1. Using kubernetes cert-manager.k8s.cloudflare.com with tekton.dev

    TypeScript

    Understanding and Using cert-manager with Tekton on Kubernetes

    When you're operating Kubernetes, it's common to automate the deployment process using continuous integration and continuous deployment (CI/CD) pipelines. For this purpose, one of the tools you can use is Tekton, which offers a Kubernetes-native framework for defining and running CI/CD pipelines.

    As part of securing your pipeline's interactions with other services, it's critical to manage SSL/TLS certificates effectively. cert-manager is a native Kubernetes certificate management controller that simplifies the process of obtaining, renewing, and using SSL/TLS certificates. It supports various issuer types, including Let's Encrypt, HashiCorp Vault, Venafi, a simple signing key pair, or self-signed certificates.

    Integrating cert-manager into Kubernetes and Tekton involves several steps, which are broken down into the following parts in the provided Pulumi program:

    1. Installing cert-manager: Provisioning the cert-manager in your Kubernetes cluster to manage certificates.
    2. Configuring cert-manager issuer: Setting up an issuer that cert-manager will use to issue certificates.
    3. Integrating with Tekton: Configuring Tekton resources to facilitate CI/CD processes using secure connections with valid certificates.

    Below is a Pulumi program that demonstrates how you would configure cert-manager and integrate it with Tekton in a Kubernetes cluster using TypeScript.

    This program assumes you already have a Kubernetes cluster up and running. Pulumi is only used here to define the desired state of Kubernetes resources, ensuring that the appropriate cert-manager and Tekton setups are applied to the cluster.

    import * as k8s from '@pulumi/kubernetes'; // Initialize a Kubernetes provider with default settings from ~/.kube/config. const provider = new k8s.Provider('k8s-provider', {}); // Deploy cert-manager to your Kubernetes cluster. // It will take care of issuing and renewing certificates. const certManagerNamespace = new k8s.core.v1.Namespace('cert-manager-namespace', { metadata: { name: 'cert-manager' } }, { provider }); const certManagerChart = new k8s.helm.v3.Chart('cert-manager', { chart: 'cert-manager', version: 'v1.6.1', namespace: certManagerNamespace.metadata.name, fetchOpts: { repo: 'https://charts.jetstack.io', }, }, { provider }); // Here we configure Cloudflare as a DNS provider for cert-manager. // Replace <your-email> and <your-api-key> with your Cloudflare credentials. const cloudflareSecret = new k8s.core.v1.Secret('cloudflare-api-key-secret', { metadata: { name: 'cloudflare-api-key', namespace: certManagerNamespace.metadata.name, }, stringData: { 'api-key': '<your-api-key>', 'email': '<your-email>', }, }, { provider }); const cloudflareIssuer = new k8s.apiextensions.CustomResource('cloudflare-issuer', { apiVersion: 'cert-manager.io/v1', kind: 'ClusterIssuer', metadata: { name: 'cloudflare-issuer', }, spec: { acme: { email: '<your-email>', server: 'https://acme-v02.api.letsencrypt.org/directory', privateKeySecretRef: { name: 'letsencrypt-private-key', }, solvers: [{ dns01: { cloudflare: { email: '<your-email>', apiKeySecretRef: { name: 'cloudflare-api-key', key: 'api-key', }, }, }, }], }, }, }, { provider, dependsOn: [cloudflareSecret] }); // Deploy Tekton to the Kubernetes cluster. // Tekton Pipelines is a project that provides Kubernetes-style // resources for declaring CI/CD-style pipelines. const tektonNamespace = new k8s.core.v1.Namespace('tekton-pipelines-namespace', { metadata: { name: 'tekton-pipelines' } }, { provider }); const tektonChart = new k8s.helm.v3.Chart('tekton', { chart: 'tekton-pipeline', version: '0.28.1', namespace: tektonNamespace.metadata.name, fetchOpts: { repo: 'https://storage.googleapis.com/tekton-releases/pipeline/previous/v0.28.1/release.yaml', }, }, { provider }); // After the program completes, you can fetch the kubectl config file for cluster access. // When cert-manager is up and running, it will work with Cloudflare to automatically issue and renew certificates // for domains you have configured in your ingress resources or other custom resource definitions using the Cloudflare issuer. // Export the namespace names export const certManagerNamespaceName = certManagerNamespace.metadata.name; export const tektonNamespaceName = tektonNamespace.metadata.name;

    Key points in the program:

    • We first create namespaces for cert-manager and Tekton.
    • We deploy cert-manager using its Helm chart, which will install it into our Kubernetes cluster.
    • We set up a ClusterIssuer for cert-manager, configured to use Cloudflare for DNS challenges. You will need to replace placeholder values with your actual Cloudflare credentials.
    • We deploy Tekton using the provided tekton-pipeline Helm chart.

    After applying this program with Pulumi, your cluster would have cert-manager ready to manage your certificates and Tekton set up for running CI/CD pipelines, both configured to secure your pipeline's interactions using SSL/TLS certificates.

    Remember to replace <your-email> and <your-api-key> with your Cloudflare account's respective email and API key to authenticate with the Cloudflare API. Also, remember that Pulumi persists the state of your infrastructure, allowing you to track changes and manage your Kubernetes resources over time.


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