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Chapter 6. Best practices for running containers by using local sources

You can access content hosted in an internal registry that requires a custom Transport Layer Security (TLS) root certificate, when running RHEL bootc images.

To install content to a container by using only local resources, you can use one of the following options:

  • Bind mounts: Override the container’s store with the host’s.
  • Derived image: Create a new container image with your custom certificates by building it using a Containerfile.

You can use these techniques to run a bootc-image-builder container or a bootc container when appropriate.

Use bound mounts to override the container’s store with the host’s.

Procedure

  • Run RHEL bootc image and use bind mount, for example -v /etc/pki:/etc/pki, to override the container’s store with the host’s: 

    # podman run \
  --rm \
  -it \
  --privileged \
  --pull=newer \
  --security-opt label=type:unconfined_t \
  -v $(pwd)/output:/output \
  -v /etc/pki:/etc/pki \
  localhost/<image> \
  --type iso \
  --config /config.toml \
  quay.io/<namespace>/<image>:<tag>

Verification

  • The disk image build process should now be able to access internal certificates.

Create a new container image with your custom certificates by building it using a Containerfile.

Procedure

  1. Create a Containerfile: 

    FROM <internal_repository>/<image>
RUN  mkdir -p /etc/pki/ca-trust/extracted/pem/
COPY tls-ca-bundle.pem /etc/pki/ca-trust/extracted/pem/
RUN  rm -rf /etc/yum.repos.d/*
COPY echo-rhel9_4.repo /etc/yum.repos.d/

  2. Build the custom image: 

    # podman build -t <your_image> .

  3. Run the <your_image>: 

    # podman run -it --rm <your_image>

Verification

  • List the certificates inside the container: 

    # ls -l /etc/pki/ca-trust/extracted/pem/
tls-ca-bundle.pem
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