Cluster Status client / server
I wanted a simple flexable way to view the status of my small cluster (8 nodes + head) without writing a lot of code. Here is my adaptation of the dstat[L1 ] tool to report on an entire cluster.
There are 3 parts. The dstatd server, the modified version of the dstat utility which collects and reports system stat and the cstat client that displays the results to the user.
I have added a couple of options to the dstat program to enhance its use as a slave program.
A daemon to launch dstat processes and report the system status back to clients. One dstat process is launched for each active client. The client requests the dstat options that it would like dstat to be launched with. This is not especially scalable but is very simple and flexable.
The client. It will show the cluster status on an ANSI terminal, write a log or display a Tk strip plot.
Usage
cstat
cstat log
cstat plotThe cstat program requires Tclx and a modified version of A simple slipchart[L5 ]
set options { --color --noupdate -t -c -d -n -M app 5 }
set clients {
piper
mega00
mega01
mega02
mega03
mega04
mega05
mega06
mega07
}
# Tk plotter configuration
#
set colours {
red
green
blue
yellow
cyan
magenta
orange
purple
lightblue
}
set charts {
"User CPU" usr 0 {0.0 100.0 50.0} 1 average
"Sys CPU" sys 1 {0.0 100.0 50.0} 1 average
"Idle CPU" idle 2 {0.0 100.0 50.0} 1 average
"Wait CPU" wait 3 {0.0 100.0 50.0} 1 average
"Disk Read" read 6 {0.0 200.0 100.0} 1048576 sum
"Disk Write" writ 7 {0.0 200.0 100.0} 1048576 sum
"Net In" in 8 {0.0 100.0 50.0} 1048576 sum
"Net Out" out 9 {0.0 100.0 50.0} 1048576 sum
}