Ran into an issue where I was not able to list the installed ZenPacks and Zenoss was having issues starting. I think it was due to a ZenPack having issues and not being installed properly.
Drop into the container
serviced service shell -i -s FixZenpack zope bash
Change user and cd to ZenPack directory
su zenoss cd /opt/zenoss/ZenPacks
Once there, remove the offending ZenPack. Replace ZENPACK.egg with the ZenPack
rm -rf ./ZENPACK.egg
rm -rf ./ZenPacks.zenoss.MikroTik-1.1.1.egg
Exit out of the container.
You can also hit ctrl+d twice.
Commit the Container
serviced service shell -i -s FixZen zope bash
Restart the Zenoss.Core Service
service service restart Zenoss.Core