11 Best Articles for you -LinuxReaders.

Dhaval Thakar — Sat, 02 Jan 2010 13:08:33 +0000

Here I am sharing 10 best articles on LinuxReaders.com during year 2009.

These are not just popular viewed articles but are the best of my selection. These are useful for any linux admin to ease routine tasks.

1) Change Ubuntu 9.10 Resolution
By default Ubuntu 9.10 supports 1024×768 resolution, which is not enough for me. I needed to increase it to 1240×1024. To achive my desired resolution I run through few commands. Its easy, take a look.

2) Root login on Ubuntu 9.10
As I have already expressed my love with root access in previous post, this time I was looking for a way to use root login for GUI. One of my colleague who loves Ubuntu found simple way to login root over GUI

3) NConf Installation & Configuration
NConf is a PHP based web-tool for configuring the Nagios monitoring software. The tool is based on PHP / MySQL.

4) Root login on Fedora 12
Root Login on Fedora is not as easy as Ubuntu Root Login, here you need to modify two files to get root access.

5) Play MP3 files on Ubuntu 9.10
After installing 9.10 didn’t play mp3 files.
Whenever I tried playing mp3 files using Totem Movie Player did not played mp3 files. Although it tried searching for plugin but no plugin was found.

6) Squid Proxy
Squid is a caching proxy server.
Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. It reduces bandwidth and improves response times by caching and reusing frequently-requested web pages. Squid has extensive access controls and makes a great server accelerator. It runs on most available operating systems, including Windows and is licensed under the GNU GPL.

7) Virtualization using Xenserver
I have implemented Xenserver for Virtualization. I feel this is better than community version of VMware Server & equipped with more features.

Openfire Messenger Server
For any organization it is necessary to have fastest & economical way to communicate.
Consider you have few hundred branches spread all over the country, will this be viable solution to communicate over telephone lines?

9) Ubuntu- Sudo without password
I am Linux Admin, my routine job is to maintain proxy, nagios & mail server. I always use root user for my servers. Thus I am used to full rights.

10) Upgrade Fedora 11 to 12 -using shell
Earlier we have covered upgrading Ubuntu to the latest version. There only one command required for the upgradation. Here procedure is bit lengthy.

11) Nagios Installation
In current world everything is available online, every organization is trying to reduce their downtime. Almost all Data Centers are running hundreds of services. It is not possible for human being to monitor all services, this is where Nagios is useful. Administrator can use Nagios to monitor all hosts, services, network devices.

11 Best Articles for you -LinuxReaders. is a post from: LinuxReaders

Squid Proxy

Dhaval Thakar — Sun, 29 Mar 2009 23:27:00 +0000

Squid is a caching proxy server.
Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. It reduces bandwidth and improves response times by caching and reusing frequently-requested web pages. Squid has extensive access controls and makes a great server accelerator. It runs on most available operating systems, including Windows and is licensed under the GNU GPL.
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Squid is available with major linux distributions like CentOS, Fedora.

To install Squid

yum install squid

To configure Squid.

vi /etc/squid/squid.conf
visible_hostname test.squid

Restart Squid Service

service squid restart

Use your local squid proxy server ip address & port 3128 (squid default port) to configure in internet clients. While accessing internet you’ll get error Access Denied.

To allow internet access to your local lan.

vi /etc/squid/squid.conf
acl myuser src 192.168.1.0/255.255.255.0
http_access allow myuser

To allow all internet sites, blocking few e.g jobs, community.

acl myuser src 192.168.1.0/255.255.255.0
acl deniedsites url_regex “/etc/squid/denied” #list of the sites blocked
http_access deny myuser deniedsites #to block ban sites
http_access allow myuser

To disabled caching for specific sites, you might require to disable caching for few sites e.g intranet site.

acl MYSITES url_regex “/etc/squid/nocache”
no_cache deny MYSITES

Squid with ARP instead ip address.
You may be using DHCP with minimum lease time, in this case you require to filter sites using MAC ADD instead of ip address.

You need to compile Squid from source with –enable-arp-acl (use squid -v & add all existing configuration option.)

acl yahoomailuser arp “/etc/squid/yahoomailuser” #list of the user’s mac add
acl yahoomail url_regex “/etc/squid/yahoomail” #url allowed
http_access allow yahoomailuser yahoomail

Transparent proxy.

vi /etc/squid/squid.con
http_port 192.168.1.1:3128 transparent # squid local ip address
OR
http_port 3128 transparent

Transparent proxy is used when you do not wish to define proxy settings in clients terminal, for that you need to do port redirection using iptables over gateway.

iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3128

Squid with Clamav scanner.

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11 Best Articles for you -LinuxReaders.

Squid Proxy