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Hi team, We are transitioning from terraform to pulumi for some of our workload but we are stuck try...
# general
a
Hi team, We are transitioning from terraform to pulumi for some of our workload but we are stuck trying to get nodes running for a nodegroup. We want to taint those nodes ultimately.
Copy code
nodes, err := v1.GetNodeList(ctx, "allnodes", nil, nil, pulumi.Provider(n.KubernetesProvider))
	if err != nil {
		fmt.Printf("failed to get NODE LIST: %w", err)
		return err
	}

	nodes.Items.ApplyT(func(items []v1.Node) error {
		for _, node := range items {
			pulumi.Printf("Node Name: %s\n", node.Metadata.Name)
		}
		return nil
	})
Above is code i am trying but unsuccessful. Any help would be appreciated . Thanks!
m
What exactly does "unsuccessful" mean? What do you want to achieve (probably not printing node names 😉), and what does the code do instead?
a
Ultimately, I want to taint the running nodes of a nodegroup. In this code i am trying to list nodes to see if it works.
Currently this gives error 
resource ID is required for lookup and cannot be empty
m
Where does 
v1.GetNodeList
come from? I can't find it in the Pulumi docs or code.
a
Copy code
"<http://github.com/pulumi/pulumi-kubernetes/sdk/v4/go/kubernetes/core/v1|github.com/pulumi/pulumi-kubernetes/sdk/v4/go/kubernetes/core/v1>"
Copy code
package main

import (
	"<http://github.com/pulumi/pulumi-kubernetes/sdk/v4/go/kubernetes/core/v1|github.com/pulumi/pulumi-kubernetes/sdk/v4/go/kubernetes/core/v1>"
	"<http://github.com/pulumi/pulumi/sdk/v3/go/pulumi|github.com/pulumi/pulumi/sdk/v3/go/pulumi>"
)

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		// Lookup the NodeList
		nodeList, err := v1.GetNodeList(ctx, &v1.GetNodeListArgs{})
		if err != nil {
			return err
		}

		// Export the nodes' names
		for _, node := range nodeList.Items {
			ctx.Export("nodeName", pulumi.String(node.Metadata.Name))
		}

		return nil
	})
}
This is the code generated by pulumi AI
m
Ah, I see. For some reason, GitHub code search didn't find it.
a
I also couldn’t find it in the docs. But pulumi AI gives it
m
a
Yeah. So how do i fetch list of nodes of a nodegroup
m
Do you just need the names of the nodes? Or are you looking to import the nodes as resources into your Pulumi state? How are you going to taint the nodes?
a
So in terraform we fetch nodes for a nodegroup using 
data "kubernetes_nodes"
and passing nodegroup as the label after which we apply taint to those nodes using 
resource "kubernetes_node_taint"
I wanted something similar if possible
m
TF's 
data
is similar to Pulumi's 
Get...
, it gives you access to a read-only resource representation.
I'm not sure if there's an equivalent to 
kubernetes_nodes
and 
kubernetes_node_taint
in the Pulumi Kubernetes provider. As far as I know, these do not directly correspond to Kubernetes resources.
If you get a node via 
GetNode
, you cannot modify it (just like you cannot modify a TF 
data
object).
a
Does 
GetNode
works? Like if i pass nodegroup name as the parameter or match label it gives nodes?
m
Great that you found that, this looks like what you need.
GetNode
is equivalent to 
data "kubernetes_node"
, so it will give you a specific node resource but you have to know its name
a
Yeah but is there any way to get list of nodes running in kubernetes cluster or maybe get nodes running for an nodegroup
m
You can use the Kubernetes SDK to look up the node information in your Pulumi program.
GetNode
only works if you know the name of the node already.
a
yeah looks like thats the way to go . I will check out kubernetes SDK
m
Some Pulumi packages have convenience functions that wrap a client or SDK to look up information, but it doesn't look like the Kubernetes package does.
a
Yeah for AWS package there are few but couldn’t find for kubernetes
Maybe we should have one for this(fetch nodes of a nodegroup).👀
m
Yes, I agree that some utilities would be nice. Perhaps even a "give me a list of resources X in namespace Y" for all patchable resource types.
a
Agreed! FYI @big-piano-35669
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