Added join step

clitools/README

@@ -26,3 +26,36 @@ And use it like this
 ```bash
 ./send.sh start_crio
 ```
+
+
+Create join token from control plane
+```
+kubeadm token create --print-join-command
+```
+
+Export the token inside the device
+```
+export DEBUG=1
+export HOSTNAME=monok8s-master-1
+export BOOTSTRAP_TOKEN=
+export TOKEN_CACERT_HASH=
+```
+
+Generate using kubectl
+```
+TOKEN_NAME=bootstrap-token-iwotl0
+
+API_SERVER=$(kubectl config view --minify -o jsonpath='{.clusters[0].cluster.server}' | sed 's|https://||') && \
+TOKEN=$(kubectl -n kube-system get secret ${TOKEN_NAME} -o jsonpath='{.data.token-id}' | base64 -d).$(kubectl -n kube-system get secret ${TOKEN_NAME} -o jsonpath='{.data.token-secret}' | base64 -d) && \
+HASH=$(kubectl -n kube-public get configmap cluster-info -o jsonpath='{.data.kubeconfig}' \
+| grep 'certificate-authority-data' \
+| awk '{print $2}' \
+| base64 -d \
+| openssl x509 -pubkey -noout \
+| openssl rsa -pubin -outform der 2>/dev/null \
+| openssl dgst -sha256 -hex \
+| awk '{print "sha256:" $2}')
+echo "export API_SERVER_ENDPOINT=${API_SERVER}"
+echo "export BOOTSTRAP_TOKEN=${TOKEN}"
+echo "export TOKEN_CACERT_HASH=${HASH}"
+```