{"id":4063,"date":"2024-12-15T07:26:15","date_gmt":"2024-12-15T07:26:15","guid":{"rendered":"https:\/\/code2deploy.com\/blog\/?p=4063"},"modified":"2025-02-27T15:59:23","modified_gmt":"2025-02-27T15:59:23","slug":"installing-rancher-on-k3s-with-ingress-domain-and-ssl-configuration","status":"publish","type":"post","link":"https:\/\/code2deploy.com\/blog\/installing-rancher-on-k3s-with-ingress-domain-and-ssl-configuration\/","title":{"rendered":"Installing Rancher on K3s with Ingress, Domain, and SSL Configuration"},"content":{"rendered":"\n

In this tutorial, we’ll walk through the process of setting up Rancher<\/strong> on a K3s<\/strong> cluster. We’ll cover prerequisites like setting up an Ingress Controller<\/strong>, configuring a Domain Name<\/strong>, enabling SSL<\/strong> with Let’s Encrypt, and editing the agent-tls-mode before registering your existing cluster to Rancher.<\/p>\n\n\n\n

\n\n\n\n

Prerequisites<\/strong><\/h2>\n\n\n\n
    \n
  • A K3s cluster<\/strong> running (either on a local machine or in a cloud environment).<\/li>\n\n\n\n
  • kubectl<\/strong> installed and configured to interact with the K3s cluster.<\/li>\n\n\n\n
  • A domain<\/strong> name that you can point to your K3s server (e.g., rancher.example.com).<\/li>\n\n\n\n
  • Access to the internet<\/strong> for downloading Rancher and obtaining SSL certificates (via Let’s Encrypt).<\/li>\n<\/ul>\n\n\n\n
    \n\n\n\n

    Step 1: Install K3s<\/strong><\/h2>\n\n\n\n

    If you don’t already have K3s installed, you can install it with the following command on your master node:<\/p>\n\n\n\n

    curl -sfL https:\/\/get.k3s.io | sh –<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    Verify the installation by checking the node status:<\/p>\n\n\n\n

    kubectl get nodes<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    You should see your K3s node listed.<\/p>\n\n\n\n

    \n\n\n\n

    Step 2: Set Up Ingress Controller<\/strong><\/h2>\n\n\n\n

    Rancher requires an Ingress controller<\/strong> to handle external traffic. We will use Traefik<\/strong>, which is the default Ingress controller in K3s.<\/p>\n\n\n\n

    To ensure Traefik is installed, run:<\/p>\n\n\n\n

    kubectl get pods -n kube-system | grep traefik<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    You should see a traefik pod running. If it’s not running, you can install it manually using Helm (optional).<\/p>\n\n\n\n

    \n\n\n\n

    Step 3: Configure Domain for Rancher<\/strong><\/h2>\n\n\n\n

    Now, you need to configure your DNS<\/strong> to point to your K3s node’s IP address. You will need a domain name (e.g., rancher.example.com).<\/p>\n\n\n\n

    Create a DNS A record<\/strong> pointing to the IP address<\/strong> of your K3s server.
    Example:
    arduino<\/p>\n\n\n\n

    rancher.example.com -> <Your-K3s-Server-IP><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \n\n\n\n

    Step 4: Install Rancher<\/strong><\/h2>\n\n\n\n

    To install Rancher using Helm, first add the Rancher chart repository:<\/p>\n\n\n\n

    helm repo add rancher-latest https:\/\/releases.rancher.com\/server-charts\/latest
    helm repo update<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    Now, install Rancher on your cluster. Ensure that Traefik is enabled and that you\u2019re installing Rancher in the cattle-system namespace.<\/p>\n\n\n\n

    kubectl create namespace cattle-system<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    helm install rancher rancher-latest\/rancher \\
      –namespace cattle-system \\
      –set hostname=rancher.example.com \\
      –set replicas=1<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    This will install Rancher and expose it on your domain (rancher.example.com).<\/p>\n\n\n\n

    \n\n\n\n

    Step 5: Set Up SSL with Let’s Encrypt<\/strong><\/h2>\n\n\n\n

    To ensure secure communication, we\u2019ll set up SSL using Let’s Encrypt<\/strong> for automatic SSL certificate management.<\/p>\n\n\n\n

