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docs: Deprecate support for Xenial and Stretch. 

Also make sure our documentation for upgrading is reasonable for
Stretch => Buster.

Our reasoning for deprecating support for these releases is as follows:

* Ubuntu 16.04 Xenial reached desktop EOL last year; and will reach
  EOL on the server in about a year.

* Debian Stretch will each EOL in 2020 (the precise date is unclear in
  Debian's documentation, but based on past precedent it's in the next
  few months, perhaps July 2020).
  https://wiki.debian.org/DebianReleases#Production_Releases

* Both Ubuntu 16.04 and Debian Stretch use Python 3.5 as the system
  Python, which will reach EOL in September 2020 (and we're already
  seeing various third-party dependencies that we use drop support for
  them).

* While there is LTS support for these older releases, it's not clear it's
  going to be worth the added engineering effort for us to maintain EOL
  releases of the base OSes that we support.

* We (now) have clear upgrade instructions for moving to Debian Buster
  and Ubuntu 18.04.
This commit is contained in:
Tim Abbott 2020-04-16 14:38:44 -07:00
parent daacd2b5bf
commit 1219a2e854
2 changed files with 66 additions and 27 deletions
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17
docs/production/requirements.md
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@ -4,9 +4,9 @@ To run a Zulip server, you will need:
* A dedicated machine or VM * A dedicated machine or VM
* A supported OS: * A supported OS:
* Ubuntu 18.04 Bionic * Ubuntu 18.04 Bionic
* Ubuntu 16.04 Xenial * Ubuntu 16.04 Xenial (deprecated)
* Debian 9 Stretch
* Debian 10 Buster * Debian 10 Buster
* Debian 9 Stretch (deprecated)
* At least 2GB RAM, and 10GB disk space * At least 2GB RAM, and 10GB disk space
* If you expect 100+ users: 4GB RAM, and 2 CPUs * If you expect 100+ users: 4GB RAM, and 2 CPUs
* A hostname in DNS * A hostname in DNS
@ -29,12 +29,13 @@ can't support you, but
#### Operating System #### Operating System
Ubuntu 18.04 Bionic, Ubuntu 16.04 Xenial, Debian Buster and Debian Ubuntu 18.04 Bionic, Debian 10 Buster, Ubuntu 16.04 Xenial (deprecated),
Stretch are supported for running Zulip in production. 64-bit is and Debian 9 Stretch (deprecated) are supported for running Zulip in
recommended. We also recommend installing on the newest option you're production. 64-bit is recommended. We also recommend installing on
comfortable with, to save your organization the work of upgrading the newest option you're comfortable with, to save your organization
(Ubuntu Trusty [reached end of life in April 2019][trusty-eol]; Zulip the work of upgrading (Ubuntu Trusty [reached end of life in April
2.0 was the last major release to support it). 2019][trusty-eol]; Zulip 2.0 was the last major release to support
it).
If you're using Ubuntu, the If you're using Ubuntu, the
[Ubuntu universe repository][ubuntu-repositories] must be [Ubuntu universe repository][ubuntu-repositories] must be

