--- version: "3.8" services: app: environment: - SSH_KEY_FILE=/run/secrets/ssh_key - SSH_HOST_KEY secrets: - source: ssh_key mode: 0400 configs: - source: ssh_config target: /root/.ssh/config secrets: ssh_key: external: true name: ${STACK_NAME}_ssh_key_${SECRET_SSH_KEY_VERSION} configs: ssh_config: name: ${STACK_NAME}_ssh_config_${SSH_CONFIG_VERSION} file: ssh_config