In this CentOS 5.5 tutorial we will be showing you how to change the hostname. The assumption is that you are running as root and have a basic understanding of the software required but if you follow this tutorial you should be able to complete the task successfully.
To find the machine’s fully qualifier domain name (FQDN) see for yourself how the machine identifies itself:
# uname -n
centos01.how2centos.com
# dnsdomainname
how2centos.com
In this CentOS 5.5 tutorial we will be installing Foreman on a CentOS 5.5 i386 server including Puppet Master and Puppet client. The assumption is that you have a basic to medium understanding of the software required but if you follow this tutorial you should be able to complete the task successfully.
A bit on the software that we’ll be using:
Foreman
Foreman is aimed to be a Single Address For All Machines Life Cycle Management.
Foreman integrates with Puppet (and acts as web front end to it).
Foreman takes care of bare bone provisioning until the point puppet is running, allowing Puppet to do what it does best.
Foreman shows you Systems Inventory (based on Facter) and provides real time information about hosts status based on Puppet reports.
Foreman creates everything you need when adding a new machine to your network. It’s goal being automatically managing everything you would normally manage manually – that would eventually include DNS, DHCP, TFTP, PuppetCA, CMDB and everything else you might consider useful.
With Foreman You Can Always Rebuild Your Machines From Scratch!
Foreman is designed to work in a large enterprise, where multiple domains, subnets and puppetmasters are required.
A quick post to share this mostly unknown gem that Dell manages it’s own Open Manage Linux Repository.
Read more: http://linux.dell.com/wiki/index.php/Repository/OMSA
To get your CentOS server installed with Server Administrator set up the Dell Open Manage Repository like so:
# wget -q -O – http://linux.dell.com/repo/hardware/latest/bootstrap.cgi | bash
Then install the Server Administrator
# yum install srvadmin-all
Finally browse to your newly installed Open Manage Server Administrator and monitor your Dell hardware.
https://your.Centos.Server:1311/
Log on screen – Use your root username and password
Main Screen after log on
TIP: After installing the Dell Server Administrator get your service tag number from your CentOS Linux server by running
# dmidecode -s system-serial-number
ABCDEF1
In this CentOS 5.5 tutorial we will be installing Smokeping and SmokeTrace on a CentOS 5.5 i386 server. The assumption is that you have a basic to medium understanding of Apache but if you follow this tutorial you should be able to complete the task successfully.
A bit on the software that we’ll be using:
Smokeping
SmokePing keeps track of your network latency:
* Best of breed latency visualisation.
* Interactive graph explorer.
* Wide range of latency measurment plugins.
* Master/Slave System for distributed measurement.
* Highly configurable alerting system.
* Live Latency Charts with the most ‘interesting’ graphs.
* Free and OpenSource Software written in Perl written by Tobi Oetiker, the creator of MRTG and RRDtool
http://oss.oetiker.ch/smokeping/
Preliminary Note:
I am using a CentOS 5.5 i386 base installation in this tutorial.
* www.how2centos.com (IP 10.0.0.100): CentOS 5.5 i386 base installation
