Re: [GENERAL] psql - looking in wrong place for socket

On 03/17/2017 06:58 AM, Steve Clark wrote:
> On 03/17/2017 09:49 AM, Adrian Klaver wrote:
>> On 03/17/2017 06:42 AM, Steve Clark wrote:
>>> Hi List,
>>>
>>> I am running postgresql 8.4.20 on CentOS 6. Things have been running fine for a long time
>>> then I rebooted. Postgres came up but when I tried to connect with psql on the local machine
>>> I got
>>>
>>> psql: could not connect to server: No such file or directory
>>>         Is the server running locally and accepting
>>>         connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?
>>>
>>> The socket is actually being created (and always has been) in /tmp
>> So you built Postgres from source?
> No - it is installed using yum.
>
> It looks like the problem is someone loaded postgresql-9.5 and psql was
> using:
> psql    14971 postgres  mem    REG                8,4   193296   950807
> /usr/pgsql-9.5/lib/libpq.so.5.8
>
> the libpq from 9.5.
>
> By removing the ln and using
>
> # rm /var/run/postgresql/.s.PGSQL.5432
> rm: remove symbolic link `/var/run/postgresql/.s.PGSQL.5432'? y
>
> $ psql
> psql: could not connect to server: No such file or directory
>         Is the server running locally and accepting
>         connections on Unix domain socket
> "/var/run/postgresql/.s.PGSQL.5432"?
>
> $ LD_LIBRARY_PATH=/usr/lib64 psql
> psql (8.4.20)

You probably already know, but 8.4 is ~2 1/2 past EOL. Also the last
release in that series was 8.4.22.

> Type "help" for help.
>
> postgres=#
>
> It works OK again.
>
> So now I know what caused the problem.
>
> Thanks,
> Steve
>>> I worked around the problem temporarily by
>>> ln -s /tmp/.s.PGSQL.5432 /var/run/postgresql/.s.PGSQL.5432
>>>
>>> What controls where psql looks for the socket?
>> https://www.postgresql.org/message-id/23876.1488949292%40sss.pgh.pa.us
>>
>> "With the default configure options you used, the postmaster would have
>> put its Unix socket file into /tmp, not /var/run.  I wonder whether your
>> problem is that you're trying to connect to it with distro-supplied
>> psql+libpq that expects to find the Unix socket in /var/run."
>>
>>
>>
>>> Thanks,
>>> Steve
>>>
>>>
>>>
>>>
>>
>
>
> --
> Stephen Clark
> *NetWolves Managed Services, LLC.*
> Director of Technology
> Phone: 813-579-3200
> Fax: 813-882-0209
> Email: steve.clark@netwolves.com
> http://www.netwolves.com


--
Adrian Klaver
adrian.klaver@aklaver.com