blog.up-link.ro android bsd linux unix & open-source world

12Sep/104

How To Install and Configure Squid as Transparent Proxy Server under Linux and FreeBSD

Squid is a proxy server and web cache daemon. It has a wide variety of uses: caching web, filtering traffic, caching DNS and other computer network lookups for a group of people sharing network resources.

Squid is primarily designed to run on Unix-like systems but it also runs on Windows-based systems. In this tutorial I'll show you how to install and configure squid proxy server to run under Linux and FreeBSD.

A proxy server software is based on the TCP/IP protocol. It monitors a special port such as 3128 or 8080. A computer who runs a proxy server software is called a proxy server. If other computer want to connect to Internet through the proxy server, it should know the proxy server's IP address and proxy port.

Print This Post Print This Post
7Aug/102

How To Install and Integrate eAccelerator into PHP5

eAccelerator is an open source PHP accelerator, optimizer, and dynamic content cache which provides a bytecode cache. eAccelerator increases the performance of PHP scripts by caching them in their compiled state, so that the overhead of compiling is almost completely eliminated. It also optimizes scripts to speed up their execution. eAccelerator typically reduces server load and increases the speed of your PHP code by 1-10 times.

1. Install prerequisites

There is no eAccelerator package in the official repositories, therefore we must compile and install it from the sources. Before we can do this, we need to install some prerequisites.

Print This Post Print This Post
23May/100

How To Update all CentOS/RHEL servers remotely using a shell script

#!/bin/bash
#
# A simply shell script to update remote CentOS/RHEL servers
# You must have ssh public and private key installed. This will save a lot of time if you
# have many servers.
#
# by Adi http://blog.up-link.ro
# May 2010

# an array to store ssh commands for each server
hosts=(
        "ssh root@192.168.1.1 yum update -y"
        "ssh root@192.168.2.1 -p 2222 yum update -y"
        "ssh adi@192.168.3.1 -t sudo  '/usr/bin/yum update -y'"
      )
# read the array and launch the ssh command
for sshcmd in "${hosts[@]}";do $sshcmd;done
Print This Post Print This Post
21May/100

How To Update CentOS Linux 5.4 to CentOS 5.5

CentOS ( Community ENTerprise Operating System ) is a community-supported, mainly free software operating system based on Red Hat Enterprise Linux. It exists to provide a free enterprise class computing platform and strives to maintain 100% binary compatibility with its upstream distribution.

CentOS 5.5 has been released and available via mirrors for immediate update. For more information about this release you can read the release note.

If you have CentOS 5.4 already installed, before to do anything first back up anything you care about.

Print This Post Print This Post
17May/101

How To Install Lighttpd with PHP5 and MySQL support on CentOS 5

Lighttpd is an open-source web server optimized for speed-critical environments. It's standards-compliant, secure and flexible. In this tutorial I'll show you how to install Lighttpd on a CentOS 5.4 server with PHP5 support (through FastCGI) and MySQL support.

1. Installing MySQL 5 Server

To install MySQL run this command from the shell:

# yum install mysql mysql-server

Enable MySQL server on boot and start MySQL server:

# chkconfig --levels 235 mysqld on
# service mysqld start

Print This Post Print This Post
10Apr/103

How To monitor Apache traffic in real-time with apachetop

Apachetop is a very useful program that displays the stats for Apache in real time. Apachetop can show you how many requests per second are coming in, what files have been accessed and how many times. It can also show you who is hitting the sites and where they are coming from.

1. Installing apachetop

To install apachetop in CentOS, Fedora:

# yum install apachetop

Make sure you have DAG repository enabled.

Print This Post Print This Post
2Apr/100

Installing PowerDNS with MySQL backend and PowerAdmin On CentOS

PowerDNS is a MySQL-based DNS server, written in C++ and licensed under the GPL. PowerDNS can be managed through a web interface (PowerAdmin). This guide shows how to install it on CentOS 5.

1. Installing MySQL

# yum -y install mysql mysql-server

2. Enable MySQL on boot and start MySQL server

# chkconfig --levels 235 mysqld on
# service mysqld start

Make sure the MySQL server is running:

# netstat -tap | grep mysql
tcp        0      0 *:mysql                 *:*     LISTEN   28179/mysqld

3. Set password for user root

# mysqladmin -u root password your_password

Print This Post Print This Post