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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-4786) Redundant router: the priority limitation
Date Fri, 18 Oct 2013 03:15:42 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-4786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13798751#comment-13798751
] 

ASF subversion and git services commented on CLOUDSTACK-4786:
-------------------------------------------------------------

Commit 85dc65c7f766e76ff57816127578adca5ade1c54 in branch refs/heads/master from [~yasker]
[ https://git-wip-us.apache.org/repos/asf?p=cloudstack.git;h=85dc65c ]

CLOUDSTACK-4786: Reset Redundant Router priority after all the routers are stopped

This patch would reset the priority in such condition:
1. All redundant routers are stopped, e.g. due to network GC
2. User start one VM in the network
3. The routers would be brought up with reseted priority(100 & 99).

This would resolve the issue of network GC result in lower limit of redundant router priority
reached.


> Redundant router: the priority limitation
> -----------------------------------------
>
>                 Key: CLOUDSTACK-4786
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-4786
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: Network Devices
>    Affects Versions: 4.2.0
>            Reporter: Sheng Yang
>            Assignee: Sheng Yang
>             Fix For: 4.2.1
>
>
> The limitation states that when using RVR, Network GC can run only 40 times or RVR can
only be restarted 40 times or Guest VM can only be restart 40 times before having the need
to restart the network with cleanup=true (downtime).
> Example:
> 1. Let us say there is one VM in an account/network, VM1.
> 2. It is using 1 network, say N1 and it's created from a network offering that
> has redundant router enabled.
> 3. When VM1 was launched, two RVRs were created, say R1 and R2.
> 4. At that time R1 has priority set to 100 and R2 99. This is the default
> behavior.
> 5. Network GC is set to run every 30 minutes.
> 6. Let us draw a base line here, VM1 is running, R1 is running and has priority set to
100, R2 is running as has priority set to 99.
> 7. Stop VM1.
> 8. Wait for 30+ minutes.
> 9. Check R1 and R2, they will be stopped.
> 10. Start VM1.
> 11. R1 and R2 will be started and their priorities will now be set to 99 and 98 resp.
> 12. If you repeat steps #7 through #10, you will observe that after 40 tries
> priorities of R1 and R2 would be 20 and 19. You will observe that the RVR won't start.
It will complain about the priority being too low.
> The only workaround now is to restart network with cleanup=true, basically
> destroy old routers and create new ones.



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