[GitHub] [cloudstack] andrijapanicsb commented on pull request #6942: ssvm: synchorise when adding iptables and routing rules

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andrijapanicsb commented on PR #6942:
URL: https://github.com/apache/cloudstack/pull/6942#issuecomment-1335181942

   thx @rohityadavcloud 
   
   For the record: this has been impossible to reproduce in my test env (based on the instructions given by the relevant third party) - the problem is when doing multiple volume snapshots in multiple clusters, at the exact same time - ACS tries to add iptables rule inside SSVM to allow outgoing traffic (to vCenter I think) - and since there are multiple concurrent attempts to add iptable rule - some of those would fail (since iptable has an internal locking mechanism where it creates a lock while an rule is being added, so another rule/thread can not run) - so some of the snapshot jobs would fail as a consequence of not being able to add iptable rule.


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