z/OS 2.4 which was previewed in February of 2019 contains a new feature called Container Extensions.  It is entitled with z/OS 2.4 which means it is part of the z/OS deliverable.  It gives you the ability to run any Linux on z Docker container on z/OS.  It runs in a started task in an address space just like any other middleware service on z/OS.  This means it fits into your existing system without requiring the definition of a new LPAR (logical partition) and can use the hardware that the existing z/OS is using.  This means you don’t need to define new networking hardware, or new disk.

You can read more about it here – https://www.ibm.com/support/z-content-solutions/container-extensions/

I made a short video here https://youtu.be/xOuoTqaBqqU

There is also a podcast here http://terminaltalk.net/PodcastGenerator/?name=gary_puchkoff_-_z_os_container_extensions.mp3

A couple articles as well http://ibmsystemsmag.com/mainframe/trends/z-os/z-cx/ and http://ibmsystemsmag.com/mainframe/hot-topics/container-extensions-faq/

I will write more about z/OS 2.4 once we announce the GA.