Applicable to:
- SolusVM 2
Symptoms
Following a SolusVM 2 upgrade, VMs experience a network outage: network briefly appears functional immediately after the upgrade, then fails once a VM is started, restarted, or created.
Cause
The SolusVM 2 upgrade process restarts the OVS (Open vSwitch) service, which clears all existing flow rules from the host. This leaves the host briefly functional but unprotected (no ARP whitelist rules in place).
As soon as any VM is started, restarted, or created, that VM applies ARP rules operating in whitelist mode. Because the OVS restart removed all existing whitelist rules, traffic for VMs that have not yet had their rules reapplied is treated as non-whitelisted and is dropped - causing the network outage.
Resolution
This is a known issue and has been fixed under the label: SVM2-6538 in the release notes.
Monitor the Release-notes of upcoming SolusVM 2 updates for reference to SVM2-6538, which will indicate that a permanent fix has been released. Then update your product.
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