Chapter 32. Red Hat Enterprise Linux Atomic Host 7.3.4

Ability to generate initramfs on the client

By default, Atomic Host uses a generic initramfs image built on the server side. This is distinct from the yum-based Red Hat Enterprise Linux, where initramfs is generated for each installation. However, in some situations, additional configuration or content may need to be added, which requires generating initramfs on the client side.

With this update, the Atomic Host component rpm-ostree, which is used for updates of the host, has the new initramfs command. The new command allows generating initramfs on the client side using the dracut program.

For details on using rpm-ostree initramfs, see Generating the initramfs Image on the Client in the Installation and Configuration Guide.

The managed plugin API changed in docker-latest

In Docker 1.13, the managed plugin API changed compared to the experimental version introduced in Docker 1.12. Before upgrading to Docker 1.13, you must uninstall plugins that you installed with Docker 1.12. To uninstall plugins, use the docker plugin rm command.

If you have already upgraded to Docker 1.13 without uninstalling previously installed plugins, you may see this message when the Docker daemon starts:

Error starting daemon: json: cannot unmarshal string into Go value of type
types.PluginEnv

To resolve this problem: