Re: [ovirt-users] How to update ovirt on a single-host hosted-engine host

[Derek Atkins]

Hi,

"Derek Atkins"  writes:

> Hi,
>
> All storage is NFS storage exported by the host itself.  i didn't mention
> it because it shouldn't have mattered -- the HE export mounted but the
> others didn't..  Although it appears this may all have been due to the
> network issues between engine and host -- once I added a workaround to
> that issue the mounting issues seemed to resolve themselves.
>
> I'm not sure why I'm having this network issue.  The engine VM gets an ARP
> Redirect and then can't reach the host anymore -- but of course the host
> can reach the VM.  It's a strange issue that I haven't been able to track
> down (but is most likely not related to ovirt).

For what it's worth, it did come back after I:

1) worked around a strange networking problem where the engine couldn't
   reach the host.  I still need to figure out why I'm having this
   network issue, where the machines stop being able to communicate.  I
   don't think this is an ovirt issue, I suspect an ARP issue on my
   network.

2) Waited..  it took about 15 minutes to stabilize.

-derek
-- 
   Derek Atkins 617-623-3745
   de...@ihtfp.com www.ihtfp.com
   Computer and Internet Security Consultant
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Re: [ovirt-users] How to update ovirt on a single-host hosted-engine host

[Derek Atkins]

Hi,

On Fri, November 25, 2016 1:02 pm, Gianluca Cecchi wrote:
> Il 24/Nov/2016 20:34, "Derek Atkins"  ha scritto:
>>
>> Hi,
>>
>> I've got ovirt running on a single host (with hosted-engine).  I just
>> upgraded the engine from 4.0.4 to 4.0.5.  That was pretty easy; I just
>> put the system into global maintenance mode, then yum update, then
>> engine-setup, then took the host out of maint mode.  Easy peasy.
>>
>> Now, I want to update the host itself.  Since it's a single host system
>> I know I'll need to shut down all the VMs (because there's no place to
>> migrate them).  This means I'll need to shut down the engine VM, too.
>> That would imply that I can't use the "Update" feature from the ui,
>> right?
>>
>> So what IS the process to properly update a single-host host?
>
> It seems you didn't specify the kind of storage you are using...
> Anything provided by the host itself or what?

All storage is NFS storage exported by the host itself.  i didn't mention
it because it shouldn't have mattered -- the HE export mounted but the
others didn't..  Although it appears this may all have been due to the
network issues between engine and host -- once I added a workaround to
that issue the mounting issues seemed to resolve themselves.

I'm not sure why I'm having this network issue.  The engine VM gets an ARP
Redirect and then can't reach the host anymore -- but of course the host
can reach the VM.  It's a strange issue that I haven't been able to track
down (but is most likely not related to ovirt).

Thanks,

-derek

-- 
   Derek Atkins 617-623-3745
   de...@ihtfp.com www.ihtfp.com
   Computer and Internet Security Consultant

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Re: [ovirt-users] How to update ovirt on a single-host hosted-engine host

[Gianluca Cecchi]

Il 24/Nov/2016 20:34, "Derek Atkins"  ha scritto:
>
> Hi,
>
> I've got ovirt running on a single host (with hosted-engine).  I just
> upgraded the engine from 4.0.4 to 4.0.5.  That was pretty easy; I just
> put the system into global maintenance mode, then yum update, then
> engine-setup, then took the host out of maint mode.  Easy peasy.
>
> Now, I want to update the host itself.  Since it's a single host system
> I know I'll need to shut down all the VMs (because there's no place to
> migrate them).  This means I'll need to shut down the engine VM, too.
> That would imply that I can't use the "Update" feature from the ui,
> right?
>
> So what IS the process to properly update a single-host host?

It seems you didn't specify the kind of storage you are using...
Anything provided by the host itself or what?
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Re: [ovirt-users] How to update ovirt on a single-host hosted-engine host

[Derek Atkins]

HELP!!!

I just did this, but now my storage isn't showing up!  According to
"mount", only the HE domain is mounted, but none of my other domains
mounted.  Running 'hosted-engine --connect-storage' does not seem to mount
the storage domains.

If I bring the engine up, it still wont access those domains.  And indeed,
now the host is showing up as non-responsive to the engine.

on the host, I see:

[root@ovirt-0 ~]# hosted-engine --vm-status


--== Host 1 status ==--

Status up-to-date  : True
Hostname   : OVIRT-0{.dom.ain}
Host ID: 1
Engine status  : {"health": "good", "vm": "up",
"detail": "up"}
Score  : 3400
stopped: False
Local maintenance  : False
crc32  : 76ac9280
Host timestamp : 985
Extra metadata (valid at timestamp):
metadata_parse_version=1
metadata_feature_version=1
timestamp=985 (Fri Nov 25 11:35:39 2016)
host-id=1
score=3400
maintenance=False
state=EngineUp
stopped=False

So the host seems to think the engine is up.

I can't mount the storage from the UI because the engine claims the host
is non-responsive.  Not surprisingly, this appears to be due to a
networking issue that I didn't have before the update.  Indeed, the engine
can't reach the host, even though I can reach both (and the host can reach
the engine).  Did the host update somehow change the iptables
configuration?  It doesn't look like it.  But I'm not sure why the network
isn't working now when it was working before the update.

