How to deface the whole server

There are two type of server
1-shared server
2-independent server
in shared server there are lot of website
running on that server .that's why hacking all
websites is easier.
for mass deface firstly we can find the vuln
website(sqli, rfi,lfi)
after that you can upload your shell
(c99 ,r57)
then if it is Linux server then you can
symlink the server or rooted the server by
using net cat
if it is windows server then you can use
metasploit
for that you can create vuln file and
executed by the shell.after that you got
meterpreter and by using that you have fully
access on all websites for deface