Containers (Still Confusion!??) Chillax !! Unsharing is caring...

Its all about Cgroups and Namespaces:

Lets check it out!!!

Cgroups:

cgroups (abbreviated from control groups) is a Linux kernel feature that limits, accounts for, and isolates the resource usage (CPU, memory, disk I/O, network, etc.) of a collection of processes.

Inshort grouping processes and imposing limits 

Namespaces:
 - Linux kernel primitives,fundamental aspects of containers

Inshort providing isolation to controlled group of processes

• pid (process id)
• mnt(rootfs)
• net(network Stack)
• user(usermapping)
• uts(hostname)
• ipc(processes inside container share all) 

Note:  /proc/$pid/ns is a procfs dir which stores informations about namespaces

References
            https://linuxcontainers.org/lxc/introduction/