How to inspect dnf configuration

Inspect dnf configuration.

How to instruct dnf to skip confirmation dialog

Instruct dnf to skip confirmation dialog and assume yes for every question.

How to parse the fastest available dnf mirror data

Parse the fastest available dnf mirror data.

How to improve dnf download times

Improve dnf download times.

How to update Grub configuration on CentOS server

Simply update Grub on CentOS server.

June 7, 2021 · milosz · CentOS

How to get package URL on CentOS

Sometimes I need to get the package URL on CentOS to store it using Nexus Repository Manager. At first glance, it is not very obvious how to display package URLs, but the actual process is very simple.

April 21, 2021 · milosz · CentOS

How to dry-run CentOS upgrade process

Use tsflags plugin to test upgrade process before executing it.

April 16, 2021 · milosz · CentOS

How to lock specified packages from being updated

Use versionlock plugin to protect packages from being updated on the CentOS operating system.

February 10, 2021 · milosz · CentOS

How to check whether a full reboot is required

Determine whether a full CentOS 7 reboot is required and which services need to be restarted.

How to check available security updates

Check available security updates for CentOS 7.

How to manage RPM keyring

Today, I will show you how to manage RPM keyring on the CentOS operating system using a real life example.

How to temporarily stop auditd daemon

Disable auditd daemon during operating system image build process to prevent unnecessary log spikes.

How to alter configuration for specific yum repository

Alter configuration for specific yum repository.

How to list packages in specific yum repository

List packages in specific yum repository.

How to disable yum repository

Disable specific yum repository to prevent particular packages from installation or update.

How to use yum without downloading or updating metadata

Use yum without downloading or updating its metadata.

How to downgrade package using yum

Downgrade package using yum.

How to download RPM packages

Download RPM packages from YUM repository using additional yum utilities.

How to increase Google Cloud virtual machine disk size

Increase Google Cloud virtual machine instance disk size without service interruption.

How to disable Google Accounts daemon

Enforcing your own security policy that defines users, SSH keys, and sudo configuration inside custom templates based on official images in Google Cloud requires that you disable Google Accounts service, so it won’t get in the way.

CentOS 6 – _netdev fstab option and netfs service

Yesterday I had a small problem. I have added GlusterFS mount point to the fstab but filesystem wasn’t mounted automatically after I rebooted the operating system (CentOS).

How to relay selected mailboxes using ISPConfig 3

I hit an intriguing problem as I needed to relay selected mailboxes rather than the whole domain. I assume that you have already noticed that everything needs to happen on the same domain. It is rare and quite interesting task so I will quickly describe it here using ISPConfig 3 but beware as this is a very specific topic so I strongly suggest to investigate it further before applying any changes.

CentOS 6 – RepoForge and Advanced Policy Firewall

Hmm… Today I hit funny problem as I couldn’t install Advanced Policy Firewall from RepoForge (RPMforge) repository on CentOS 6. Fortunately the solution is trivial and doesn’t require any magic…

Brief note on the MySQL Master-Slave replication

What to do when you want to analyze data contained in database without overloading the server? The answer is simple as you can use MySQL Master-Slave replication to offload this task. I will describe it briefly here.

CentOS netinstall – Mirror URL

Couple days ago I decided to use netinstall CD to install CentOS but got somewhat surprised by the “URL Setup” step as I didn’t expect to enter full URL containing installation image.

April 7, 2013 · milosz · CentOS

CentOS – fping 3.3 plus Smokeping 2.6.8 equals to empty graphs

fping was updated last month (2012-08-19) to version 3.3. Output statistics were directed to stdout instead of stderr so Smokeping (2.6.8) was not updating RRD files as a result.

CentOS – How to manage system services

Short note on how to manage system services using CentOS.

How to integrate Roundcube Webmail with ISPConfig 3

Read requirements and follow installation instructions to integrate Roundcube with ISPConfig 3. Source code is available at GitHub

CentOS 6.2, phpMyAdmin, Apache 2.2 – Segmentation fault (11)

Today I installed phpMyAdmin on fresh CentOS 6.2 (with EPEL repository) and it was not working. Looking at Apache logs revealed only notice: [notice] child pid 41292 exit signal Segmentation fault (11) My Apache and PHP versions: $ httpd -v Server version: Apache/2.2.15 (Unix) Server built: Dec 8 2011 18:07:26 $ php -v PHP 5.3.3 (cli) (built: Jan 11 2012 19:30:40) Copyright (c) 1997-2010 The PHP Group Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies The problem was with eAccelerator PHP module.

CentOS/ISPConfig – Easy Postfix upgrade (with MySQL support)

If you are using ISPConfig on CentOS and don’t want to bother with self compiled postfix (because of MySQL support) then use CentOS Plus Repository.

How to exclude package from update on CentOS

Exclude package from an update on CentOS operating system.

How to get rid of slow CentOS mirrors on update

Get rid of slow CentOS mirrors on update.