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Pacemaker Elastic IP on Equinix Metal

This project adds Equinix Metal Elastic IP address support to Pacemaker.

Demo:

asciicast

Getting started

For each machine you want to participate in Pacemaker:

  • Install jq and crudini

apt install -y jq crudini

  • Create the folder /usr/lib/ocf/resource.d/equinix/

  • Copy equinix-elastic-ip and equinix-elastic-ip-public to /usr/lib/ocf/resource.d/equinix/

Set up a file /etc/ansible/facts.d/uuid.fact as such:

[default]
equinix_uuid=this-is-not-a-real-uuid
equinix_project=this-is-not-a-real-project
equinix_token=this-is-not-a-real-token

where equinix_uuid is the UUID of the machine in question (this is necessary to be able to move the IP to it)

equinix_project is the UUID of the project that machine lives in (to be able to find IP assignments)

and equinix_token is a valid token with read/write scope for your Equinix Metal account.

Using the resource agent

This resource is best used in combination with the ocf:heartbeat:IPaddr2 resource agent.

This agent will handle moving the elastic IP between machines in the API, while the ocf:heartbeat:IPaddr2 will handle adding the IP itself to an interface on whichever machine you failover to.

Public Elastic IP

Create an ocf:heartbeat:IPaddr2 resource (replace ip with your chosen IP, bond0 with the interface it should live on):

pcs resource create virtual_ip_public ocf:heartbeat:IPaddr2 ip=198.70.197.254 cidr_netmask=32 nic=bond0

Create the Equinix Metal Elastic IP resource, replacing 198.70.197.254 with your chosen IP.

pcs resource create elastic_ip_metal_public ocf:equinix:equinix-elastic-ip-public ip=198.70.197.254

Create a colocation rule that says they must always "live together"

pcs constraint colocation add virtual_ip_public with elastic_ip_metal_public INFINITY

Private Elastic IP

Create an ocf:heartbeat:IPaddr2 resource (replace ip with your chosen IP, bond0 with the interface it should live on):

pcs resource create virtual_ip ocf:heartbeat:IPaddr2 ip=10.20.30.254 cidr_netmask=32 nic=bond0

Create the Equinix Metal Elastic IP resource, replacing 10.20.30.254 with your chosen IP and "10.20.30.128" with your chosen subnet.

pcs resource create elastic_ip_metal ocf:equinix:equinix-elastic-ip ip=10.20.30.254 subnet=10.20.30.128

Create a colocation rule that says they must always "live together"

pcs constraint colocation add virtual_ip with elastic_ip_metal INFINITY

Operation

Once you've installed the resource agents, added your configuration and created all the required resources, run pcs status. You should see something like this:

root@db-staging-lb01:~# pcs status
Cluster name: db-loadbalancer
Cluster Summary:
  * Stack: corosync
  * Current DC: db-staging-lb03 (version 2.1.2-ada5c3b36e2) - partition with quorum
  * Last updated: Mon Nov 28 05:26:40 2022
  * Last change:  Mon Nov 28 04:54:58 2022 by hacluster via crmd on db-staging-lb01
  * 3 nodes configured
  * 5 resource instances configured

Node List:
  * Online: [ db-staging-lb01 db-staging-lb02 db-staging-lb03 ]

Full List of Resources:
  * virtual_ip  (ocf:heartbeat:IPaddr2):         Started db-staging-lb01
  * Clone Set: loadbalancer-clone [loadbalancer]:
    * Started: [ db-staging-lb01 db-staging-lb02 db-staging-lb03 ]
  * elastic_ip_metal    (ocf:equinix:equinix-floating-ip):       Started db-staging-lb01

Daemon Status:
  corosync: active/enabled
  pacemaker: active/enabled
  pcsd: active/enabled

If you see a virtual_ip resource, and an elastic_ip_metal resource (or the public equivalents thereof) started on the same machine, and traffic is flowing, congratulations, you've set up a HA cluster on Equinix Metal! Try rebooting the active machine while pinging the elastic IP and see what happens - failover should happen within 4-12 seconds. Enjoy!

Credits and License

Copyright (c) 2022 Benjamin Arntzen & Protocol Labs, licensed under the GNU General Public License v2.

Based on code of Markus Guertler and Mathieu GRZYBEK.