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zulip/docs/production/upgrade.md

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# Upgrade Zulip
This page explains how to upgrade a Zulip server, including:
- [Upgrading to a release](#upgrading-to-a-release)
- [Upgrading from a Git repository](#upgrading-from-a-git-repository)
- [Updating `settings.py` inline documentation](#updating-settingspy-inline-documentation)
- [Troubleshooting and rollback](#troubleshooting-and-rollback)
- [Preserving local changes to service configuration files](#preserving-local-changes-to-service-configuration-files)
- [Upgrading the operating system](#upgrading-the-operating-system)
- [Upgrading PostgreSQL](#upgrading-postgresql)
## Upgrading to a release
Note that there are additional instructions if you're [using
docker-zulip][docker-upgrade], have [patched Zulip](modify.md),
or have [modified Zulip-managed configuration
files](#preserving-local-changes-to-service-configuration-files). To upgrade
to a new Zulip release:
1. Read the [upgrade notes](../overview/changelog.md#upgrade-notes)
for all releases newer than what is currently installed.
1. Download the appropriate release tarball from
<https://download.zulip.com/server/>. You can get the latest
release (**Zulip Server {{ LATEST_RELEASE_VERSION }}**) with the
following command:
```bash
curl -fLO https://download.zulip.com/server/zulip-server-latest.tar.gz
```
You also have the option of upgrading Zulip [to a version in a Git
repository directly](#upgrading-from-a-git-repository) or creating
your own release tarballs from a copy of the [zulip.git
repository](https://github.com/zulip/zulip) using
`tools/build-release-tarball`.
1. Log in to your Zulip and run as root:
```bash
/home/zulip/deployments/current/scripts/upgrade-zulip zulip-server-latest.tar.gz
```
The upgrade process will:
- Run `apt-get upgrade`
- Install new versions of Zulip's dependencies (mainly Python packages).
- (`upgrade-zulip-from-git` only) Build Zulip's frontend assets using `webpack`.
- Shut down the Zulip service
- Run a `puppet apply`
- Run any database migrations
- Bring the Zulip service back up on the new version.
Upgrading will result in brief downtime for the service, which should
be under 30 seconds unless there is an expensive database migration
involved (these will be documented in the [release
notes](../overview/changelog.md), and usually can be avoided with
some care). If downtime is problematic for your organization,
consider testing the upgrade on a
[backup](export-and-import.md#backups) in advance,
doing the final upgrade at off hours, or buying a support contract.
See the [troubleshooting guide](#troubleshooting-and-rollback) if you
run into any issues or need to roll back the upgrade.
## Upgrading from a Git repository
Zulip supports upgrading a production installation to any commit in a
Git repository, which is great for [running pre-release changes from
`main`](modify.md#applying-changes-from-main) or [maintaining a
fork](modify.md#making-changes). The process is simple:
```bash
# Upgrade to an official release
/home/zulip/deployments/current/scripts/upgrade-zulip-from-git 1.8.1
# Upgrade to a branch (or other Git ref)
/home/zulip/deployments/current/scripts/upgrade-zulip-from-git 2.1.x
/home/zulip/deployments/current/scripts/upgrade-zulip-from-git main
```
Zulip will automatically fetch the relevant Git commit and upgrade to
that version of Zulip.
Branches with names like `2.1.x` are stable release branches,
containing the changes planned for the next minor release
(E.g. 2.1.5); we support these stable release branches as though they
were a published release.
The `main` branch contains changes planned for the next major
release (E.g. 3.0); see our documentation on [running
`main`](modify.md#upgrading-to-main) before upgrading to it.
By default, this uses the main upstream Zulip server repository, but
you can configure any other Git repository by adding a section like
this to `/etc/zulip/zulip.conf`:
```ini
[deployment]
git_repo_url = https://github.com/zulip/zulip.git
```
See also our documentation on [upgrading
docker-zulip](https://github.com/zulip/docker-zulip#upgrading-from-a-git-repository).
## Updating `settings.py` inline documentation
Zulip installations often upgrade many times over their lifetime, and
we strive to keep all configuration files backwards-compatible.
However, our practice of leaving the `/etc/zulip/settings.py`
unchanged during upgrades means that there may be new features which
are not documented in that file, since it was based on a template
provided by an earlier version of Zulip, during the initial install.
