Hands on with an Exim Cheatsheet!

A DHCP Server assigns IP addresses to client computers. This is very often used in enterprise networks to reduce configuration efforts. All IP addresses of all computers are stored in a database that resides on a server machine.A DHCP server can provide configuration settings using two methods

Default to highlighting search string when using grep by adding the below alias to ~/.bashrc file:

Presto is a project that aims to utilize the work done on deltarpm to provide faster, smaller size downloads to Fedora users. Not only will using yum-presto save lots of bandwidth, but it will cut down on the time it takes to perform updates...

1. Start screen using the command:
   $ screen -S <SessionName>

   The -S switch gives the session a name, which makes multiple screen sessions easier to manage.

2. Allow multiuser access in the screen session:
   CTRL-A
:multiuser on

3. Grant permission to the guest user to access the screen session:
   CTRL-A
:acladd <guest_user>

4. The guest user can now connect via:
   $ screen -x <host_user>/<SessionName>

MySQLTuner is a script written in Perl that will assist you with your MySQL configuration and make recommendations for increased performance and stability. Within seconds, it will display statistics about your MySQL installation and the areas where it can be improved.

Along with mii-tool, mii-diag and ethtool for NIC diagnostics... the NIC (NIC Information Collector) script collects network information necessary to investigate network related problems.

Cacti is a complete network graphing solution designed to harness the power of RRDTool’s data storage and graphing functionality. Cacti provides a fast poller, advanced graph templating, multiple data acquisition methods, and user management features out of the box. All of this is wrapped in an intuitive, easy to use interface that makes sense for
LAN-sized installations up to complex networks with hundreds of devices.

With the recent update of uw-imap from epel repository to uw-imap-2007d-1.el5, I was getting the below error which indicated that uw-imap required 2007d version of c-client.

Below was the error message as logged in "/var/log/messages":

Adding "libc-client2007" to the list of "includepkgs" in yum conf for epel repository and doing a `yum update` resolved the issue by updating libc-client2007-2007b to libc-client2007-2007d.

Very helpful when unsure on using the type of comparison operators and brackets to use in bash.