76
docs/production/upgrade-or-modify.md
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@ -186,7 +186,7 @@ custom configuration.
## Upgrading the operating system ## Upgrading the operating system
When you upgrade the operating system on which Zulip is installed When you upgrade the operating system on which Zulip is installed
(E.g. Ubuntu 16.06 Xenial to Ubuntu 18.04 Bionic), you need to take (E.g. Ubuntu 16.04 Xenial to Ubuntu 18.04 Bionic), you need to take
some additional steps to update your Zulip installation, documented some additional steps to update your Zulip installation, documented
below. below.
@ -196,18 +196,21 @@ instructions for other supported platforms.
### Upgrading from Ubuntu 16.04 Xenial to 18.04 Bionic ### Upgrading from Ubuntu 16.04 Xenial to 18.04 Bionic
1. First, as the Zulip user, stop the Zulip server and run the following 1. Upgrade your server to the latest Zulip `2.1.x` release, since
to back up the system: newer releases don't support Ubuntu 16.04 Xenial.
2. As the Zulip user, stop the Zulip server and run the following
to back up the system:
``` ```
supervisorctl stop all supervisorctl stop all
/home/zulip/deployments/current/manage.py backup --output=/home/zulip/release-upgrade.backup.tar.gz /home/zulip/deployments/current/manage.py backup --output=/home/zulip/release-upgrade.backup.tar.gz
``` ```
2. Switch to the root user and upgrade the operating system using the 3. Switch to the root user and upgrade the operating system using the
OS's standard tooling. E.g. for Ubuntu, this means running OS's standard tooling. E.g. for Ubuntu, this means running
`do-release-upgrade` and following the prompts until it completes `do-release-upgrade` and following the prompts until it completes
successfully: successfully:
``` ```
sudo -i # Or otherwise get a root shell sudo -i # Or otherwise get a root shell
@ -220,8 +223,8 @@ successfully:
currently installed version. But it's not important; the next currently installed version. But it's not important; the next
step will re-install Zulip's configuration in any case. step will re-install Zulip's configuration in any case.
3. As root, upgrade the database installation and OS configuration to 4. As root, upgrade the database installation and OS configuration to
match the new OS version: match the new OS version:
``` ```
touch /usr/share/postgresql/10/pgroonga_setup.sql.applied touch /usr/share/postgresql/10/pgroonga_setup.sql.applied
@ -235,10 +238,11 @@ match the new OS version:
systemctl restart memcached systemctl restart memcached
``` ```
4. At this point, you are now running the version of postgres that 5. At this point, you are now running the version of postgres that
comes with the new Ubuntu version. Finally, we need to reinstall the comes with the new Ubuntu version. Finally, we need to reinstall
current version of Zulip, which among other things will recompile the current version of Zulip, which among other things will
Zulip's Python module dependencies for your new version of Python: recompile Zulip's Python module dependencies for your new version
of Python:
``` ```
rm -rf /srv/zulip-venv-cache/* rm -rf /srv/zulip-venv-cache/*
@ -253,14 +257,14 @@ working correctly.
### Upgrading from Ubuntu 14.04 Trusty to 16.04 Xenial ### Upgrading from Ubuntu 14.04 Trusty to 16.04 Xenial
First, make sure you upgrade your server to the latest Zulip `2.0.x`, 1. Upgrade your server to the latest Zulip `2.0.x` release, since newer
since newer releases don't support Ubuntu 14.04 Trusty. releases don't support Ubuntu 14.04 Trusty.
1. Same as for Xenial to Bionic.
2. Same as for Xenial to Bionic. 2. Same as for Xenial to Bionic.
3. As root, upgrade the database installation and OS configuration to 3. Same as for Xenial to Bionic.
4. As root, upgrade the database installation and OS configuration to
match the new OS version: match the new OS version:
``` ```
@ -275,7 +279,41 @@ match the new OS version:
service memcached restart service memcached restart
``` ```
4. Same as for Xenial to Bionic. 5. Same as for Xenial to Bionic.
### Upgrading from Debian Stretch to Debian Buster
1. Upgrade your server to the latest Zulip `2.1.x` release, since newer
releases don't support Debian Stretch.
2. Same as for Xenial to Bionic, above.
3. Follow [Debian's instructions to upgrade the OS][debian-upgrade-os].
[debian-upgrade-os]: https://www.debian.org/releases/buster/amd64/release-notes/ch-upgrading.html
When prompted for you how to upgrade configuration
files for services that Zulip manages like `redis`, `postgres`,
`nginx`, and `memcached`, the best choice is `N` to keep the
currently installed version. But it's not important; the next
step will re-install Zulip's configuration in any case.
4. As root, upgrade the database installation and OS configuration to
match the new OS version:
```
apt remove upstart -y
/home/zulip/deployments/current/scripts/zulip-puppet-apply -f
pg_dropcluster 9.5 main --stop
systemctl stop postgresql
pg_upgradecluster -m upgrade 9.3 main
pg_dropcluster 9.3 main
apt remove postgresql-9.3
systemctl start postgresql
service memcached restart
```
5. Same as for Xenial to Bionic.
## Modifying Zulip ## Modifying Zulip