6.7 KiB
Generating Kubernetes Configuration Files for Authentication
In this lab you will generate Kubernetes configuration files, also known as kubeconfigs, which enable Kubernetes clients to locate and authenticate to the Kubernetes API Servers.
Client Authentication Configs
In this section you will generate kubeconfig files for the controller manager, kubelet, kube-proxy, and scheduler clients and the admin user.
Kubernetes Public IP Address
Each kubeconfig requires a Kubernetes API Server to connect to. To support high availability the IP address assigned to the external load balancer fronting the Kubernetes API Servers will be used.
Retrieve the kubernetes-the-hard-way static IP address:
gcloud
KUBERNETES_PUBLIC_ADDRESS=$(gcloud compute addresses describe kubernetes-the-hard-way \
--region $(gcloud config get-value compute/region) \
--format 'value(address)')
az
KUBERNETES_PUBLIC_ADDRESS=$(az network public-ip show --name kubernetes-the-hard-way --query ipAddress -o tsv)
The kubelet Kubernetes Configuration File
When generating kubeconfig files for Kubelets the client certificate matching the Kubelet's node name must be used. This will ensure Kubelets are properly authorized by the Kubernetes Node Authorizer.
The following commands must be run in the same directory used to generate the SSL certificates during the Generating TLS Certificates lab.
Generate a kubeconfig file for each worker node:
for instance in worker-0 worker-1 worker-2; do
kubectl config set-cluster kubernetes-the-hard-way \
--certificate-authority=ca.pem \
--embed-certs=true \
--server=https://${KUBERNETES_PUBLIC_ADDRESS}:6443 \
--kubeconfig=${instance}.kubeconfig
kubectl config set-credentials system:node:${instance} \
--client-certificate=${instance}.pem \
--client-key=${instance}-key.pem \
--embed-certs=true \
--kubeconfig=${instance}.kubeconfig
kubectl config set-context default \
--cluster=kubernetes-the-hard-way \
--user=system:node:${instance} \
--kubeconfig=${instance}.kubeconfig
kubectl config use-context default --kubeconfig=${instance}.kubeconfig
done
Results:
worker-0.kubeconfig
worker-1.kubeconfig
worker-2.kubeconfig
The kube-proxy Kubernetes Configuration File
Generate a kubeconfig file for the kube-proxy service:
kubectl config set-cluster kubernetes-the-hard-way \
--certificate-authority=ca.pem \
--embed-certs=true \
--server=https://${KUBERNETES_PUBLIC_ADDRESS}:6443 \
--kubeconfig=kube-proxy.kubeconfig
kubectl config set-credentials system:kube-proxy \
--client-certificate=kube-proxy.pem \
--client-key=kube-proxy-key.pem \
--embed-certs=true \
--kubeconfig=kube-proxy.kubeconfig
kubectl config set-context default \
--cluster=kubernetes-the-hard-way \
--user=system:kube-proxy \
--kubeconfig=kube-proxy.kubeconfig
kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig
Results:
kube-proxy.kubeconfig
The kube-controller-manager Kubernetes Configuration File
Generate a kubeconfig file for the kube-controller-manager service:
kubectl config set-cluster kubernetes-the-hard-way \
--certificate-authority=ca.pem \
--embed-certs=true \
--server=https://127.0.0.1:6443 \
--kubeconfig=kube-controller-manager.kubeconfig
kubectl config set-credentials system:kube-controller-manager \
--client-certificate=kube-controller-manager.pem \
--client-key=kube-controller-manager-key.pem \
--embed-certs=true \
--kubeconfig=kube-controller-manager.kubeconfig
kubectl config set-context default \
--cluster=kubernetes-the-hard-way \
--user=system:kube-controller-manager \
--kubeconfig=kube-controller-manager.kubeconfig
kubectl config use-context default --kubeconfig=kube-controller-manager.kubeconfig
Results:
kube-controller-manager.kubeconfig
The kube-scheduler Kubernetes Configuration File
Generate a kubeconfig file for the kube-scheduler service:
kubectl config set-cluster kubernetes-the-hard-way \
--certificate-authority=ca.pem \
--embed-certs=true \
--server=https://127.0.0.1:6443 \
--kubeconfig=kube-scheduler.kubeconfig
kubectl config set-credentials system:kube-scheduler \
--client-certificate=kube-scheduler.pem \
--client-key=kube-scheduler-key.pem \
--embed-certs=true \
--kubeconfig=kube-scheduler.kubeconfig
kubectl config set-context default \
--cluster=kubernetes-the-hard-way \
--user=system:kube-scheduler \
--kubeconfig=kube-scheduler.kubeconfig
kubectl config use-context default --kubeconfig=kube-scheduler.kubeconfig
Results:
kube-scheduler.kubeconfig
The admin Kubernetes Configuration File
Generate a kubeconfig file for the admin user:
kubectl config set-cluster kubernetes-the-hard-way \
--certificate-authority=ca.pem \
--embed-certs=true \
--server=https://127.0.0.1:6443 \
--kubeconfig=admin.kubeconfig
kubectl config set-credentials admin \
--client-certificate=admin.pem \
--client-key=admin-key.pem \
--embed-certs=true \
--kubeconfig=admin.kubeconfig
kubectl config set-context default \
--cluster=kubernetes-the-hard-way \
--user=admin \
--kubeconfig=admin.kubeconfig
kubectl config use-context default --kubeconfig=admin.kubeconfig
Results:
admin.kubeconfig
Distribute the Kubernetes Configuration Files
Copy the appropriate kubelet and kube-proxy kubeconfig files to each worker instance:
gcloud
for instance in worker-0 worker-1 worker-2; do
gcloud compute scp ${instance}.kubeconfig kube-proxy.kubeconfig ${instance}:~/
done
az
for instance in worker-0 worker-1 worker-2; do
IP=$(az vm show -d --name ${instance} --query "publicIps" -o tsv)
scp ${instance}.kubeconfig azureuser@${IP}:/home/azureuser
scp kube-proxy.kubeconfig azureuser@${IP}:/home/azureuser
done
Copy the appropriate kube-controller-manager and kube-scheduler kubeconfig files to each controller instance:
gcloud
for instance in controller-0 controller-1 controller-2; do
gcloud compute scp admin.kubeconfig kube-controller-manager.kubeconfig kube-scheduler.kubeconfig ${instance}:~/
done
az
for instance in controller-0 controller-1 controller-2; do
IP=$(az vm show -d --name ${instance} --query "publicIps" -o tsv)
scp admin.kubeconfig azureuser@${IP}:/home/azureuser
scp kube-controller-manager.kubeconfig azureuser@${IP}:/home/azureuser
scp kube-scheduler.kubeconfig azureuser@${IP}:/home/azureuser
done