Control plane node without taints from machineconfig

[paucampana]

Hello,

I am trying to create a single node cluster (just a control-plane, without workers). I would like to be able to run pods there. I have seen that in order to achieve it, I need to:

1. set the machineconfig.controlplane.scheduler.disabled to false in the control plane machineconfig
2. Delete the taints from the node.

I see in the documentation that Control plane nodes are tainted by default to prevent workloads from being scheduled to control plane nodes.

I would like to know if there is any options to set in the machineconfig to create the node without the Taints

Thanks!!

[frezbo]

you'd only need to set .cluster.allowSchedulingOnControlPlanes to true. This would bring up the machine with the control plane nodes without taints.

Scheduler should not be disabled.

[larrywalters]

@smira Thanks for the insight, and good to know that the taint has changed. I'm still on 1.1.1. I tried adding the allowSchedulingOnControlPlanes item to the machine configuration applied on cluster start, and removing my kubectl taint ... command, but I still get an error and the containers don't start.
In my machine config patch:

	{
		"op": "add",
		"path": "/cluster/allowSchedulingOnControlPlanes",
		"value": true
	}

Error from kubectl describe ...

  Warning  FailedScheduling  9s     default-scheduler  0/2 nodes are available: 1 node(s) had untolerated taint {node-role.kubernetes.io/master: }, 1 node(s) had volume node affinity conflict. preemption: 0/2 nodes are available: 2 Preemption is not helpful for scheduling.

Am I doing something wrong?

[frezbo]

allowSchedulingOnControlPlanes is only supported on talos 1.2.0 and later

[smira]

in 1.1.x it was called allowSchedulingOnMasters, you can use config reference on talos.dev for a specific version of Talos to figure out the available settings

[frezbo]

the old option is allowSchedulingOnMasters

[larrywalters]

Ah, thank you @smira @frezbo! Understood. I have adjusted my script to use the proper value depending on the version.