Gontainer

Gontainer is a container made for fun and curiosity.

The scope of this project was to better understand Linux namespacing, and apply it to create a rudimental container.

Install

If you have a Go environment ready to go, it's as easy as:

go get github.com/alegrey91/Gontainer

Once you retrieved you are ready to build:

go build github.com/alegrey91/Gontainer

Usage

Typing Gontainer -h the following output will be shown:

Usage: ./Gontainer -run -uid [-mnt=/path/rootfs] [-uts [-hostname=new_hostname]] [-ipc] [-net] [-pid]
  -mnt='/path/rootfs'           Enable Mount namespace
  -uts                          Enable UTS namespace
  -hostname='new_hostname'      Set a custom hostname into the container
  -ipc                          Enable IPC namespace
  -net                          Enable Network namespace
  -pid                          Enable PID namespace
  -uid                          Enable User namespace
  -v                            Check Gontainer version

Below there is a full explanation of provided arguments:

• mnt: Mount namespaces control mount points. Upon creation the mounts from the current mount namespace are copied to the new namespace. The clone flag used to create a new namespace of this type is CLONE_NEWNS. [6]
• uts: UTS namespaces allow a single system to appear to have different host and domain names to different processes. The clone flag used to create a new namespace of this type is CLONE_NEWUTS. [6]
• ipc: IPC namespaces isolate processes from SysV style inter-process communication. This prevents processes in different IPC namespaces from using, for example, the SHM family of functions to establish a range of shared memory between the two processes. The clone flag used to create a new namespace of this type is CLONE_NEWIPC. [6]
• : Network namespaces virtualize the network stack. On creation a network namespace contains only a loopback interface. The clone flag used to create a new namespace of this type is CLONE_NEWNET. [6]