I upgraded to Pacific 16.2.5 about a month ago and everything was working fine. 
Suddenly for the past few days I’ve started having the tcmu-runner container on 
my iSCSI gateways just disappear. I’m assuming this is because they have 
crashed. I deployed the services using cephadm / ceph orch in Docker 
containers. 
It appears that when the service crashes, the container just disappears and it 
doesn’t look like tcmu-runner is exporting logs anywhere, so I can’t figure out 
any way to determine the root cause of these failures. When this happens, it 
appears to cause issues where I can’t reboot the machine (Running CentOS 8) and 
I need to power-cycle the server to recover. 

I’m really not sure where to look to figure out why it’s suddenly failing. The 
failure is happening randomly on all 4 of the iSCSI gateways. Any pointers 
would be greatly appreciated. 

-Paul

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