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Portal:Cloud VPS/Admin/Runbooks/NodeDownForLong

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Overview

The procedures in this runbook require admin permissions to complete.

Error / Incident

A node has been offline (considered down) by a long period of time.

Debugging

This is quite a generic alert, so there's many options, but some things to try:

Common issues

Cloudvirt down

If the host being unresponsive is a cloudvirt host, it will trigger a page. You should add it to the "maintenance" aggregate to prevent new VMs being scheduled on that host, and drain the host evacuating all VMs to other hosts.

There is a cookbook wmcs.openstack.cloudvirt.drain, but it does not work if the host is unreachable, tracked in phab:T375223.

Example:

root@cloudcontrol1005:~# openstack aggregate add host maintenance cloudvirt1063

# take note of the status of all VMs (ACTIVE, SHUTOFF, PAUSED), as you'll have to manually restore it after the VM is moved to another host
root@cloudcontrol1005:~# openstack server list --host cloudvirt1063 --all-projects

# the value for os-password can be found in /etc/novaadmin.yaml
root@cloudcontrol1005:~# nova --os-username novaadmin --os-project-name admin --os-auth-url "https://openstack.eqiad1.wikimediacloud.org:25357/v3" --os-password XXXXXX --os-user-domain-id default host-evacuate cloudvirt1063
nova CLI is deprecated and will be removed in a future release

+--------------------------------------+-------------------+---------------+
| Server UUID                          | Evacuate Accepted | Error Message |
+--------------------------------------+-------------------+---------------+
| 3585384e-e85f-41da-a014-448c59d76586 | True              |               |
| abaa359b-3468-4b56-be7c-24dc88252c9e | True              |               |
| 5899163e-bbfb-474e-8a9a-2dae5006de22 | True              |               |
| f9015696-9010-4a1c-a7cf-9bc8e8098df4 | True              |               |
| 15700b39-5773-4fec-9349-47f16bc457bd | True              |               |
| b615abe0-9cc2-4cee-a224-c1f0b90e7957 | True              |               |
| 20f22f9d-5734-49b9-8a19-9908e588c92f | True              |               |
| 1b0a01e4-e8cb-4a68-ad6c-306b9869db05 | True              |               |
| 3192a8d0-0fda-4d24-a1b7-2e2dc20fbe0e | True              |               |
+--------------------------------------+-------------------+---------------+

# restart VMs that were in ACTIVE status with:
root@cloudcontrol1005:~# openstack server start <id>
Remember to manually resolve the alert in VictorOps, otherwise it will fire again after 24 hours.

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