K8s Manifest to GruCloud Code
This code generator takes any kubernetes YAML manifests and creates the corresponding resources written with the GruCloud Javascript SDK.
Currently used to create the following kubernetes modules:
k8s-manifest2code supports reading from a single file, recursively from a directory, and from HTTPS.
Tutorial: How to create a Kubernetes Module with k8s-manifest2code
We'll create a web ui dashboard grucloud module and its example with the help of the k8s-manifest2code generator.
Create the module-k8s-dashboard project
mkdir web-ui-dashboard
cd web-ui-dashboard
Let's create a package.json for this module:
- in the particular case the package name is @grucloud/example-module-k8s-web-ui-dashboard
- the entry point should be the generated file resources.js
npm init
Install the dependencies:
npm install @grucloud/core @grucloud/provider-k8s @grucloud/k8s-manifest2code
Npm scripts
We'll add 2 npm scripts in the package.json.
-
download-manifest
: downloads the manifest locally and name it web-ui-dashboard.yaml. -
gen-code
: generate the GruCloud code resource.js from this manifest with k8s-manifest2code.
We found out the manifest URL from the official documentation 'deploying-the-dashboard-ui'
// package.json
"scripts": {
"download-manifest": "curl -L -o web-ui-dashboard.yaml https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0/aio/deploy/recommended.yaml",
"gen-code": "k8s-manifest2code --input web-ui-dashboard.yaml"
},
Download the manifest
Download the manifest with:
npm run download-manifest
Check to content of web-ui-dashboard.yaml, you are supposed to find a set of K8s resources such as Namespace, ServiceAccount, Service, Secret, Config Map, Role, RoleBinding, Deployment, etc ....
Generate the code
Generate the GruCloud source code from the k8s manifest:
npm run gen-code
Check the resources.js to find out which resources will be set up.
Create an example project
mkdir example
cd example
Let's create a package.json, in the case the package name is @grucloud/example-module-k8s-web-ui-dashboard:
npm init
Install the dependencies:
npm install @grucloud/core @grucloud/provider-k8s @grucloud/example-module-k8s-web-ui-dashboard
Create the iac.js file
It is now time to create a K8s provider and uses the generated createResources function from package @grucloud/module-k8s-web-ui-dashboard
// iac.js
const { K8sProvider } = require("@grucloud/provider-k8s");
const { createResources } = require("../resources");
exports.createStack = async ({ createProvider }) => {
const provider = createProvider(K8sProvider, { config: require("./config") });
const resources = await createResources({ provider });
return { provider, resources };
};
Deploying
Ensure your cluster is running and execute:
gc apply
┌──────────────────────────────────────────────────────────────────────────────────────────────┐
│ Plan summary for provider k8s │
├──────────────────────────────────────────────────────────────────────────────────────────────┤
│ DEPLOY RESOURCES │
├────────────────────┬─────────────────────────────────────────────────────────────────────────┤
│ ServiceAccount │ kubernetes-dashboard │
├────────────────────┼─────────────────────────────────────────────────────────────────────────┤
│ Service │ kubernetes-dashboard, dashboard-metrics-scraper │
├────────────────────┼─────────────────────────────────────────────────────────────────────────┤
│ Secret │ kubernetes-dashboard-certs, kubernetes-dashboard-csrf │
├────────────────────┼─────────────────────────────────────────────────────────────────────────┤
│ ConfigMap │ kubernetes-dashboard-settings │
├────────────────────┼─────────────────────────────────────────────────────────────────────────┤
│ Role │ kubernetes-dashboard │
├────────────────────┼─────────────────────────────────────────────────────────────────────────┤
│ ClusterRole │ kubernetes-dashboard │
├────────────────────┼─────────────────────────────────────────────────────────────────────────┤
│ RoleBinding │ kubernetes-dashboard │
├────────────────────┼─────────────────────────────────────────────────────────────────────────┤
│ ClusterRoleBinding │ kubernetes-dashboard │
├────────────────────┼─────────────────────────────────────────────────────────────────────────┤
│ Deployment │ kubernetes-dashboard, dashboard-metrics-scraper │
└────────────────────┴─────────────────────────────────────────────────────────────────────────┘
? Are you sure to deploy 12 resources, 9 types on 1 provider? › (y/N)
Deploying resources on 1 provider: k8s
✓ k8s
✓ Initialising
✓ Deploying
✓ ServiceAccount 1/1
✓ Service 2/2
✓ Secret 2/2
✓ ConfigMap 1/1
✓ Role 1/1
✓ ClusterRole 1/1
✓ RoleBinding 1/1
✓ ClusterRoleBinding 1/1
✓ Deployment 2/2
12 resources deployed of 9 types and 1 provider
Command "gc apply" executed in 52s
The Web Ui Dashboard should be up and running. GruCloud waits for all the resources to up. For instance, a deployment is considered up if one of the container's pod started by the deployment is running.