root@server:~/docker# docker container ls
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                  NAMES
862795b066d8        nginx               "nginx -g 'daemon ..."   23 seconds ago      Up 21 seconds       0.0.0.0:9000->80/tcp   hardcore_brattain
root@server:~/docker# docker container exec 86 ls /usr/share/nginx/html
50x.html
index.html