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From David Merrill <david.merr...@otelco.com>
Subject Re: Upgrading XenServer Clusters managed by ACS...
Date Wed, 01 Jul 2020 17:37:28 GMT
Andrija,

I appreciate you sharing your thoughts on this. I'm getting my ducks in a row on the XenServer
side (for the upgrade) & I'll give the plan a go.

I'll report in afterwards, wish me luck!

Thanks,
David

David Merrill
Senior Systems Engineer,
Managed and Private/Hybrid Cloud Services
OTELCO
92 Oak Street, Portland ME 04101
office 207.772.5678 <callto:207.772.5678>
http://www.otelco.com/cloud-and-managed-services
 
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On 6/30/20, 1:03 PM, "Andrija Panic" <andrija.panic@gmail.com> wrote:

    Hi  David,
    
    with a bit of delay...
    
    those steps need to be tested - I would skip the whole
    "environment.properties" file and see how it behaves today - the reason
    being that, though the article on shapeblue.com was old, it does mention
    both "Unmanage" cluster and Maintenace mode - so I'm not quite sure what is
    the difference today vs. how it behaved back in time of ACS 4.3 / XS 6.2 -
    the explanation that you've found on the mailing thread may not make sense,
    I mean specifically the "There wasn't an 'unmanage' button at the time",
    since the article clearly mentions it).
    
    There is also no need to manually migrate VM's away from a host (i.e. pool
    master) - simply put it into the Maintenance mode and it will move VMs away
    to other hosts.
    
    Assuming that putting the pool-master into Maintenance mode in ACS will,
    these days, NOT trigger a new host to become a master, your steps look fine.
    
    For the records, I've updated&&tested the official documentation, for
    XenServer 6.5+ : https://github.com/apache/cloudstack-documentation/pull/140
     /
    https://acs-www.shapeblue.com/docs/WIP-PROOFING/pr140/installguide/hypervisor/xenserver.html#upgrading-xenserver-versions
    -
    i.e. removed unneeded steps and explained what each script is doing. This
    guide assumes a much longer management plane downtime, as the cluster is
    unmanaged while you update all the hosts in the pool. Works fine also for
    XCP-ng upgrades, etc.
    
    Either way, I prefer doing it based on the plan you laid out here.
    
    Regards,
    Andrija
    
    On Fri, 19 Jun 2020 at 23:24, David Merrill <david.merrill@otelco.com>
    wrote:
    
