Postgresbackup

postgres-backup/Dockerfile

+FROM registry.picasoft.net:5000/pica-debian
+MAINTAINER antoine@barbare.me
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends postgresql-client cron && \
+    apt-get clean && \
+    mkdir /backup
+
+ENV CRON_TIME="0 0 * * *" 
+ADD run.sh /run.sh
+VOLUME ["/backup"]
+
+CMD ["/run.sh"]

postgres-backup/README.md

+# postgres-backup
+
+This image runs postgresdump to backup data using cronjob to folder `/backup`
+
+## Usage:
+
+    docker run -d \
+        --env POSTGRES_HOST=postgres.host \
+        --env POSTGRES_PORT=27017 \
+        --env POSTGRES_USER=admin \
+        --env POSTGRES_PASS=password \
+        --volume host.folder:/backup
+        tutum/postgres-backup
+
+## Parameters
+
+    POSTGRES_HOST      the host/ip of your postgres database
+    POSTGRES_PORT      the port number of your postgres database
+    POSTGRES_USER      the username of your postgres database
+    POSTGRES_PASS      the password of your postgres database
+    CRON_TIME       the interval of cron job to run postgresdump. `0 0 * * *` by default, which is every day at 00:00
+    POSTGRES_DB     the DB to backup
+    MAX_BACKUPS     the number of backups to keep. When reaching the limit, the old backup will be discarded. No limit by default
+    INIT_BACKUP     if set, create a backup when the container starts
+    INIT_RESTORE_LATEST if set, restores latest backup
+
+## Restore from a backup
+
+See the list of backups, you can run:
+
+    docker exec postgres-backup ls /backup
+
+To restore database from a certain backup, simply run:
+
+    docker exec tutum-backup /restore.sh /backup/2015.08.06.171901

postgres-backup/run.sh

+#!/bin/bash
+
+[ -z "${POSTGRES_HOST}" ] && { echo "=> POSTGRES_HOST cannot be empty" && exit 1; }
+[ -z "${POSTGRES_PORT}" ] && { echo "=> POSTGRES_PORT cannot be empty" && exit 1; }
+[ -z "${POSTGRES_USER}" ] && { echo "=> POSTGRES_USER cannot be empty" && exit 1; }
+[ -z "${POSTGRES_PASS}" ] && { echo "=> POSTGRES_PASS cannot be empty" && exit 1; }
+[ -z "${POSTGRES_DB}" ] && { echo "=> POSTGRES_DB cannot be empty" && exit 1; }
+
+BACKUP_CMD="pg_dump -w -c > /backup/"'${BACKUP_NAME}'
+
+echo "=> Creating backup script"
+rm -f /backup.sh
+cat <<EOF >> /backup.sh
+#!/bin/bash
+MAX_BACKUPS=${MAX_BACKUPS}
+export PGHOST=$POSTGRES_HOST
+export PGPORT=$POSTGRES_PORT
+export PGDATABASE=$POSTGRES_DB
+export PGUSER=$POSTGRES_USER
+export PGPASSWORD=$POSTGRES_PASS
+
+BACKUP_NAME=\$(date +\%Y.\%m.\%d.\%H\%M\%S).sql
+
+echo "=> Backup started: \${BACKUP_NAME}"
+if ${BACKUP_CMD} ;then
+    echo "   Backup succeeded"
+else
+    echo "   Backup failed"
+    rm -rf /backup/\${BACKUP_NAME}
+fi
+
+if [ -n "\${MAX_BACKUPS}" ]; then
+    while [ \$(ls /backup -N1 | wc -l) -gt \${MAX_BACKUPS} ];
+    do
+        BACKUP_TO_BE_DELETED=\$(ls /backup -N1 | sort | head -n 1)
+        echo "   Backup \${BACKUP_TO_BE_DELETED} is deleted"
+        rm -rf /backup/\${BACKUP_TO_BE_DELETED}
+    done
+fi
+echo "=> Backup done"
+EOF
+chmod +x /backup.sh
+
+echo "=> Creating restore script"
+rm -f /restore.sh
+cat <<EOF >> /restore.sh
+#!/bin/bash
+export PGHOST=$POSTGRES_HOST
+export PGPORT=$POSTGRES_PORT
+export PGDATABASE=$POSTGRES_DB
+export PGUSER=$POSTGRES_USER
+export PGPASSWORD=$POSTGRES_PASS
+
+echo "=> Restore database from \$1"
+if pg_restore -w -d $POSTGRES_DB < \$1 ;then
+    echo "   Restore succeeded"
+else
+    echo "   Restore failed"
+fi
+echo "=> Done"
+EOF
+chmod +x /restore.sh
+
+touch /postgres_backup.log
+tail -F /postgres_backup.log &
+
+if [ -n "${INIT_BACKUP}" ]; then
+    echo "=> Create a backup on the startup"
+    /backup.sh
+elif [ -n "${INIT_RESTORE_LATEST}" ]; then
+    echo "=> Restore lates backup"
+    until nc -z $POSTGRES_HOST $POSTGRES_PORT
+    do
+        echo "waiting database container..."
+        sleep 1
+    done
+    ls -d -1 /backup/* | tail -1 | xargs /restore.sh
+fi
+
+echo "${CRON_TIME} /backup.sh >> /postgres_backup.log 2>&1" > /crontab.conf
+crontab  /crontab.conf
+echo "=> Running cron job"
+exec cron -f