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September 19, 2019 16:10
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Create new user certificate and kubeconfig for Kubernetes
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| #!/bin/bash | |
| # Create new user certificate and kubeconfig | |
| # Run me as user 'root' on K8s master node | |
| CA_LOCATION="/etc/kubernetes/pki" | |
| KUBECONFIG="./kubeconfig" | |
| KEY_LEN="2048" | |
| DAYS_VALID="500" | |
| NEWUSER=$1 | |
| GROUPNAME=$2 | |
| SUBJ="/CN=$NEWUSER/O=$GROUPNAME" | |
| set -e | |
| function exit_error { | |
| [[ -z "$1" ]] || echo $1 | |
| echo "Usage: $0 NEW_USER_NAME GROUP_NAME" | |
| exit 1 | |
| } | |
| function merge_kubeconfig { | |
| # merge new kubeconfig with admin.conf and remove admin credentials | |
| ADMIN_KUBECONFIG=/etc/kubernetes/admin.conf | |
| KUBECONFIG_TEMP=${KUBECONFIG}.temp | |
| KUBECONFIG=${KUBECONFIG}:${ADMIN_KUBECONFIG} \ | |
| kubectl config view --flatten > $KUBECONFIG_TEMP | |
| mv $KUBECONFIG_TEMP $KUBECONFIG | |
| export KUBECONFIG=${KUBECONFIG} | |
| CLUSTERNAME=$(kubectl config get-clusters | grep -v NAME) | |
| kubectl config unset users.kubernetes-admin | |
| kubectl config set contexts.cluster.${CLUSTERNAME}.user $NEWUSER | |
| kubectl config unset contexts | |
| kubectl config set-context kubernetes --user=$NEWUSER --cluster=$CLUSTERNAME | |
| kubectl config use-context kubernetes | |
| unset $KUBECONFIG | |
| } | |
| [[ -z "$NEWUSER" ]] && exit_error | |
| [[ -z "$GROUPNAME" ]] && exit_error | |
| [[ -f "${CA_LOCATION}/ca.key" ]] || exit_error "missing ${CA_LOCATION}/ca.key" | |
| [[ -f "${CA_LOCATION}/ca.crt" ]] || exit_error "missing ${CA_LOCATION}/ca.crt" | |
| openssl req -newkey rsa:$KEY_LEN -nodes -subj "$SUBJ" \ | |
| -out ${CA_LOCATION}/$NEWUSER.csr \ | |
| -keyout ${CA_LOCATION}/$NEWUSER.key | |
| openssl x509 -req -CA ${CA_LOCATION}/ca.crt -CAkey ${CA_LOCATION}/ca.key \ | |
| -CAcreateserial \ | |
| -in ${CA_LOCATION}/$NEWUSER.csr \ | |
| -out ${CA_LOCATION}/$NEWUSER.crt \ | |
| -days $DAYS_VALID | |
| kubectl --kubeconfig=$KUBECONFIG config set-credentials $NEWUSER \ | |
| --client-certificate=${CA_LOCATION}/$NEWUSER.crt \ | |
| --client-key=${CA_LOCATION}/$NEWUSER.key \ | |
| --embed-certs=true | |
| merge_kubeconfig | |
| echo "Key/certificate has been written to ${CA_LOCATION}/$NEWUSER.{key,crt}" | |
| echo "kubeconfig has been written to $KUBECONFIG" |
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NEWUSER="booboo"; kubeadm alpha kubeconfig user --client-name="$NEWUSER" --cert-dir /etc/kubernetes/pki > kubeconf_${NEWUSER}.conf