Unable to convert Yaml to terraform

[Prat0487]

Hi everyone,
I am getting below error while converting YAML to terraform.
Below is my manifest file link

https://github.com/kubernetes-sigs/aws-efs-csi-driver/blob/release-1.3/deploy/kubernetes/base/kustomization.yaml

I am getting below error for above manifest

panic: value is null
goroutine 1 [running]:
runtime/debug.Stack(0xc0000a7940, 0x5d4fe0, 0x64b250)
/usr/lib/golang/src/runtime/debug/stack.go:24 +0x9f
main.capturePanic()
/home/ec2-user/environment/yamtotf/tfk8s/tfk8s.go:234 +0x73
panic(0x5d4fe0, 0x64b250)
/usr/lib/golang/src/runtime/panic.go:969 +0x1b9
github.com/zclconf/go-cty/cty.Value.LengthInt(0x0, 0x0, 0x0, 0x0, 0xc000018d01)
/home/ec2-user/go/pkg/mod/github.com/zclconf/go-cty@v1.8.0/cty/value_ops.go:1058 +0x277
github.com/zclconf/go-cty/cty.Value.AsValueMap(0x0, 0x0, 0x0, 0x0, 0x78d4c0)
/home/ec2-user/go/pkg/mod/github.com/zclconf/go-cty@v1.8.0/cty/value_ops.go:1315 +0x95
main.yamlToHCL(0x652140, 0xc0000d2350, 0x5ddaa0, 0xc000073aa0, 0x0, 0x0, 0x0, 0x0, 0x652140, 0xc0000d2350, ...)
/home/ec2-user/environment/yamtotf/tfk8s/tfk8s.go:111 +0x2ea
main.YAMLToTerraformResources(0x64ee20, 0xc000010698, 0x0, 0x0, 0xc000000000, 0x0, 0x0, 0xc000018a9b, 0xc00004bbe0)
/home/ec2-user/environment/yamtotf/tfk8s/tfk8s.go:209 +0x41d
main.main()
/home/ec2-user/environment/yamtotf/tfk8s/tfk8s.go:267 +0x3c5

Please someone who can help me on this or convert above Yaml file to terraform?

[jrhouston]

Hi @Prat0487 that looks like a Kustomize YAML – this tool is only for converting the YAML for Kubernetes resources.

[Zamyatin]

Hi @Prat0487 I believe what you'd want to do (possibly, if this works for you) is use kustomize to build the manifest(s) for your deployment - node-daemonsets, serviceAccounts, etc... to an outputted yaml file.

This YAML you then feed into this tfk8s tool, which would create separate terraform resources for your various resources as defined in the kustomize output.

So:

1. kustomize build aws-efs-csi-driver/deploy/kubernetes/base > my_kube_manifests.yaml
2. cat my_kube_manifests.yaml | tfk8s > kubernetes_base.tf

... from here you would probably want to determine what are required (base) resources, then mix in some of those overlays as appropriate.

Basically, the difference is that Terraform is a templating tool, while Kustomize is a patching tool Victor Farcic covers these tooling types (using Helm as the templating tool in the comparison) in this video.

The same ends can be achieved, that is, getting your resources set up as desired for a given environment, allowing for differentiation between environments... it's just that patching YAML is clean but hard to validate until you push it and it breaks/gets rejected, while Terraform has some verifiability tooling to make sure the intended changes make sense (either through Terraform LSP + your code editor, or through terraform validate, though I can't confirm how well terraform validate will handle custom K8s manifests or K8s CRDs).

Anyway, out of curiosity I went through the process above and got what I believe you're looking for. :)