Move to Mailman 3 (and hyperkitty web archive)

[butlerpd]

We are currently running Mailman 2.1.16. GNU Mailman 3.0 was released in April 2015 and completely refactors the architecture to modern standards. It also requires python 3. Mailman 3 is in active development (current stable release is 3.3.4 released in March 2021) while version 2 is in maintenance mode (last stable version is 2.1.34 released in June 2020). Version 3 offers many new things that will be helpful to the SasView community including archives that can act like bulletin boards, or Stack-Overflow or Quora which folks expect today.

This however will be a major upgrade and is NOT compatible with 2.1 and cannot be installed on the same server. Since we also need to migrate all services to danse2 running Ubuntu 20.04 LTS so that we can upgrade danse1's hardware (needs new drives and maybe memory) and its OS from 14.04 LTS, this is the perfect opportunity.

Suggested plan

• Install mailman 3 components (all 5) on danse2. Make sure to set up for virtual environments to support multiple domain lists (e.g. canSAS, SasView, smallangle.org etc) See Mailman instructions here:
  • https://docs.mailman3.org/en/latest/
  • https://docs.mailman3.org/projects/mailman/en/latest/README.html
• Set mailman to use mysql as the database (already installed)
• Set up for canSAS temporarily as a test without disturbing SasView mailing lists
• Once all set up, tested and running, follow migration steps (including porting the old archives over) documented here:
  • https://docs.debops.org/en/master/ansible/roles/mailman/mailman2-migration.html
  • https://docs.mailman3.org/en/latest/upgrade-3.2.html
  • https://docs.mailman3.org/en/latest/migration.html
• Once all is running fix the Apache virtual server entry if not already done
• Point the DNS entry for SasView mailing lists to danse2
• DOCUMENT EVERYTHING DONE ON THE WIKI