Ansible – Installing RPM Packages Using rpm Application Instead of yum

yum interfaces with the online repository related to your version of CentOS.

rpm is the package manager and packaging format for applications developed for the Red Hat/CentOS platform. Your rpm command is installing a packaged that was downloaded and is not part of a yum repository.

In the Windows world, it's like the difference between Windows Update (yum) and downloading a piece of software and double-clicking an installer (rpm).

It also appears as though you're using a version of postgresql that is newer than the one available through the normal CentOS channels ("Base" and "Updates"). The package being installed by the yum command you listed is coming from a different third-party software repository.

It looks like you're using the postgres database packages provided directly be PostgreSQL instead of the ones that come via CentOS. The instructions and reasoning are detailled here.

As a result, you've been asked to prevent the version that's is distributed with CentOS from installing by using the exclude= statements you listed. This is a precautionary measure to avoid a conflict between the older version of postgresql from CentOS and the newer one you're installing.

You don't. You use yum so that it handles this situation cleanly. It operates perfectly well offline using RPM packages directly, provided that all the necessary dependencies are available or already installed.

1. Download the appropriate MariaDB RPMs to your USB stick or DVD-ROM.

   yumdownloader MariaDB-client MariaDB-common MariaDB-compat MariaDB-devel MariaDB-server MariaDB-shared
   

2. Take your USB stick or DVD-ROM to the target machine and copy them in.

3. Install them:

   yum --disablerepo=* -y install MariaDB-*.rpm