I am trying to list all the nodes that are set to unscheduleable in an operator-sdk operator. Generally (pre 1.12) this means they have spec.unscheduleable set. So I tried this:
nodes := &corev1.NodeList{}
opts := &client.ListOptions{}
if err := opts.SetFieldSelector("spec.unschedulable=true"); err != nil {
reqLogger.Info("Failed to set field selector")
}
Which is erroring:
2019-04-23T10:19:39.761-0700 ERROR kubebuilder.controller Reconciler error {"controller": "node-controller", "request": "/nodename", "error": "Index with name field:spec.unschedulable does not exist"}I'm confused about this because the field selector works from kubectl:
kubectl get nodes --field-selector="spec.unschedulable=true"Alongside this issue, I have noticed that after v1.12, the spec.unscheduleable field has been deprecated in favour of TaintNodeByCondition. This further complicates things, because now I really don't think I can use the fieldselector anyone, because I don't believe (unless I'm mistaken?) that you can use fieldselector with the taints anyway.
So, my question is - how can I list all of the tainted/unscheduleable nodes in my cluster efficiently, specifically when using the operator-sdk
UPDATE:
I have managed to solve the fieldselector problem by using a v1meta.ListOptions call, like so:
nodes := &corev1.NodeList{}
opts := &client.ListOptions{
Raw: &metav1.ListOptions{
FieldSelector: "spec.unschedulable=true",
},
}
However, I still don't know how to do this with taints, so I've edited the question and will leave it open
According to the Controller Runtime docs, using raw options won't work well with the cache.
Instead you should add the desired fields to the index during controller initialization:
idx := myManager.GetFieldIndexer()
idx.IndexField(&corev1.Node{}, "spec.unschedulable", func(o runtime.Object) []string {
return []string{fmt.Sprintf("%v", o.(*corev1.Node).Spec.Unschedulable)}
})
I don't know if this can help you with the Operator SDK though.