RRDTOOL is required by many network utilities, e.g cacti, nagios & many others to plot graphs. By default rrdtool is not included in CentOS. You may need to install it for monitoring purpose. You can either use source to compile or install using rpm. To install using rpm all you need is following two commands. [...]
Full Story »Easiest way to Install / Upgrade Thunderbird on Ubuntu / Fedora
Mozilla provides Linux packages for Firefox / Thunderbird, but many of users prefer using packages available with distro. As a result you need to wait until your favorite disto release latest rpm / deb or find alternative repo to get latest packages. Rather hunting you may start using TAR packages available at mozilla. You can [...]
Full Story »PXE Boot server on CentOS
This post will be helpful for linux admins who frequently installs diff linux os. PXE boot is one of the best option to start linux installation & for rescue of the other failed systems. we are using CentOS as pxe boot server. install syslinux & tftp-server yum install tftp-server syslinux -y enable syslinux at boot [...]
Full Story »Create Local yum repo for CentOS OS Upgrade
This article is for those sysadmins who wish to save their bandwidth / time by creating local repo of CentOS-5.5 and using it to upgrade rest of the servers. In many countries bandwidth is not cheap. Also upgrading all old version of CentOS installation from Internet is not viable option. To save time & bandwidth [...]
Full Story »Upgrade CentOS using Yum
This procedure works with latest version of centos, CentOS 5.5 is released. you may wish to upgrade to 5.5. use following commands to upgrade from centos 5.3 & centos 5.4 to centos 5.5 For Upgrade yum update -y To Verify rpm -qa | grep centos-release On reboot you’ll find latest version of centos with kernel [...]
Full Story »Save Power using Wake On Lan
Apart from Virtulization we can shut servers whenever it is not being used to save power. At my office, we used to keep Antivirus server running 24×7, to get latest definition updates & to let users fetch. This was not necessary to keep server ON whole night as there was no user. Also we had [...]
Full Story »Yum – How to Exclude package update
In previous post we have covered openoffice-3.2 installation, by mow many must have noticed while running yum update, yum is trying to upgrade openoffice.org-ure-1.6.0-9483.i586.rpm which belongs to openoffice-3.2 installation. This package is being replaced by openoffice.org-ure-3.1.1-19.14.fc12.i686 as a result openoffice does not work, to fix you need to reinstall openoffice.org-ure-1.6.0-9483.i586.rpm. To avoid it further, you [...]
Full Story »Apache Web using POP3 Auth
One fine day one the project leader asked that he we to share files over internet to employees, he was looking for some auth system where only existing employee can login. Since we have hosted mail server & no auth system in office the convenient way we found was to use POP3 Auth. Following is [...]
Full Story »Resize LVM -Centos
Here We are sharing guide to resize LVM size. create new partition (partition id should be 8e Linux LVM) ADD PHYSICAL VOLUME pvcreate /dev/new_partition Verify new physical volume pvdisplay Or pvscan Extend existing VOLUME GROUP vgextend VolGroup00 /dev/xvda3 make sure vg free size is = new partition size using vgdisplay command Extend existing LVM by [...]
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