title: How can i lock docker container ?
body: <p>Yesterday suddenly my containers vanished from my machine. I knew some of the my mates have done something in machine. In any case, I don't want this to happen again. 
  Even, I have gone through few forums to resolve this issue and seen people mentioned about <strong>"docker lock contianer_id"</strong> but its not working as they mentioned. Hence, i like to know exact command or the way to protect my containers from accidental deletion. Please assist me</p>