How To Enable/Disable Firewall On Centos / RedHat / Fedora

May 18, 2011

Iptables should be installed by default on all CentOS 3.x, 4.x and 5.x installations. You can check to see if iptables is installed on your system by: # rpm -q iptables

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How To Flush Sendmail Queue In Linux

May 16, 2011

Check pending mail To check how many pending mail, type the following command # mailq

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How to Manage Postfix Mailbox Size

May 15, 2011

How do you managing the mailbox size for users configured with the Postfix mail server ?. And how to avoid “error writing message: File too large” ?

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10 lsof Command Examples

May 14, 2011

The lsof command or “list open files” command in Linux is a powerful tool. In Linux and Unix everything behind the scenes are just files. This includes IP sockets, pipes, unix sockets, directories, devices, even inodes are just files. This means that lsof can actually tell you a lot of information of what is going […]

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How To Add/Create Swap File

May 14, 2011

If you need additional swap space to improve your system performance. You have two different ways: add/upgrade a swap partition or create a swap file. But changing the size or create a new swap partition is not easy, the best solution is to create a new swap file. This articles help you add/create swap file […]

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