[jira] [Resolved] (CLOUDSTACK-6665) DHCP does not release ip addresses properly on VPC routers (edithosts.sh)

["sebastien goasguen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CLOUDSTACK-6665?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

sebastien goasguen resolved CLOUDSTACK-6665.
--------------------------------------------

       Resolution: Fixed
    Fix Version/s: 4.3.1
                   4.4.0

> DHCP does not release ip addresses properly on VPC routers (edithosts.sh)
> -------------------------------------------------------------------------
>
>                 Key: CLOUDSTACK-6665
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-6665
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: SystemVM
>    Affects Versions: 4.3.0, 4.4.0
>            Reporter: Remi Bergsma
>            Priority: Critical
>             Fix For: 4.4.0, 4.3.1
>
>
> DHCP does not release ip addresses properly on VPC routers (edithosts.sh)
> How to reproduce:
> - create vpc network with small prefix
> - create as many vm’s until all ip address space is consumed
> - delete one vm
> - now create a vm again: there should be an ip address freed
> - it does not work though. Error on router:
> /var/log/dnsmasq.log:May 13 12:53:16 dnsmasq-dhcp[32100]: DHCPDISCOVER(eth3) 02:00:00:0d:00:b6 no address available
> How to reproduce #2:
> - create a vm with static ip
> - destroy it
> - create vm with same static ip: this ip should be free again
> This does not work either:
> /var/log/dnsmasq.log:May 13 13:59:41 dnsmasq-dhcp[32100]: DHCPDISCOVER(eth3) 02:00:69:06:00:c1 no address available
> Cause:
> edithosts.sh is supposed to clean up addresses.
> edithosts.sh line 101:
> dhcp_release eth0 $ipv4 $(grep "$ipv4 " $DHCP_LEASES | awk '{print $2}') > /dev/null 2>&1
> But it doesn’t work, because eth0 is the link local address on VPC routers. We should make the interface variable on VPC routers.
> It does work fine on redundant routers, for example. Because eth0 is the actual guest network.
> CloudStack reports to the user: Insufficient capacity.
> Manual work-around:
> Run on the router:
> dhcp_release eth3 02:00:69:06:00:c1 10.75.16.8
> Replace eth3 with the correct interface.
> It logs:
> /var/log/messages-20140419:May 13 13:38:29 r-4197-VM cloud: edithosts: released 10.75.16.8
> It now works!
> This an annoying bug for users that use static ip’s in their networks. Also users that deploy a lot of test vm’s in the same network are impacted. Let’s fix it :-)



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