      \n
    1. Create a certificate for Rancher<\/strong> by editing the Helm values to include Let’s Encrypt settings:<\/li>\n<\/ol>\n\n\n\n
      helm upgrade rancher rancher-latest\/rancher \\
        –namespace cattle-system \\
        –set hostname=rancher.example.com \\
        –set replicas=1 \\
        –set ingress.tls=true \\
        –set ingress.extraAnnotations.”cert-manager\\.io\/cluster-issuer”=”letsencrypt-prod”<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
        \n
      1. Install Cert-Manager<\/strong> (if you haven’t already) to handle SSL certificates with Let’s Encrypt:<\/li>\n<\/ol>\n\n\n\n
        kubectl apply -f https:\/\/github.com\/jetstack\/cert-manager\/releases\/download\/v1.11.0\/cert-manager.crds.yaml
        kubectl apply -f https:\/\/github.com\/jetstack\/cert-manager\/releases\/download\/v1.11.0\/cert-manager.yaml<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
          \n
        1. Create a ClusterIssuer for Let’s Encrypt<\/strong>:<\/li>\n<\/ol>\n\n\n\n

          Create a ClusterIssuer for Let’s Encrypt to automatically issue certificates:<\/p>\n\n\n\n

          apiVersion: cert-manager.io\/v1
          kind: ClusterIssuer
          metadata:
            name: lets-encrypt-prod
          spec:
            acme:
              email: your-email@example.com
              server: https:\/\/acme-v02.api.letsencrypt.org\/directory
              privateKeySecretRef:
                name: lets-encrypt-prod
              solvers:
                – http01:
                    ingress:
                      class: traefik<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

          Apply the configuration:<\/p>\n\n\n\n

          kubectl apply -f lets-encrypt-prod-clusterissuer.yaml<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

          This will enable automatic SSL certification via Let’s Encrypt.<\/p>\n\n\n\n

          \n\n\n\n

          Step 6: Edit <\/strong>agent-tls-mode<\/strong> Before Registering the Cluster<\/strong><\/h2>\n\n\n\n

          Now that Rancher is installed and accessible via your domain, you need to configure the agent-tls-mode to allow the K3s cluster to register with Rancher.<\/p>\n\n\n\n

          Before registering your existing cluster to Rancher, you’ll need to edit the agent-tls-mode setting. By default, Rancher uses strict TLS mode, but you may need to change it to system-store for K3s clusters.<\/p>\n\n\n\n

          Patch the <\/strong>agent-tls-mode<\/strong> setting<\/strong>:
          Run the following kubectl command to change the setting from strict to system-store:

          <\/p>\n\n\n\n

          kubectl patch setting agent-tls-mode -n cattle-system –type merge -p ‘{“value”: “system-store”}’<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
            \n
          1. <\/li>\n<\/ol>\n\n\n\n

            Verify the Change<\/strong>:
            Confirm that the change has been applied successfully by checking the setting:

            <\/p>\n\n\n\n

            kubectl get setting agent-tls-mode -n cattle-system -o yaml<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
              \n
            1. You should now see the value set to system-store.<\/li>\n<\/ol>\n\n\n\n
              \n\n\n\n

              Step 7: Register the Existing Cluster to Rancher<\/strong><\/h2>\n\n\n\n
                \n
              1. Access the Rancher UI<\/strong> by navigating to https:\/\/rancher.example.com in your browser.<\/li>\n\n\n\n
              2. Log in<\/strong> with the credentials you set up during installation.<\/li>\n\n\n\n
              3. Once logged in, click on “Add Cluster”<\/strong> and follow the instructions for registering your K3s cluster. You will need to run a registration command on your K3s cluster.<\/li>\n<\/ol>\n\n\n\n

                Rancher will generate a command to run on the K3s cluster for registration. Copy and run this command on your K3s node:<\/p>\n\n\n\n

                curl -sfL https:\/\/get.rancher.io | sh –<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

                After the registration process is complete, your K3s cluster will be managed via Rancher!<\/p>\n\n\n\n

