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This project is very old. You're free to base your solution on this project, but I recommend you do not use any previously built images

annixa/pg_dump

Docker image with pg_dump running as a cron task. Find the image, here: https://hub.docker.com/r/annixa/docker-pg_dump/

Usage

Attach a target postgres container to this container and mount a volume to container's /dump folder. Backups will appear in this volume. Optionally set up cron job schedule (default is 0 1 * * * - runs every day at 1:00 am).

Environment Variables:

Variable	Required?	Default	Description
PGUSER	Required	postgres	The user for accessing the database
PGPASSWORD	Optional	None	The password for accessing the database
PGDB	Optional	postgres	The name of the database
PGHOST	Optional	db	The hostname of the database
PGPORT	Optional	5432	The port for the database
CRON_SCHEDULE	Required	0 1 * * *	The cron schedule at which to run the pg_dump
DELETE_OLDER_THAN	Optional	None	Optionally, delete files older than DELETE_OLDER_THAN minutes. Do not include + or -.

Example:

postgres-backup:
  image: annixa/docker-pg_dump
  container_name: postgres-backup
  links:
    - postgres:db #Maps postgres as "db"
  environment:
    - PGUSER=postgres
    - PGPASSWORD=SumPassw0rdHere
    - CRON_SCHEDULE=* * * * * #Every minute
    - DELETE_OLDER_THAN=1 #Optionally delete files older than $DELETE_OLDER_THAN minutes.
  #  - PGDB=postgres # The name of the database to dump
  #  - PGHOST=db # The hostname of the PostgreSQL database to dump
  volumes:
    - /dump
  command: dump-cron

Run backup once without cron job, use "mybackup" as backup file prefix, shell will ask for password:

docker run -ti --rm \
    -v /path/to/target/folder:/dump \   # where to put db dumps
    -e PREFIX=mybackup \
    --link my-postgres-container:db \   # linked container with running mongo
    annixa/docker-pg_dump dump