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Lessons learned from support cases - common things to look for.

Does DNS function properly?

If not any daemon that's doing name resolution will be very slow.   Verify the system has an FQDN and resolves to itself.  Also check if it can resolve other hosts.

### Check the local systems fqdn
screen [root@demo: ~]# hostname -f
demo.opmantek.com

### can the local system resolve it's own hostname?
screen [root@demo: ~]# dig +short demo.opmantek.com 
192.168.88.44

### Can the system resolve other hosts?
screen [root@demo: ~]# dig +short freebsd.org
8.8.178.110

Does the system have the correct time?  Is it synced with a time server?

[nmis@demo var]$ ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
+cachens2.onqnet 13.64.159.31     3 u  426 1024  377    4.845   -0.126   0.458
+ec2-13-54-31-22 54.252.165.245   3 u  352 1024  377   18.036    1.540   1.008
-node01.au.verbn 192.12.19.20     2 u  514 1024  377   18.966  -16.530   1.176
*ntp3.syrahost.c 218.100.43.70    2 u  422 1024  377   63.642   -1.172   0.852

[nmis@demo var]$ date -u
2017. 02. 16. (?) 22:33:31 UTC

 

Compare the system UTC time with actual UTC time.  A site such as https://time.is/UTC will show current UTC time.

If the system time is not correct it will result in a lot of problems.

  • Time stamps not correct on events
  • Graph data not correct
  • Transactions with other systems fail (e.g. cookies could already be expired at the time of issue.)

NMIS Troubleshooting

Email alerts

Contacts.nmis must have the correct DutyTime format.

External Authentication

conf/Config.nmis must have the proper auth_method order as well as that method being provisioned.

opCharts Troubleshooting

TopN

Use the following utility to troubleshoot why charts are being populated into TopN

/usr/local/omk/bin/nmis_topn_export.exe debug=true timing=1 force=1 > topnDebug.txt
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