VM loses connectivity when another one is started

asked 2017-01-30 06:19:32 -0500

VincentSwiss gravatar image

Hello everyone,

I have a HA Openstack environment provisioned with Fuel, I've ran Mitaka in a first environment for months without problems. Now I have new hardware and so I'm in the process of building a new Openstack Environment. I've been testing it for the last few days and I get some weird behavior which I cant seem to solve.

This happens as far as I could see randomly, but sometimes when I start a new VM, after a few seconds I get disconnected from the existing ones on which I was working (having an SSH connection open), after the disconnect, I can re-log in without problems. (I've checked the SSH timeout and that's not the cause of the problem).

Neutron logs don't show any anomalies or errors. Same for OVS logs.

Another strange behaviour I've experienced is that once a VM is started with a Floating IP it can connect to the internet and so on but when I want to ping it or ssh to it it does't work, the connection is refused, like if neutron didn't update the firewall entry. As a workaround the VM needs to be rebooted and the Floating IP has to be disassociated and re-associated again.

Has anybody experienced the same problems? Do you have any suggestions on what could be the cause of these problems?

Thank you and best regards,


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