Accessing logs

The MicroOVN services provide logs as part of their normal operation.

By default they are provided through the systemd journal, and can be accessed through the use of the journalctl or snap logs commands.

This is how you can access the logs of the microovn.chassis service using the snap logs command:

snap logs microovn.chassis

and using the journalctl command:

journalctl -u snap.microovn.chassis

This is how you can view a live log display for the same service using the snap logs command:

snap logs -f microovn.chassis

and using the journalctl command:

journalctl -f -u snap.microovn.chassis

Log files

Inside the /var/snap/microovn/common/logs directory you will find files for each individual service, however these will either be empty or not contain updated information, this is intentional.

On a fresh install the files are created, as a precaution, in the event a need arises for enabling debug logging. When upgrading MicroOVN, existing files will be retained, but not updated.

Debug logging

The Open vSwitch (OVS) and Open Virtual Network (OVN) daemons have a rich set of debug features, one of which is the ability to specify log levels for individual modules at run time.

A list of modules can be acquired through the ovs-appctl and ovn-appctl commands.

This is how to enable debug logging for the Open vSwitch vswitchd module:

ovs-appctl vlog/set vswitchd:file:dbg

This is how to enable debug logging for the Open Virtual Network reconnect module:

ovn-appctl vlog/set reconnect:file:dbg

For more details on how to configure logging, see ovs-appctl manpage.