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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (CLOUDSTACK-10326) Prevent hosts fall into Maintenance when there are running VMs on it
Date Wed, 20 Jun 2018 14:54:00 GMT


ASF GitHub Bot commented on CLOUDSTACK-10326:

nvazquez commented on issue #2493: CLOUDSTACK-10326: Prevent hosts fall into Maintenance when
there are running VMs on it
   Thanks guys, can we proceed merging it?

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> Prevent hosts fall into Maintenance when there are running VMs on it
> --------------------------------------------------------------------
>                 Key: CLOUDSTACK-10326
>                 URL:
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>    Affects Versions:
>            Reporter: Nicolas Vazquez
>            Assignee: Nicolas Vazquez
>            Priority: Major
>             Fix For:
>         Attachments: CLOUDSTACK-10326-Debug.png, CLOUDSTACK-10326-InitialState.png, CLOUDSTACK-10326-Migrating.png,
> This issue was discovered, fixed and tested on KVM, but applies for every hypervisor.
> h2. Background
> When enabling maintenance mode in a host, host state is put into 'PrepareForMaintenance'
and running VMs are migrated into another host. After every VM is migrated, host goes to 'Maintenance'
> Checks are performed on ResourceManagerImpl.checkAndMaintan() method:
>  * List VMs with host_id = HOST_ID
>  * List VMs with last_host_id = HOST_ID and state=Migrating
> When both queries are empty, then the host can be put into Maintenance.
> When a VM is being migrated to DEST_HOST, its host_id column is set to DEST_HOST, last_host_id
= ORIGIN_HOST and state = Migrating. If then migration fails, host_id = last_host_id = ORIGIN_HOST 
> h2. Issue
> This sequence:
>  * Enable maintenance mode on ORIGIN_HOST
>  * VMs start being migrated to a host, say DEST_HOST
>  * checkAndMaintain() starts:
>  ** First check passes (no VM with host_id = ORIGIN_HOST_ID as those are being migrated)
>  ** Before the second check, one or more migrations fail
>  ** Second check passes, however there are VMs running on the host as migrations have
>  * Host goes into Maintenance state.
> Screenshots attached, query executed on each case:
> select id, name, instance_name, state, host_id, last_host_id from vm_instance;

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