Troubleshooting perfSONAR

(Page under construction.)

This page contains some hints on how to troubleshoot perfSONAR 4.0 and later.

System

SELinux

Check that SELinux is disabled or in permissive mode:

getenforce

If SELinux is in Enforcing mode, change it to permissive and make the change permanent:

setenforce Permissive
sed -i -e 's/^SELINUX=enforcing/SELINUX=permissive/' /etc/selinux/config

pScheduler

pScheduler on Local Host

Confirm that pScheduler on the local system is functioning:

pscheduler ping localhost

Check that pScheduler on the local system isn’t reporting problems:

fgrep ' ERROR ' /var/log/pscheduler/pscheduler.log

Run basic tests on the local system:

pscheduler task idle --duration PT2S
pscheduler task rtt --dest 127.0.0.1

pScheduler on Remote Hosts

Confirm that pScheduler on the other host (REMOTE-HOST) is reachable and working:

pscheduler ping REMOTE-HOST

Run basic tests to the other host (the first test requires that TCP ports 5890-5899 be open on that system):

pscheduler task trace --dest REMOTE-HOST
pscheduler task rtt --dest REMOTE-HOST
pscheduler task simplestream --dest REMOTE-HOST
pscheduler task throughput --bandwidth 1M --dest REMOTE-HOST

Run the same tests in the opposite direction (from REMOTE-HOST to LOCAL-HOST):

pscheduler task trace --source REMOTE-HOST --dest LOCAL-HOST
pscheduler task rtt --source REMOTE-HOST --dest LOCAL-HOST
pscheduler task simplestream --source REMOTE-HOST --dest LOCAL-HOST
pscheduler task throughput --bandwidth 1M --source REMOTE-HOST --dest LOCAL-HOST

Checking the Schedule

If results are missing, looking at the pScheduler’s timeline of runs (the schedule) can be useful.

Note that --host HOST-NAME can be added to the switches to retrieve the schedule from other hosts.

Retrieve the schedule for a specified range of times:

pscheduler schedule 2017-05-02T12:00:00 2017-05-02T12:10:00

Retrieve the schedule for a specified range of times relative to right now:

pscheduler schedule -PT10M +PT5M

Watch at the schedule in real time:

pscheduler monitor --refresh=5

Look for tests that failed to start in the past 2 hours:

pscheduler schedule -PT2H | grep -2 Non-Starter

Look at schedule details for throughput tests in the last hour involving the host TEST-HOST:

pscheduler schedule --filter-test=throughput -PT1H | grep -2 TEST-HOST | grep -2 iperf3

Same as above, but for a specific tool and test:

pscheduler schedule --filter-test=throughput -PT1H | egrep -2  "(nuttcp|iperf3)" | grep -2 TEST-HOST

To retrieve results and diagnostics for a single run using a run URL shown by the schedule command:

pscheduler result --diags --archivings RUN-URL

Generate a plot of the schedule that shows congestion:

pscheduler plot-schedule -PT30M +PT30M > plot.png

Additional Debug Logging

The programs that manage pScheduler’s activities can produce additional debugging information useful to the development team in finding problems.

To enable logging of debug output from pScheduler’s components, run (as root):

pscheduler debug on PROGRAMS

Where PROGRAMS is a list of any of scheduler, runner, archiver, ticker or api. Turning on debug for anything other than scheduler and runner rarely be necessary. If no list is provided, debug will be enabled for all pScheduler programs.

Logging can be disabled by running:

pscheduler debug off PROGRAMS

More information on the pscheduler error messages you might find in the logs is available at: