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Kubernetes Terraform Provider
The k8s Terraform provider enables Terraform to deploy Kubernetes resources. Unlike the official Kubernetes provider it handles raw manifests, leveraging kubectl
directly to allow developers to work with any Kubernetes resource natively.
Usage
Use go get
to install the provider:
go get -u github.com/ericchiang/terraform-provider-k8s
Register the plugin in ~/.terraformrc
:
providers {
k8s = "/$GOPATH/bin/terraform-provider-k8s"
}
The provider takes the following optional configuration parameters:
- If you have a kubeconfig available on the file system you can configure the provider as:
provider "k8s" {
kubeconfig = "/path/to/kubeconfig"
}
- If you content of the kubeconfig is available in a variable, you can configure the provider as:
provider "k8s" {
kubeconfig_content = "${var.kubeconfig}"
}
WARNING: Configuration from the variable will be recorded into a temporary file and the file will be removed as soon as call is completed. This may impact performance if the code runs on a shared system because and the global tempdir is used.
The k8s Terraform provider introduces a single Terraform resource, a k8s_manifest
. The resource contains a content
field, which contains a raw manifest.
variable "replicas" {
type = "string"
default = 3
}
data "template_file" "nginx-deployment" {
template = "${file("manifests/nginx-deployment.yaml")}"
vars {
replicas = "${var.replicas}"
}
}
resource "k8s_manifest" "nginx-deployment" {
content = "${data.template_file.nginx-deployment.rendered}"
}
In this case manifests/nginx-deployment.yaml
is a templated deployment manifest.
apiVersion: apps/v1beta2
kind: Deployment
metadata:
name: nginx-deployment
labels:
app: nginx
spec:
replicas: ${replicas}
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.7.9
ports:
- containerPort: 80
The Kubernetes resources can then be managed through Terraform.
$ terraform apply
# ...
Apply complete! Resources: 1 added, 1 changed, 0 destroyed.
$ kubectl get deployments
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx-deployment 3 3 3 3 1m
$ terraform apply -var 'replicas=5'
# ...
Apply complete! Resources: 0 added, 1 changed, 0 destroyed.
$ kubectl get deployments
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx-deployment 5 5 5 3 3m
$ terraform destroy -force
# ...
Destroy complete! Resources: 2 destroyed.
$ kubectl get deployments
No resources found.