Docker Factory Reset

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Sometimes you need to quickly dump and restore a PostgreSQL database, but what's the easiest way to do this when your database is in a Docker container?

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2021-04-07: Updated the guide with a more up-to-date method for sending a password along with the commands.

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I ran into this just today, and thought I'd share one method that I felt was easy, fast and served my purpose. Depending on why you need to dump/restore a database, this might help for you, too.

This quickie assumes you have nothing directly installed on your development machine, so everything is run straight from and to the Docker PostgreSQL container you're running.

Dump using pg_dump

Restore using psql

Since you are not able to provide a password directly through arguments, we rely on the PGPASSWORD environment variable:

Docker Factory Reset Windows

Docker Factory ResetReset

Note: If you are attempting to restore data from a custom format dump, you should instead use pg_restore as I described in my How to set up and use Postgres locally article.

Note: By default PostgreSQL keeps importing even when errors occur. If you would instead prefer to stop the import completely upon error, be sure to add --set ON_ERROR_STOP=on to your above command.

Dump and restore in one command

If you, for example, are moving data from one (e.g. manually created) container to another, you could use pipes to do this in one command, like so:

Conclusions

There are certainly other ways to achieve something similar, but this method will work in a pinch. Please keep in mind that you should always ensure your production databases are properly backed up, and ideally automatically so. If you use any of these manual steps as a means to create backups, you're probably doing something not entirely correct. These steps are mostly for moving development data around or pulling (partial) production data locally for debugging, or something along those lines.

That's it, really. I hope this note-to-self quickie will be of some help to you as-well.

Thank you.

With a total of over 300000 downloads, NavContainerHelper is no more. As of this weekend, NavContainerHelper cannot be used to create containers anymore. There has been a lot of blog posts here on my blog and others that indicated that this day would come and now it is here… – all specific images are gone and with those all the “old” generic images, which was used by NavContainerHelper.

Docker Factory Reset Download

I will contact PowerShell Gallery to get the entry removed.

RIP NavContainerHelper, Long Live BcContainerHelper.

The recipe for changing from NavContainerHelper to BcContainerHelper goes here:

Docker Reset Factory Settings

  1. Remove all containers (Get-NavContainers | Remove-NavContainer)
  2. Uninstall all versions of NavContainerHelper (UnInstall-Module NavContainerHelper -allversions)
  3. Restart PowerShell and check that NavContainerHelper is gone (else repeat step 2)
  4. Reset Docker to factory settings (to remove all images)
  5. Remove c:ProgramDataNavContainerHelper
  6. Install BcContainerHelper (Install-Module BcContainerHelper -force)

Factory Reset Windows 10

Hope this helps

Docker Factory Reset Windows 7

Freddy Kristiansen
Technical Evangelist