After upgrading across major versions of Zulip Server, we recommend
comparing your `/etc/zulip/settings.py` file to the current settings
template, which can be found in
`/home/zulip/deployments/current/zproject/prod_settings_template.py`. We
suggest using that updated template to update
`/etc/zulip/settings.py`:
1. Copy the current `settings.py` to make a backup (especially if you
do not have a recent [complete backup][backups]), and make a copy
of the current template:
```bash
cp -a /etc/zulip/settings.py ~/zulip-settings-backup.py
cp -a /home/zulip/deployments/current/zproject/prod_settings_template.py /etc/zulip/settings-new.py
```
1. Open both `/etc/zulip/settings.py` and `/etc/zulip/settings-new.py`
files in an editor; for each setting set in `settings.py`, find its
section in `/etc/zulip/settings-new.py` and copy the setting from
`settings.py` into there.
The following tool may help, by finding the most likely version of
the template that your `/etc/zulip/settings.py` was installed
using, and the differences that your file has from that:
```bash
/home/zulip/deployments/current/scripts/setup/compare-settings-to-template
```
If there are settings which you cannot find documented in
`/etc/zulip/settings-new.py`, check the [changelog][changelog] to see
if they have been removed.
1. Overwrite the configuration with the updated file, and restart the
server to pick up the updates; this should be a no-op, but it is
much better to discover immediately if it is not:
```bash
cp -a /etc/zulip/settings-new.py /etc/zulip/settings.py
su zulip -c '/home/zulip/deployments/current/scripts/restart-server'
```
[backups]: export-and-import.md#backups
[changelog]: ../overview/changelog.md
## Troubleshooting and rollback
See also the general Zulip server [troubleshooting
guide](troubleshooting.md).
The upgrade scripts are idempotent, so there's no harm in trying again
after resolving an issue. The most common causes of errors are:
- Networking issues (e.g. your Zulip server doesn't have reliable
Internet access or needs a proxy set up). Fix the networking issue
and try again.
- Especially when using `upgrade-zulip-from-git`, systems with the
minimal RAM for running Zulip can run into out-of-memory issues
during the upgrade process (generally `tools/webpack` is the step
that fails). You can get past this by shutting down the Zulip
server with `./scripts/stop-server` to free up RAM before running
the upgrade process.
Useful logs are available in a few places:
- The Zulip upgrade scripts log all output to
`/var/log/zulip/upgrade.log`.
- The Zulip server logs all Internal Server Errors to
`/var/log/zulip/errors.log`.
If you need help and don't have a support contract, you can visit
[#production
help](https://chat.zulip.org/#narrow/stream/31-production-help) in the
[Zulip development community
server](https://zulip.com/development-community/) for best-effort help.
Please include the relevant error output from the above logs in a
[Markdown code
block](https://zulip.com/help/code-blocks)
in any reports.
### Rolling back to a prior version
This rollback process is intended for minor releases (e.g. `2.0.3` to
`2.0.6`); a more complicated process is required to roll back database
migrations before downgrading to an older major release.
The Zulip upgrade process works by creating a new deployment under
`/home/zulip/deployments/` containing a complete copy of the Zulip server code,
and then moving the symlinks at `/home/zulip/deployments/{current,last,next}`
as part of the upgrade process.
This means that if the new version isn't working,
you can quickly downgrade to the old version by running
`/home/zulip/deployments/last/scripts/restart-server`, or to an
earlier previous version by running
`/home/zulip/deployments/DATE/scripts/restart-server`. The
`restart-server` script stops any running Zulip server, and starts
the version corresponding to the `restart-server` path you call.
## Deployment hooks
Zulip's upgrades have a hook system which allows for arbitrary
user-configured actions to run before and after an upgrade.
Files in the `/etc/zulip/pre-deploy.d` and `/etc/zulip/post-deploy.d`
directories are inspected for files ending with `.hook`, just before
and after the critical period when the server is restarted. Each file
is called, sorted in alphabetical order, from the working directory of
the new version, with arguments of the old and new Zulip versions. If
they exit with non-0 exit code, the upgrade will abort.
See the [deploy documentation](deployment.md#deployment-hooks) for
hooks included with Zulip.
## Preserving local changes to service configuration files
:::{warning}
If you have modified service configuration files installed by
Zulip (e.g. the nginx configuration), the Zulip upgrade process will
overwrite your configuration when it does the `puppet apply`.
