+
+function docker_install {
+ local image_dir=$1
+ # Mininum effort attempt at installing Docker if missing
+ if ! docker --version; then
+ curl -fsSL https://get.docker.com -o get-docker.sh
+ sudo sh get-docker.sh
+ rm get-docker.sh
+ # On RHEL distros, the Docker service should be explicitly started
+ sudo systemctl start docker
+ else
+ DOCKER_VER=$(docker version --format '{{.Server.Version}}')
+ if [ "${DOCKER_VER%%.*}" -lt 2 ]; then
+ notify_e "[ERROR] Docker version ${DOCKER_VER} is too old, please upgrade it."
+ fi
+ fi
+ # Distro-provided docker-compose might be simply broken (Ubuntu 16.04, CentOS 7)
+ COMPOSE_BIN="${image_dir}/docker-compose"
+ COMPOSE_VERSION='1.22.0'
+ notify_n "[WARN] Using docker-compose ${COMPOSE_VERSION} in ${COMPOSE_BIN}" 3
+ if [ ! -e "${COMPOSE_BIN}" ]; then
+ COMPOSE_URL="https://github.com/docker/compose/releases/download/${COMPOSE_VERSION}"
+ sudo curl -L "${COMPOSE_URL}/docker-compose-$(uname -s)-$(uname -m)" -o "${COMPOSE_BIN}"
+ sudo chmod +x "${COMPOSE_BIN}"
+ fi
+}