Usually a firewall is used to protect a server from other servers and networks. However, in some cases you may also want to protect a server within a network by using a TCP Wrapper.

The Xinetd super server that comes with most Linux distributions includes a built-in TCP wrapper. It can be used to explicitly define network services to accept incoming connections from specified servers and networks.
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The script found on the following site http://bashcurescancer.com

The a script is called monitorCpuUsage.sh. It is meant to be called from crontab and to inform you of processes or users who maybe using excessive amounts of cpu.
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There are several ways to do this and the best way is to install a utility called “lsof” which you can find in /usr/ports/sysutils/lsof. Once you install this you will type:
# lsof -i
This will list out all the ports / ips / hostnames that are listening on your server. Another way would be to use the “netstat” command by typing:
# netstat --listen

To change the port, select the “my.cnf file.

Change it to whatever you like and remove the # from the front. Then restart the engine and you should be set for that.

Open /etc/my.cnf file:

# vi /etc/my.cnf

Set new port 5123:
port=5123
Here is is my sample /etc/my.cnf file:

[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
port=5123
old_passwords=1
bind = 203.171.31.11

The find utility on linux allows you to pass in a bunch of interesting arguments, including one to execute another command on each file. We’ll use this in order to figure out what files are older than a certain number of days, and then use the rm command to delete them.
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