Retiring, March 2020 - sorry, you have missed our final public course.
The Coronavirus situation has lead us to suspend public training - which was on the cards anyway, with no plans to resume
Please ask about private 'maintenance' training for Python, Tcl, Perl, PHP, Lua, etc
Happily continuing private consultancy / programming work
Checking that all our servers are up and accessible
We run a number of domains (around 50) on different servers (around half a dozen) in various locations in Englnd, Germany and the USA. How can I keep track of them all / do a quick test to chek that - at the least - they're all online to the Internet? And how can I do that test from anywhere I happen to be with a net connection ... even if I'm in a remote location at an Internet cafe or customers's machine?
There's a script on our main web site (and various backup copies on other sites) that uses Expect to "ping" around a domain on each server ... and it then reports the results to the browser. Because expect can support a number of processes in parallel, performance is fast, even if a number of the servers are down.
We're trainers. Love to tell people how we do things. So you can read a bit more about it in our resources centre
, try the script out in our programs directory
and even view the source code
. If you want to learn how to write this sort of thing for yourself, have a look at our Tcl course
P.S. The script actually doubles up ... run on our own network, it provides a quick and easy way to see, at a click, which training systems are on the network and whether we're connected to the Internet at the current time. (written 2005-04-22, updated 2006-06-05)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articlesT212 - Tcl/Tk - Expect Processes 
Expect with Ruby - a training example to get you started - (2016-05-18) 
Checking all the systems on a subnet, using Expect and Tk - (2011-09-18) 
Parallel Pinging, using Python Threads or Expect spawn lists - (2009-11-02) 
Using Tcl and Expect to automate repetitive jobs - (2009-10-24) 
What is running on your network? (tcl and expect) - (2008-09-04) 
Cheat Sheet / Check list for Expect maintainers - (2007-05-02) 
Adding PHP tags to an old cgi program - (2006-04-08)
Some other Articles
Why are we no. 404Object Orientation in Tcl - [incr-Tcl]MP for Devizes, WiltshireColour blindness for web developersChecking that all our servers are up and accessibleAutomating regular manual proceduresWhat career opportunities for web designersThe Iconish languageNatural or man-made?Short weekend
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