Starting Squid

Use the chkconfig configure Squid to start at boot::

[root@bigboy tmp]# chkconfig squid on

Use the service command to start, stop, and restart Squid after booting:

[root@bigboy tmp]# service squid start

[root@bigboy tmp]# service squid stop

[root@bigboy tmp]# service squid restart

You can test whether the Squid process is running with the pgrep command:

[root@bigboy tmp]# pgrep squid

You should get a response of plain old process ID numbers.

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Webmin is an excellent web-based interface to your Unix based machines. There are no webmin packages in the latest release “Dapper”. This is how I installed webmin on my Dapper server… Install SSH

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This is a Linux command line reference for common operations.
Examples marked with • are valid/safe to paste without modification into a terminal, so
you may want to keep a terminal window open while reading this so you can cut & paste.
All these commands have been tested on Fedora and Ubuntu.

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Introduction

Network security is a primary consideration in any decision to host a website as the threats are becoming more widespread and persistent every day. One means of providing additional protection is to invest in a firewall. Though prices are always falling, in some cases you may be able to create a comparable unit using the Linux iptables package on an existing server for little or no additional expenditure.

This chapter shows how to convert a Linux server into:

• A firewall while simultaneously being your home website’s mail, web and DNS server.
• A router that will use NAT and port forwarding to both protect your home network and have another web server on your home network while sharing the public IP address of your firewall.

Creating an iptables firewall script requires many steps, but with the aid of the sample tutorials, you should be able to complete a configuration relatively quickly.

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