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Execute commands simultaneously on multiple servers Using PSSH/Cluster SSH/Multixterm -- Ubuntu Geek

If you have multiple servers with similar or identical configurations (such as nodes in a cluster), it’s often difficult to make sure the contents and configuration of those servers are identical. It’s even more difficult when you need to make configuration modifications from the command line, knowing you’ll have to execute the exact same command on a large number of systems . In this tutorial we will see some tools to execute one command on multiple remote servers using ssh.First you need to make sure you have ssh installed in your machine or you can install using the following command

Xen Backup Image — Rogerio Ferreira

# Performing remote backups of VMs created with xen-create-image tool (xen-tools). # Use rdiff-backup as backend.

Yuuguu - The free remote desktop and screen sharing tool

by 7 others
En plus de pouvoir partager votre écran avec un groupe d’un maximum de 30 personnes, vous pourrez maintenant utiliser Yuuguu pour communiquer avec vos contacts par messagerie Internet. Messagerie unifiée et partage d’écran sur une même application, c’est ce que vous propose Yuuguu. En plus de clavarder avec vos contacts Yuuguu, vous pourrez aussi ajouter vos profils Yahoo Messenger, MSN, AIM, ICQ et Google Talk. Yuuguu s’installe rapidement, en terme de ressource, la version Mac requiert environ 130Mb de mémoire vive. Le partage d’écran ne semble pas affecter les ressources requises par cette application. En comparaison, Adium demande 35 Mb et Skype 43 Mb. yuuguu Le service de partage d’écran Yuuguu ajoute la messagerie Internet multiprotocole Lorsque vous organisez une réunion, seul l’hôte de la conférence doit posséder Yuuguu sur son poste de travail. Les participants accèdent à la présentation depuis un lien URL unique généré par Yuuguu. C’est l’un des services de partage d’écran des plus faciles à utiliser. De plus, comme les participants n’ont rien à installer pour participer à une conférence, Yuuguu peut être utilisé même dans un environnement sécurisé. Yuuguu est gratuit et disponible en version Windows, Mac et Linux. :: Parallel SSH execution and a single shell to control them all

Many people use SSH to log in to remote machines, copy files around, and perform general system administration. If you want to increase your productivity with SSH, you can try a tool that lets you run commands on more than one remote machine at the same time. Parallel ssh, Cluster SSH, and ClusterIt let you specify commands in a single terminal window and send them to a collection of remote machines where they can be executed. Why you would need a utility like this when, using openSSH, you can create a file containing your commands and use a bash for loop to run it on a list of remote hosts, one at a time? One advantage of a parallel SSH utility is that commands can be run on several hosts at the same time. For a short-running task this might not matter much, but if a task needs an hour to complete and you need to run it on 20 hosts, parallel execution beats serial by a mile. Also, if you want to interactively edit the same file on multiple machines, it might be quicker to use a parallel SSH utility and edit the file on all nodes with vi rather than concoct a script to do the same edit. Many of these parallel SSH tools include support for copying to many hosts at once (a parallel version of scp) or using rsync on a collection of hosts at once. Because the parallel SSH implementations know about all the hosts in a group, some of them also offer the ability to execute a command "on one host" and will work out which host to pick using load balancing. Finally, some parallel SSH projects let you use barriers so that you can execute a collection of commands and explicitly have each node in the group wait until all the nodes have completed a stage before moving on to the next stage of processing.

Xen Backup Script - Wiki

If you're using LVM based storage for your domains this script will create a snapshot and backup each server to a local drive or a remote system using rdiff-backup.


Nimbus provides a free, open source infrastructure for remote deployment and management of virtual machines, allowing you to: * Create compute clouds (make your own EC2 style service). For examples, see the science clouds page. * Deploy "one-click" auto-configuring virtual clusters (see the cloud clusters page). They adapt on the fly into new network and security contexts so you can set them up once and run them over and over again, even across different clouds. * Serve clients that are compatible with the Amazon EC2 service, see What is the EC2 frontend? * Integrate VMs on a set of resources already configured to manage jobs (i.e., already using a batch scheduler like PBS). See What is the Workspace Pilot? * Interface to Amazon EC2 resources, see What is the EC2 backend? * Easily experiment with new remote protocols and backends, see What is the RM API?

Zivios - Opensource Enterprise Management

by 1 other
Zivios is a web based control panel which brings together vital open source technologies needed by medium and large enterprises. At it's core, Zivios provides identity management, single sign-on, user, group and computer provisioning, as well as remote management of services. Zivios offers an easy and extensible API, allowing organizations to extend the core application with additional plugins for their in-house or third party software.

