Before you start this recipe, prepare a Docker hub account (https://hub.docker.com) or you may use your private registry that is described in the previous section. But the important part is you must have a credential to pull and push to the registry. If you use Docker hub, make sure docker login with your credentials works.
Next, make sure your Kubernetes is ready. But we will use RBAC authentication for access from the Jenkins pod to the Kubernetes master API. If you use minikube, you need to add the --extra-config=apiserver.Authorization.Mode=RBAC option when starting a minikube:
//enable RBAC and allocate 8G memory
$ minikube start --memory=8192 --extra-config=apiserver.Authorization.Mode=RBAC
Then, you can set up your own Jenkins server through Kubernetes as well; the details are in this section.
Some minikube versions have a kube-dns issue that can't resolve the external domain name, such as https://github.com/ and https://jenkins.io/, that can't process this recipe. Replacing the kube-dns add-on with the coredns add-on could resolve the issue after launching minikube with the following command:
$ minikube addons disable kube-dns
$ minikube addons enable coredns
$ minikube addons disable kube-dns
$ minikube addons enable coredns