rhcos-kaio

The project generates an ignition file that, when injected into RHCOS, creates an all-in-one Kubernetes cluster

Latest RHCOS Images https://mirror.openshift.com/pub/openshift-v4/dependencies/rhcos/4.3/latest/

Prereqs

• openssl
• cfssl

Usage

• cp base.ign.example base.ign and edit base.ign with your ssh key
• update EXTERNAL_API_HOSTNAME in make-pki.sh to the DNS name of your AIO (this is so the apiserver cert can include that name and the admin.kubeconfig will contact the apiserver at this name)
• run make-ignition to create the final.ign file
• inject the final.ign into an RHCOS machine directly, or use bootstrap-append.ign.example to append the ignition file from another host if the injection mechanism does not allow large files.

Follow Up

• from the repo root, KUBECONFIG=$PWD/fake-root/var/lib/kubernetes/admin.kubeconfig
• run oc get nodes to make sure you can access the AIO
• create the CoreDNS deployment with oc apply -f coredns.yaml
• verify the deployment is Running with oc get pod -n kube-system

Clean up

make-ignition.sh will reuse certs if they already exist in fake-root/var/lib/kubernetes. To start clean, rm -rf fake-root/var/lib/kubernetes final.ign.