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Setting up squid proxy server on Ubuntu (Quick Start Guide)

Post date: October 10, 2010, 05:10 Category: Software Views: 4912 Comments
Tutorial quote: Squid is an internet proxy server that can be used within a network to distribute an internet connection to all the computers within the network. One central computer is connected to the internet through any means such as dial-up, cable modem, ISDN, DSL, or T1, runs squid, and thus acts as the firewall to the internet. Because it is a proxy, it has the capabilities to log all user actions such as the URLs visited. There are many features that can be configured in squid. This guide is meant to be a quick start guide for those who are eager to get squid working and then configure it from there.

VMware Server 2.0.2-x On Ubuntu Server 10.04 With VMware Remote Console Plug-in

Post date: August 24, 2010, 16:08 Category: Installing Views: 4575 Comments
Tutorial quote: Today I will tell you how to set up a new Ubuntu 10.04 server which runs VMware server 2.0.2-x and the VMware Remote Console Plug-in. With VMware Server you can create and run guest operating systems ("virtual machines") such as Linux, Windows, FreeBSD, etc. under a host operating system. This has the benefit that you can run multiple operating systems on the same hardware which saves a lot of money, and you can move virtual machines from one VMware Server to the next one (or to a system that has the VMware Player which is also free).

Building a Linux virtual server

Post date: June 9, 2005, 14:06 Category: Software Views: 3437 Comments
Tutorial quote: With the explosive growth of the Internet, the workload on servers providing Web, email, and media services has increased greatly. More and more sites are being challenged to keep up with the growing demands and are employing several techniques to avoid overloading their servers. Building a scalable server on a cluster of computers is one of the solutions that is being effectively put to use. With such a cluster, the increasing requests can be easily managed by simply adding one or more new servers to the existing cluster as required. In this article we will look at setting up one such scalable, network load-balancing server cluster using a virtual server via the Linux Virtual Server Project.

How to get ath5k working on Jaunty with Compat-wireless and a self-compiled kernel

Post date: May 27, 2009, 07:05 Category: Software Views: 3775 Comments
Tutorial quote: I used to have some trouble while setting up my Atheros PCI card on Ubuntu Linux 9.04. It worked natively on Ubuntu 8.04, where it was detected as ath0. I upgraded from 8.04 to 8.10 whereby I noticed my wireless PCI card didn’t work natively anymore. Someone suggested me to upgrade from 8.10 to 9.04 Jaunty, and I did that immediately. After the system upgrade I noticed again that my wireless device was gone in Ubuntu 9.04. When I ran iwconfig I didn’t see wlan0 or ath0 anymore.


How To Install VMware Server On Ubuntu 7.04 (Feisty Fawn)

Post date: April 30, 2007, 23:04 Category: Installing Views: 3588 Comments
Tutorial quote: This tutorial shows how to install the free VMware Server on an Ubuntu 7.04 (Feisty Fawn) system. With VMware Server you can create and run guest operating systems (virtual machines) such as Linux, Windows, FreeBSD, etc. under a host operating system. This has the benefit that you can run multiple operating systems on the same hardware which saves a lot of money, and you can move virtual machines from one VMware Server to the next one (or to a system that has the VMware Player which is also free).

The 'no-configuration, only-active-when-needed' SSH VPN

Post date: April 13, 2005, 03:04 Category: Network Views: 3192 Comments
Tutorial quote: So, we started thinking about how we might set up a VPN between the application server and our internal software mirror. The only requirement is that the VPN be initiated from the "inside-out" and that the connection is only active for as long as we need to use. In other words, it would only be active during an administration session. Ideally, it wouldn't be a lot of work to setup and tear down either.

SSH to the rescue...

Fortunately, SSH client and server come with support for this out of the box, requiring no additional software to be installed, and no configuration changes. On the server side, sshd, the setting "AllowTcpForwarding" defaults to "yes" unless your sshd_config file explicitly disables it. On the client side, all you have to do is request the forwarding.

Restricting Users To SFTP Plus Setting Up Chrooted SSH/SFTP (Debian Squeeze)

Post date: September 6, 2011, 07:09 Category: Miscellaneous Views: 6239 Comments
Tutorial quote: This tutorial describes how to give users chrooted SSH and/or chrooted SFTP access on Debian Squeeze. With this setup, you can give your users shell access without having to fear that they can see your whole system. Your users will be jailed in a specific directory which they will not be able to break out of. I will also show how to restrict users to SFTP so that they cannot use SSH (this part is independent from the chroot part of this tutorial).

Secure Your Apache With mod_security

Post date: July 16, 2006, 16:07 Category: Security Views: 5636 Comments
Tutorial quote: This article shows how to install and configure mod_security. mod_security is an Apache module (for Apache 1 and 2) that provides intrusion detection and prevention for web applications. It aims at shielding web applications from known and unknown attacks, such as SQL injection attacks, cross-site scripting, path traversal attacks, etc.

In the first chapter I will show how to install mod_security on Debian Sarge, Ubuntu 6.06 LTS (Dapper Drake), and on Fedora Core 5, and in the second chapter I will describe how to configure Apache for mod_security which is independent from the distribution you're using.

I want to say first that this is not the only way of setting up such a system. There are many ways of achieving this goal but this is the way I take. I do not issue any guarantee that this will work for you!

Setting up yum on SUSE LINUX 10.0

Post date: October 16, 2005, 16:10 Category: System Views: 6004 Comments
Tutorial quote: Why should I use yum and not yast? Well, yast is nice, but has some disadvantages: It can#t check for gpg keys, you have to trust the mirrors you add. And, speaking about mirrors, yast has no real mirror management for one source. Especially in these times the most and best known SUSE mirrors are very slow or just closed down, so you have to add other sources in yast. But yast needs your clicks when a mirror is not reachable, and if you enter several sources just as mirrors, it checks every single source - that takes quite a long time!
A last reason (which is not important know because SUSE LINUX has a ugly workaround) is that yast is not able to handle packages for different architectures - it can only install packages for one architecture.

Setting Up A High-Availability Load Balancer With HAProxy/Heartbeat On Fedora 8

Post date: March 2, 2008, 12:03 Category: Installing Views: 4685 Comments
Tutorial quote: This document describes how to set up a two-node load balancer in an active/passive configuration with HAProxy and heartbeat on Fedora 8. The load balancer acts between the user and two (or more) Apache web servers that hold the same content. The load balancer passes the requests to the web servers and it also checks their health. If one of them is down, all requests will automatically be redirected to the remaining web server(s). In addition to that, the two load balancer nodes monitor each other using heartbeat. If the master fails, the slave becomes the master - users will not notice any disruption of the service. HAProxy is session-aware - you can use it with any web application that makes use of sessions like forums, shopping carts, etc.
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