backup_database.sh

#!/bin/bash

# This backup script creates nightly database and media file backups of the BuildingSync website when running
# in a docker container. The name of the container running the database is hardcoded to look for
# *db-postgres*. This may cause an issue if several docker applications are running on the same
# system. Also, the location of the backups is hardcoded to ~/buildingsync-website-backups.

# To create nightly backups, add the following to your crontab
# 0 0 * * * /srv/buildingsync-website/backup_database.sh <db_name> <db_username> >> /home/ubuntu/buildingsync-website-backups/cron.log 2>&1

DB_NAME=$1
DB_USERNAME=$2

function file_name(){
    echo ${BACKUP_DIR}/${DB_NAME}_$(date '+%Y%m%d_%H%M%S').dump
}

function media_file_name(){
    echo /backup/dir/${DB_NAME}_media_$(date '+%Y%m%d_%H%M%S').tgz
}

if [[ (-z ${DB_NAME}) || (-z ${DB_USERNAME}) ]] ; then
    echo "Expecting command to be of form ./backup_database.sh <db_name> <db_username>"
    exit 1
fi

# currently the backup directory is hard coded
BACKUP_DIR=/home/ubuntu/buildingsync-website-backups
mkdir -p ${BACKUP_DIR}

# db_password is set from the environment variables in docker-compose. The docker stack must
# be running for this command to work.
echo "docker exec $(docker ps -f "name=buildingsyncwebsite_db-postgres" --format "{{.ID}}") pg_dump -U ${DB_USERNAME} -Fc ${DB_NAME} > $(file_name)"
docker exec $(docker ps -f "name=buildingsyncwebsite_db-postgres" --format "{{.ID}}") pg_dump -U ${DB_USERNAME} -Fc ${DB_NAME} > $(file_name)

# Backup the media directory (uploads, especially buildingsync). In docker-land this is
# just a container volume, so create a new container with the volume attached and tar it up.
echo "docker run --rm -it -v buildingsync_media:/backup/media -v $BACKUP_DIR:/backup/dir/ alpine:3.8 tar zcvf $(media_file_name) /backup/media"
docker run --rm -v buildingsync_media:/backup/media -v $BACKUP_DIR:/backup/dir/ alpine:3.8 tar zcvf $(media_file_name) /backup/media

# Delete files older than 30 days.
find ${BACKUP_DIR} -mtime +30 -type f -name '*.dump' -delete
find ${BACKUP_DIR} -mtime +30 -type f -name '*.tgz' -delete