5.11. Building RHEL images by using the real-time kernel

Procedure

1. Create a kernel.json file to include the RT kernel repository:

       {
         "name": "kernel-rt",
         "baseurl": "https://cdn.redhat.com/content/dist/rhel10/10/x86_64/rt/os",
         "gpgkey": "-----BEGIN PGP PUBLIC KEY BLOCK-----\n\nmQINBEr………fg==\n=UZd/\n-----END PGP PUBLIC KEY BLOCK-----\n",
         "rhsm": true,
         "check_gpg": true
       },

2. Create a blueprint. In the blueprint, add the "[customizations.kernel]" customization. The following is an example that contains the "[customizations.kernel]" in the blueprint:

   name = "rt-kernel-image"
   description = ""
   version = "2.0.0"
   modules = []
   groups = []
   distro = "rhel-10.0"
   [[customizations.user]]
   name = "admin"
   password = "admin"
   groups = ["users", "wheel"]
   [customizations.kernel]
   name = "kernel-rt"
   append = ""

3. Build your image from the blueprint you created. The following example builds a .qcow2 image:

   # image-builder build qcow2 -- blueprint rt-kernel-image --data-dir kernel.json

4. Deploy the image that you built to the system where you want to use the real-time kernel features.