The error:
#python installvarnish
File "installvarnish", line 1
SyntaxError: Non-ASCII character '\xf2' in file installvarnish on line 1, but no encoding declared; see http://www.python.org/peps/pep-0263.html for details.
The cause:
This error indicates that a version of python that is not supported or doesn't match your platform is being used.
The fix:
Make sure you download the correct package (el5 or el6) and specify the python binary path explicitly: /usr/bin/python installvarnish