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

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?

Linux Deleting Firewall Rules

last updated June 28, 2012 in Iptables

I would like to to delete my iptables based firewall rules under Linux. How do I delete rules individually or all at once under CentOS or Fedora Linux or RHEL based servers?