So, now what do I do?  I suppose I can check my host backup from last
night and see if I can see anything different in the vdsm configs?

There are two problems to solve:

1) Host doesn't mount my storage
2) Engine can't reach host via network.

HELP!

-derek

On Fri, November 25, 2016 9:53 am, Derek Atkins wrote:
> Hi Simone,
>
> On Fri, November 25, 2016 4:34 am, Simone Tiraboschi wrote:
>> On Thu, Nov 24, 2016 at 8:33 PM, Derek Atkins  wrote:
>
> [snip]
>>> So what IS the process to properly update a single-host host?  My guess
>>> is:
>>>
>>> * shutdown all the VMs
>>>
>> * go into global maint mode (what IS the difference between global and
>>>   local?)
>>> * shutdown the engine/engine VM
>>> * yum update on the host
>>> * restart services (or reboot, I guess)
>>> * bring the system out of maintenance mode
>>>
>>
>> shutdown or hibernate all the other VMs.
>> set global maintenance mode to avoid ovirt-ha-agent trying to restart
>> the
>> engine vm
>> shutdown the engine VM (from the host CLI) with hosted-engine
>> --vm-shutdown
>
> This is in lieu of "shutdown -h now" from the engine VM?  (i.e., will this
> perform a clean shutdown from within the VM?)
>
>> yum update
>> restart services
>
> So I don't need to run a host equivalent of "engine-setup"?  Great.
>
>> bring the system out of global maintenance mode: in a couple of minutes
>> the
>> HA agent should restart the engine VM
>
> Perfect.  Thanks.  I'll go test this shortly.
>
> -derek
>
> --
>Derek Atkins 617-623-3745
>de...@ihtfp.com www.ihtfp.com
>Computer and Internet Security Consultant
>
> ___
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>


-- 
   Derek Atkins 617-623-3745
   de...@ihtfp.com www.ihtfp.com
   Computer and Internet Security Consultant

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Re: [ovirt-users] How to update ovirt on a single-host hosted-engine host

[Simone Tiraboschi]

On Fri, Nov 25, 2016 at 3:53 PM, Derek Atkins  wrote:

> Hi Simone,
>
> On Fri, November 25, 2016 4:34 am, Simone Tiraboschi wrote:
> > On Thu, Nov 24, 2016 at 8:33 PM, Derek Atkins  wrote:
>
> [snip]
> >> So what IS the process to properly update a single-host host?  My guess
> >> is:
> >>
> >> * shutdown all the VMs
> >>
> > * go into global maint mode (what IS the difference between global and
> >>   local?)
> >> * shutdown the engine/engine VM
> >> * yum update on the host
> >> * restart services (or reboot, I guess)
> >> * bring the system out of maintenance mode
> >>
> >
> > shutdown or hibernate all the other VMs.
> > set global maintenance mode to avoid ovirt-ha-agent trying to restart the
> > engine vm
> > shutdown the engine VM (from the host CLI) with hosted-engine
> > --vm-shutdown
>
> This is in lieu of "shutdown -h now" from the engine VM?  (i.e., will this
> perform a clean shutdown from within the VM?)
>
>
Yes, exactly.
For emergency issue you also have hosted-engine --vm-poweroff to perform an
instant poweroff.


> > yum update
> > restart services
>
> So I don't need to run a host equivalent of "engine-setup"?  Great.
>
> > bring the system out of global maintenance mode: in a couple of minutes
> > the
> > HA agent should restart the engine VM
>
> Perfect.  Thanks.  I'll go test this shortly.
>
> -derek
>
> --
>Derek Atkins 617-623-3745
>de...@ihtfp.com www.ihtfp.com
>Computer and Internet Security Consultant
>
>
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Re: [ovirt-users] How to update ovirt on a single-host hosted-engine host

[Derek Atkins]

Hi Simone,

On Fri, November 25, 2016 4:34 am, Simone Tiraboschi wrote:
> On Thu, Nov 24, 2016 at 8:33 PM, Derek Atkins  wrote:

[snip]
>> So what IS the process to properly update a single-host host?  My guess
>> is:
>>
>> * shutdown all the VMs
>>
> * go into global maint mode (what IS the difference between global and
>>   local?)
>> * shutdown the engine/engine VM
>> * yum update on the host
>> * restart services (or reboot, I guess)
>> * bring the system out of maintenance mode
>>
>
> shutdown or hibernate all the other VMs.
> set global maintenance mode to avoid ovirt-ha-agent trying to restart the
> engine vm
> shutdown the engine VM (from the host CLI) with hosted-engine
> --vm-shutdown

This is in lieu of "shutdown -h now" from the engine VM?  (i.e., will this
perform a clean shutdown from within the VM?)

> yum update
> restart services

So I don't need to run a host equivalent of "engine-setup"?  Great.

> bring the system out of global maintenance mode: in a couple of minutes
> the
> HA agent should restart the engine VM

Perfect.  Thanks.  I'll go test this shortly.

-derek

-- 
   Derek Atkins 617-623-3745
   de...@ihtfp.com www.ihtfp.com
   Computer and Internet Security Consultant

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