Re: No downtime rolling upgrades with migration

Hello,

Please read my reply below.

Best of luck.

Regards

On Sun, 26 Mar 2023, 21:17 Sandip Bhattacharya, <sandipb@showmethesource.org> wrote:

New to django, so wanted to ask some questions that I didn't find good resources for:

1. If you deploy django apps using docker, do you run migrations before launching gunicorn/uwsgi etc within the docker image?

Daman:This is all upto you. Better to do when creating container. As you can also upgrade from git. 

2. If you do, how does rolling migrations work? Won't the non-upgraded replicas start erroring if the new schema is not backward compatible?

Daman:Create blue green deployment.

3. How do you do non-backward compatible schema upgrades? Do you do it out of band from deployments? Do you shift traffic to a different cluster, and then zero traffic upgrade the whole cluster at once?

Daman: Blue Green deployment can help. You can distribute traffic to old and new. When all stable then move everything. You can use kubernetes with helm.

Thanks,
  Sandip

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