version: "3.9" services: tailscale: build: context: ../../images/tailscale environment: TAILSCALE_AUTH_KEY: ${TAILSCALE_AUTH_KEY:?err} TAILSCALE_HOSTNAME: ${TAILSCALE_HOSTNAME:-tailscale-docker-simple-example} TAILSCALE_STATE_ARG: "mem:" some-service-1: image: nginxdemos/hello network_mode: "service:tailscale"