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If you run ONOS remotely using onos-install, you can use the tool onos-log <instance> (e.g. onos-log $OC1) to follow the log.
If you are using onos.py, the log is also linked to /tmp/onos1/log (replace onos1 with the name of the ONOS instance whose log you wish to view)
How can I tell if ONOS encountered an error at runtime?
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