                \n\n\n\n

                Port-Forwarding:<\/strong><\/h2>\n\n\n\n

                For testing or development purposes, you can use port-forwarding to access Rancher without exposing it externally:
                <\/p>\n\n\n\n

                kubectl port-forward svc\/rancher -n cattle-system 8080:80<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
                  \n
                • Then you can access Rancher locally via http:\/\/localhost:8080. However, this is not recommended for production environments as it limits external access.<\/li>\n<\/ul>\n\n\n\n

                  If you want to access and log in to Rancher<\/strong> using a public domain<\/strong>, you will need to:<\/p>\n\n\n\n

                    \n
                  1. Set Up a Public Domain<\/strong>: You should have a domain (e.g., rancher.example.com) that points to your Rancher server.<\/li>\n\n\n\n
                  2. Expose Rancher Using Ingress<\/strong>: Use an Ingress controller<\/strong> to route the public domain traffic to Rancher running in your K3s cluster.<\/li>\n\n\n\n
                  3. Set Up SSL\/TLS for Security<\/strong>: It’s important to secure your Rancher UI with SSL (HTTPS) to ensure data privacy and security.<\/li>\n<\/ol>\n\n\n\n

                    Here’s a step-by-step guide on how to configure Rancher to be accessed via a public domain.<\/p>\n\n\n\n

                    \n\n\n\n

                    Step-by-Step Tutorial for Exposing Rancher via a Public Domain<\/strong><\/h3>\n\n\n\n

                    Step 1: Prepare Your Public Domain<\/strong><\/h4>\n\n\n\n
                      \n
                    • If you don’t already have one, purchase a domain name (e.g., rancher.example.com) from a domain registrar.<\/li>\n\n\n\n
                    • Point the domain to the IP address of your K3s cluster<\/strong>. If you have a load balancer or public IP, make sure the domain points to it.\n
                        \n
                      • Update your DNS<\/strong> settings (via your domain registrar) to create an A record<\/strong> that points to the IP address of your K3s node or LoadBalancer.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n

                        Step 2: Set Up an Ingress Controller<\/strong><\/h4>\n\n\n\n

                        K3s comes with Traefik<\/strong> as the default Ingress controller, but you can install any Ingress controller of your choice.<\/p>\n\n\n\n

                        If you’re using Traefik<\/strong>, it should be installed by default in K3s.<\/p>\n\n\n\n

                        To expose Rancher using Traefik, ensure the Ingress resource for Rancher is correctly set.<\/p>\n\n\n\n

                        Create an Ingress Resource for Rancher<\/strong>:
                        Create a file called rancher-ingress.yaml with the following content:

                        <\/p>\n\n\n\n

                        apiVersion: networking.k8s.io\/v1
                        kind: Ingress
                        metadata:
                          name: rancher
                          namespace: cattle-system
                          annotations:
                            cert-manager.io\/cluster-issuer: “letsencrypt-prod” # Optional, if using Let’s Encrypt
                        spec:
                          rules:
                          – host: rancher.example.com  # Replace with your domain
                            http:
                              paths:
                              – path: \/
                                pathType: Prefix
                                backend:
                                  service:
                                    name: rancher
                                    port:
                                      name: https
                          tls:
                          – hosts:
                            – rancher.example.com
                            secretName: rancher-tls<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

                        Apply this file with:

                        <\/p>\n\n\n\n

                        kubectl apply -f rancher-ingress.yaml<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
                          \n
                        1. This configures an Ingress to route traffic to Rancher and sets up TLS (SSL) for secure access.<\/li>\n<\/ol>\n\n\n\n

                          Step 3: Set Up SSL\/TLS (HTTPS)<\/strong><\/h4>\n\n\n\n

                          To secure Rancher with HTTPS<\/strong>, you need to configure an SSL certificate for your domain. You can use Let’s Encrypt<\/strong> for free SSL certificates.<\/p>\n\n\n\n

                          Install cert-manager<\/strong>:

