Re: How do the Linux distributions create the Linux user/group "postgres"?

On 1/9/23 07:15, Joe Conway wrote:
> On 1/9/23 07:41, Matthias Apitz wrote:
>> Please note: I'm talking about the user and group "postgres" in the
>> Linux OS and not in the PostgreSQL server.
>>
>> We're compiling PostgreSQL from source (actually 14.1) and distribute that
>> to our customers. They're asked to setup user and group "postgres"
>> before creating the cluster. As nowadays there are a lot of setup such
>> things in bigger installations, like LDAP or AD, etc. I'd like to know
>> how other installations for Linux deal with this?
>
> See for example the PGDG RPM spec file:
>
> https://git.postgresql.org/gitweb/?p=pgrpms.git;a=blob;f=rpm/redhat/main/non-common/postgresql-15/main/postgresql-15.spec;h=60cd42147a7563ba76c401643d0a7c79b59d2520;hb=HEAD
>
>
> 8<-------------------
> %pre server
> groupadd -g 26 -o -r postgres >/dev/null 2>&1 || :
> useradd -M -g postgres -o -r -d /var/lib/pgsql -s /bin/bash \
>     -c "PostgreSQL Server" -u 26 postgres >/dev/null 2>&1 || :
> 8<-------------------

What if (for example in an already-installed package) uid and gid 26 already
exist?

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Born in Arizona, moved to Babylonia.