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installer: Halt if wrong version of PostgreSQL is already installed.

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49a7a66004 and immediately previous commits began installing
PostgreSQL 12 from their apt repository.  On machines which already
have the distribution-provided version of PostgreSQL installed,
however, this leads to failure to apply puppet when restarting
PostgreSQL 12, as both attempt to claim the same port.

During installation, if we will be installing PostgreSQL, look for
other versions than what we will install, and abort if they are
found.  This is safer than attempting to automatically uninstall or
reconfigure existing databases.
This commit is contained in:
Alex Vandiver
2020-06-23 06:57:14 +00:00
committed by Tim Abbott
parent 814198d649
commit 31f1f10501
2 changed files with 40 additions and 2 deletions
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11
docs/production/install-existing-server.md
View File

@@ -62,9 +62,16 @@ $ sudo service puppet-agent stop
$ sudo service puppet stop
```
### Postgres
### PostgreSQL
If you have an existing postgres database, note that Zulip will use
Zulip expects to install PostgreSQL 12, and find that listening on
port 5432; any other version of PostgreSQL that is detected at install
time will cause the install to abort. If you already have PostgreSQL
installed, you can pass `--postgres-version=` to the installer to have
it use that version. It will replace the package with the latest from
the PostgreSQL apt repository, but existing data will be retained.
If you have an existing PostgreSQL database, note that Zulip will use
the default `main` as its database name; make sure you're not using
that.