Bash script to configure, start and stop single node MinIO container instance on Docker

minio.sh

#!/bin/bash
# --------------------------------------------------------------------
# [init] Create run dir, env file if they don't exist, then source env
# --------------------------------------------------------------------
init() {
	MINIO_CONTAINER_NAME=$1
	MINIO_RUN_DIR=/data1/run/${MINIO_CONTAINER_NAME}
	MINIO_DATA=${MINIO_RUN_DIR}/data
	MINIO_CERTS=${MINIO_RUN_DIR}/certs
	# create run dir for container instance
	if [ ! -d "${MINIO_RUN_DIR}" ]; then
		echo "Creating MinIO run dir: ${MINIO_RUN_DIR}"
		mkdir -p ${MINIO_DATA}
		mkdir -p ${MINIO_CERTS}
	fi
	# create .env file for container instance
	if [ ! -f ${MINIO_RUN_DIR}/minio.env ]; then
		echo "Creating ${MINIO_RUN_DIR}/minio.env file."
		cat <<-ENV_FILE > ${MINIO_RUN_DIR}/minio.env
			MINIO_HOST_NAME=${MINIO_HOST_NAME:-localhost}
			MINIO_PORT=${MINIO_PORT:-9000}
			MINIO_CONSOLE_PORT=${MINIO_CONSOLE_PORT:-9001}
			MINIO_CONTAINER_NAME=${MINIO_CONTAINER_NAME}
			MINIO_DATA=${MINIO_DATA}
			MINIO_CERTS=${MINIO_CERTS}
			MINIO_USERNAME=${MINIO_USERNAME:-minioadmin}
			MINIO_PASSWORD=${MINIO_PASSWORD:-$(openssl rand -base64 9)}
		ENV_FILE
	fi
	# hydrate env
	source ${MINIO_RUN_DIR}/minio.env 2>/dev/null
}
# --------------------------------------------------------------------
# [certs] Generate self-signed cert to enable TLS for minio server
# --------------------------------------------------------------------
certs() {
	openssl req -new -newkey rsa:4096 \
		-days 365 -nodes -x509 \
		-subj "/CN=${MINIO_HOST_NAME}" \
		-addext "subjectAltName = DNS:${MINIO_HOST_NAME}" \
		-keyout ${MINIO_RUN_DIR}/certs/private.key \
		-out ${MINIO_RUN_DIR}/certs/public.crt 2>/dev/null
}
# -------------------------------------------------------------------
# [run] Start container if it exists otherwise start new container
# -------------------------------------------------------------------
run() {
	# Do nothing if container is aleady running
	if [ $(docker ps -aq -f status=running -f name=${MINIO_CONTAINER_NAME}) ]; then
		echo "Container ${MINIO_CONTAINER_NAME} is already running."
		return
	fi	
	# Start stopped container
	if [ $(docker ps -aq -f status=exited -f name=${MINIO_CONTAINER_NAME}) ]; then
		echo "Starting existing container ${MINIO_CONTAINER_NAME}..."
		docker start ${MINIO_CONTAINER_NAME}
		return
	fi
	# Generate certs for minio server
	echo "Generating certs for ${MINIO_CONTAINER_NAME}"
	certs ${MINIO_CONTAINER_NAME}
	# Start new container
  	echo "Starting new container ${MINIO_CONTAINER_NAME} ${MINIO_USERNAME}:${MINIO_PASSWORD}"
	docker run -d \
		-p ${MINIO_PORT}:${MINIO_PORT} \
		-p ${MINIO_CONSOLE_PORT}:${MINIO_CONSOLE_PORT} \
  		--user $(id -u):$(id -g) \
  		--name ${MINIO_CONTAINER_NAME} \
  		-e MINIO_ROOT_USER=${MINIO_USERNAME} \
  		-e MINIO_ROOT_PASSWORD=${MINIO_PASSWORD} \
  		-e MINIO_SERVER_URL=https://${MINIO_HOST_NAME}:${MINIO_PORT} \
  		-v ${MINIO_DATA}:/data \
  		-v ${MINIO_CERTS}:/run/certs \
  		minio/minio server /data \
  		--console-address ":${MINIO_CONSOLE_PORT}" \
  		--certs-dir "/run/certs/"
}
# -------------------------------------------------------------------
# [stop] Stop MinIO container
# -------------------------------------------------------------------
stop() {
	docker container stop ${MINIO_CONTAINER_NAME}
}
# -------------------------------------------------------------------
# [status] Docker stats
# -------------------------------------------------------------------
status() {
	docker container stats --no-stream ${MINIO_CONTAINER_NAME}
}
# -------------------------------------------------------------------
# [clean] Stop and remove MinIO container.
# -------------------------------------------------------------------
clean() {
	docker container rm --force ${MINIO_CONTAINER_NAME} 2>/dev/null
}
# -------------------------------------------------------------------
# [usage] Print script usage.
# -------------------------------------------------------------------
usage() {
	echo "----------------------------------------------------"	
	echo "Usage: $0 {run|stop|status|clean} NAME"
	echo "----------------------------------------------------"
	echo " $0 run    my-minio-server"
	echo " $0 stop   my-minio-server"
	echo " $0 status my-minio-server"
	echo " $0 clean  my-minio-server"
	echo "----------------------------------------------------"
}
# -------------------------------------------------------------------
# [main] - init and flow
# -------------------------------------------------------------------
main() {
	if [ $# -lt 2 ]; then
		usage
		exit 1
	fi

	init $2
	case "$1" in
		run) run $2 ;;
		stop) stop $2 ;;
		status) status $2 ;;
		clean) clean $2 ;;
		*)
			usage
			exit 1
	esac
}
# -------------------------------------------------------------------
# ENTRYPOINT
# -------------------------------------------------------------------
main $@