Docker: Migrate from PostgreSQL 14 to 15

This guide describes how to migrate from PostgreSQL 14 to 15, since migrating through docker is a bit of a chore. This guide also assumes that you are using docker and the provided docker-compose.yml files defaults for postgres. If you don't use Docker Compose figure it out yourself

Is this needed?

This is optional, though it is highly recomended to run the latest version. If you do not want to go through the hassle of upgrading from 14 to 15, be assured that PostgreSQL 14 is still supported until November 12th, 2026. For more information see the PostgreSQL release policy

Backup

Make sure to make a backup, using the pg_dumpall command!

docker compose exec postgres pg_dumpall -U postgres > backup

Delete Existing Volumes

docker compose down

Find the Volume's Name

The volume's name will be like this: (the directory zipline is in)_pg_data, for example if the directory Zipline is in is called zipline, the volume name will be zipline_pg_data. Run the following command, to verify that the volume name is correct:

docker volume ls

Delete the Volume

docker volume rm (volume name)

Change the Version to 15

In the docker-compose.yml file, find the postgres section, and under the image property, you might see either postgres or postgres:14. Replace this with postgres:15.

version: '3'
services:
  postgres:
    image: postgres:15
    restart: always

Pull the New Image

Once you have changed the version, you need to pull the new image. This step is optional as Docker Compose will pull the image automatically when you start the container, but it is recommended to do this step to make sure you have the latest version if you have pulled the image before.

docker compose pull

Start the Postgres container

docker compose up -d postgres

Restore Backup

Before doing anything, make sure to restore the backup! This will restore all the data from the previous version, from your stored backup dump file.

docker compose exec -T postgres psql -U postgres < backup

Start Zipline

Now you can start the Zipline container, and it will run the migrations for you.

docker compose up -d zipline