Hi, Experts, Recently I found VMs on my OpenStack Liberty will get lost their private IP address after running normally for 1~2 days("#ip addr" will show no IP associated with eth0 for example), thus could not be ssh login anymore. But after console login to the instances from Horizon and restart the network(# service network restart), everything returns normal and they could be ssh login again( eth0 now gets it IP). From nova-compute.log I see there are messages like "NeutronClientException: *Authentication required*". But the keystone service runs normally and no other service are affected. Any hint about the problem? Thanks a lot!
Cheers, Dan
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