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====== Fedora, Redhat & CentOS ======

  * [[CentOS + Nginx + Backuppc4.x]]
  * [[ Default kernel ]]

==== My Repo ====
 I did not yet implemented GPG Key.
<code bash>
  [K2 - Perl]
  name=K2 - Perl
  baseurl=http://rpm.k2patel.in:1111/centos/$releasever/perl/$basearch/
  enabled=1
  gpgcheck=0
  
  [K2 - Update]
  name=K2 - Update
  baseurl=http://rpm.k2patel.in:1111/centos/$releasever/updates/$basearch/
  enabled=1
  gpgcheck=0
</code>

==== PHP5.2.10 ====
use following centOS dev wiki
<code bash>
  [c5-testing]
  name=CentOS-5 Testing
  baseurl=http://dev.centos.org/centos/$releasever/testing/$basearch/
  enabled=1
  gpgcheck=1
  gpgkey=http://dev.centos.org/centos/RPM-GPG-KEY-CentOS-testing
  includepkgs=php*
</code>

==== Kickstart ====
[[ http://www.centos.org/docs/5/html/5.2/Installation_Guide/s1-kickstart2-whatis.html | Kickstart ]]


==== Yum ====
Little more advance information not needed on regular basis.

//list all installed GPG Key//
<code bash>
rpm -q gpg-pubkey --qf '%{name}-%{version}-%{release} --> %{summary}\n'
</code>

//Remove unnecessary keys from yum / rpm//
<code bash>
rpm -e gpg-pubkey-443e1821-421f218f gpg-pubkey-a3901351-4e1b6312
</code>

//How to limit packages and setup priority on exclude include packages.//
<code bash>
[Atomi-OSSEC]
name=OSSEC
baseurl=http://www6.atomicorp.com/channels/atomic/centos/5EL/x86_64/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-OSSEC
includepkgs=ossec*,mysql*
excludepkgs=*
includepkgorder=includepkg,excludepkg
</code>


==== How do I disable IPv6? ====

Edit /etc/sysconfig/network and set "NETWORKING_IPV6" to "no"\\
For 5.4 and later, replace in /etc/modprobe.conf\\
<code bash>
alias ipv6 off
</code>
by
<code bash>
options ipv6 disable=1
</code>
== Alternative (which might be easier and works on any release with /etc/modprobe.d): ==

<code txt>
# touch /etc/modprobe.d/disable-ipv6.conf
# echo "install ipv6 /bin/true" >> /etc/modprobe.d/disable-ipv6.conf 
</code>

For CentOS 5.3 or older, add the following to /etc/modprobe.conf : 
<code bash>
alias ipv6 off
alias net-pf-10 off
</code>
Run /sbin/chkconfig ip6tables off to disable the IPv6 firewall, Reboot the system 

:!: With the 5.4 update symbol/ipv6 module dependency capabilities have been introduced; therefore, if IPv6 has been previously disabled as above an upgrade to the bonding driver in 5.4 will result in the bonding kernel module failing to load. For the module to load properly use instead:

<code txt>
# touch /etc/modprobe.d/disable-ipv6.conf
# echo "options ipv6 disable=1" >> /etc/modprobe.d/disable-ipv6.conf 
</code>

:!: Upstream employee Daniel Walsh recommends not disabling the ipv6 module but adding the following to /etc/sysctl.conf:
<code bash>
net.ipv6.conf.all.disable_ipv6 = 1
</code>

==== Package require for X Forwarding ====
Following packages requires for minimal OS install and X Forwarding.

<code bash>
yum install xorg-x11-xauth xorg-x11-fonts-* xorg-x11-utils
</code>

==== rc.local not working ====
Since RHEL 7, by default rc.local is disabled.\\
:!: check permission is 755 on /etc/rc.d/rc.local
<code bash>
systemctl enable rc-local
systemctl start rc-local
</code>