Chapter 37. Red Hat Enterprise Linux Atomic Host 7.2.7

docker-latest has been upgraded to version 1.12.1

The docker-latest packages are now version 1.12.1. The following article has been updated to reflect the changes Introducing docker-latest for RHEL 7 and RHEL Atomic Host.

docker 1.12 uses runc as a runtime environment

Since docker version 1.11, runc is used instead of libcontainer for container runtime. The docker-latest packages contain 1.12, and runc can be found in /usr/libexec/docker/docker-runc. However, docker-runc is for internal use only by docker. If you want to use the runc command, you still need the runc package installed on your system. For RHEL Atomic Host, it is part of the OSTree by default, and for Red Hat Enterprise Linux 7, it is available as a separate package.

docker swarm is now available

As of 1.12 release, the upstream Docker project has embedded Docker Swarm in the docker binary. To avoid any unintended bugs, Red Hat has chosen to include Swarm as an unsupported add-on. For container orchestration, Red Hat recommends OpenShift and Kubernetes.