    > Hi All,
    >
    > I have a production deployment of ACS managing three XenServer Clusters
    > (XenServer pools of 6 hosts each) in two different Zones. I now find myself
    > in the position of needing to do a major version upgrade of those hosts.
    > Happily I have a ACS lab managing a XenServer cluster running the same
    > (old) version of XenServer that I can practice on.
    >
    > I have plenty of practice operating ACS to “quiesce things” for XenServer
    > patches (start with the pool master, move guest VMs off, put that host into
    > maintenance mode, unmanage the cluster, patch the host, then reverse & move
    > onto the next host with the same steps except we don’t bother
    > w/un-managing/re-managing the cluster), but as I understand a XenServer
    > version upgrade backs up the whole original XenServer installation to
    > another partition and makes a clean installation of XenServer on the
    > original partition (the problem there being that when the upgraded
    > XenServer boots up all the ACS provided/copied scripts are not there & ACS
    > can’t manage the host).
    >
    > So not much of an ask here (OK maybe at the end – have I missed something
    > obvious or doing anything foolish?), I wanted to share a bit research & lay
    > out a set of steps that I think will work to get a pool of XenServers in a
    > cluster upgraded and end up in a place where ACS is happy with them.
    >
    > Bear with me it’s a little long,
    >
    >
    >   1.  In XenCenter – if HA is enabled for the XenServer pool, disable it
    >   2.  Stop ACS management/usage services
    >   3.  Do MySQL database backups
    >   4.  Start ACS management/usage services
    >   5.  Start with the pool master.
    >   6.  In ACS – Migrate all guest VMs to other hosts in the cluster
    >   7.  In ACS – Prepare to put the pool master into maintenance mode (so no
    > new guest VMs)
    >      *   A caveat here related to this item I found when researching –
    > https://www.shapeblue.com/how-to-upgrade-an-apache-cloudstack-citrix-xenserver-cluster/
    >
    >                                                                i.      A
    > recommendation is made here to edit
    > /etc/cloudstack/management/environment.properties
    >
    >                                                              ii.      And
    > set manage.xenserver.pool.master=false
    >
    >                                                            iii.      And
    > restart CloudStack management services
    >
    >                                                            iv.
    > BECAUSE if one didn’t I understand CloudStack WOULD force an election for
    > another host to become the pool master (which is “bad” as ASCs is
    > configured to speak to the currently configured pool master)
    >
    >      *   HOWEVER THIS MAY NOT BE NECESSARY
    >
    >                                                                i.
    > Found a thread titled “A Story of a failed XenServer Upgrade” here –
    > http://mail-archives.apache.org/mod_mbox/cloudstack-users/201601.mbox/browser
    >
    >                                                              ii.      At
    > the end of the thread Paul Angus states that Geoff’s ShapeBlue blog article
    > was written in the ACS 4.3 era and that ACS’ behavior “used to be that
    > putting a host that was the pool master into maintenance would cause
    > CloudStack to force an election for another host to become pool master -
    > stopping you from then upgrading the active pool master first. There wasn't
    > an 'unmanage' button at the time.”
    >
    >                                                            iii.      The
    > implication, (in my humble estimation) is that, today, one no longer needs
    > to make these edits to /etc/cloudstack/management/environment.properties
    >
    >   1.  In ACS – Put the pool master into maintenance mode (so no new guest
    > VMs)
    >   2.  In ACS – Un-manage the cluster
    >   3.  NOW – Upgrade the XenServer pool master to the latest release
    >      *   Exercise left to the reader…(I’ll share what I end up doing)
    >   4.  In XenServer – Do the following (found this nugget in a thread last
    > November about XenServer upgrades & how to re-setup the host – thanks
    > Richard Lawley!)
    >      *   Remove this host tag: xe host-param-remove uuid=HOSTUUID
    > param-name=tags
    > param-key=vmops-version-com.cloud.hypervisor.xenserver.resource.XenServer650R
    >      *   This makes management server set the host back up, presumably
    > since ACS has credentials to the host in the database it can copy all the
    > scripts back
    >   5.  In ACS – Re-manage the cluster
    >   6.  In ACS – Exit maintenance-mode for the newly upgraded host
    >   7.  In ACS – Observe that the newly upgraded host is “Enabled” and “Up”
    > in the UI (Infrastructure --> Hosts)
    >   8.  In ACS – Testing (e.g. move an existing router/VM to the upgraded
    > host, create new networks/VMs on the upgraded host)
    >   9.  Rinse & repeat with the remaining XenServer pool members in the ACS
    > cluster.
    >      *   WITH THIS EXCEPTION: No need to manipulate management of the
    > cluster in ACS
    >   10. In XenCenter – if HA is required re-enable it
    >
    > Now all of this completely bypasses steps that are spelled out here (which
    > I *suspect* might now be “old”?):
    >
    >
    >   *
    > http://docs.cloudstack.apache.org/en/latest/installguide/hypervisor/xenserver.html#upgrading-xenserver-versions
    >
    > which asks one to run a lot of scripts (cleaning VLANs, preparing for
    > upgrade etc.) in addition to copying files from the management server to
    > the XenServer host (to set it back up again for ACS). I’m really hoping
    > that step 11 saves me from that.
    >
    > So (asks after all):
    >
    >
    >   1.  Is this a reasonable/viable plan?
    >   2.  Is my take on step 7 correct?
    >
    > Thanks for taking a look,
    > David
    >
    > David Merrill
    > Senior Systems Engineer,
    > Managed and Private/Hybrid Cloud Services
    > OTELCO
    > 92 Oak Street, Portland ME 04101
    > office 207.772.5678<callto:207.772.5678>
    > http://www.otelco.com/cloud-and-managed-services
    >
    > Confidentiality Message
    > The information contained in this e-mail transmission may be confidential
    > and legally privileged. If you are not the intended recipient, you are
    > notified that any dissemination, distribution, copying or other use of this
    > information, including attachments, is prohibited. If you received this
    > message in error, please call me at 207.772.5678<callto:207.772.5678> so
    > this error can be corrected.
    >
    >
    
    -- 
    
    Andrija Panić
    


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