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Installation And Setup Guide For DRBD, OpenAIS, Pacemaker + Xen On OpenSUSE 11.1
The following will install and configure DRBD, OpenAIS, Pacemaker and Xen on OpenSUSE 11.1 to provide highly-available virtual machines. This setup does not utilize Xen's live migration capabilities. Instead, VMs will be started on the secondary node as soon as failure of the primary is detected. Xen virtual disk images are replicated between nodes using DRBD and all services on the cluster will be managed by OpenAIS and Pacemaker. The following setup utilizes DRBD 8.3.2 and Pacemaker 1.0.4. It is important to note that DRBD 8.3.2 has come a long way since previous versions in terms of compatibility with Pacemaker. In particular, a new DRBD OCF resource agent script and new DRBD-level resource fencing features. This configuration will not work with older releases of DRBD.
Registering Local Or Remote Commands With logsave
The general idea is to use the logsave to register commands and their outputs. Initially we record local commands and then we use this technique to make a record (locally) about a remote session.
This tutorial is going to speak about vim basic use. Vim is a powerful text editor used in CLI (command line interface). Because linux uses a lot of configuration files, you'll often need to edit them and vim is a great tool to do so.
How To Defend slowloris DDoS With mod_qos (Apache2 On Debian [Lenny])
mod_qos gives some fine-grained opportunities to scale the number of used connections and to defend an attack according to bandwidth limits. Unfortunately it is only available as source-package and there are many possible settings, wich might be hard to setup for this special case. So I provide the way that helped me.
How To Remotely Shut Down Windows XP Computers From A Linux Server
As a budget cutback, our school administrators asked us to shutdown all non-essential classroom computers at night to save electricity. I teach Linux in a classroom that has a Dell Poweredge 2850 Red Hat Enterprise Linux (RHEL5) server and 29 Dell Optiplex 745 student lab computers running Microsoft Windows XP SP3 as the host operating system and VMWare Server to provide virtual Linux machines for our classes. I researched on the Internet for the best solution to remotely shutdown the student lab computers at night. I was not able to find one post or how-to that completely answered my questions, but I was able to piece together a solution. In an effort to document this project and help others with similar needs, here are my notes on the project.
How To Configure SSH Keys Authentication With PuTTY And Linux Server In 5 Quick Steps
This tutorial explains how you can replace password-based SSH authentication with key-based authentication which is more secure because only the people that own the key can log in. In this example, we're using PuTTY as our SSH client on a Windows system.
Creating Portable DiskSafes With LoopbackFS And LVM Snapshots
This is the "DiskSafe" idea used to store backups of server data. This could be used to replace physical tape volume and still provide portablility. I have found pieces of this information around the Internet but nothing putting it all together.
Record "DreamBox dm 500 S" On Linux Over HTTP Stream
This "short HowTo" shows how to watch, record and convert TV shows on-the-fly from "DreamBox" using the "HTTP" streaming service on a PC runing Linux OS. The "DreamBox" is a satellite receiver that has a NIC and you can access it using a web interface to watch and control it.
Management Of Backups With DAT Devices
I had the chance to use a DAT device (an old HP SuperStore DAT24) to make copy on tapes. I didn't want to install any new software to manage that task. This guide can be considered a first step to know how the thing can work. Then, everybody can customize it according to the personal needs.
Adding Date And Time To Your Bash History
This is a quick but handy addon (RedHat/CentOS) to enhance your bash history (bash > 3.0). It comes in handy particularly if there are multiple people maintaining a given server (so you can see when a command was performed) or even if you are the sole maintainer, but can't remember exactly when you did or changed something.
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