I have a question regarding following output:

[nikola@192 ~] $ sudo su - postgres
[postgres@192 ~] $ psql dvdrental postgres
psql: /usr/pgsql-11/lib/libpq.so.5: no version information available (required by psql)
psql: /usr/pgsql-11/lib/libpq.so.5: no version information available (required by psql)
psql (11.7, server 11.8)
Type "help" for help.


What do following two messages stand for and why? Messages I am asking about:

  1. psql: /usr/pgsql-11/lib/libpq.so.5: no version information available (required by psql)
  2. psql (11.7, server 11.8) - BTW, for this psql --version command I get following output: psql (PostgreSQL) 11.8 (had to install PostgreSQL Server version 11.7 in order to perform command such as \dt and \l) ...and also this output:
postgres=# select * FROM version();
 PostgreSQL 11.8 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 9.3.1 20200408 (Red Hat 9.3.1-2), 64-bit
(1 row)

P.S. I'm running PostgreSQL 11.8 on Fedora 30.

UPDATE1: As requested by @LaurenzAlbe output for rpm -qa|grep postgres command is:

[nikola@192 ~] $ rpm -qa|grep postgres


I've ran dnf remove postgresql postgresql-server command -> databases are still there and I can access them via pgAdmin4 and psql: /usr/pgsql-11/lib/libpq.so.5: no version information available (required by psql message is no longer showing up. But, there is now new issue -> when I access postgres shell in terminal using sudo su - postgres command and then perform psql some-database-name postgres I get message

bash: psql: command not found...
Install package 'postgresql' to provide command 'psql'? [N/y]

I presume this is asking me to install AGAIN Fedora package which in 1st place I am trying to get rid off (to not show psql: /usr/pgsql-11/lib/libpq.so.5: no version information available (required by psql) message).

Any suggestion how to solve this without installing Fedora package but from PostgreSQL Global Development group?

P.S. BTW, I've installed Postgres server by following this link which uses PGDG packages (but something didn't work right on my machine and I guess I've been offered by Fedora30 OS to install Fedora packages which is obviously what I did :) ).

  • Could you add the result of this to the question: rpm -qa|grep postgres Jun 19 '20 at 10:27
  • Hi Laurenz, I've updated my question as you asked. Please take a look
    – NikolaS
    Jun 19 '20 at 12:02

You have installed a mixture of packets: some from the Fedora distribution, some from the PostgreSQL Global Development group.

These don't work well together. In particular, you have psql from the Fedora packages in the PATH, but libpq from the PGDG packages is on the library path.

That explains your question #2.

Ad question #1: that warning is printed if the library version of the installed library is lower than the one the software was linked with.

Remove the Fedora packages to get rid of the problem:

dnf remove postgresql postgresql-server

I hope that puts the correct psql on your PATH; if not, reinstall the postgresql11 package.

  • Will removing Fedora packages effect my pgAdmin4 configuration...I mean will I loose all my databases (if yes what should I do to save them -> only perform pg_dump for all databases for my postgresql cluster or something else)? Thank you in advance.
    – NikolaS
    Jun 19 '20 at 13:03
  • 1
    Removing packages won't remove a database, but you should definitely figure out which software is running your database. That might require someone who knows something about PostgreSQL. Dumping the database and restoring it afterwards is the safe way. Jun 19 '20 at 13:13
  • I will definitely backup my databases, but is there any command to execute in terminal in order to find out which software is running my database? BTW, I'm using Postgres as my primary database for projects used for my Master Thesis.
    – NikolaS
    Jun 19 '20 at 14:52
  • The ps command will show that. Jun 19 '20 at 14:53
  • Tried what you suggested (to remove Fedora packages). Please take a look on updated question under UPDATE2 section
    – NikolaS
    Jun 19 '20 at 16:36

After experimenting and trying out suggestions made by @Laurenz Albe I've managed to reach solution.

Solution after performing mentioned steps in my question to do one more additional step which is to run sudo dnf reinstall pacakage_name (package_name is one of three below mentioned packages ) command for following packages:

[nikola@192 ~] $ rpm -qa|grep postgres

After that everything works as it should.

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