Postgres Extesions Not Available - CentOS 8

Question

I have recently installed PostgreSQL 12 on My CentOS 8 Machine. It seems that there are not Extensions available, and when I try to create one I receive the following error:

[lloyd@localhost postgres]$ PATH=/home/lloyd/opt/GNAT/2019/bin:$PATH
[lloyd@localhost postgres]$ sudo -u postgres psql
[sudo] password for lloyd: 
could not change directory to "/home/lloyd/gnatcoll-db-20.0/postgres": Permission denied
psql (12.4)
Type "help" for help.

postgres=# \dx
                 List of installed extensions
  Name   | Version |   Schema   |         Description          
---------+---------+------------+------------------------------
 plpgsql | 1.0     | pg_catalog | PL/pgSQL procedural language
(1 row)

postgres=# CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
ERROR:  could not open extension control file "/usr/pgsql-12/share/extension/uuid-ossp.control": No such file or directory
postgres=# 

Any help as to why this is happening would be greatly appreciated.

Thanks, Lloyd

Answer 1

For anyone else who stumbles across this issue, this is happening because you need to install the contrib package first, before gaining access to the uuid-ossp package.

First, ssh into your server and install postgresql12-contrib by running the following: Note: I had postgres12 installed and as a result installed postgresql12-contrib instead of postgresql-contrib because postgresql-contrib installs what looks like postgresql10-contrib .

sudo dnf install postgresql12-contrib

Be sure that this is the correct version of contrib for your version of postgresql by making sure that the output of the install you see something like:

postgresql<your-version>-contrib-XX-1PGDG.rhel8.x86_64.rpm

Now, you should be able to add your extension!

CREATE EXTENSION IF NOT EXISTS "uuid-ossp";