The IEPM-BW system is controlled by various daemons which are started/restarted by various cron jobs. In addition there are 'servers', and cleanup scripts which are also started and run from the 'iepm' user crontab. The servers and daemons are shut down once a day and restarted by 'kill-all-servers' and 'restart-all-servers' which also kill and restart the daemons around midnight.
Servers
The servers are the servers which are run on the monitoring system to respond to the probes from the other monitoring hosts. Each monitoring host has a customization directory called 'config' which must be customized for the monitoring host. Very often the copy of this is the same across all monitoring hosts. Currently this file 'config/servers.alive' contains the following lines:
bw-iperf-server,bin,-s \-p 5000 \-w 20M thrulayd,bin, pathload_snd,bin, \-q \-i map-updated,, pathchirp_snd,bin, owampd,bin, \-c /afs/slac/package/netmon/bandwidth-tests/v3src/config \-Z >& /tmp/owampd.log &
The first column is the name of the server, the second column is the directory it is in, and the third column is the list of parameters that it should be started with.
The servers are kept alive via the script 'keep-servers-alive'.
Daemons
The daemons are actually used to control the scheduling of probes, the probing, and the loading of the results from the probes into the data base. The daemons have a directory in the MySQL data directory '/home/iepm/mysql/keepalives'. They each touch their respective keep-alive file every time they cycle through. The script 'keep-em-alive' checks periodically the time stamps on the daemon keep-alives, and restarts them if they are not running.
The current daemons are:
bw-synchd.alive load-datad.alive load-scheduled.alive owpingd.alive pathchirpd.alive pingd.alive traced.alive
load-scheduled
'load-scheduled' reads the TOOLSPECS table periodically and looks for probes that are due to be run. Each probe has a 'lastrunepoch' field that is updated when that probes is run. 'load-scheduled' reads the 'lastrun' and the 'runinterval' fields, adds them together to tell if it is time to run another instance of the probe. If it is, it adds the command information to the SCHEDULE table.
load-datad
'load-datad' loops over all the 'load-test-data' scripts and calls them sequentially to load the data in the data base. All the results from the probes go into files in the '/home/iepm/mysql/data' with the name which is the 'scheduleid.probetype'.