Create a new AWS Kubernetes cluster in an Air-gapped environment.

Create a new AWS Kubernetes cluster in an existing infrastructure

When you use existing infrastructure, DKP does not create, modify, or delete the following AWS resources:

  • Internet Gateways

  • NAT Gateways

  • Routing tables

  • Subnets

  • VPC

  • VPC Endpoints (for subnets without NAT Gateways)

An AWS subnet has Network ACLs that can control traffic in and out of the subnet. DKP does not modify the Network ACLs of an existing subnet. DKP uses Security Groups to control traffic. If a Network ACL denies traffic that is allowed by DKP-managed Security Groups, the cluster may not work correctly.

  1. Set the environment variable to the name you assigned this cluster:

    export CLUSTER_NAME=aws-example
    CODE

    See Get Started with AWS for information on naming your cluster.

    NOTE: The cluster name may only contain the following characters: a-z, 0-9, ., and -. Cluster creation will fail if the name has capital letters. See Kubernetes for more naming information.

  2. Export variables for the existing infrastructure details:

    export AWS_VPC_ID=<vpc-...>
    export AWS_SUBNET_IDS=<subnet-...,subnet-...,subnet-...>
    export AWS_ADDITIONAL_SECURITY_GROUPS=<sg-...,sg-...>
    export AWS_AMI_ID=<ami-...>
    CODE
    • AWS_VPC_ID: the VPC ID where the cluster will be created. The VPC requires the ec2, elasticloadbalancing, secretsmanager and autoscaling VPC endpoints to be already present.

    • AWS_SUBNET_IDS: a comma-separated list of one or more private Subnet IDs with each one in a different Availability Zone. The cluster control-plane and worker nodes will automatically be spread across these Subnets.

    • AWS_ADDITIONAL_SECURITY_GROUPS: a comma-seperated list of one or more Security Groups IDs to use in addition to the ones automatically created by CAPA.

    • AWS_AMI_ID: the AMI ID to use for control-plane and worker nodes. The AMI must be created by the konvoy-image-builder.

    IMPORTANT: You must tag the subnets as described below to allow for Kubernetes to create ELBs for services of type LoadBalancer in those subnets. If the subnets are not tagged, they will not receive an ELB and the following error displays: Error syncing load balancer, failed to ensure load balancer; could not find any suitable subnets for creating the ELB..

    The tags should be set as follows, where <CLUSTER_NAME> corresponds to the name set in CLUSTER_NAME environment variable:

    kubernetes.io/cluster = <CLUSTER_NAME>
    kubernetes.io/cluster/<CLUSTER_NAME> = owned
    kubernetes.io/role/internal-elb = 1
    CODE

  3. Configure your cluster to use an existing Docker registry as a mirror when attempting to pull images:

    IMPORTANT: The AMI must be created by the konvoy-image-builder project in order to use the registry mirror feature.

    export DOCKER_REGISTRY_URL=<https/http>://<registry-address>:<registry-port>
    export DOCKER_REGISTRY_CA=<path to the CA on the bastion>
    export DOCKER_REGISTRY_USERNAME=<username>
    export DOCKER_REGISTRY_PASSWORD=<password>
    CODE
    • DOCKER_REGISTRY_URL: the address of an existing Docker registry accessible in the VPC that the new cluster nodes will be configured to use a mirror registry when pulling images.

    • DOCKER_REGISTRY_CA: (optional) the path on the bastion machine to the Docker registry CA. dkp will configure the cluster nodes to trust this CA. This value is only needed if the registry is using a self-signed certificate and the AMIs are not already configured to trust this CA.

    • DOCKER_REGISTRY_USERNAME: optional, set to a user that has pull access to this registry.

    • DOCKER_REGISTRY_PASSWORD: optional if username is not set.

