Dockerのログまわりのドキュメントを読んでいて、ちょっと気になったところがありまして。 View logs for a container or service | Docker Documentation The official nginx image creates a symbolic link from /var/log/nginx/access.log to /dev/stdout, and creates another symbolic link from /var/log/nginx/error.log to /dev/stderr, overwriting the log files and causing logs to be sent to the relevant special device instead. See the Dockerfile. 「doc