# ls -alh /var/lib/docker/containers/*/*-json.log

# docker inspect app-proxy-1 | grep -i log
        "LogPath": "/var/lib/docker/containers/415a09895929c250e05f2ec463c2affc144166884a93b1591e8cd2a884b86a7a/415a09895929c250e05f2ec463c2affc144166884a93b1591e8cd2a884b86a7a-json.log",
            "LogConfig": {

# truncate -s 0 /var/lib/docker/containers/415a09895929c250e05f2ec463c2affc144166884a93b1591e8cd2a884b86a7a/415a09895929c250e05f2ec463c2affc144166884a93b1591e8cd2a884b86a7a-json.log

services:
  app:
    logging:
      driver: "json-file"
      options:
        max-size: "10m"
        max-file: "3"

{
   "log-driver": "json-file",
   "log-opts": {"max-size": "10m", "max-file": "3"}
}