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Formula for calculating the swap partition size during the installation of Red Hat Enterprise Linux

Andrew Lin — Wed, 13 May 2009 01:30:26 +0000

When performing the installation of Red Hat Enterprise Linux or Fedora, you can accept the default size of the swap partition or enter the optimal size manually. Here is the formula to calculate the swap partition size.

If total memory (RAM) < 2 GB

swap size = total memory x 2

Else if total memory > 2 GB

swap size = total memory + 2 GB

According to Red Hat the swap file should never be less than 32 MB. The size also depends on the application, it is normally a good idea to check with the application vendor for recommended swap size.

How to find file that contains a specific word in Linux and Unix.

Andrew Lin — Fri, 24 Apr 2009 02:22:55 +0000

The find and grep command is very handy when searching for files that contains a specific word. Both the find and grep commands are universal in Linux and Unix and the syntax is very similar.

Below is an example.

find /home/andrew -type f -exec grep -H ‘networks’ {} \;

This will display all files in the directory /home/andrew that contains the word networks abd output it to screen.

Here is another example using the grep command alone.

grep -r “networks” /home/andrew

Sendmail-largeboxes.conf displays warning for large mailboxes

Andrew Lin — Mon, 05 Nov 2007 15:12:13 +0000

The sendmail-largeboxes.cof file is used to display warnings for large mailboxes.Â The default configuration is hard coded to consider 40MB+ as large.Â Users will receive email warnings that they have exceeded the 40MB mailbox size.Â You can change the default 40MB to a different value.Â On my Fedora Core 4 installation the file is located in /usr/share/logwatch/default.conf/services/sendmail-largebooxes.conf.Â Â Â The variable to change is $sendmail_largeboxes_size = 40MB.