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Unix+clones

Xen Disk I/O benchmarking: NetBSD dom0 vs Linux dom0

Post date: April 21, 2005, 10:04 Category: Benchmarks Views: 3019 Comments
Tutorial quote: Xen is a relatively new technology to enable several virtual machines (domU) to run on one computer. The purpose of this article is to determine what operating system (NetBSD or Linux) should be selected as domain 0 (dom0) operating system to get the best performance when running several CPU and disk intensive virtual machines at the same time.
OpenSUSE

ntop in openSUSE to probe & monitor Network Traffic

Post date: April 10, 2009, 07:04 Category: Network Views: 5951 Comments
Tutorial quote: ntop is a free opensource network traffic probe that shows the network usage. ntop is based on libpcap and can run on Linux/Unix and Windows operating system. ntop provides a very easy to use a web access to navigate through ntop traffic information and get a dump of the network status.
Linux

Xen: How to Convert An Image-Based Guest To An LVM-Based Guest

Post date: April 19, 2009, 10:04 Category: Miscellaneous Views: 3158 Comments
Tutorial quote: This short article explains how you can move/convert a Xen guest that uses disk images to LVM volumes. Virtual machines that use disk images are very slow and heavy on disk IO, therefore it is often better to use LVM. Also, LVM-based guests are easier to back up (using LVM snapshots).
NetBSD

How to set up a CARP enabled Firewall

Post date: June 22, 2006, 21:06 Category: Network Views: 6931 Comments
Tutorial quote: CARP is the Common Address Redundancy Protocol. Its primary purpose is to allow multiple hosts on the same network segment to share an IP address. CARP is a secure, free alternative to the Virtual Router Redundancy Protocol and the Hot Standby Router Protocol.
Linux

nBox - Envision your network with nBox (Embedded Ntop)

Post date: May 28, 2007, 22:05 Category: Network Views: 3558 Comments
Tutorial quote: The life of a systems or network administrator requires us to maintain an expansive understanding of our network infrastructure to more effectively manage it. Amidst volumes of complex data that some IT problems present and network management is no exception to these complications. Visual tools allow us to better see trends and make sense of the macro view of our networks. Ntop, nBox, nProbe are just the right FOSS tools that can help us gain greater insight.
XenServer+Express

Virtualization With XenServer 5.5.0

Post date: June 28, 2009, 11:06 Category: Installing Views: 11274 Comments
Tutorial quote: This Howto covers the installation of XenServer 5.5.0 and the creation of virtual machines with the XenCenter administrator console. XenServer is a free virtualization platform from Citrix, the company behind the well known Xen virtualization engine. XenServer makes it easy to create, run and manage Xen virtual machines with the XenCenter administrator console. The XenServer installation CD contains a full Linux distribution which is customized to run XenServer.
Debian

OpenVZ On Debian Etch For Webservers

Post date: December 26, 2006, 21:12 Category: System Views: 3287 Comments
Tutorial quote: Virtualization is a good practice for servers, since it makes things more secure, scalable, replacable, and replicable, all this at the cost of little added complexity. This guide was written during an install of a Supermicro machine with two dual-core opterons (64-bit), two identical disks (for RAID) and a load of memory. Why OpenVZ and not XEN or the recent KVM kernel module? Well, XEN is not very stable for 64-bit architectures (yet), and it comes with quite a bit of overhead (every VM runs its own kernel) due to its complexity. KVM is very simple but restricts you to run a kernel as one process, so the VM cannot benefit from multi core systems.
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: 2996 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

Cutting the tcp/ip network connection with cutter

Post date: December 13, 2005, 03:12 Category: Network Views: 2938 Comments
Tutorial quote: Recently I came across very powerful and nifty tool (used by one of our Sr. network admin). Just imagine that people in your private network using peer to peer software such as Kazaa, iMesh or others and you want to cut them or just want to cut all ftp connection over my firewall but not all traffic to host.
Ubuntu

Screen – Manages multiple sessions on one terminal

Post date: June 15, 2009, 06:06 Category: Software Views: 2481 Comments
Tutorial quote: Screen is a program that allows you to have multiple logins on one terminal. It is useful in situations where you are telnetted into a machine or connected via a dumb terminal and want more than just one login.screen-profiles includes a set of profiles for the GNU screen window manager. These profiles are quite useful on server machines which are not running a graphical desktop.
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