root@host:~/sites# docker exec -it memcached ps ax
PID USER TIME COMMAND
1 memcache 19:05 memcached -u memcached -m 512
15 root 0:00 ps ax
root@host:~/sites# docker exec -it nginx ps ax
PID TTY STAT TIME COMMAND
1 ? Ss 0:00 nginx: master process nginx -g daemon off;
6 ? Sl 14:59 nginx: worker process
7 ? Sl 0:47 nginx: worker process
22 pts/0 Rs+ 0:00 ps ax