On 5/28/19 6:16 AM, li jerry wrote:
> Hello guys
>
> we’ve deployed an environment with CloudStack 4.11.2 and KVM(CentOS7.6), and
> Ceph 13.2.5 is deployed as the primary storage.
> We found some issues with the HA solution, and we are here to ask for you
> suggestions.
>
> We’ve both enabled VM HA and Host HA feature in CloudStack, and the compute
> offering is tagged as ha.
> When we try to perform a power failure test (unplug 1 node of 4), the running
> VMs on the removed node is automatically rescheduled to the other living
> nodes after 5 minutes, but all of them can not boot into the OS. We found the
> booting procedure is stuck by the IO read/write failure.
>
>
>
> The following information is prompted after VM starts:
>
> Generating "/run/initramfs/rdsosreport.txt"
>
> Entering emergency mode. Exit the shell to continue.
> Type "journalctl" to view system logs.
> You might want to save "/run/initramfs/rdsosreport.txt" to a USB stick or
> /boot
> after mounting them and attach it to a bug report
>
> :/#
>
>
>
> We found this is caused by the lock on the image:
> [root@cn01-nodea ~]# rbd lock list a93010b0-2be2-49bd-b25e-ec89b3a98b4b
> There is 1 exclusive lock on this image.
> Locker ID Address
> client.1164351 auto 94464726847232 10.226.16.128:0/3002249644
>
> If we remove the lock from the image, and restart the VM under CloudStack,
> this VM will boot successfully.
>
> We know that if we disable the Exclusive Lock feature (by setting
> rbd_default_features = 3) for Ceph would solve this problem. But we don’t
> think it’s the best solution for the HA, so could you please give us some
> ideas about how you are doing and what is the best practice for this feature?
>
exclusive-lock is something to prevent a split-brain and having two
clients write to it at the same time.
The lock should be released to the other client if this is requested,
but I have the feeling that you might have a cephx problem there.
Can you post the output of:
$ ceph auth get client.X
Where you replace X by the user you are using for CloudStack? Also
remove they 'key', I don't need that.
I want to look at the caps of the user.
Wido
> Thanks.
>
>
