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96 lines
3.1 KiB
ReStructuredText
96 lines
3.1 KiB
ReStructuredText
PostgreSQL Backups with Docker
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==============================
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.. note:: 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.
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Prerequisites
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-------------
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#. the project was generated with ``use_docker`` set to ``y``;
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#. the stack is up and running: ``docker-compose -f local.yml up -d postgres``.
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Creating a Backup
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-----------------
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To create a backup, run::
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$ docker-compose -f local.yml exec postgres backup
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Assuming your project's database is named ``my_project`` here is what you will see: ::
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Backing up the 'my_project' database...
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SUCCESS: 'my_project' database backup 'backup_2018_03_13T09_05_07.sql.gz' has been created and placed in '/backups'.
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Keep in mind that ``/backups`` is the ``postgres`` container directory.
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Viewing the Existing Backups
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----------------------------
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To list existing backups, ::
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$ docker-compose -f local.yml exec postgres backups
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These are the sample contents of ``/backups``: ::
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These are the backups you have got:
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total 24K
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-rw-r--r-- 1 root root 5.2K Mar 13 09:05 backup_2018_03_13T09_05_07.sql.gz
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-rw-r--r-- 1 root root 5.2K Mar 12 21:13 backup_2018_03_12T21_13_03.sql.gz
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-rw-r--r-- 1 root root 5.2K Mar 12 21:12 backup_2018_03_12T21_12_58.sql.gz
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Copying Backups Locally
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-----------------------
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If you want to copy backups from your ``postgres`` container locally, ``docker cp`` command_ will help you on that.
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For example, given ``9c5c3f055843`` is the container ID copying all the backups over to a local directory is as simple as ::
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$ docker cp 9c5c3f055843:/backups ./backups
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With a single backup file copied to ``.`` that would be ::
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$ docker cp 9c5c3f055843:/backups/backup_2018_03_13T09_05_07.sql.gz .
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.. _`command`: https://docs.docker.com/engine/reference/commandline/cp/
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Restoring from the Existing Backup
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----------------------------------
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To restore from one of the backups you have already got (take the ``backup_2018_03_13T09_05_07.sql.gz`` for example), ::
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$ docker-compose -f local.yml exec postgres restore backup_2018_03_13T09_05_07.sql.gz
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You will see something like ::
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Restoring the 'my_project' database from the '/backups/backup_2018_03_13T09_05_07.sql.gz' backup...
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INFO: Dropping the database...
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INFO: Creating a new database...
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INFO: Applying the backup to the new database...
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SET
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SET
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SET
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SET
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SET
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set_config
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------------
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(1 row)
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SET
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# ...
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ALTER TABLE
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SUCCESS: The 'my_project' database has been restored from the '/backups/backup_2018_03_13T09_05_07.sql.gz' backup.
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Backup to Amazon S3
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----------------------------------
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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. ::
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$ docker-compose -f production.yml run --rm awscli upload
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$ docker-compose -f production.yml run --rm awscli download backup_2018_03_13T09_05_07.sql.gz
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