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07-Remote-Access.md

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Configuring kubectl for Remote Access

Run in master node, $HOME directory, also embed all the certificates in the config file, in case we move the temporary directory pki and easier if we want to download the configuration file.

Prepare Configuration File

KUBERNETES_PUBLIC_ADDRESS=192.168.1.164
kubectl config set-cluster kubernetes-the-hard-way \
    --certificate-authority=pki/ca.pem \
    --embed-certs=true \
    --server=https://${KUBERNETES_PUBLIC_ADDRESS}:6443

kubectl config set-credentials admin \
    --client-certificate=pki/admin.pem \
    --client-key=pki/admin-key.pem \
    --embed-certs=true

kubectl config set-context kubernetes-the-hard-way \
    --cluster=kubernetes-the-hard-way \
    --user=admin

kubectl config use-context kubernetes-the-hard-way

The result is stored in ~/.kube/config file, download the config file.

scp pi@rpi-k8s-master.local:~/.kube/config /home/abel/.kube/

Verification from Remote Computer

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"19", GitVersion:"v1.19.4", GitCommit:"d360454c9bcd1634cf4cc52d1867af5491dc9c5f", GitTreeState:"clean", BuildDate:"2020-11-11T13:17:17Z", GoVersion:"go1.15.2", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"18+", GitVersion:"v1.18.13-rc.0.15+6d211539692cee", GitCommit:"6d211539692cee9ca82d8e1a6831f7e51e66558d", GitTreeState:"clean", BuildDate:"2020-11-23T19:28:31Z", GoVersion:"go1.15.5", Compiler:"gc", Platform:"linux/arm"}
$ kubectl get componentstatuses
NAME                 STATUS    MESSAGE             ERROR
controller-manager   Healthy   ok                  
scheduler            Healthy   ok                  
etcd-0               Healthy   {"health":"true"}   
$ kubectl get nodes
NAME   STATUS   ROLES    AGE    VERSION
p1     Ready    <none>   36h    v1.18.13-rc.0.15+6d211539692cee-dirty
p2     Ready    <none>   114m   v1.18.13-rc.0.15+6d211539692cee-dirty
$ kubectl get --raw='/readyz?verbose'
[+]ping ok
[+]log ok
[+]etcd ok
[+]poststarthook/start-kube-apiserver-admission-initializer ok
[+]poststarthook/generic-apiserver-start-informers ok
[+]poststarthook/start-apiextensions-informers ok
[+]poststarthook/start-apiextensions-controllers ok
[+]poststarthook/crd-informer-synced ok
[+]poststarthook/bootstrap-controller ok
[+]poststarthook/rbac/bootstrap-roles ok
[+]poststarthook/scheduling/bootstrap-system-priority-classes ok
[+]poststarthook/apiserver/bootstrap-system-flowcontrol-configuration ok
[+]poststarthook/start-cluster-authentication-info-controller ok
[+]poststarthook/start-kube-aggregator-informers ok
[+]poststarthook/apiservice-registration-controller ok
[+]poststarthook/apiservice-status-available-controller ok
[+]poststarthook/kube-apiserver-autoregistration ok
[+]autoregister-completion ok
[+]poststarthook/apiservice-openapi-controller ok
[+]shutdown ok
healthz check passed

Test Pod Creation

From the remote computer or master node.

cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
  name: nginx-pod
  labels:
    app: nginx
spec:
  containers:
  - name: nginx
    image: arm32v5/nginx:1.18
    ports:
    - containerPort: 80
EOF
kubectl get pods -o wide -w
NAME        READY   STATUS              RESTARTS   AGE   IP       NODE   
nginx-pod   0/1     ContainerCreating   0          8s    <none>   p1     
nginx-pod   1/1     Running             0          23s   10.200.0.54   p1

Some output omitted for brevity. The important thing are that it was scheduled for Node p1 and the pod IP is 10.200.0.54. On node p1 run:

pi@p1:~ $ curl http://10.200.0.54/
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
...
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and working. Further configuration is required.</p>
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>

Success !