PostgreSQL Backups with Docker
For brevity it is assumed that you will be running the below commands against local environment, however, this is by no means mandatory so feel free to switch to
production.yml when needed.
the project was generated with
the stack is up and running:
docker-compose -f local.yml up -d postgres.
Creating a Backup
To create a backup, run:
$ docker-compose -f local.yml exec postgres backup
Assuming your project’s database is named
my_project here is what you will see:
Backing up the 'my_project' database... SUCCESS: 'my_project' database backup 'backup_2018_03_13T09_05_07.sql.gz' has been created and placed in '/backups'.
Keep in mind that
/backups is the
postgres container directory.
Viewing the Existing Backups
To list existing backups,
$ docker-compose -f local.yml exec postgres backups
These are the sample contents of
These are the backups you have got: total 24K -rw-r--r-- 1 root root 5.2K Mar 13 09:05 backup_2018_03_13T09_05_07.sql.gz -rw-r--r-- 1 root root 5.2K Mar 12 21:13 backup_2018_03_12T21_13_03.sql.gz -rw-r--r-- 1 root root 5.2K Mar 12 21:12 backup_2018_03_12T21_12_58.sql.gz
Copying Backups Locally
If you want to copy backups from your
postgres container locally,
docker cp command will help you on that.
For example, given
9c5c3f055843 is the container ID copying all the backups over to a local directory is as simple as
$ docker cp 9c5c3f055843:/backups ./backups
With a single backup file copied to
. that would be
$ docker cp 9c5c3f055843:/backups/backup_2018_03_13T09_05_07.sql.gz .
You can also get the container ID using
docker-compose -f local.yml ps -q postgres so if you want to automate your backups, you don’t have to check the container ID manually every time. Here is the full command
$ docker cp $(docker-compose -f local.yml ps -q postgres):/backups ./backups
Restoring from the Existing Backup
To restore from one of the backups you have already got (take the
backup_2018_03_13T09_05_07.sql.gz for example),
$ docker-compose -f local.yml exec postgres restore backup_2018_03_13T09_05_07.sql.gz
You will see something like
Restoring the 'my_project' database from the '/backups/backup_2018_03_13T09_05_07.sql.gz' backup... INFO: Dropping the database... INFO: Creating a new database... INFO: Applying the backup to the new database... SET SET SET SET SET set_config ------------ (1 row) SET # ... ALTER TABLE SUCCESS: The 'my_project' database has been restored from the '/backups/backup_2018_03_13T09_05_07.sql.gz' backup.
Backup to Amazon S3
For uploading your backups to Amazon S3 you can use the aws cli container. There is an upload command for uploading the postgres /backups directory recursively and there is a download command for downloading a specific backup. The default S3 environment variables are used.
$ docker-compose -f production.yml run --rm awscli upload $ docker-compose -f production.yml run --rm awscli download backup_2018_03_13T09_05_07.sql.gz