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kubectl-kubeconfig-generate
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kubectl-kubeconfig-generate
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#!/bin/bash
set -e
set -o pipefail
SERVICE_ACCOUNT_NAME="jovianx-admin"
NAMESPACE="jovianx-system"
CONTEXT=""
ROLE="cluster-admin"
UPLOAD_URL="https://hub.jovianx.app"
UPLOAD_AUTH_TOKEN=""
TARGET_FOLDER="/tmp/kube"
KUBECFG_FILE_NAME="kubeconfig-${SERVICE_ACCOUNT_NAME}-${NAMESPACE}.yaml"
KUBECFG_FILE_PATH="$TARGET_FOLDER/$KUBECFG_FILE_NAME"
OUTPUT_FILE="./$KUBECFG_FILE_NAME"
DEBUG=false
HELP_TEXT="
Generate a token-based (authentication via kubernetes service-account token) Kubeconfig file,
based on configured kubeconfig context.
Available parameters:
--output-file Path to creating Kubernetes configuration file.
Default: '$OUTPUT_FILE'.
--context Name of existing context to use during generation of a
new kubeconfig file. Defaults to current context of existing
configuration.
--service-account Name of service account. Defaults to '$SERVICE_ACCOUNT_NAME'.
--role Name of role during creation of cluster role binding.
Defaults to '$ROLE'.
--namespace Name of namespace where to service account will be
created. Defaults to '$NAMESPACE'.
--jwt-token JWT token to authenticate on configuration upload. If
provided the generated kubeconfig file will be uploaded to
JovianX Service Hub. Note: when set the kubeconfig file
is not saved locally.
--jovianx-url JovianX host URL. Defaults to: '$UPLOAD_URL'
--debug if this flag set additional output is provided.
--help Print this message.
"
create_target_directory() {
[[ $DEBUG == true ]] && printf "%s" "Creating target directory to hold files in '${TARGET_FOLDER}'... "
mkdir -p "${TARGET_FOLDER}"
[[ $DEBUG == true ]] && printf "%s\n" "Done"
return 0
}
test_current_kubeconfig() {
[[ $DEBUG == true ]] && printf "%s" "Trying to get resoruces using current Kubeconfig... "
if [[ "$DEBUG" == true ]]; then
kubectl get pods --all-namespaces
else
kubectl get pods --all-namespaces > /dev/null
fi
[[ $DEBUG == true ]] && printf "%s\n" "Done"
return 0
}
test_generated_kubeconfig() {
[[ $DEBUG == true ]] && printf "%s" "Trying to get resources using generated Kubeconfig... "
if [[ "$DEBUG" == true ]]; then
KUBECONFIG=${OUTPUT_FILE} kubectl get pods --all-namespaces
else
KUBECONFIG=${OUTPUT_FILE} kubectl get pods --all-namespaces > /dev/null
fi
[[ $DEBUG == true ]] && printf "%s\n" "Done"
return 0
}
create_namespace() {
[[ $DEBUG == true ]] && printf "%s" "Creating namespace ${NAMESPACE}... "
if [[ "$DEBUG" == true ]]; then
kubectl create namespace "${NAMESPACE}"
else
kubectl create namespace "${NAMESPACE}" 2> /dev/null
fi
[[ $DEBUG == true ]] && printf "%s\n" "Done"
return 0
}
create_service_account() {
[[ $DEBUG == true ]] && printf "%s" "Creating a service account '${SERVICE_ACCOUNT_NAME}' in '${NAMESPACE}' namespace... "
if [[ "$DEBUG" == true ]]; then
kubectl create sa "${SERVICE_ACCOUNT_NAME}" --namespace "${NAMESPACE}"
else
kubectl create sa "${SERVICE_ACCOUNT_NAME}" --namespace "${NAMESPACE}" 2> /dev/null
fi
[[ $DEBUG == true ]] && printf "%s\n" "Done"
return 0
}
create_cluster_role_binding() {
[[ $DEBUG == true ]] && printf "%s" "Creating a cluster role binding cluster-admin... "
user="system:serviceaccount:${NAMESPACE}:${SERVICE_ACCOUNT_NAME}"
if [[ "$DEBUG" == true ]]; then
kubectl create clusterrolebinding jovianx-cluster-admin-binding --clusterrole "$ROLE" --user $user
else
kubectl create clusterrolebinding jovianx-cluster-admin-binding --clusterrole "$ROLE" --user $user 2> /dev/null
fi
[[ $DEBUG == true ]] && printf "%s\n" "Done"
return 0
}
extract_ca_crt() {
[[ $DEBUG == true ]] && printf "%s" "Extracting ca.crt from secret... "
kubectl get cm --namespace "${NAMESPACE}" kube-root-ca.crt -o json | jq \
-r '.data["ca.crt"]' > "${TARGET_FOLDER}/ca.crt"
[[ $DEBUG == true ]] && printf "%s\n" "Done"
return 0
}
get_user_token() {
[[ $DEBUG == true ]] && printf "%s" "Getting user token from secret... "