:::
You can test whether this will happen assuming no upstream changes to
the configuration using `scripts/zulip-puppet-apply` (without the
`-f` option), which will do a test Puppet run and output and changes
it would make. Using this list, you can save a copy of any files
that you've modified, do the upgrade, and then restore your
configuration.
That said, Zulip's configuration files are designed to be flexible
enough for a wide range of installations, from a small self-hosted
system to Zulip Cloud. Before making local changes to a configuration
file, first check whether there's an option supported by
`/etc/zulip/zulip.conf` for the customization you need. And if you
need to make local modifications, please report the issue so that we
can make the Zulip Puppet configuration flexible enough to handle your
setup.
### nginx configuration changes
If you need to modify Zulip's `nginx` configuration, we recommend
first attempting to add configuration to `/etc/nginx/conf.d` or
`/etc/nginx/zulip-include/app.d`; those directories are designed for
custom configuration, and are not overridden during upgrades. The
former is useful for directives with the `http` [context][context],
and the latter for `server` contexts.
[context]: http://nginx.org/en/docs/beginners_guide.html#conf_structure
## Upgrading the operating system
When you upgrade the operating system on which Zulip is installed
(E.g. Ubuntu 20.04 Focal to Ubuntu 22.04 Jammy), you need to take
some additional steps to update your Zulip installation, documented
below.
The steps are largely the same for the various OS upgrades aside from
the versions of PostgreSQL, so you should be able to adapt these
instructions for other supported platforms.
### Upgrading from Ubuntu 20.04 Focal to 22.04 Jammy
1. Upgrade your server to the latest Zulip `5.x` release (at
least 5.3, which adds support for Ubuntu 22.04 and above).
2. As the Zulip user, stop the Zulip server and run the following
to back up the system:
```bash
supervisorctl stop all
/home/zulip/deployments/current/manage.py backup --output=/home/zulip/release-upgrade.backup.tar.gz
```
3. Switch to the root user and upgrade the operating system using the
OS's standard tooling. E.g. for Ubuntu, this means running
`do-release-upgrade` and following the prompts until it completes
successfully:
```bash
sudo -i # Or otherwise get a root shell
do-release-upgrade
```
When `do-release-upgrade` asks you how to upgrade configuration
files for services that Zulip manages like Redis, PostgreSQL,
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 to the latest version of PostgreSQL:
```bash
/home/zulip/deployments/current/scripts/setup/upgrade-postgresql
```
5. Next, we need to reinstall the current version of Zulip, which
among other things will recompile Zulip's Python module
dependencies for your new version of Python and rewrite Zulip's
full-text search indexes to work with the upgraded dictionary
packages:
```bash
rm -rf /srv/zulip-venv-cache/*
/home/zulip/deployments/current/scripts/lib/upgrade-zulip-stage-2 \
/home/zulip/deployments/current/ --ignore-static-assets --audit-fts-indexes
```
This will finish by restarting your Zulip server; you should now be
able to navigate to its URL and confirm everything is working
correctly.
### Upgrading from Ubuntu 18.04 Bionic to 20.04 Focal
1. Upgrade your server to the latest Zulip `3.x` or `4.x` release (at
least 3.0, which adds support for Ubuntu 20.04). You can only
upgrade to Zulip 5.0 and newer after completing this process, since
newer releases don't support Ubuntu 18.04.
2. As the Zulip user, stop the Zulip server and run the following
to back up the system:
```bash
supervisorctl stop all
/home/zulip/deployments/current/manage.py backup --output=/home/zulip/release-upgrade.backup.tar.gz
```
3. Switch to the root user and upgrade the operating system using the
OS's standard tooling. E.g. for Ubuntu, this means running
`do-release-upgrade` and following the prompts until it completes
successfully:
```bash
sudo -i # Or otherwise get a root shell
do-release-upgrade
```
When `do-release-upgrade` asks you how to upgrade configuration
files for services that Zulip manages like Redis, PostgreSQL,
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 to the latest version of PostgreSQL:
```bash
/home/zulip/deployments/current/scripts/setup/upgrade-postgresql
```
5. Next, we need to reinstall the current version of Zulip, which
among other things will recompile Zulip's Python module
dependencies for your new version of Python and rewrite Zulip's
full-text search indexes to work with the upgraded dictionary
packages:
```bash
rm -rf /srv/zulip-venv-cache/*
/home/zulip/deployments/current/scripts/lib/upgrade-zulip-stage-2 \
/home/zulip/deployments/current/ --ignore-static-assets --audit-fts-indexes
```
This will finish by restarting your Zulip server; you should now be
able to navigate to its URL and confirm everything is working
correctly.