  4. Create a Kubernetes cluster:

    dkp create cluster aws --cluster-name=${CLUSTER_NAME} \
    --vpc-id=${AWS_VPC_ID} \
    --ami=${AWS_AMI_ID} \
    --subnet-ids=${AWS_SUBNET_IDS} \
    --internal-load-balancer=true \
    --additional-security-group-ids=${AWS_ADDITIONAL_SECURITY_GROUPS} \
    --registry-mirror-url=${DOCKER_REGISTRY_URL} \
    --registry-mirror-cacert=${DOCKER_REGISTRY_CA} \
    --registry-mirror-username=${DOCKER_REGISTRY_USERNAME} \
    --registry-mirror-password=${DOCKER_REGISTRY_PASSWORD}
    CODE

  5. (Optional) The Control Plane and Worker nodes can be configured to use an HTTP proxy:

    export CONTROL_PLANE_HTTP_PROXY=http://example.org:8080
    export CONTROL_PLANE_HTTPS_PROXY=http://example.org:8080
    export CONTROL_PLANE_NO_PROXY="example.org,example.com,example.net,localhost,127.0.0.1,10.96.0.0/12,192.168.0.0/16,kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.default.svc.cluster.local,.svc,.svc.cluster,.svc.cluster.local,169.254.169.254,.elb.amazonaws.com"
    
    export WORKER_HTTP_PROXY=http://example.org:8080
    export WORKER_HTTPS_PROXY=http://example.org:8080
    export WORKER_NO_PROXY="example.org,example.com,example.net,localhost,127.0.0.1,10.96.0.0/12,192.168.0.0/16,kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.default.svc.cluster.local,.svc,.svc.cluster,.svc.cluster.local,169.254.169.254,.elb.amazonaws.com"
    CODE
    • Replace example.org,example.com,example.net with you internal addresses

    • localhost and 127.0.0.1 addresses should not use the proxy

    • 10.96.0.0/12 is the default Kubernetes service subnet

    • 192.168.0.0/16 is the default Kubernetes pod subnet

    • kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.default.svc.cluster.local is the internal Kubernetes kube-apiserver service

    • .svc,.svc.cluster,.svc.cluster.local are the internal Kubernetes services

    • 169.254.169.254 is the AWS metadata server

    • .elb.amazonaws.com is for the worker nodes to allow them to communicate directly to the kube-apiserver ELB

  6. (Optional) Create a Kubernetes cluster with HTTP proxy configured. This step assumes you did not already create a cluster in the previous steps:

    dkp create cluster aws --cluster-name=${CLUSTER_NAME} \
    --vpc-id=${AWS_VPC_ID} \
    --ami=${AWS_AMI_ID} \
    --subnet-ids=${AWS_SUBNET_IDS} \
    --internal-load-balancer=true \
    --additional-security-group-ids=${AWS_ADDITIONAL_SECURITY_GROUPS} \
    --registry-mirror-url=${DOCKER_REGISTRY_URL} \
    --registry-mirror-cacert=${DOCKER_REGISTRY_CA} \
    --registry-mirror-username=${DOCKER_REGISTRY_USERNAME} \
    --registry-mirror-password=${DOCKER_REGISTRY_PASSWORD}
    --control-plane-http-proxy="${CONTROL_PLANE_HTTP_PROXY}" \
    --control-plane-https-proxy="${CONTROL_PLANE_HTTPS_PROXY}" \
    --control-plane-no-proxy="${CONTROL_PLANE_NO_PROXY}" \
    --worker-http-proxy="${WORKER_HTTP_PROXY}" \
    --worker-https-proxy="${WORKER_HTTPS_PROXY}" \
    --worker-no-proxy="${WORKER_NO_PROXY}"
    CODE

  7. Inspect the created cluster resources:

    kubectl get clusters,kubeadmcontrolplanes,machinedeployments
    CODE

  8. Wait for the cluster control-plane to be ready:

    kubectl wait --for=condition=ControlPlaneReady "clusters/${CLUSTER_NAME}" --timeout=60m
    CODE

Then, Explore the New Cluster.