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<p class="MsoNormal"><span style="font-size:11.0pt">( I have been having a discussion with Adam Spiers on [openstack-dev][vitrage][nova] on this topic ... thought I would switchover to [masakari] )<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">I am interested in contributing an implementation of Intrusive Instance Monitoring,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">initially specifically VM Heartbeat / Heath-check Monitoring thru the QEMU Guest Agent (<a href="https://wiki.libvirt.org/page/Qemu_guest_agent)">https://wiki.libvirt.org/page/Qemu_guest_agent)</a>.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><i><span style="font-size:11.0pt">I’d like to know whether Masakari project leaders would consider a blueprint on “VM Heartbeat / Health-check Monitoring”.<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><span style="font-size:11.0pt">See below for some more details,<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>
<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;color:black">VM Heartbeating / Health-check Monitoring would introduce intrusive / white-box type monitoring of VMs / Instances to Masakari.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Briefly, “<u>VM Heartbeat / Health-check Monitoring</u>”</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt;text-indent:-18.0pt"><span style="font-size:11.0pt;color:black">·</span><span style="font-size:7.0pt;font-family:"Times New Roman";color:black"> </span><span style="font-size:11.0pt;color:black">is optionally
enabled thru a Nova flavor extra-spec,</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt;text-indent:-18.0pt"><span style="font-size:11.0pt;color:black">·</span><span style="font-size:7.0pt;font-family:"Times New Roman";color:black"> </span><span style="font-size:11.0pt;color:black">is a service
that runs on an OpenStack Compute Node,</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt;text-indent:-18.0pt"><span style="font-size:11.0pt;color:black">·</span><span style="font-size:7.0pt;font-family:"Times New Roman";color:black"> </span><span style="font-size:11.0pt;color:black">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,<br>
( <a href="https://wiki.libvirt.org/page/Qemu_guest_agent">https://wiki.libvirt.org/page/Qemu_guest_agent</a> )</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt;text-indent:-18.0pt"><span style="font-size:11.0pt;color:black">·</span><span style="font-size:7.0pt;font-family:"Times New Roman";color:black"> </span><span style="font-size:11.0pt;color:black">on loss
of heartbeat or a failed health check status will result in fault event, against the VM, being <br>
reported to Masakari and any other registered reporting backends like Mistral, or Vitrage.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">I realize this is somewhat in the gray-zone of what a cloud should be monitoring or not,</span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">but I believe it provides an alternative for Applications deployed in VMs that do not have an external monitoring/management entity like a VNF Manager in the MANO architecture.</span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">And even for VMs with VNF Managers, it provides a highly reliable alternate monitoring path that does not rely on Tenant Networking.</span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"> </span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">VM HB/HC Monitoring would leverage <a href="https://wiki.libvirt.org/page/Qemu_guest_agent"><span style="color:purple">https://wiki.libvirt.org/page/Qemu_guest_agent</span></a></span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">that would require the agent to be installed in the images for talking back to the compute host.</span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">( there are other examples of similar approaches in openstack ... the murano-agent for installation, the swift-agent for object store management )</span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Although here, in the case of VM HB/HC Monitoring, via the QEMU Guest Agent, the messaging path is internal thru a QEMU virtual serial device. i.e. a very simple interface with very few dependencies
... it’s up and available very early in VM lifecycle and virtually always up.</span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"> </span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Wrt failure modes / use-cases</span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt;text-indent:-18.0pt"><span style="font-size:11.0pt;font-family:"Times New Roman";color:black">·</span><span style="font-size:7.0pt;font-family:"Times New Roman";color:black"> </span><span style="font-size:11.0pt;color:black">a
VM’s response to a Heartbeat Challenge Request can be as simple as just ACK-ing,<br>
this alone allows for detection of:</span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt"><span style="font-size:11.0pt;font-family:"Courier New";color:black">o</span><span style="font-size:7.0pt;font-family:"Times New Roman";color:black"> </span><span style="font-size:11.0pt;color:black">a
failed or hung QEMU/KVM instance, or</span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt"><span style="font-size:11.0pt;font-family:"Courier New";color:black">o</span><span style="font-size:7.0pt;font-family:"Times New Roman";color:black"> </span><span style="font-size:11.0pt;color:black">a
failed or hung VM’s OS, or</span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt"><span style="font-size:11.0pt;font-family:"Courier New";color:black">o</span><span style="font-size:7.0pt;font-family:"Times New Roman";color:black"> </span><span style="font-size:11.0pt;color:black">a
failure of the VM’s OS to schedule the QEMU Guest Agent daemon, or</span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt"><span style="font-size:11.0pt;font-family:"Courier New";color:black">o</span><span style="font-size:7.0pt;font-family:"Times New Roman";color:black"> </span><span style="font-size:11.0pt;color:black">a
failure of the VM to route basic IO via linux sockets.</span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt;text-indent:-18.0pt"><span style="font-size:11.0pt;font-family:"Times New Roman";color:black">·</span><span style="font-size:7.0pt;font-family:"Times New Roman";color:black"> </span><span style="font-size:11.0pt;color:black">I
have had feedback that this is similar to the virtual hardware watchdog of QEMU/KVM (<a href="https://libvirt.org/formatdomain.html#elementsWatchdog"><span style="color:purple">https://libvirt.org/formatdomain.html#elementsWatchdog</span></a> )</span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt;text-indent:-18.0pt"><span style="font-family:"Times New Roman";color:black">·</span><span style="font-size:7.0pt;font-family:"Times New Roman";color:black"> </span><span style="font-size:11.0pt;color:black">However,
the VM Heartbeat / Health-check Monitoring</span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt"><span style="font-family:"Courier New";color:black">o</span><span style="font-size:7.0pt;font-family:"Times New Roman";color:black"> </span><span style="font-size:11.0pt;color:black">provides
a higher-level (i.e. application-level) heartbeating</span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:108.0pt;text-indent:-18.0pt"><span style="font-family:Wingdings;color:black">§</span><span style="font-size:7.0pt;font-family:"Times New Roman";color:black"> </span><span style="font-size:11.0pt;color:black">i.e. if
the Heartbeat requests are being answered by the Application running within the VM</span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt"><span style="font-family:"Courier New";color:black">o</span><span style="font-size:7.0pt;font-family:"Times New Roman";color:black"> </span><span style="font-size:11.0pt;color:black">provides
more than just heartbeating, as the Application can use it to trigger a variety of audits,</span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt"><span style="font-family:"Courier New";color:black">o</span><span style="font-size:7.0pt;font-family:"Times New Roman";color:black"> </span><span style="font-size:11.0pt;color:black">provides
a mechanism for the Application within the VM to report a Health Status / Info back to the Host / Cloud,</span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt"><span style="font-family:"Courier New";color:black">o</span><span style="font-size:7.0pt;font-family:"Times New Roman";color:black"> </span><span style="font-size:11.0pt;color:black">provides
notification of the Heartbeat / Health-check status to higher-level cloud entities thru Masakari, Mistral and/or Vitrage</span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:108.0pt;text-indent:-18.0pt"><span style="font-family:Wingdings;color:black">§</span><span style="font-size:7.0pt;font-family:"Times New Roman";color:black"> </span><span style="font-size:11.0pt;color:black">e.g. VM-Heartbeat-Monitor
- to - Vitrage - (EventAlarm) - Aodh - ... - VNF-Manager<br>
- (StateChange) - Nova - ... - VNF Manager</span><span style="font-family:"Times New Roman";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman";color:black"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman";color:black">NOTE: perhaps the reporting to Vitrage would be a separate blueprint within Masakari.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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