sudo docker logs --tail 20 -f container id
https://systorage.tistory.com/entry/Docker-docker-%ED%8A%B9%EC%A0%95-container%EC%9D%98-%EB%A1%9C%EA%B7%B8-%EC%8B%A4%EC%8B%9C%EA%B0%84-%ED%99%95%EC%9D%B8%ED%95%98%EA%B8%B0