6. Finally, Ubuntu 20.04 has a different version of the low-level
glibc library, which affects how PostgreSQL orders text data (known
as "collations"); this corrupts database indexes that rely on
collations. Regenerate the affected indexes by running:
```bash
/home/zulip/deployments/current/scripts/setup/reindex-textual-data --force
```
7. We recommend that you now [upgrade from Ubuntu 20.04 to
22.04](#upgrading-from-ubuntu-2004-focal-to-2204-jammy). Although
Ubuntu 20.04 is still supported at this time, Ubuntu 22.04 will be
supported farther into the future.
### Upgrading from Ubuntu 16.04 Xenial to 18.04 Bionic
1. Upgrade your server to the latest Zulip `2.1.x` release. You can
only upgrade to Zulip 3.0 and newer after completing this process,
since newer releases don't support Ubuntu 16.04 Xenial.
2. Same as for Ubuntu 18.04 to 20.04.
3. Same as for Ubuntu 18.04 to 20.04.
4. As root, upgrade the database installation and OS configuration to
match the new OS version:
```bash
touch /usr/share/postgresql/10/pgroonga_setup.sql.applied
/home/zulip/deployments/current/scripts/zulip-puppet-apply -f
pg_dropcluster 10 main --stop
systemctl stop postgresql
pg_upgradecluster 9.5 main
pg_dropcluster 9.5 main
apt remove postgresql-9.5
systemctl start postgresql
systemctl restart memcached
```
5. Finally, we need to reinstall the current version of Zulip, which
among other things will recompile Zulip's Python module
dependencies for your new version of Python:
```bash
rm -rf /srv/zulip-venv-cache/*
/home/zulip/deployments/current/scripts/lib/upgrade-zulip-stage-2 \
/home/zulip/deployments/current/ --ignore-static-assets
```
This will finish by restarting your Zulip server; you should now
be able to navigate to its URL and confirm everything is working
correctly.
6. [Upgrade to the latest `4.x` release](#upgrading-to-a-release).
7. As root, verify the contents of the full-text indexes:
```bash
/home/zulip/deployments/current/manage.py audit_fts_indexes
```
8. [Upgrade from Ubuntu 18.04 to
20.04](#upgrading-from-ubuntu-1804-bionic-to-2004-focal), so that
you are running a supported operating system.
### Upgrading from Ubuntu 14.04 Trusty to 16.04 Xenial
1. Upgrade your server to the latest Zulip `2.0.x` release. You can
only upgrade to Zulip `2.1.x` and newer after completing this
process, since newer releases don't support Ubuntu 14.04 Trusty.
2. Same as for Ubuntu 18.04 to 20.04.
3. Same as for Ubuntu 18.04 to 20.04.
4. As root, upgrade the database installation and OS configuration to
match the new OS version:
```bash
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. Finally, we need to reinstall the current version of Zulip, which
among other things will recompile Zulip's Python module
dependencies for your new version of Python:
```bash
rm -rf /srv/zulip-venv-cache/*
/home/zulip/deployments/current/scripts/lib/upgrade-zulip-stage-2 \
/home/zulip/deployments/current/ --ignore-static-assets
```
This will finish by restarting your Zulip server; you should now be
able to navigate to its URL and confirm everything is working
correctly.
6. [Upgrade from Ubuntu 16.04 to
18.04](#upgrading-from-ubuntu-1604-xenial-to-1804-bionic), so
that you are running a supported operating system.
### Upgrading from Debian 10 to 11
1. Upgrade your server to the latest `5.x` release. You can only
upgrade to Zulip Server 6.0 and newer after completing this
process, since newer releases don't support Debian 10.