#USER_TOKEN=$(kubectl get secret --namespace "${NAMESPACE}" "${SECRET_NAME}" -o json | jq -r '.data["token"]' | base64 -d)
USER_TOKEN=$(kubectl create token "${SERVICE_ACCOUNT_NAME}" --namespace="${NAMESPACE}")
[[ $DEBUG == true ]] && printf "%s\n" "Done"
return 0
}
set_kube_config_values() {
if [[ -z "$CONTEXT" ]]; then
[[ $DEBUG == true ]] && printf "%s" "No context was provided. Getting context... "
CONTEXT=$(kubectl config current-context)
[[ $DEBUG == true ]] && printf "%s\n" "Context: ${CONTEXT}"
fi
[[ $DEBUG == true ]] && printf "%s" "Getting cluster name... "
CLUSTER_NAME=$(kubectl config get-contexts "$CONTEXT" | awk '{print $3}' | tail -n 1)
[[ $DEBUG == true ]] && printf "%s\n" "Cluster name: ${CLUSTER_NAME}"
[[ $DEBUG == true ]] && printf "%s" "Getting endpoint... "
ENDPOINT=$(kubectl config view -o jsonpath="{.clusters[?(@.name == \"${CLUSTER_NAME}\")].cluster.server}")
[[ $DEBUG == true ]] && printf "%s\n" "Endpoint: ${ENDPOINT}"
# Set up the config
[[ $DEBUG == true ]] && printf "%s" "Assembling Kubernetes configuration. Setting a cluster entry... "
if [[ "$DEBUG" == true ]]; then
kubectl config set-cluster "${CLUSTER_NAME}" \
--kubeconfig="${KUBECFG_FILE_PATH}" \
--server="${ENDPOINT}" \
--certificate-authority="${TARGET_FOLDER}/ca.crt" \
--embed-certs=true
else
kubectl config set-cluster "${CLUSTER_NAME}" \
--kubeconfig="${KUBECFG_FILE_PATH}" \
--server="${ENDPOINT}" \
--certificate-authority="${TARGET_FOLDER}/ca.crt" \
--embed-certs=true > /dev/null
fi
[[ $DEBUG == true ]] && printf "%s\n" "Done"
[[ $DEBUG == true ]] && printf "%s" "Assembling Kubernetes configuration. Setting token credentials entry... "
if [[ "$DEBUG" == true ]]; then
kubectl config set-credentials \
"${SERVICE_ACCOUNT_NAME}-${NAMESPACE}-${CLUSTER_NAME}" \
--kubeconfig="${KUBECFG_FILE_PATH}" \
--token="${USER_TOKEN}"
else
kubectl config set-credentials \
"${SERVICE_ACCOUNT_NAME}-${NAMESPACE}-${CLUSTER_NAME}" \
--kubeconfig="${KUBECFG_FILE_PATH}" \
--token="${USER_TOKEN}" > /dev/null
fi
[[ $DEBUG == true ]] && printf "%s\n" "Done"
[[ $DEBUG == true ]] && printf "%s" "Assembling Kubernetes configuration. Setting a context entry... "
if [[ "$DEBUG" == true ]]; then
kubectl config set-context \
"${SERVICE_ACCOUNT_NAME}-${NAMESPACE}-${CLUSTER_NAME}" \
--kubeconfig="${KUBECFG_FILE_PATH}" \
--cluster="${CLUSTER_NAME}" \
--user="${SERVICE_ACCOUNT_NAME}-${NAMESPACE}-${CLUSTER_NAME}" \
--namespace="${NAMESPACE}"
else
kubectl config set-context \
"${SERVICE_ACCOUNT_NAME}-${NAMESPACE}-${CLUSTER_NAME}" \
--kubeconfig="${KUBECFG_FILE_PATH}" \
--cluster="${CLUSTER_NAME}" \
--user="${SERVICE_ACCOUNT_NAME}-${NAMESPACE}-${CLUSTER_NAME}" \
--namespace="${NAMESPACE}" > /dev/null
fi
[[ $DEBUG == true ]] && printf "%s\n" "Done"
[[ $DEBUG == true ]] && printf "%s" "Assembling Kubernetes configuration. Setting the current-context... "
if [[ "$DEBUG" == true ]]; then
kubectl config use-context "${SERVICE_ACCOUNT_NAME}-${NAMESPACE}-${CLUSTER_NAME}" \
--kubeconfig="${KUBECFG_FILE_PATH}"
else
kubectl config use-context "${SERVICE_ACCOUNT_NAME}-${NAMESPACE}-${CLUSTER_NAME}" \
--kubeconfig="${KUBECFG_FILE_PATH}" > /dev/null
fi
[[ $DEBUG == true ]] && printf "%s\n" "Done"
return 0
}
copy_generated_kubeconfig() {
[[ $DEBUG == true ]] && printf "%s" "Copying kubeconfig file to current directory and removing temporary working directory... "
cp "$KUBECFG_FILE_PATH" "$OUTPUT_FILE"
rm -Rf ${TARGET_FOLDER}
[[ $DEBUG == true ]] && printf "%s\n" "Done"
return 0
}
delete_generated_kubeconfig() {
[[ $DEBUG == true ]] && printf "%s" "Deleting kubeconfig file to current directory and removing temporary working directory... "
rm -Rf ${TARGET_FOLDER}
[[ $DEBUG == true ]] && printf "%s\n" "Done"
return 0
}
upload_configuration() {
[[ $DEBUG == true ]] && printf "%s" "Uploading configuration to JovianX Service Hub... "
UPLOAD_ENDPOINT="$UPLOAD_URL/api/v1/organization/kubernetes-configuration"
if [[ -z "$UPLOAD_AUTH_TOKEN" ]]; then
printf "%s\n" "Upload authentication token was not provided."
