138 lines
3.7 KiB
Markdown
138 lines
3.7 KiB
Markdown
# Setting up Authentication
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In this lab you will setup the necessary authentication configs to enable Kubernetes clients to bootstrap and authenticate using RBAC (Role-Based Access Control).
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## Download and Install kubectl
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The kubectl client will be used to generate kubeconfig files which will be consumed by the kubelet and kube-proxy services.
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### OS X
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```
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wget https://storage.googleapis.com/kubernetes-release/release/v1.6.0-rc.1/bin/darwin/amd64/kubectl
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chmod +x kubectl
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sudo mv kubectl /usr/local/bin
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```
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### Linux
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```
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wget https://storage.googleapis.com/kubernetes-release/release/v1.6.0-rc.1/bin/linux/amd64/kubectl
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chmod +x kubectl
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sudo mv kubectl /usr/local/bin
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```
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## Authentication
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The following components will leverge Kubernetes RBAC:
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* kubelet (client)
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* kube-proxy (client)
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* kubectl (client)
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The other components, mainly the `scheduler` and `controller manager`, access the Kubernetes API server locally over the insecure API port which does not require authentication. The insecure port is only enabled for local access.
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### Create the TLS Bootstrap Token
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This section will walk you through the creation of a TLS bootstrap token that will be used to [bootstrap TLS client certificates for kubelets](https://kubernetes.io/docs/admin/kubelet-tls-bootstrapping/).
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Generate a token:
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BOOTSTRAP_TOKEN=$(head -c 16 /dev/urandom | od -An -t x | tr -d ' ')
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Generate a token file:
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```
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cat > token.csv <<EOF
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${BOOTSTRAP_TOKEN},kubelet-bootstrap,10001,"system:kubelet-bootstrap"
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EOF
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```
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Distribute the bootstrap token file to each controller node:
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```
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for host in controller0 controller1 controller2; do
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gcloud compute copy-files token.csv ${host}:~/
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done
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```
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## Client Authentication Configs
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This section will walk you through creating kubeconfig files that will be used to bootstrap kubelets, which will then generate their own kubeconfigs based on dynamically generated certificates, and a kubeconfig for authenticating kube-proxy clients.
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Each kubeconfig requires a Kubernetes master to connect to. To support H/A the IP address assigned to the load balancer sitting in front of the Kubernetes API servers will be used.
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### Set the Kubernetes Public Address
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```
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KUBERNETES_PUBLIC_ADDRESS=$(gcloud compute addresses describe kubernetes-the-hard-way \
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--region us-central1 \
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--format 'value(address)')
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```
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## Create client kubeconfig files
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### Create the bootstrap kubeconfig file
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```
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kubectl config set-cluster kubernetes-the-hard-way \
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--certificate-authority=ca.pem \
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--embed-certs=true \
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--server=https://${KUBERNETES_PUBLIC_ADDRESS}:6443 \
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--kubeconfig=bootstrap.kubeconfig
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```
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```
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kubectl config set-credentials kubelet-bootstrap \
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--token=${BOOTSTRAP_TOKEN} \
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--kubeconfig=bootstrap.kubeconfig
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```
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```
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kubectl config set-context default \
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--cluster=kubernetes-the-hard-way \
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--user=kubelet-bootstrap \
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--kubeconfig=bootstrap.kubeconfig
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```
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```
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kubectl config use-context default --kubeconfig=bootstrap.kubeconfig
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```
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### Create the kube-proxy kubeconfig
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```
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kubectl config set-cluster kubernetes-the-hard-way \
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--certificate-authority=ca.pem \
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--embed-certs=true \
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--server=https://${KUBERNETES_PUBLIC_ADDRESS}:6443 \
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--kubeconfig=kube-proxy.kubeconfig
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```
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```
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kubectl config set-credentials kube-proxy \
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--client-certificate=kube-proxy.pem \
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--client-key=kube-proxy-key.pem \
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--embed-certs=true \
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--kubeconfig=kube-proxy.kubeconfig
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```
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```
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kubectl config set-context default \
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--cluster=kubernetes-the-hard-way \
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--user=kube-proxy \
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--kubeconfig=kube-proxy.kubeconfig
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```
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```
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kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig
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```
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## Distribute the client kubeconfig files
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```
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for host in worker0 worker1 worker2; do
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gcloud compute copy-files bootstrap.kubeconfig kube-proxy.kubeconfig ${host}:~/
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done
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``` |