package-management

Package Management

Prerequisite

• Firstly, download and install KCL according to the instructions, and then prepare a Kubernetes environment.

Quick Start

1. Init an Empty KCL Package

Create a new kcl package named my_package. And after we have created the package my_package, we need to go inside the package by cd my_package to complete the following operations.

kcl mod init my_package && cd my_package

kcl will create two kcl package configuration files: kcl.mod and kcl.mod.lock in the directory where you executed the command.

- my_package
      |- kcl.mod
      |- kcl.mod.lock
      |- # You can write your kcl program directly in this directory.

kcl.mod.lock is the file generated by kcl to fix the dependency version. Do not modify this file manually.

kcl initializes kcl.mod for an empty project as shown below:

[package]
name = "my_package"
edition = "0.0.1"
version = "0.0.1"

2. Add a Dependency from OCI Registry

You can then add a dependency to the current kcl package using the kcl mod add command

As shown below, taking the example of adding a package dependency named k8s, the version of the package is 1.29.

kcl mod add k8s

You can see that kcl adds the dependency you just added to kcl.mod.

[package]
name = "my_package"
edition = "0.0.1"
version = "0.0.1"

[dependencies]
k8s = "1.28" # The dependency 'k8s' with version '1.29'

Write a kcl program that uses the content in k8s

Create the main.k file in the current package.

- my_package
      |- kcl.mod
      |- kcl.mod.lock
      |- main.k # Your KCL program.

And write the following into the main.k file.

# Import and use the contents of the external dependency 'k8s'.
import k8s.api.core.v1 as k8core

k8core.Pod {
    metadata.name = "web-app"
    spec.containers = [{
        name = "main-container"
        image = "nginx"
        ports = [{containerPort = 80}]
    }]
}

3. Run the KCL Code

In the my_package directory, you can use kcl to compile the main.k file you just wrote.

kcl run

The output is

apiVersion: v1
kind: Pod
metadata:
  name: web-app
spec:
  containers:
    - image: nginx
      name: main-container
      ports:
        - containerPort: 80