style="font-size:15px;"> variable "gce_key" {
default = "./kubernetes_key.json"
}
variable "node_count_zone" {
default = 1
}
They can be passed through the -var switch , for example: sudo ./terraform apply -var = "project_name = node-cluster-243923" .
essh @ kubernetes-master: ~ / node-cluster / Kubernetes $ cp ../kubernetes_key.json.
essh @ kubernetes-master: ~ / node-cluster / Kubernetes $ sudo ../terraform apply -var = "project_name = node-cluster-243923"
Our project in the folder is not only a project, but also a module ready to use:
essh @ kubernetes-master: ~ / node-cluster / Kubernetes $ cd ..
essh @ kubernetes-master: ~ / node-cluster $ cat main.tf
module "Kubernetes" {
source = "./Kubernetes"
project_name = "node-cluster-243923"
}
essh @ kubernetes-master: ~ / node-cluster $ sudo ./terraform apply
Or upload to the public repository:
essh @ kubernetes-master: ~ / node-cluster / Kubernetes $ git init
Initialized empty GIT repository in /home/essh/node-cluster/Kubernetes/.git/
essh @ kubernetes-master: ~ / node-cluster / Kubernetes $ echo "terraform.tfstate" >> .gitignore
essh @ kubernetes-master: ~ / node-cluster / Kubernetes $ echo "terraform.tfstate.backup" >> .gitignore
essh @ kubernetes-master: ~ / node-cluster / Kubernetes $ echo ".terraform /" >> .gitignore
essh @ kubernetes-master: ~ / node-cluster / Kubernetes $ rm -f kubernetes_key.json
essh @ kubernetes-master: ~ / node-cluster / Kubernetes $ git remote add origin https://github.com/ESSch/terraform-google-kubernetes.git
essh @ kubernetes-master: ~ / node-cluster / Kubernetes $ git add.
essh @ kubernetes-master: ~ / node-cluster / Kubernetes $ git commit -m 'create a k8s Terraform module'
[master (root-commit) 4f73c64] create a Kubernetes Terraform module
3 files changed, 48 insertions (+)
create mode 100644 .gitignore
create mode 100644 main.tf
create mode 100644 variables.tf
essh @ kubernetes-master: ~ / node-cluster / Kubernetes $ git push -u origin master
essh @ kubernetes-master: ~ / node-cluster / Kubernetes $ git tag -a v0.0.2 -m 'publish'
essh @ kubernetes-master: ~ / node-cluster / Kubernetes $ git push origin v0.0.2
After publishing in the module registry https://registry.terraform.io/, having met the requirements such as having a description, we can use it:
essh @ kubernetes-master: ~ / node-cluster $ cat main.tf
module "kubernetes" {
# source = "./Kubernetes"
source = "ESSch / kubernetes / google"
version = "0.0.2"
project_name = "node-cluster-243923"
}
essh @ kubernetes-master: ~ / node-cluster $ sudo ./terraform init
essh @ kubernetes-master: ~ / node-cluster $ sudo ./terraform apply
On the next creation of the cluster, I got the error ZONE_RESOURCE_POOL_EXHAUSTED "does not have enough resources available to fulfill the request. Try a different zone, or try again later" , indicating that there are no required servers in this region. For me this is not a problem and I do not need to edit the module's code, because I parameterized the module with the region, and if I just pass the region region = "europe-west2" to the module as a parameter , terraform after the update and initialization command ./terrafrom init and the application command ./terraform apply will transfer my cluster to the specified region. Let's improve our module a little by moving the provider from the Kubernetes child module to the main module (the main script is also a module). Having brought it to the main module, we will be able to use one more module, otherwise the provider in one module will conflict with the provider in another. Inheritance from main module to child modules and their transparency applies only to providers. The rest of the data for transferring from child to parent will have to use external variables, and from parent to child – to parameterize the parent, but this is later, when we will create another model. Also, moving the provider to the parent module will be useful when creating the next module that we will create, since it will create Kubernetes elements that do not depend on the provider, and thus we can untie the Google provider from our module and can be used with other providers supporting Kubernetes. Now we don't need to pass the project name in the variable – it is set in the provider. For the convenience of development, I will use the local connection of the module for now. I created a folder and file for a new module:
essh @ kubernetes-master: ~ / node-cluster $ ls nodejs /
main.tf
essh @ kubernetes-master: ~ / node-cluster $ cat main.tf
// module "kubernetes" {
// source = "ESSch / kubernetes / google"
// version = "0.0.2"
//
// project_name = "node-cluster-243923"
// region = "europe-west2"
//}
provider "google" {
credentials = "$ {file (" ./ kubernetes_key.json ")}"
project = "node-cluster-243923"
region = "europe-west2"
}
module "Kubernetes" {
source = "./Kubernetes"
project_name = "node-cluster-243923"
region = "europe-west2"
}
module "nodejs" {
source = "./nodejs"
}
essh @ kubernetes-master: ~ / node-cluster $ sudo ./terraform init
essh @ kubernetes-master: ~ / node-cluster $ sudo ./terraform apply
Now let's transfer data from the Kubernetes infrastructure