2. As the Zulip user, stop the Zulip server and run the following
to back up the system:
```bash
/home/zulip/deployments/current/scripts/stop-server
/home/zulip/deployments/current/manage.py backup --output=/home/zulip/release-upgrade.backup.tar.gz
```
3. Follow [Debian's instructions to upgrade the OS][bullseye-upgrade].
[bullseye-upgrade]: https://www.debian.org/releases/bullseye/amd64/release-notes/ch-upgrading.html
When prompted for you how to upgrade configuration
files for services that Zulip manages like Redis, PostgreSQL,
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, run the following steps to regenerate configurations
for services used by Zulip:
```bash
apt remove upstart -y
/home/zulip/deployments/current/scripts/zulip-puppet-apply -f
```
5. Reinstall the current version of Zulip, which among other things
will recompile Zulip's Python module dependencies for your new
version of Python:
```bash
rm -rf /srv/zulip-venv-cache/*
/home/zulip/deployments/current/scripts/lib/upgrade-zulip-stage-2 \
/home/zulip/deployments/current/ --ignore-static-assets --audit-fts-indexes
```
This will finish by restarting your Zulip server; you should now
be able to navigate to its URL and confirm everything is working
correctly.
6. Debian 11 has a different version of the low-level glibc
library, which affects how PostgreSQL orders text data (known as
"collations"); this corrupts database indexes that rely on
collations. Regenerate the affected indexes by running:
```bash
/home/zulip/deployments/current/scripts/setup/reindex-textual-data --force
```
7. As an additional step, you can also [upgrade the PostgreSQL version](#upgrading-postgresql).
### Upgrading from Debian 9 to 10
1. Upgrade your server to the latest Zulip `2.1.x` release. You can
only upgrade to Zulip 3.0 and newer after completing this process,
since newer releases don't support Debian 9.
2. As the Zulip user, stop the Zulip server and run the following
to back up the system:
```bash
supervisorctl stop all
/home/zulip/deployments/current/manage.py backup --output=/home/zulip/release-upgrade.backup.tar.gz
```
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, PostgreSQL,
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:
```bash
apt remove upstart -y
/home/zulip/deployments/current/scripts/zulip-puppet-apply -f
pg_dropcluster 11 main --stop
systemctl stop postgresql
pg_upgradecluster -m upgrade 9.6 main
pg_dropcluster 9.6 main
apt remove postgresql-9.6
systemctl start postgresql
service memcached restart
```
5. Finally, we need to reinstall the current version of Zulip, which
among other things will recompile Zulip's Python module
dependencies for your new version of Python:
```bash
rm -rf /srv/zulip-venv-cache/*
/home/zulip/deployments/current/scripts/lib/upgrade-zulip-stage-2 \
/home/zulip/deployments/current/ --ignore-static-assets
```
This will finish by restarting your Zulip server; you should now
be able to navigate to its URL and confirm everything is working
correctly.
6. [Upgrade to the latest `5.x` release](#upgrading-to-a-release), now
that your server is running a supported operating system.
7. Debian 10 has a different version of the low-level glibc
library, which affects how PostgreSQL orders text data (known as
"collations"); this corrupts database indexes that rely on
collations. Regenerate the affected indexes by running:
```bash
/home/zulip/deployments/current/scripts/setup/reindex-textual-data --force
```
8. As root, finish by verifying the contents of the full-text indexes:
```bash
/home/zulip/deployments/current/manage.py audit_fts_indexes
```
9. [Upgrading from Debian 10 to 11](#upgrading-from-debian-10-to-11),
so that you are running a supported operating system.
## Upgrading PostgreSQL
Starting with Zulip 3.0, we use the latest available version of
PostgreSQL at installation time (currently version 14). Upgrades to
the version of PostgreSQL are no longer linked to upgrades of the
distribution; that is, you may opt to upgrade to PostgreSQL 14 while
running Ubuntu 20.04.
To upgrade the version of PostgreSQL on the Zulip server:
1. Upgrade your server to the latest Zulip release (at least 3.0).
1. Stop the server, as the `zulip` user:
```bash
# On Zulip before 4.0, use `supervisor stop all` instead
/home/zulip/deployments/current/scripts/stop-server
```
1. Take a backup, in case of any problems:
```bash
/home/zulip/deployments/current/manage.py backup --output=/home/zulip/postgresql-upgrade.backup.tar.gz
```
1. As root, run the database upgrade tool:
```bash
/home/zulip/deployments/current/scripts/setup/upgrade-postgresql
```
1. As the `zulip` user, start the server again:
```bash
# On Zulip before 4.0, use `restart-server` instead of `start-server` instead
/home/zulip/deployments/current/scripts/start-server
```
You should now be able to navigate to the Zulip server's URL and
confirm everything is working correctly.
[docker-upgrade]: https://github.com/zulip/docker-zulip#upgrading-the-zulip-container
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