centos

Firewall

Firewall
CentOS 7 uses FirewallD to configure the necessary ports:

firewall-cmd --zone=public --add-port=80/tcp --permanent
firewall-cmd --zone=public --add-port=443/tcp --permanent
firewall-cmd --reload

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Mounting Disks

How to mount a Logical Volume

Resources
How to Mount a Logical Volume

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RPM Repositories

http://wiki.centos.org/AdditionalResources/Repositories
http://wiki.centos.org/PackageManagement/Yum/Priorities

  • EPEL (Extra Packages for Enterprise Linux) is a volunteer-based community effort from the Fedora project to create a repository of high-quality add-on packages that complement the Fedora-based Red Hat Enterprise Linux (RHEL) and its compatible spinoffs, such as CentOS and Scientific Linux.

    rpm -Uvh http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-3.noarch.rpm

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Hostname

How to change your server's hostname

The file /etc/sysconfig/network contains the hostname that you need to change. The file will look something like this:

NETWORKING="yes"
NETWORKING_IPV6=no
HOSTNAME="www.example.com"

This change won't take affect until the next reboot, but you can make the change happen immediately using the hostname command like so:

hostname ftp.example.com

You may also need to add/change the hostname in the /etc/hosts file. By default this should look something like this:

Technology:

IBM System x3550 with CentOS

Running CentOS 5.2 on an IBM System x3550 7978EHU.

UpdateXpress System Pack Installer

mkdir -p /extra/ibm/updates
cd /extra/ibm

Download the UpdateXpress System Pack Installer.

chmod ugo+x install201.rhel5
./install201.rhel5 ac -l /extra/ibm/updates

To get the UXSPI to install the updates it downloads, you need to edit /etc/redhat-release so that it sees the system as RHEL5 instead of CentOS 5. Change:

CentOS release 5.2 (Final)

to:

Red Hat Enterprise Linux Server release 5 (Tikanga)

Then you can run the installer with:

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CentOS 4 and older megaraid driver

Getting a Dell PowerEdge 4300 with a PERC2 card to function under Centos 4.

http://www.tuxyturvy.com/blog/index.php?/archives/4-Installing-RHEL4-on-Systems-with-Legacy-Megaraid-Drivers.html

Dell PowerEdge 4300 server.
CentOS 4.4 (because that one has a single server CD installer).
Compiling the megaraid driver
Install the appropriate kernel-devel for your installation media. In the case of CentOS 4.4, that was 2.6.9-42. This machine was also a multiprocessor model, so the smp version was needed. CentOS needs 586 versions for the installer but needs 686 versions in order to run, so both will need to be compiled.

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CentOS

My preferred Linux operating system is CentOS, a derivative of the commercial RedHat Enterprise Linux. It gives a RedHat-style distro with stability and an active support community. CentOS is a much better choice for a server than a bleeding edge distro such as Fedora.

A nice distro to use for a server is CentOS. It's built upon Redhat Enterprise Linux so it provides a "Redhat" style distro while being stable and well-tested. A more "cutting-edge" distro such as Ubuntu or Fedora isn't stable enough for practical use as a server – too many updates being regularly pushed out.

Alternative - Scientific Linux

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Operating System

The mail server is built upon the CentOS operating system, a free distro based upon RedHat Enterprise Linux.

A nice distro to use for the server is CentOS. It's built upon Redhat Enterprise Linux so it provides a "Redhat" style distro while being stable and well-tested. A more "cutting-edge" distro such as Ubuntu or Fedora aren't stable enough for practical use as a server – too many updates being regularly pushed out.

Installation

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