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2장. Building and testing RHEL bootc images

You can build and test RHEL container images using Podman and Containerfiles to create, customize, and share bootable RHEL system images across environments efficiently. You can also use other tools, for example, OpenShift Container Platform. For more examples of configuring RHEL systems by using containers, see the rhel-bootc-examples repository.

2.1. Building and configuring bootc-based images from a Containerfile
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You can use a Containerfile to build and customize your own bootc-based image with the tools, configurations, and applications you need. While most standard instructions work, some are ignored when the image is installed on a system.

그림 2.1. Building an image by using instructions from a Containerfile, testing the container, pushing an image to a registry, and sharing it with others

639 RHEL Bootable Container Bifrost 0524 2

A general Containerfile structure is the following: 

FROM registry.redhat.io/rhel10/rhel-bootc:latest

RUN dnf -y install [software] [dependencies] && dnf clean all

ADD [application]
ADD [configuration files]

RUN [config scripts]

The available commands that are usable inside a Containerfile and a Dockerfile are equivalent.

However, the following commands in a Containerfile are ignored when the rhel-10-bootc image is installed to a system:

  • ENTRYPOINT and CMD (OCI: Entrypoint/Cmd): you can set CMD /sbin/init instead.
  • ENV (OCI: Env): change the systemd configuration to configure the global system environment.
  • EXPOSE (OCI: exposedPorts): it is independent of how the system firewall and network function at runtime.
  • USER (OCI: User): configure individual services inside the RHEL bootc to run as unprivileged users instead.

The rhel-10-bootc container image reuses the OCI image format.

  • The rhel-10-bootc container image ignores the container config section (Config) when it is installed to a system.
  • The rhel-10-bootc container image does not ignore the container config section (Config) when you run this image by using container runtimes such as podman or docker.
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