Lets say you're hosting servers for your customers and those customers have SSH access. Eventually that customer might lose/share its credentials and you end up with a potential security hazard. There are many possible hazards, but today we focus on that one available on Docker servers.
Security is usually not open to the wide audience, simply because hackers or the people trying to fend them, are not profiting from a wider audience with knowledge about the trade. This blog will explain the inner workings of one aspect of security.