docs: example deployment

.gitignore

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+dockerBuildAndPush.sh

BackupSideCar.Dockerfile

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+FROM alpine:3.17
+
+# Setup correct TZ
+RUN apk add alpine-conf
+RUN /sbin/setup-timezone -z UTC
+
+RUN apk add restic curl
+
+WORKDIR /app
+
+COPY ./src/entry.sh /app/
+COPY ./src/backup.sh /app/
+
+CMD [ "/bin/sh", "entry.sh" ]

README.md

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 # backupsidecar
 
 Backup sidecar that automatically creates backups of one PVC and saves it to another PVC via restic
+
+## Function
+A cronjob inside the container runs in the configured interval creating the backup and purging old backups.
+A notification is sent to gotify on completion of the backup or on error of either the backup or purge.
+
+## Environment Variables
+| ENV Variable | Required |Description| Example Value
+|--------------|----------|--------------|-
+|INTERVAL|yes|cronjob interval string|15 14 * * *|
+|RESTIC_REPOSITORY|yes|path of the restic repository|/mnt/backups/gitea|
+|SOURCEDIR |yes|path of the path to backup|/mnt/toBackup/|
+|KEEPLAST|yes|number of increments to keep (keep in mind that the number of backups to keep correlates with the interval in which they are created) |10|
+|RESTIC_PASSWORD|yes|password for the restic repository|******|
+|RUNONSTART|no|set to true to force a backup at the start of the container|true|
+|GOTIFYHOST|yes|URL of the gotify server (without trailing slash)|https://gotify.example.com|
+|GOTIFYTOKEN|yes|gotify app token|******|
+|GOTIFYTOPIC|yes|gotify topic to include in the notification|gotify|

example-deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: backup-sidecar
+spec:
+  selector:
+    matchLabels:
+      app: backup-sidecar
+  template:
+    metadata:
+      labels:
+        app: backup-sidecar
+    spec:
+      containers:
+        - name: backup-sidecar
+          image: gitea.t000-n.de/t.behrendt/backupsidecar:latest
+          volumeMounts:
+            - mountPath: /mnt/toBackup
+              name: data
+              readOnly: true
+            - mountPath: /mnt/backups/gitea
+              name: nfs-backup
+              subPath: gitea
+          env:
+            - name: INTERVAL
+              value: "15 14 * * *"
+            - name: RESTIC_REPOSITORY
+              value: /mnt/backups/gitea
+            - name: SOURCEDIR
+              value: "/mnt/toBackup/"
+            - name: KEEPLAST
+              value: "100"
+            - name: RESTIC_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: restic-credentials
+                  key: password
+            - name: RUNONSTART
+              value: "false"
+            - name: GOTIFYHOST
+              value: "https://<gotify-URL>"
+            - name: GOTIFYTOKEN
+              valueFrom:
+                secretKeyRef:
+                  name: gotify-credentials
+                  key: token
+            - name: GOTIFYTOPIC
+              value: "gitea"
+      volumes:
+        - name: data
+          persistentVolumeClaim:
+            claimName: data
+        - name: nfs-backup
+          persistentVolumeClaim:
+            claimName: backup-nfs

src/backup.sh

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+#!/bin/sh
+
+GOTIFYURL="$GOTIFYHOST/message?token=$GOTIFYTOKEN"
+
+echo "$(date +"%Y-%m-%dT%T") - Starting backup"
+
+restic backup           \
+    --verbose		\
+    $SOURCEDIR
+
+RESTIC_BACKUP_RETURN=$?
+
+if [ $RESTIC_BACKUP_RETURN -eq 0 ]; then
+    MSG_BACKUP_SUCCESS="Backup successful"
+    echo "$(date +"%Y-%m-%dT%T") - $MSG_BACKUP_SUCCESS"
+    curl -s -X POST "$GOTIFYURL" -F "title=$GOTIFYTOPIC" -F "message=$MSG_BACKUP_SUCCESS"
+else
+    MSG_BACKUP_ERR="Backup failed with error code $RESTIC_BACKUP_RETURN"
+    echo "$(date +"%Y-%m-%dT%T") - MSG_BACKUP_ERR"
+    curl -s -X POST "$GOTIFYURL" -F "title=$GOTIFYTOPIC" -F "message=$MSG_BACKUP_ERR"
+    exit $RESTIC_BACKUP_RETURN
+fi
+
+
+MSG_PURGE_START="$(date +"%Y-%m-%dT%T") - Removing old backups"
+echo $MSG_PURGE_START
+
+restic forget --keep-last $KEEPLAST --prune
+RESTIC_PURGE_RETURN=$?
+
+if [ $RESTIC_PURGE_RETURN -eq 0 ]; then
+    echo "$(date +"%Y-%m-%dT%T") - Purge successful"
+else
+    MSG_PURGE_ERR="Purge failed with error code $MSG_PURGE_ERR"
+    echo "$(date +"%Y-%m-%dT%T") - $MSG_PURGE_ERR"
+    curl -s -X POST "$GOTIFYURL" -F "title=$GOTIFYTOPIC" -F "message=$MSG_PURGE_ERR"
+    exit $RESTIC_PURGE_RETURN
+fi
+
+echo "$(date +"%Y-%m-%dT%T") - Going back to sleep..."

src/entry.sh

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+#!/bin/sh
+
+mkdir /etc/cron.d
+touch /etc/cron.d/backup
+echo "$INTERVAL /bin/sh /app/backup.sh" > /etc/cron.d/backup
+
+# change ownership and make the cron known to crontab
+chmod 0644 /etc/cron.d/backup && crontab /etc/cron.d/backup
+
+
+if [ $RUNONSTART = 'true' ]; then
+    echo $(date +"%Y-%m-%dT%T") "- Running initial backup"
+    /bin/sh /app/backup.sh
+fi
+
+# Wait until infinity
+echo $(date +"%Y-%m-%dT%T") "- Starting cron"
+crond -f