[openstack-dev] [vitrage] [nova] VM Heartbeat / Healthcheck Monitoring

Waines, Greg Greg.Waines at windriver.com
Tue May 9 17:11:14 UTC 2017

I am looking for guidance on where to propose some “VM Heartbeat / Health-check Monitoring” functionality that I would like to contribute to openstack.

Briefly, “VM Heartbeat / Health-check Monitoring”

·         is optionally enabled thru a Nova flavor extra-spec,

·         is a service that runs on an OpenStack Compute Node,

·         it sends periodic Heartbeat / Health-check Challenge Requests to a VM
over a virtio-serial-device setup between the Compute Node and the VM thru QEMU,

·         on loss of heartbeat or a failed health check status will result in fault event, against the VM, being
reported to Vitrage thru its data-source API.

Where should I contribute this functionality ?

·         put it ALL in Vitrage ... both the monitoring and the data-source reporting ?

·         put the monitoring in Nova, and just the data source reporting in Vitrage ?

·         other ?


p.s. other info ...

Benefits of “VM Heartbeat / Health-check Monitoring”

·         monitors health of OS and Applications INSIDE the VM

o    i.e. even just a simple Ack of the Heartbeat would validate that the OS is running, IO mechanisms (sockets, etc)
are working and processes are getting scheduled

·         health-check status reporting can trigger and report on either high-level or detailed application-specific audits within the VM,

·         the simple virtio-serial-device interface thru QEMU is UP very early in VM life cycle and is virtually always up

o    i.e. its available for reporting issues virtually all the time,

o           ... compared to reporting issues over Tenant Network to a remote VNFManager which relies on Ethernet and IP Networking within the VM itself and then any provider network and adjacent routers around the compute nodes ...

·         uses a simple “Line-Delimited JSON” Format over virtio serial device ( http://www.linux-kvm.org/page/Virtio-serial_API )

o    simple to implement protocol inside VM, in pretty much any language

o    ( although would provide reference implementation )

·         provides more thorough instance monitoring than libvirt’s emulated hardware watchdog ( https://libvirt.org/formatdomain.html#elementsWatchdog )
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