The sys admin’s daily grind: Cluster SSH

Spontaneously Simultaneous

Article from Issue 123/2011
Author(s):

Charly doesn’t relish the idea of searching through the logfiles of a dozen proxy servers when page requests fail. Now that he has deployed Cluster SSH, he can pull the strings on many machines at the same time.

To load balance and improve availability, you first need to organize your servers in a cluster. To remove the element of surprise from cluster management, all of the member servers should be identical – which makes the cluster easy to manage but also makes the task really boring. Cluster SSH [1], which saves you a load of work with very little overhead, has a minimalist Tk interface with a text input box. Commands you type in the box are run on all connected servers (Figure 1).

Buy this article as PDF

Express-Checkout as PDF
Price $2.95
(incl. VAT)

Buy Linux Magazine

SINGLE ISSUES
 
SUBSCRIPTIONS
 
TABLET & SMARTPHONE APPS
Get it on Google Play

US / Canada

Get it on Google Play

UK / Australia

Related content

  • Charly's Column

    Parallel SSH is the name of an easy-to-configure tool that our resident sys admin, Charly, now routinely deploys whenever he needs to launch the same programs, copy the same files, or kill the same processes simultaneously on multiple computers.

  • Charly's Column: Terminator

    Friends are all about friendship – names and appearances typically don’t play any role at all. Sys admin Charly’s friend the Terminator is a convincing example.

  • Charly's Column: Corkscrew

    Sys admin columnist Charly never takes a vacation from the Internet. A beach bar with WiFi is quickly found, but it runs a forced proxy, which thinks that the SSH port (22) is in league with the devil and blocks the connection. Time to drill a tunnel.

  • Charly's Column

    Users log on to services such as SSH, ftp, SASL, POP3, IMAP, Apache htaccess, and many more using their names and passwords. These popular access mechanisms are a potential target for brute-force attacks. An attentive bouncer will keep dictionary attacks at bay.

  • Charly's Column

    Leafnode is a Usenet server for small sites where just a few users need access to a large number of groups. The Leafnode server is designed to recover from errors autonomously and needs very little attention.

comments powered by Disqus
Subscribe to our Linux Newsletters
Find Linux and Open Source Jobs
Subscribe to our ADMIN Newsletters

Support Our Work

Linux Magazine content is made possible with support from readers like you. Please consider contributing when you’ve found an article to be beneficial.

Learn More

News