The tool wraps apps in a portable, lightweight run-time that can execute on laptops, desktops, servers, clusters, hypervisors and even bare metal. Docker can be used to package and automate deployment of applications, databases and back-end systems. Docker is also now part of Red Hat's OpenShift Platform-as-a-Service product.
Expected sometime later this year, RHEL 7 will incorporate Fedora 19 and be built around Linux kernel 3.10, the upstream kernel released last June that added support for timerless multitasking, block caching from SSDs and the ARM mixed-CPU architecture. It also changes the default file system to XFS, which supports hard drive volumes as large as 500 TB and integrates with Active Directory. In beta since December, the release candidate was made available on April 15