new data type: tunnel (port forward)

[geektheripper]

Description

tunnel forward local port to specific kubernetes resource, like what kubectl port-forward do

it helps users to access services inside kubernetes, such as databases

Potential Terraform Configuration

data "kubernetes_tunnel" "postgresql" {
  namespace = "database"
  resource  = "deployment/postgresql-deployment"
  port      = 5432
}

provider "postgresql" {
  host = data.kubernetes_tunnel.postgresql.localhost
  port = data.kubernetes_tunnel.postgresql.localport
  # ......
}

data "kubernetes_tunnel" "minio" {
  namespace = "storage"
  resource  = "service/minio-service"
  port      = "http"
}

provider "minio" {
  minio_server = "${data.kubernetes_tunnel.minio.localhost}:${data.kubernetes_tunnel.minio.localport}"
  # ......
}

resource "minio_s3_bucket" "bililive_rec" {
  bucket = "bililive-rec"
  acl    = "public-read"
  quota  = 109951162777600
}

References

https://github.com/kubernetes/kubectl/blob/master/pkg/cmd/portforward/portforward.go
https://github.com/flaupretre/terraform-ssh-tunnel

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[jrhouston]

Thanks for opening this @geektheripper. This is actually a duplicate of #812. Please see my comment on that issue thread on why a port-foward/tunnel can't be created inside this provider, and that this is a problem that should be solved upstream in terraform itself.