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https://issues.apache.org/jira/browse/CLOUDSTACK-8530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14569046#comment-14569046
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ASF GitHub Bot commented on CLOUDSTACK-8530:
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Github user bhaisaab commented on the pull request:
https://github.com/apache/cloudstack/pull/340#issuecomment-107943645
@wilderrodrigues thanks, but the test you did is perhaps not enough as it
cleanly shutsdown the agent. In my test, I did these things:
- kill -9 the agent to see what happens
- add firewall rule to block mgmt server traffic to the kvm host, using
something like: iptables -A INPUT -s 192.168.1.12 -j DROP
- using a cluster of three nodes, add the firewall rules to see how it
behaves when neighbours report it is Up/Down and host is not reachable
> KVM hosts without active agent connection are still "Up"
> --------------------------------------------------------
>
> Key: CLOUDSTACK-8530
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-8530
> Project: CloudStack
> Issue Type: Bug
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Components: KVM
> Reporter: Rohit Yadav
> Assignee: Rohit Yadav
> Fix For: 4.6.0, 4.5.2
>
>
> KVM hosts without active agent connection are still "Up". In case a KVM host
> get uncleanly disconnected from the mgmt server, for example due to a
> firewall rule or physical nic unplugging the neighbour KVM hosts might
> investigate and report that the KVM host is in Up state but since mgmt server
> is not connected to the agent (on that host), all further commands such as VM
> migrations, VM deployments etc fail.
> The best fix would be to have the investigator check the KVM host itself and
> if it's unable to contact return the state as disconnected, this way no HA
> for VMs will be triggered.
> To reproduce the issue:
> 1. On a KVM host, drop packets from mgmt server host IP: iptables -A INPUT -s
> 192.168.1.12 -j DROP (here 192.168.1.12 is the mgmt server IP)
> 2. After Investigator kicks in neighbours report that it's Up, now deploy a
> VM on this host it fails.
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