[Pulp-list] pulp3 migration directory

[Bin Li (BLOOMBERG/ 120 PARK)]

Thanks Mike. What you described is what we plan to do. I do see the migration historical files. They are under ../venv/pulp/3.7 in our case. It is a virtual environment used by the pulp_installer.  We set the pulp_install_dir to this directory.  Since we are upgrading python to 3.8 for pulp 3.15.  We set the pulp_install_dir to  a new ../venv/pulp/3.8. Because this is a new python install dir, I am not sure how pulp_installer know where to find the historical file under the old ../venv/pulp/3.7. Could this be an issue for the migration?

From: mikedep333 at redhat.com At: 09/20/21 12:21:22 UTC-4:00To:  Bin Li (BLOOMBERG/ 120 PARK ) 
Cc:  pulp-list at redhat.com
Subject: Re: [Pulp-list] pulp3 migration directory

Hi Bin,

We are trying to understand what you are asking exactly.

It sounds like:
1. you have a test environment with a copy of the production database.
2. You upgraded pulp on the test environment. During this, the migrations were ran by pulp_installer against the test database copy.
3. You will run the upgrade pulp on the production environment, which will upgrade the production database.

So we have all the possibly needed migration files on disk. They are static, and are part of the pypi packages (and RPM packages too.) This is a change from the pulpcore 3.0 alpha/beta/rc behavior, when we generated the migrations.

If you run `find /usr/local/lib/pulp | grep migrations` , you will see all of them. You'll see both compiled .pyc files and the original .py files.

When the installer runs, it runs all the needed migrations. This is part of the pulp_database_config role, the task is named "Run database migrations".

roles/pulp_database_config/README.md still refers to the pulpcore 3.0 alpha/beta/rc behavior when it says that it "Create and run migrations." It only runs them now. I will fix this doc.

Does this answer your questions?

-Mike
On Thu, Sep 16, 2021 at 4:52 PM Bin Li (BLOOMBERG/ 120 PARK) <bli111 at bloomberg.net> wrote:

The 3.15 release requires python 3.8. We are currently running pulpcore 3.7 with python 3.7 and an external db. When we use the pulp_installer to migrate the older release to 3.15 with new python 3.8 venv,it run successfully in a test environment. I am wondering how the new version knows the the historical migration file. Should I copy the historical migration files from older python 3.7 venv to the new 3.8 venv first?_______________________________________________
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Mike DePaulo
He / Him / His
Service Reliability Engineer, Pulp
Red Hat
IM: mikedep333
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