opFlow Dashboard is Bare (graphs show no data)

It appears that you are not receiving any flows, have you had a look since you restarted it, it could take 2-5 minutes to start receiving and processing net flow records.

There is a couple of things it could be, which you can verify.

1. Has the IP address of the opFlow server or virtual machine changed?

If so, change net flow configurations in the network devices to send to new IP address.

2. Verify that "flowd" is running

ps -ef | grep flowd

You should see three entries as well as the grep one, e.g.

[root@thor opmantek]# ps -ef | grep flowd
root 13356 1 0 Jun18 ? 00:00:10 flowd: monitor 
_flowd 13357 13356 0 Jun18 ? 00:00:30 flowd: net 
root 27114 1 0 12:40 ? 00:00:00 NMIS opflowd debug=0
root 32567 27106 0 12:51 pts/5 00:00:00 grep flowd

The first two, flowd: are the Netflow daemon receiving flows, the NMIS one is the NMIS opflowd.

2a. If flowd is not running you can start it with the command:

service flowd start

Then repeat the ps -ef command, if it is not running you can check the syslog messages for why:

tail -50 /var/log/messages

Likely causes are full disks or permissions, or folders not existing.

2b. if opflowd is not running you can start it

Start it with the command below

service opflowd start

3. Verify that Mongo is running

[root@thor log]# ps -ef | grep mongo
root 4462 27106 0 12:59 pts/5 00:00:00 grep mongo
root 24809 1 0 Jun19 ? 04:26:07 /usr/local/mongodb/bin/mongod --dbpath /var/mongodb --fork --logpath /var/log/mongodb.log --logappend

Start it with the command below

service mongod start