version: '2.3' services: proxy: image: squidproxy build: context: . dockerfile: Dockerfile healthcheck: test: ["CMD", "sh", "-exc", "squidclient -T 3 mgr:info 2> /dev/null | grep -qF '200 OK'"] interval: 5s timeout: 3s retries: 5 start_period: 1s sut: image: squidproxy links: - proxy depends_on: - proxy command: sh -exc "sleep 10 && squidclient -h proxy -T 3 'https://postman-echo.com/get?squidtest=ok' 2> /dev/null | grep -qF '200 OK'"