docker-wordpress-backup.sh

#!/bin/bash

#
# Backup database and files of a Wordpress blog running in a Docker container
#
# by Sergei Sokolov hello@sergeisokolov.com
# Moscow, 2016 September 08
#

DC_MYSQL=dockerwp_mysql_1
DC_FILES=dockerwp_wordpress_1
DEST=/path/to/backups/on/host

DATETIME=$(date +%Y%m%d-%H%M%S)

BKP_MYSQL="${DATETIME}.sql.gz"
BKP_FILES="${DATETIME}.tgz"

TMP_MYSQL="/tmp/${BKP_MYSQL}"
TMP_FILES="/tmp/${BKP_FILES}"



# DATABASE

# 1. dump inside Docker
sudo docker exec $DC_MYSQL bash -c "mysqldump  -u root  -p\$MYSQL_ROOT_PASSWORD  wordpress | gzip > $TMP_MYSQL"

# 2. copy to host
sudo docker cp "$DC_MYSQL:$TMP_MYSQL"  "$DEST/"

# 3. remove temp file inside Docker
sudo docker exec $DC_MYSQL rm -f "$TMP_MYSQL"


# FILES

# 1. create a zipped tar ball inside Docker container
sudo docker exec $DC_FILES bash -c "tar -czf $TMP_FILES  . "

# 2. copy the tarball from Docker container to host
sudo docker cp "$DC_FILES:$TMP_FILES"  "$DEST/"

# 3. remove temp file inside Docker
sudo docker exec $DC_FILES rm -f "$TMP_FILES"


# Verify

ls -lA $DEST