CentOS 6 HowTo - Linux / Unix Q & A from nixCraft

Disable SELinux on CentOS 7 / RHEL 7 / Fedora Linux

last updated July 18, 2019 in CentOS, Linux, RedHat and Friends, SELinux

I need to disable SELinux on CentOS 7. How can I disable SELinux from the command line over ssh based session?

How to disable fast mirror yum plugin in CentOS Linux server

last updated April 26, 2017 in CentOS, Fedora Linux, Linux

This might sound little crazy, but I want to disable yum plugin called the fast mirror. It always selects mirror hosted in my country which is very slow. As a result of all my yum command download file at 4-8Kb/s only. I am also behind a proxy server. How do I disable the fastest mirror plugin on CentOS Linux 6 or 7 server?

CentOS / RHEL 6: Install Suhosin PHP Advanced Protection System

last updated November 18, 2015 in Apache, CentOS, Linux, PHP, RedHat and Friends

Suhosin is an open source patch for PHP. How do I install suhosin under CentOS / Red Hat Enterprise Linux server running on my IBM server?

yum Command: List The Contents (Files) Of A Package on Linux

last updated January 13, 2018 in CentOS, Linux, RedHat and Friends, Suse

The rpm -qi command list the files of a package. How do I use yum command to list the contents of a package under a CentOS or RHEL installed on IBM server hardware? How to list the contents of a package using yum command?

CentOS / RHEL: Change / Copy File SELinux Security Context Command

last updated December 28, 2011 in CentOS, RedHat and Friends

I‘ve created a file as follows:

ls -l -Z /etc/cron.d/vnstat
-rw-r–r–. root root system_u:object_r:system_cron_spool_t:s0 /etc/cron.d/vnstat

I’ve created a new file /etc/cron.d/vnstat.custom.interface:

ls -l -Z /etc/cron.d/vnstat.custom.interface
-rw-r–r–. root root unconfined_u:object_r:system_cron_spool_t:s0 /etc/cron.d/vnstat.custom.interface

The /etc/cron.d/vnstat is part of default vnstat package. I’ve installed my own version of the same. But, due to SELinux security cron job is not running. How do I change file SELinux security contex under RHEL / CentOS 6 Linux server to system_u:object_r:system_cron_spool_t:s0 from unconfined_u:object_r:system_cron_spool_t:s0 for /etc/cron.d/vnstat.custom.interface file?

RHEL / CentOS Yum Command: Blacklist Packages [ Disable Certain Packages ]

last updated December 31, 2011 in RedHat and Friends

How do I force yum command to disable certain packages from being installed using certain repos such as EPEL under RHEL or CentOS Linux 6.x server?

memcached: Failed To Set rlimit For Open Files Error and Solution

last updated October 11, 2011 in CentOS, RedHat and Friends, Troubleshooting

I‘m using RHEL 6 / CentOS 6.x and install the memcached server. However, whey I try to start the server using service memcached start command, I get the following error:

Starting memcached: failed to set rlimit for open files. Try running as root or requesting smaller maxconns value. [FAILED]

How do I fix this problem?