I am trying to monitor available updates on a CentOS 7 system. Now I had the impression that yum updateinfo gives exactly that, and sometimes it does, but right now on one machine it says

Updates Information Summary: updates 1 Security notice(s) 3 Bugfix notice(s) 1 Enhancement notice(s)

Which looks as if there are 5 updates available, but actually yum update and yum check-update report 60 packages that are supposed to be upgraded.

Is yum check-update then the only way to find out all possible updateable packages?

2 Answers

Why does yum updateinfo not show all updates? It gives different info by design.

It looks like you submitted yum updateinfo summary updates, which shows advisory information, as is apparent by looking at the output and according to man yum:

* updates Is used to display information about advisories for packages that can be updated. This is the default.

On the other hand, according to its documentation, yum check-update does this:

This command allows you to determine whether any updates are available for your installed packages. yum returns a list of all package updates from all repositories if any are available.

1

According to the following redhat solution article, you can use updateinfo in a number of ways to get information on security-related updates.

NOTE: For systems running older versions than RHEL7/CentOS7, the yum-plugin-security package (plugin) is required.

Looks like you want is one of the following:

yum info-sec

Shows available security updates verbosely

yum updateinfo list

Shows available advisories

yum updateinfo RHSA-2018:2285

Shows the specific advisory

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