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As of 15 April 2019, there is only one repository RPM per distro, and it includes repository information for all available PostgreSQL releases.

This change, announced by Devrim on the pgsql-pkg-yum mailing list, has some impacts.


Announce

The announce from Devrim may be found here.

  • Instead of having separate repo RPMs per PostgreSQL major version, we now have one single repo RPM that supports all supported PostgreSQL releases. The new packages obsolete the current ones.

  • The repo RPM version has been bumped to 42. Hopefully that will be the end of the “The repo RPM is 10-4, how can I find 10-7 repo rpm, so that I can install PostgreSQL 10.7?” type questions.

  • The “latest” suffix has been added to all repo RPMs.


Installation

Let’s see some impacts of those changes on CentOS 7.

As usual, go to https://www.postgresql.org/download/linux/redhat/ and chose the version (11), the platform (CentOS 7) and the architecture (x86_64) you want to install.

Today, you still get the link to the pgdg-centos11-11-2 rpm.

Let’s install it:

# yum install https://download.postgresql.org/pub/repos/yum/11/redhat/rhel-7-x86_64/pgdg-centos11-11-2.noarch.rpm
Loaded plugins: fastestmirror
pgdg-centos11-11-2.noarch.rpm
Examining /var/tmp/yum-root-5eSWGp/pgdg-centos11-11-2.noarch.rpm: pgdg-redhat-repo-42.0-4.noarch
Marking /var/tmp/yum-root-5eSWGp/pgdg-centos11-11-2.noarch.rpm to be installed

Resolving Dependencies
--> Running transaction check
---> Package pgdg-redhat-repo.noarch 0:42.0-4 will be installed
--> Finished Dependency Resolution

Dependencies Resolved
========================================================================================================
 Package                   Arch            Version            Repository                           Size
========================================================================================================
Installing:
 pgdg-redhat-repo          noarch          42.0-4             /pgdg-centos11-11-2.noarch          6.8 k

Transaction Summary
========================================================================================================
Install  1 Package

Total size: 6.8 k
Installed size: 6.8 k

In fact, the new pgdg-redhat-repo rpm will be installed…

The yum .repo file will now contains the urls of all supported PostgreSQL releases:

# cat /etc/yum.repos.d/pgdg-redhat-all.repo |grep "\["
[pgdg12]
[pgdg11]
[pgdg10]
[pgdg96]
[pgdg95]
[pgdg94]
...

The repositories for version 9.4 to 11 are enabled by default.

The PostgreSQL packages are then easily reachable and you might even install two different releases at once:

# yum install postgresql11-server postgresql10-server
...

Dependencies Resolved
========================================================================================================
 Package                        Arch              Version                       Repository         Size
========================================================================================================
Installing:
 postgresql10-server            x86_64            10.7-2PGDG.rhel7              pgdg10            4.5 M
 postgresql11-server            x86_64            11.2-2PGDG.rhel7              pgdg11            4.7 M
Installing for dependencies:
 libicu                         x86_64            50.1.2-17.el7                 base              6.9 M
 postgresql10                   x86_64            10.7-2PGDG.rhel7              pgdg10            1.6 M
 postgresql10-libs              x86_64            10.7-2PGDG.rhel7              pgdg10            355 k
 postgresql11                   x86_64            11.2-2PGDG.rhel7              pgdg11            1.6 M
 postgresql11-libs              x86_64            11.2-2PGDG.rhel7              pgdg11            360 k

Transaction Summary
========================================================================================================
Install  2 Packages (+5 Dependent packages)

Total download size: 20 M
Installed size: 80 M

To simplify blog posts or automated scripts, you might easily use the simlink to the actual latest repo RPM:

https://download.postgresql.org/pub/repos/yum/11/redhat/rhel-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm

Updates

This change also has an impact on existing installations.

On, for example, an existing v11 installation:

# cat /etc/yum.repos.d/pgdg-11-centos.repo |grep "\["
[pgdg11]
...

The update operation will replace the old pgdg-centos11 rpm by the new one and create the new .repo file:

# yum update pgdg-centos11
...
Resolving Dependencies
--> Running transaction check
---> Package pgdg-centos11.noarch 0:11-2 will be obsoleted
---> Package pgdg-redhat-repo.noarch 0:42.0-4 will be obsoleting
--> Finished Dependency Resolution

Dependencies Resolved
========================================================================================================
 Package                        Arch                 Version                 Repository            Size
========================================================================================================
Installing:
 pgdg-redhat-repo               noarch               42.0-4                  pgdg11               5.6 k
     replacing  pgdg-centos11.noarch 11-2

Transaction Summary
========================================================================================================
Install  1 Package

Total download size: 5.6 k

EOL’d releases

While the yum repositories for EOL’d releases still exist, the repo rpms usually found on https://yum.postgresql.org/repopackages.php#pg93 aren’t available anymore: 404 - Not Found.

In case you need to use the old repositories, you can add it manually:

# cat /etc/yum.repos.d/pgdg-93-centos.repo 
[pgdg93]
name=PostgreSQL 9.3 $releasever - $basearch
baseurl=https://download.postgresql.org/pub/repos/yum/9.3/redhat/rhel-$releasever-$basearch
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-PGDG-93

[pgdg93-source]
name=PostgreSQL 9.3 $releasever - $basearch - Source
failovermethod=priority
baseurl=https://download.postgresql.org/pub/repos/yum/srpms/9.3/redhat/rhel-$releasever-$basearch
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-PGDG-93

Of course, since those releases are not supported anymore, you shouldn’t have to use it anymore…


Conclusion

While this change is still new, it will make our lives easier in the future…