Installing Zivios Server On Ubuntu | HowtoForge - Linux Howtos and Tutorials

This howto explains installing Zivios Master Service version 0.5.0. Zivios is an n-tiered PHP-5 application, providing identity management, single sign-on, user, group and computer provisioning, as well as remote management of services. It uses MySQL and OpenLDAP as it's data store, with OpenLdap being the primary back end for identity management and application integration and MySQL being used for panel specific data.


by 7 others
rsnapshot is a filesystem snapshot utility for making backups of local and remote systems. Using rsync and hard links, it is possible to keep multiple, full backups instantly available. The disk space required is just a little more than the space of one full backup, plus incrementals. Depending on your configuration, it is quite possible to set up in just a few minutes. Files can be restored by the users who own them, without the root user getting involved. There are no tapes to change, so once it's set up, your backups can happen automatically untouched by human hands. And because rsnapshot only keeps a fixed (but configurable) number of snapshots, the amount of disk space used will not continuously grow.

Open-Source Classroom Management With iTALC On Ubuntu 7.10 | HowtoForge - Linux Howtos and Tutorials

This document describes how to set up iTALC on Ubuntu 7.10. iTALC is an open-source classroom management solution that lets you view and control other computers in your network. It lets you remote-control other computers, show the teacher's screen on all students' computers, lock workstations, send text-messages to students, power on/off and reboot remote computers, etc.

SSH dynamic port forwarding with SOCKS

SSH has numerous uses beyond just logging into a remote system. In particular, SSH allows you to forward ports from one machine to another, tunnelling traffic through the secure SSH connection. This provides a convenient means of accessing a service hosted behind a firewall, or one blocked by an outgoing firewall. However, forwarding an individual port still requires you to change where your program connects, telling it to use a non-standard port on localhost rather than the standard port on the remote machine, and it requires a separate port forward for each machine you want to access. Dynamic port forwarding via SOCKS provides a more convenient alternative. The examples in this article assume that you reside behind a restrictive firewall which does not allow outgoing SMTP connections except to a designated mail server. You want to connect to a different mail server,, on port 25. You have an SSH account on a machine, which does not reside within the restrictive firewall and can thus access port 25 on

Amy Editor - A Collaborative Text and Source Code Editor for Developers

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Core features * Works in your browser (*) * Support for any programming language (**) * Unlimited number of views for one document * Smart code snippets * Full internationalization * Real-time document collaboration * Programmable bundles with Editor * Various color themes * Remote commands, text manipulation * Supports opening documents via FTP, WebDAV, local computer, customized projects and various blog APIs * Easily embeddable to your own page * Host computer clipboard integration (*) Amy can be comfortably run on Safari and Gecko-based browsers (Firefox, Camino, Seamonkey,...) on any OS. It's runnable on Internet Explorer 6,7 and Opera 9 , but it's not officially supported and user experience may not be pleasant. (**) Languages are supported through bundles. It's very easy to add support for your favorite language (and/or dialects). Currently implemented are C, C , C#, JavaScript, Ruby (on Rails), PHP, Java, Texy and HTML. Text editing features * Syntax highlighting * Smart indentation for each language * Code folding * Bookmarks * Word completion * Insert/Overwrite mode * Unlimited undo/redo * Intelligent character pairing * Customizable key shortcuts (*)


spamdyke: A drop-in connection-time spam filter for qmail

spamdyke is a filter for monitoring and intercepting SMTP connections between a remote host and a qmail server. Spam is blocked while the remote server (spammer) is still connected; no additional processing or storage is needed.

Backup Ubuntu using rdiff-backup -- Ubuntu Geek

rdiff-backup backs up one directory to another, possibly over a network. The target directory ends up a copy of the source directory, but extra reverse diffs are stored in a special subdirectory of that target directory, so you can still recover files lost some time ago. The idea is to combine the best features of a mirror and an incremental backup. rdiff-backup also preserves subdirectories, hard links, dev files, permissions, uid/gid ownership, modification times, extended attributes, acls, and resource forks. Also, rdiff-backup can operate in a bandwidth efficient manner over a pipe, like rsync. Thus you can use rdiff-backup and ssh to securely back a hard drive up to a remote location, and only the differences will be transmitted. Finally, rdiff-backup is easy to use and settings have sensical defaults.

Running Windows as a VM on Linux with VMware Server

by 1 other
What if there was a way to publish an application on the Linux desktop via a remote connection protocol like Remote Desktop Protocol? I know that this sounds an awful lot like Citrix and, in fact, what I am proposing is similar. However, Citrix is expensive and seems to be overkill for just a few network/security administrators' laptops or desktops. This recipe consists of a laptop/desktop running Linux in a GUI with VMware Server, a Windows XP VM and a product called 2X Application Server for Windows Terminal Services. Once you are done, you will have a Windows XP VM running as a service and loaded with any applications that you may need.


Securely Administring Remote Machines Using Freenx in Ubuntu -- Debian Admin

FreeNX is a system that allows you to access your desktop from another machine over the internet. You can use this to login graphically to your desktop from a remote location. One example of its use would be to have a FreeNX server set up on your home computer, and graphically logging in to the home computer from your work computer, using a FreeNX client.

HOWTO Access A Superfast Linux Desktop From Anywhere Using FreeNX | Biohackery

by 4 others
FreeNX allows superfast and secure access to your Linux box from anywhere in the world.

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