Dear all,
I have a small Ocata installation (1x controller + 2x compute nodes) on
which I have manually created 5 network ports and afterwards each one of
these ports is assigned to a specific instance (4Linux VMs and
1Windows). All these instances are located on one physical hypervisor
(compute node) while the controller is also the networking node.
The other day we had to do system maintenance and all hosts (compute
and network/controller) were powered off but before that we gracefully
shutoff all running VMs.
As soon as maintenance finished we powered on everything and I met the
following strange issue... Instances with an attached port were trying
for very long time to get an IP from the DHCP server but they all manage
to get one eventually with the exception of the Windows VM on which I
had to assign it statically. Restarting networking services on
controller/network and/or compute node didn't make any difference. On
the other hand all newly spawned instances didn't have any problem no
matter on which compute node they were spawned and their only difference
was that they were automatically getting ports assigned. All the above
happened on Friday and today (Monday) people were complaining that the
Linux VMs didn't have network connectivity (Windows was working...), so
I don't know the exact time the issue occured. I have tried to access
all VMs using the "self-service" network by spawning a new instance
unfortunately without success. The instance was successfully spawned, it
had network connectivity but couldn't reach any of the afforementioned
VMs.
What I did finally and solved the problem was to detach interfaces,
deleted ports, re-created new ports with same IP address etc. and
re-attached them to the VMs. As soon as I did that networking
connectivity was back to normal without even having to restart the VMs.
Unfortunately I couldn't find any helpful information regarding this in
the logs and I am wondering has anyone seen or experienced something
similar?
Best regards,
G.
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