watch-multiple-mimdefangs.tcl is a Tk script that graphically
displays the status of mimedefang-multiplexor(8) on a cluster of
machines. Note that Tcl/Tk 8.4 or higher is required to run
If you supply the -archive command-line option, then
watch-multiple-mimdefangs.tcl logs the output of
md-mx-ctrl rawload for each machine. The output for machine_name is logged in:
To use watch-multiple-mimdefangs.tcl to monitor a cluster of machines,
you need the following prerequisites:
A UNIX-like machine with Tcl/Tk 8.4, the X window system and an SSH client.
You also need "xterm" to use some of the features.
The ability to SSH as root to all of the machines you want to monitor.
Ideally, you should be using the SSH agent so that you can SSH to the
monitored machines as root without being prompted for a password or
The program md-mx-ctrl on root's path on all the machines you want
For each machine specified on the command line, watch-multiple-mimdefangs.tcl creates a chart with five columns. The columns are:
A button with the name of the machine. Clicking the button pops up
a menu that lets you take various actions, as described later. If all slaves
on the machine are busy, the button turns yellow.
A label showing the number of busy slaves in the form "busy/total", where
total is the total number of slaves.
A label showing the average number of messages per second over the last
A label showing the average number of milliseconds per scan over the
last 10 seconds.
A chart that graphs the average number of busy slaves, the average
number of messages per second and the average scan time in milliseconds,
all averaged over the last 10 seconds.
If you click on a machine name, a menu with three options pops up:
Open an xterm session and ssh as root to the machine.
Monitor the busy slaves on the machine. If you click on the
process-ID of a slave, an xterm will open up and the command "strace
-s 100 -t -p pid" will be executed on the remote machine. This
is Linux-specific, but you can edit
watch-multiple-mimdefangs.tcl to replace the command with your
particular system's command for tracing system calls.
Remove the machine from the list of machines being monitored.
ADDING A MACHINE
If you need to add a machine to the display, simply type the name of the
machine in the "Add Machine:" box and press Enter.
watch-multiple-mimdefangs.tcl was written by David F. Skoll.