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<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt">Some other UPDATES on this proposal (from outside the mailing list):<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l3 level1 lfo7"><![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">this should probably be based on an ‘<u>image property’</u> rather than a ‘flavor extraspec’,<br>
since it requires code to be included in the guest/VM image,<br>
<br>
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l3 level1 lfo7"><![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">rather than use a unique virtio-serial link for the Heartbeat/Health-check Monitoring Messaging,
<br>
propose that we leverage the <u>existing</u> <a href="http://wiki.qemu.org/Features/GuestAgent">
http://wiki.qemu.org/Features/GuestAgent</a><o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l3 level2 lfo7">
<![if !supportLists]><span style="font-size:11.0pt;font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">NOVA already supports a ‘hw_qemu_guest_agent=True’ image property<br>
which results in NOVA setting up a virtio-serial connection to a QEMU Guest Agent<br>
within the Guest/VM,<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l3 level2 lfo7">
<![if !supportLists]><span style="font-size:11.0pt;font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">use this for the transport messaging layer for VM Heartbeating/Health-checking<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">With respect to ... where to propose / contribute this functionality,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Given that <o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l1 level1 lfo8"><![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">this may require very little work in NOVA (by using QEMU Guest Agent), and<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l1 level1 lfo8"><![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">the fact that the primary result of VM Heartbeating / Health-checking is to report per-instance HB/HC status to Vitrage,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I am thinking that this would fit better simply in Vitrage.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">An optional functionality enabled thru /etc/vitrage/vitrage.conf .<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Comments ?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Greg.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span style="color:black">From: </span></b><span style="color:black">Greg Waines <Greg.Waines@windriver.com><br>
<b>Reply-To: </b>"openstack-dev@lists.openstack.org" <openstack-dev@lists.openstack.org><br>
<b>Date: </b>Tuesday, May 9, 2017 at 1:11 PM<br>
<b>To: </b>"openstack-dev@lists.openstack.org" <openstack-dev@lists.openstack.org><br>
<b>Subject: </b>[openstack-dev] [vitrage] [nova] VM Heartbeat / Healthcheck Monitoring<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Times New Roman""><o:p> </o:p></span></p>
</div>
<p class="MsoNormal"><span style="font-size:11.0pt">I am looking for guidance on where to propose some “<u>VM Heartbeat / Health-check Monitoring</u>” functionality that I would like to contribute to openstack.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Briefly, “<u>VM Heartbeat / Health-check Monitoring</u>”</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l2 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">is optionally enabled thru a Nova flavor extra-spec,</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l2 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">is a service that runs on an OpenStack Compute Node,</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l2 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">it sends periodic Heartbeat / Health-check Challenge Requests to a VM<br>
over a virtio-serial-device setup between the Compute Node and the VM thru QEMU,</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l2 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">on loss of heartbeat or a failed health check status will result in fault event, against the VM, being
<br>
reported to Vitrage thru its data-source API.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Where should I contribute this functionality ?</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo4"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">put it ALL in Vitrage ... both the monitoring and the data-source reporting ?
</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo4"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">put the monitoring in Nova, and just the data source reporting in Vitrage ?</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo4"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">other ?</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Greg.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">p.s. other info ...</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Benefits of “VM Heartbeat / Health-check Monitoring”</span><span style="font-size:11.0pt;font-family:PMingLiU"><br>
</span><span style="font-size:11.0pt"><br>
<br>
</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l4 level1 lfo6"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">monitors health of OS and Applications INSIDE the VM</span><o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l4 level2 lfo6">
<![if !supportLists]><span style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">i.e. even just a simple Ack of the Heartbeat would validate that the OS is running, IO mechanisms (sockets, etc)<br>
are working and processes are getting scheduled</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l4 level1 lfo6"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">health-check status reporting can trigger and report on either high-level or detailed application-specific audits within the VM,<br>
<br>
<br>
</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l4 level1 lfo6"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">the simple virtio-serial-device interface thru QEMU is UP very early in VM life cycle and is virtually
<u>always up</u></span><o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l4 level2 lfo6">
<![if !supportLists]><span style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">i.e. its available for reporting issues virtually all the time,</span><o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l4 level2 lfo6">
<![if !supportLists]><span style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt"> ... 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 ...<br>
<br>
<br>
</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l4 level1 lfo6"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">uses a simple “Line-Delimited JSON” Format over virtio serial device (
<a href="http://www.linux-kvm.org/page/Virtio-serial_API">http://www.linux-kvm.org/page/Virtio-serial_API</a> )</span><o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l4 level2 lfo6">
<![if !supportLists]><span style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">simple to implement protocol inside VM, in pretty much any language</span><o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l4 level2 lfo6">
<![if !supportLists]><span style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">( although would provide reference implementation )<br>
<br>
<br>
</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l4 level1 lfo6"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">provides more thorough instance monitoring than libvirt’s emulated hardware watchdog (
<a href="https://libvirt.org/formatdomain.html#elementsWatchdog">https://libvirt.org/formatdomain.html#elementsWatchdog</a> )</span><o:p></o:p></p>
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