                          <\/p>\n\n\n\n

                          kubectl create namespace cert-manager
                          kubectl apply -f https:\/\/github.com\/jetstack\/cert-manager\/releases\/download\/v1.9.0\/cert-manager.yaml<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
                            \n
                          1. Create a ClusterIssuer for Let’s Encrypt<\/strong>: Create a file called letsencrypt-clusterissuer.yaml:<\/li>\n<\/ol>\n\n\n\n
                            apiVersion: cert-manager.io\/v1
                            kind: ClusterIssuer
                            metadata:
                              name: letsencrypt-prod
                            spec:
                              acme:
                                server: https:\/\/acme-v02.api.letsencrypt.org\/directory
                                email: your-email@example.com  # Replace with your email
                                privateKeySecretRef:
                                  name: letsencrypt-prod
                                solvers:
                                – http01:
                                    ingress:
                                      class: traefik<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

                            Apply it with:

                            <\/p>\n\n\n\n

                            kubectl apply -f letsencrypt-clusterissuer.yaml<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
                              \n
                            1. Create the TLS Secret for Rancher<\/strong>: Cert-manager will automatically create a secret for Rancher’s domain using the Let’s Encrypt certificate.
                              The rancher-ingress.yaml file above already points to the secret rancher-tls, which cert-manager will create once the certificate is issued.
                              If you set up cert-manager and the ClusterIssuer correctly, Rancher will automatically obtain and apply an SSL certificate from Let’s Encrypt for your public domain.<\/li>\n<\/ol>\n\n\n\n

                              Step 4: Access Rancher via Your Public Domain<\/strong><\/h4>\n\n\n\n

                              Once the Ingress resource is set up and the SSL certificate is issued (it may take a few minutes), you should be able to access Rancher via your public domain:<\/p>\n\n\n\n

                                \n
                              • Open a browser and navigate to https:\/\/rancher.example.com (replace with your actual domain).<\/li>\n\n\n\n
                              • Log in to the Rancher UI using the default admin password or credentials you set.<\/li>\n<\/ul>\n\n\n\n
                                \n\n\n\n

                                Important Notes:<\/strong><\/h3>\n\n\n\n
                                  \n
                                • DNS Propagation<\/strong>: It may take some time for your DNS records to propagate after updating them with your registrar.<\/li>\n\n\n\n
                                • SSL Certificates<\/strong>: If you’re not using Let’s Encrypt or cert-manager, you can manually create and upload an SSL certificate for your domain.<\/li>\n\n\n\n
                                • Firewall & Security<\/strong>: Ensure your firewall rules allow external traffic to the required ports (80 for HTTP, 443 for HTTPS) and that your K3s nodes are correctly exposed.<\/li>\n<\/ul>\n\n\n\n

                                  Conclusion<\/strong><\/h2>\n\n\n\n

                                  By following these steps, you\u2019ve successfully installed Rancher on a K3s cluster<\/strong>, set up Ingress<\/strong>, configured your domain<\/strong>, enabled SSL<\/strong> with Let’s Encrypt, and edited the agent-tls-mode for secure registration. Your K3s cluster is now ready to be managed by Rancher!<\/p>\n","protected":false},"excerpt":{"rendered":"

                                  In this tutorial, we’ll walk through the process of setting up Rancher on a K3s cluster. We’ll cover prerequisites like setting up an Ingress Controller, configuring a Domain Name, enabling SSL with Let’s Encrypt, and editing the agent-tls-mode before registering your existing cluster to Rancher. Prerequisites Step 1: Install K3s If you don’t already have […]<\/p>\n","protected":false},"author":1,"featured_media":4090,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[216,520],"tags":[519,518,517,516],"class_list":["post-4063","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-kubernetes-basic","category-rancher","tag-cluster-management-with-rancher","tag-helm","tag-k3s","tag-rancher"],"yoast_head":"\nInstalling Rancher on K3s with Ingress, Domain, and SSL Configuration - code2deploy.com<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/code2deploy.com\/blog\/installing-rancher-on-k3s-with-ingress-domain-and-ssl-configuration\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Installing Rancher on K3s with Ingress, Domain, and SSL Configuration - code2deploy.com\" \/>\n<meta property=\"og:description\" content=\"In this tutorial, we’ll walk through the process of setting up Rancher on a K3s cluster. We’ll cover prerequisites like setting up an Ingress Controller, configuring a Domain Name, enabling SSL with Let’s Encrypt, and editing the agent-tls-mode before registering your existing cluster to Rancher. 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