm list to get the name and chart

Run helm upgrade mariadb-backup-t1 mariadb-backup to update

Run helm uninstall mariadb-backup-t1 to remove

* backoffLimit sets the number of times (+1) the cron will retry the job before it stopskubectl create -f backupCronjob.yaml

This will back up the local copy of mariadb every 10 minutes to the c:\mariadb\backup folder.

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