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Debian

Setting Up A Mail Server Using Exim4, Clamav, Dovecot, SpamAssassin On Debian

Post date: September 23, 2010, 11:09 Category: Installing Views: 3587 Comments
Tutorial quote: This howto describes one way to build a scalable, secure, full-featured mail platform. It offers virtual hosting of mailboxes in maildir format with support for quotas and server-side filtering, domain aliasing, address aliasing, address forwarding, catchall addresses. Relaying is secured with STARTTLS and SMTP-AUTH. Incoming mails are checked for viruses, spam, and checked against SPF policy and DNSBL.
Unix+clones

Have a Bash With This Linux Shell

Post date: April 15, 2005, 05:04 Category: Programming Views: 3968 Comments
Tutorial quote: Any Linux administrator who wishes to remain sane relies heavily on scripting to automate routine tasks, customize jobs, and build the plumbing that connects the different utilities that make a Linux system run smoothly. The Linux world is chock-full of scripting languages: Perl, Python, PHP, Scheme, Tcl, Tk, Ruby, Forth, Smalltalk, Eiffel, and doubtless many more. To get the column started, we'll look at shell scripting with Bash, and scripting with Python and Perl.
Ubuntu

Installing Xen 3.3 With Kernel 2.6.27 On Ubuntu 8.10 (x86_64)

Post date: February 24, 2009, 12:02 Category: Installing Views: 3753 Comments
Tutorial quote: This tutorial shows how you can install Xen 3.3 on an Ubuntu 8.10 host (dom0). Xen 3.3 is available from the Ubuntu 8.10 repositories, but the Ubuntu 8.10 kernels (2.6.27-x) are domU kernels, i.e., they work for Xen guests (domU), but not for the host (dom0). Therefore we need to build our own dom0 kernel. This guide explains how to do this with a 2.6.27 kernel.
Ubuntu

Creating Virtual Machines With vmbuilder On Ubuntu 8.10

Post date: December 16, 2008, 12:12 Category: Miscellaneous Views: 4490 Comments
Tutorial quote: vmbuilder is a tool (introduced on Ubuntu 8.10) that allows you to build virtual machines (with Ubuntu as the OS) for multiple virtualization techniques. Currently it supports Xen, KVM, VMware Workstation 6, and VMware Server. You can afterwards copy the virtual machines to another system (a Xen, KVM, VMware Workstation 6, or VMware Server host) and run them there.
Linux

Building an LDAP Server on Linux, Part 1

Post date: April 15, 2005, 17:04 Category: Network Views: 3218 Comments
Tutorial quote: Your network is growing in size and complexity. It's taking on a life of its own, spreading and growing and absorbing everything in its path. You're tearing your hair out trying to keep track, and your users have somehow discovered your secret phone number and are pestering you with endless questions and demands--where do I find this; I don't want to keep track of a dozen different passwords; nothing works like it should.

Of several possible solutions, consider two: 1) find a new hiding place, or 2) implement an LDAP server. While finding a new hiding place might sound ideal, it's an option we're going to have to save for a future article. This series will instead explain what LDAP is good for, detail how to build an LDAP server, and cover what you can do with it.
Ubuntu

Load-Balanced High-Availability Web Cluster With 2 Xen Servers On Ubuntu 8.04

Post date: October 12, 2008, 12:10 Category: Installing Views: 3560 Comments
Tutorial quote: In this howto we will build a load-balanced and high-availability web cluster on 2 real servers with Xen, hearbeat and ldirectord. The cluster will do http, mail, DNS, MySQL database and will be completely monitored. This is currently used on a production server with a couple of websites. The goal of this tutorial is to achieve load balancing & high availability with as few real servers as possible and of course, with open-source software. More servers means more hardware & hosting cost.
Linux

Flexnet License Monitoring With rrdtool

Post date: July 15, 2010, 11:07 Category: Miscellaneous Views: 6753 Comments
Tutorial quote: Some of you may know the commercial Flexnet Licencing Application (İMacrovision). It's a client-server based solution for managing the usage of socalled Flexnet-enabled applications. You can hold licenses of more than one product on one license-server. As you typically have to buy licenses and licenses can be expensive it would be nice to have a monitoring solution to see the utilization of the precious licenses, whether they are underutilized (so money is wasted) or are always fully utilized (so that you can suspect that sometimes people cannot do their work, or only delayed) which is also a waste of resources. As far as I know there are commercial applications for performing such reports, but again you have to spend money. Why not build a simple system yourself, which shows the actual and past usage in an "MRTG style"?
Openfiler

Openfiler 2.3 Active/Passive Cluster With Offsite Replication Node

Post date: February 10, 2011, 14:02 Category: Installing Views: 5313 Comments
Tutorial quote: Openfiler is a Linux based NAS/SAN application which can deliver storage over nfs/smb/iscsi and ftp. It has a web interface over that you can control these services. The cluster we build will consist of two nodes replicating each other and taking over services and storage in case of emergency. Furthermore we have an Offsite Replication Server, which ideally stands in a physically different position and replicates the configurations/storage from which ever node is active. In case of emergency this Offsite Replication Server can be used to restore the cluster and to deliver the services.
Linux

Building a Virtual Cluster with Xen

Post date: September 28, 2006, 04:09 Category: Emulation Views: 8551 Comments
Tutorial quote: It is a common practice to have development and test servers for each production server, so that you can experiment with changes without the fear of breaking anything important, but this is usually not feasible with clusters. So how do you try that new version of your favorite program before committing it to the production cluster? A cheap and convenient possibility is to build a virtual cluster.

Thanks to the Xen virtual machine monitor, you can create a number of virtual machines, all running simultaneously in your computer, install different operating systems in them, or just different configurations, and connect them via (virtual) network cards. Xen is a terrific tool for building virtual Beowulf clusters. It can prove useful when learning or teaching about clusters or for testing new features/software without the fear of causing major damage to an existing cluster.
Gentoo

Build your own Gentoo rescue LiveCD and USBStick

Post date: June 20, 2005, 04:06 Category: Miscellaneous Views: 5700 Comments
Tutorial quote: I've written this how-to after trying to find a boot medium for my home gateway machine which could be used for system rescues and even installing Gentoo. Why not use the standard Gentoo Live CD you ask? Well my gateway machine is one of those small, silent and cool running mini-itx machines (http://www.mini-itx.com) and has no CDROM or floppy drive. I needed some way of getting Gentoo on there and some way of easily rescuing it when the need arises. The good news is that these VIA mini-tix machines are USB bootable and I much preferred the idea of having a little USB drive/stick that I could push into any USB bootable machine and boot into Linux rather than having to set up a PXE networked boot environment (which is also supported).
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