> On 2 Oct 2019, at 13:29, Vrgotic, Marko <m.vrgo...@activevideo.com> wrote:
>
> Any ideas
>
> From: "Vrgotic, Marko" <m.vrgo...@activevideo.com>
> Date: Friday, 27 September 2019 at 17:26
> To: "users@ovirt.org" <users@ovirt.org>
> Subject: How to pass parameters between VDSM Hooks domxml in single run
>
> Dear oVIrt,
>
> A while ago we discussed on ways to change/update content of parameters of
> domxml in certain action.
>
> As I mentioned before, we have added the VDSMHook 60_nsupdate which removes
> the DNS record entries when a VM is destroyed:
>
> …
> domxml = hooking.read_domxml()
> name = domxml.getElementsByTagName('name')[0]
> name = " ".join(name.nodeValue for name in name.childNodes if
> name.nodeType == name.TEXT_NODE)
> nsupdate_commands = """server {server_ip}
> update delete {vm_name}.example.com a
> update delete {vm_name}. example.com aaaa
> update delete {vm_name}. example.com txt
> send
> """.format(server_ip="172.16.1.10", vm_name=name)
> …
>
> The goal:
> However, we did not want to execute remove dns records when VM is only
> migrated. Since its considered a “destroy” action we took following approach.
> • In state “before_vm_migrate_source add hook which will write flag
> “is_migration” to domxml
> • Once VM is scheduled for migration, this hook should add the flag
> “is_migration” to domxml
> • Once 60_nsupdate is triggered, it will check for the flag and if
> there, skip executing dns record action, but only remove the flag
> “is_migration” from domxml of the VM
>
> …
> domxml = hooking.read_domxml()
> migration = domxml.createElement("is_migration")
> domxml.getElementsByTagName("domain")[0].appendChild(migration)
> logging.info("domxml_updated {}".format(domxml.toprettyxml()))
> hooking.write_domxml(domxml)
> …
>
> When executing first time, we observed that flag “
>
> <name>hookiesvm</name>
> <uuid>fcfa66cb-b251-43a3-8e2b-f33b3024a749</uuid>
> <metadata xmlns:ns0="http://ovirt.org/vm/tune/1.0";
> xmlns:ns1="http://ovirt.org/vm/1.0";>
> <ns0:qos/>
> <ovirt-vm:vm xmlns:ovirt-vm="http://ovirt.org/vm/1.0";>
> <ovirt-vm:clusterVersion>4.3</ovirt-vm:clusterVersion>
> <ovirt-vm:destroy_on_reboot
> type="bool">False</ovirt-vm:destroy_on_reboot>
> <ovirt-vm:launchPaused>false</ovirt-vm:launchPaused>
> <ovirt-vm:memGuaranteedSize
> type="int">1024</ovirt-vm:memGuaranteedSize>
> <ovirt-vm:minGuaranteedMemoryMb
> type="int">1024</ovirt-vm:minGuaranteedMemoryMb>
> ...skipping...
> <address bus="0x00" domain="0x0000" function="0x0"
> slot="0x09" type="pci"/>
> </rng>
> </devices>
> <seclabel model="selinux" relabel="yes" type="dynamic">
> <label>system_u:system_r:svirt_t:s0:c169,c575</label>
>
> <imagelabel>system_u:object_r:svirt_image_t:s0:c169,c575</imagelabel>
> </seclabel>
> <seclabel model="dac" relabel="yes" type="dynamic">
> <label>+107:+107</label>
> <imagelabel>+107:+107</imagelabel>
> </seclabel>
> <is_migration/>
you can’t just add a random tag into libvirt xml in a random place, it will be
dropped by libvirt.
you can add it to metadata though. we use that for ovirt-specific information
> </domain>
> is added to domxml, but was present once 60_nsupdate hook was executed.
>
> The question: How do we make sure that, when domxml is updated, that the
> update is visible/usable by following hook, in single run? How to pass these
> changes between hooks?
>
> Kindly awaiting your reply.
>
>
> — — —
> Met vriendelijke groet / Kind regards,
>
> Marko Vrgotic
>
>
> _______________________________________________
> Users mailing list -- users@ovirt.org
> To unsubscribe send an email to users-le...@ovirt.org
> Privacy Statement: https://www.ovirt.org/site/privacy-policy/
> oVirt Code of Conduct:
> https://www.ovirt.org/community/about/community-guidelines/
> List Archives:
> https://lists.ovirt.org/archives/list/users@ovirt.org/message/IC4J6CAJUQOSLU3ZJPX3ZHTUM4HUCMGU/
_______________________________________________
Users mailing list -- users@ovirt.org
To unsubscribe send an email to users-le...@ovirt.org
Privacy Statement: https://www.ovirt.org/site/privacy-policy/
oVirt Code of Conduct:
https://www.ovirt.org/community/about/community-guidelines/
List Archives:
https://lists.ovirt.org/archives/list/users@ovirt.org/message/MHQ4VQ4IXO6GM5MOGQSHAX74SCP2QUJD/
