LAMP Tips! » Linux

Smart Relay Configuration in Postfix

Geoff W. — Mon, 26 Jan 2009 23:02:25 +0000

To enable a Smart Relay host in Postfix, simply:

Edit /etc/postfix/main.cf

Search for 'relayhost'

Add your host (with some caveats):

If the Host is an IPAddress:

relayhost = [10.0.0.1]

If the host has a name:

relayhost = domain.tld

If the host runs on an alternative port:

relayhost = [10.0.0.1]:28

or:

relayhost = domain.tld:28

Too many arguments with tar

Geoff W. — Thu, 14 Aug 2008 01:20:36 +0000

Occasionally, when compressing directories with large numbers of files and/or directories contained within them, you will get an error stating: Too many arguments.

This is not an error from the application - rather it is an error from the shell tell you the ARG_MAX limit has been reached. Here is what you can do to avoid/get around that:

If you find that you can not compress a directory because it contains to many files, you can do one of two things:

Compress the container directory or:

Generate the file list
find -iname '*.ext' > file_list.txt

Run tar, passing it the file list
tar czvf archive.tar.gz --files-from file_list.txt

Shorthand of this would be:
find . -name '*.ext' -print | tar -cvzf archive.tar.gz --files-from -

Linking Files

Geoff W. — Fri, 18 Apr 2008 19:07:01 +0000

Create a symlink to a file rather than copying it to a new location

The command is formatted as follows:

ln -s existing_file new_file

You can use this to link directories as well.

ln -s /usr/src /usr/local/src