exit 1
fi
FILE_CONTENT=$(yq --output-format=json eval "${KUBECFG_FILE_PATH}")
if [[ "$DEBUG" == true ]]; then
curl --silent --show-error --write-out 'Server status code: %{http_code}\n' -X 'POST' "$UPLOAD_ENDPOINT" \
-H 'accept: application/json' \
-H "Authorization: Bearer $UPLOAD_AUTH_TOKEN" \
-H 'Content-Type: application/json' \
-d "$FILE_CONTENT"
else
response_code=$(curl --write-out '%{http_code}' --output /dev/null --silent -X 'POST' "$UPLOAD_ENDPOINT" \
-H 'accept: application/json' \
-H "Authorization: Bearer $UPLOAD_AUTH_TOKEN" \
-H 'Content-Type: application/json' \
-d "$FILE_CONTENT")
if [[ "$response_code" != "200" ]]; then
printf "%s\n" "Failed to upload configuration. Server response code is '$response_code'."
exit 1
else
printf "%s\n" "Successfully uploaded configuration."
fi
fi
[[ $DEBUG == true ]] && printf "%s\n" "Done"
return 0
}
while test $# -gt 0; do
case "$1" in
(--debug)
DEBUG=true
shift
;;
(--output-file)
shift
if test $# -gt 0; then
OUTPUT_FILE="$1"
else
printf "%s\n" "$HELP_TEXT"
exit 1
fi
shift
;;
(--output-file*)
OUTPUT_FILE=`echo $1 | sed -e 's/^[^=]*=//g'`
shift
;;
(--context)
shift
if test $# -gt 0; then
CONTEXT="$1"
else
printf "%s\n" "$HELP_TEXT"
exit 1
fi
shift
;;
(--context*)
CONTEXT=`echo $1 | sed -e 's/^[^=]*=//g'`
shift
;;
(--namespace)
shift
if test $# -gt 0; then
NAMESPACE="$1"
else
printf "%s\n" "$HELP_TEXT"
exit 1
fi
shift
;;
(--namespace*)
NAMESPACE=`echo $1 | sed -e 's/^[^=]*=//g'`
shift
;;
(--role)
shift
if test $# -gt 0; then
ROLE="$1"
else
printf "%s\n" "$HELP_TEXT"
exit 1
fi
shift
;;
(--role*)
ROLE=`echo $1 | sed -e 's/^[^=]*=//g'`
shift
;;
(--service-account)
shift
if test $# -gt 0; then
SERVICE_ACCOUNT_NAME="$1"
else
printf "%s\n" "$HELP_TEXT"
exit 1
fi
shift
;;
(--service-account*)
SERVICE_ACCOUNT_NAME=`echo $1 | sed -e 's/^[^=]*=//g'`
shift
;;
(--jovianx-url)
shift
if test $# -gt 0; then
UPLOAD_URL="$1"
else
printf "%s\n" "$HELP_TEXT"
exit 1
fi
shift
;;
(--jovianx-url*)
UPLOAD_URL=`echo $1 | sed -e 's/^[^=]*=//g'`
shift
;;
(--jwt-token)
shift
if test $# -gt 0; then
UPLOAD_AUTH_TOKEN="$1"
else
printf "%s\n" "$HELP_TEXT"
exit 1
fi
shift
;;
(--jwt-token*)
UPLOAD_AUTH_TOKEN=`echo $1 | sed -e 's/^[^=]*=//g'`
shift
;;
(--help)
printf "%s\n" "$HELP_TEXT"
exit 0
;;
*)
printf '%s\n' "Unknown argument $1."
printf "%s\n" "$HELP_TEXT"
exit 1
;;
esac
done
test_current_kubeconfig
create_target_directory
create_namespace || true
create_service_account || true
create_cluster_role_binding || true
extract_ca_crt
get_user_token
set_kube_config_values
if [[ -n "$UPLOAD_AUTH_TOKEN" ]]; then
upload_configuration
delete_generated_kubeconfig
else
copy_generated_kubeconfig
test_generated_kubeconfig
printf "%s\n" "Kubernetes configuration saved to: $OUTPUT_FILE"
fi