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

HowTo: Prevent Yum From Upgrading The Kernel On a CentOS / Red Hat Enterprise Linux

last updated February 19, 2014 in CentOS, Package Management, RedHat and Friends

I am a new RHEL / Centos Linux server admin. I would like yum to update all packages except the Linux Kernel. How can I prevent yum command from updating kernel on a CentOS/RHEL/Fedora Linux based systems?

Linux Change Password Using passwd Command Over SSH

last updated January 7, 2018 in Commands, Linux, OpenBSD, UNIX

I‘m a new Ubutnu Linux user. I backup files to our corporate Unix backup server using the rsync command. The server only allow to upload/download files. I am unable to login to the server. How do change my password using the passwd command over ssh based session?

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?

How To Listen Pandora In Europe Outside USA Using Proxy

last updated January 19, 2018 in Squid

I have Pandora Internet Radio One subscription, and recently I moved to Europe for a few months as part of my work schedule. The service fully available only in the United States. How do I access Pandora one service in Europe? Can I get around it by using a proxy server installed on my own server located in USA at home or ISP data center?

CentOS / RHEL: Disable or Enable SELinux Policy Modules

last updated May 6, 2012 in RedHat and Friends

How do I disable or enable SELinux policy modules under Red Hat Enterprise Linux running on Dell hardware?

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?