How do I use openupgradelib to update from odoo15 to odoo16?

When I try to update odoo from v15 to v16 (running in a docker environment) via openupgradelib I encouter two problems:

1. some modules like account isn't migrated into the new database
2. and in general the new database is as described as possibly not compatible with the new version 16

I have provided all necessary modules and run the update with the following command (parameters): -c ou_15_16.config --save --database odoo16 --upgrade-path=/mnt/extra-addons/openupgrade_scripts/scripts --load=base,web,account,openupgrade_framework --update all --stop-after-init

I'm using postgres 15.4 to store the database. Am I missing something? I get no errors while the upgrade is running only a list of successfull migrated modules. And no message that some modules like account aren't migrated and I don't see them in the new database.

First of all:

Odoo images are not updated as frequently as the GitHub code, so they are more likely to give more errors when migrating. It is recommended to migrate in a directly installed environment, not in images. However, the process to migrate with docker is:

Migration process:

• In odoo15: Take a backup of the database to migrate.
• In odoo 16: Clone the openupgrade repository (https://github.com/OCA/OpenUpgrade) in the custom addons folder.

• In odoo 16: Create an image that contains the openupgradelib library(Modify Dockerfile).Ex:

  FROM odoo:16.0

  USER root

  COPY ./requirements.txt /requirements.txt

  RUN pip3 install -r /requirements.txt

  RUN rm /requirements.txt

  RUN apt-get update && apt-get install -y git

  RUN pip3 install git+https://github.com/OCA/openupgradelib.git@master#egg=openupgradelib

• Start odoo 16 server (Use: ENTRYPOINT=/usr/bin/python3 -m debugpy --listen 0.0.0.0:5678 /usr/bin/odoo -c /etc/odoo/odoo.conf ).

• In odoo16: Restore the database from backup file of version 15. The database will be restored and will appear in the list of databases with errors. Don't worry about it.

• In odoo 16: Modify the environment variable ENTRYPOINT=/usr/bin/python3 -m debugpy --listen 0.0.0.0:5678 /usr/bin/odoo -c /etc/odoo/odoo.conf -d <data_base_name> --upgrade-path=/var/lib/odoo/custom_addons/OpenUpgrade/openupgrade_scripts/scripts --update all --stop-after-init --load=base,web,openupgrade_framework
• note: The path /var/lib/odoo/custom_addons/OpenUpgrade/openupgrade_scripts/scripts depends on how the volumes were configured in the docker-compose.yml file.

• In odoo16: Add the location of the cloned Openupgrade repository to the configuration file. Ex: /var/lib/odoo/custom_addons/OpenUpgrade, /var/lib/odoo/custom_addons/OpenUpgrade/openupgrade_scripts, /var/lib/odoo/custom_addons/OpenUpgrade/openupgrade_framework
• On odoo 16: start the server (docker up) and wait. The migration start.
• On odoo 16: Start the server with ENTRYPOINT=/usr/bin/python3 -m debugpy --listen 0.0.0.0:5678 /usr/bin/odoo -c /etc/odoo/odoo.conf. If everything went well, the database will appear without errors and can be used.

Final steps:

• In odoo 16: install the database_cleanup module (https://apps.odoo.com/apps/modules/16.0/database_cleanup) or clone from the OCA repository (https://github.com/OCA/server-tools)
• In odoo16: go to Settings/Technical and choose the database cleanup options, run them all.