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Re: com.cloud.agent.api.CheckRouterCommand timeout


Hi Daan,

Am 21.06.2018 um 15:29 schrieb Daan Hoogland:
> Melanie, attachments get deleted for this list. Your assumption for the
> comm path is right for xen. Did you try and execute the script as it is
> called by the proxy script from the host? and capture the return? We had a
> bad problem with getting the template version in the past on xen, this
> might be similar. That was due to processing of the returned string in the
> script.

I called both stages of the script manually but at at time, when all was
working as expected and the routers where back to MASTER and BACKUP.

Looked like:

[root@acs-compute-5 ~]# /opt/cloud/bin/router_proxy.sh checkrouter.sh
169.254.1.178
Status: BACKUP

root@r-2595-VM:~# /opt/cloud/bin/checkrouter.sh
Status: BACKUP


> 
> On Thu, Jun 21, 2018 at 1:16 PM, Melanie Desaive <
> m.desaive@xxxxxxxxxxxxxxxxxxx> wrote:
> 
>> Hi Daan,
>>
>> thanks for your reply.
>>
>> The latest occurance of our VRs going to UNKNOWN did resolve 24 hours
>> after it had occured. Nevertheless I would appreciate some insight into
>> how the checkRouter command is handled, as I expect the problem to come
>> back again.
>> Am 21.06.2018 um 10:39 schrieb Daan Hoogland:
>>> Melanie, this depends a bit on the type of hypervisor. The command
>> executes
>>> the checkrouter.sh script on the virtual router if it reaches it, but it
>>> seems your problem is before that. I would look at the network first and
>>> follow the path that the execution takes for your hypervisortype.
>>
>> With Stephans help I figured out the following guess for the path of
>> connections for the checkrouter command. Could someone please correct
>> me, if my guess is not correct. ;)
>>
>>  x Management Nodes connects to XenServer hypervisor host via management
>> network on port 22 by SSH
>>  x On hypervisor host the wrapper script
>> "/opt/cloud/bin/router_proxy.sh" is used to call scripts on system VMs
>> via link-local IP and port 3922
>>  x On the VR the script "/opt/cloud/bin/checkrouter.sh" does the actual
>> check.
>>
>> In our case the API call times out with log messages
>>  x Operation timed out: Commands 1063975411966525473 to Host 29 timed
>> out after 60
>>  x Unable to update router r-2595-VM's status
>>  x Redundant virtual router (name: r-2595-VM, id: 2595)  just switch
>> from BACKUP to UNKNOWN
>>
>> To me it seems that this is a timeout that occurs when ACS management is
>> waitig for the API call to return. At what stage (management host <->
>> virtualization host) or (virutalization host <-> VR> the answer is
>> delayed is unclear to me. (SSH Login from virtualization host to VR via
>> link-local is working all the time)
>>
>> And it is unclear to me, why both VRs of the respective network stay in
>> UNKNOWN for 24 hours, are accessible via link-local but come back
>> immedately after a reboot.
>>
>> I am happy for any suggestions or explanations in this topic and will
>> investigate further as soon, as the problem comes back again.
>>
>> A portion of our management log for the latest occurance of the problem
>> is attached to this email.
>>
>> Greetings,
>>
>> Melanie
>>
>>>
>>> On Wed, Jun 20, 2018 at 1:53 PM, Melanie Desaive <
>>> m.desaive@xxxxxxxxxxxxxxxxxxx> wrote:
>>>
>>>> Hi all,
>>>>
>>>> we have a recurring problem with our virtual routers. By the log
>>>> messages it seems that com.cloud.agent.api.CheckRouterCommand runs into
>>>> a timeout and therefore switches to UNKNOWN.
>>>>
>>>> All network traffic through the routers is still working. They can be
>>>> accessed by their link-local IP adresses, and configuration looks good
>>>> at a first sight. But configuration changes through the CloudStack API
>>>> do no longer reach the routers. A reboot fixes the problem.
>>>>
>>>> I would like to investigate a little further but lack understanding
>>>> about how the checkRouter command is trying to access the virtual
>> router.
>>>>
>>>> Could someone point me to some relevant documentation or give a short
>>>> overview how the connection from CS-Management is done and where such an
>>>> timeout could occur?
>>>>
>>>> As background information - the sequence from the management log looks
>>>> kind of this:
>>>>
>>>> ---
>>>>
>>>>  x Every few seconds the com.cloud.agent.api.CheckRouterCommand returns
>>>> a state BACKUP or MASTER correctly
>>>>  x When the problem occurs the log messages change. Some snippets below
>>>>
>>>>  x ... Waiting some more time because this is the current command
>>>>  x ... Waiting some more time because this is the current command
>>>>  x Could not find exception:
>>>> com.cloud.exception.OperationTimedoutException in error code list for
>>>> exceptions
>>>>  x Timed out on Seq 28-2352567855348137104
>>>>  x Seq 28-2352567855348137104: Cancelling.
>>>>  x Operation timed out: Commands 2352567855348137104 to Host 28 timed
>>>> out after 60
>>>>  x Unable to update router r-2594-VM's status
>>>>  x Redundant virtual router (name: r-2594-VM, id: 2594)  just switch
>>>> from MASTER to UNKNOWN
>>>>
>>>>  x Those error messages are now repeated for each following
>>>> CheckRouterCommand until the virtual router is rebootet
>>>>
>>>>
>>>> Greetings,
>>>>
>>>> Melanie
>>>>
>>>> --
>>>> --
>>>>
>>>> Heinlein Support GmbH
>>>> Linux: Akademie - Support - Hosting
>>>>
>>>> http://www.heinlein-support.de
>>>> Tel: 030 / 40 50 51 - 0
>>>> Fax: 030 / 40 50 51 - 19
>>>>
>>>> Zwangsangaben lt. §35a GmbHG:
>>>> HRB 93818 B / Amtsgericht Berlin-Charlottenburg,
>>>> Geschäftsführer: Peer Heinlein  -- Sitz: Berlin
>>>>
>>>
>>>
>>>
>>
>> --
>> --
>>
>> Heinlein Support GmbH
>> Linux: Akademie - Support - Hosting
>>
>> http://www.heinlein-support.de
>> Tel: 030 / 40 50 51 - 0
>> Fax: 030 / 40 50 51 - 19
>>
>> Zwangsangaben lt. §35a GmbHG:
>> HRB 93818 B / Amtsgericht Berlin-Charlottenburg,
>> Geschäftsführer: Peer Heinlein  -- Sitz: Berlin
>>
> 
> 
> 

-- 
--

Heinlein Support GmbH
Linux: Akademie - Support - Hosting

http://www.heinlein-support.de
Tel: 030 / 40 50 51 - 0
Fax: 030 / 40 50 51 - 19

Zwangsangaben lt. §35a GmbHG:
HRB 93818 B / Amtsgericht Berlin-Charlottenburg,
Geschäftsführer: Peer Heinlein  -- Sitz: Berlin