krew VS kubelogin

Authenticating with Kyma is a (in my opinion) unnecessary challenge as it leverages the OIDC-login plugin for kubectl. You find a description of the setup here. This works fine when on a Mac but can give you some headaches on a Windows and on Linux machine especially when combined with restrictive setups in corporate environments. For Windows I can only recommend installing krew via chocolatey and then install the OIDC plugin via kubectl krew install oidc-login. At least for me that was the only way to get this working on Windows.

( set -x; cd "$(mktemp -d)" && OS="$(uname | tr '[:upper:]' '[:lower:]')" && ARCH="$(uname -m | sed -e 's/x86_64/amd64/' -e 's/\(arm\)\(64\)\?.*/\1\2/' -e 's/aarch64$/arm64/')" && KREW="krew-${OS}_${ARCH}" && curl -fsSLO "https://github.com/kubernetes-sigs/krew/releases/download/v0.4.4/krew-linux_amd64.tar.gz" && tar zxvf "${KREW}.tar.gz" && ./"${KREW}" install krew )

Krew is a way to manage plugins for Kubernetes. For more info, check out the following link: https://krew.sigs.k8s.io/

I plan on getting it added as a krew plugin, so watch this space.

Krew is a plugin manager maintained by the Kubernetes Special Interest Group (SIG) CLI community. Krew makes it easy to use kubectl plugins and helps you discover, install, and manage them on your machine. It is similar to tools like apt, dnf, or brew. Today, over 200 kubectl plugins are available on Krew - and that number is only increasing. Some projects are actively used and some get deprecated over time, but are still accessible via Krew.

kubectl plugins can be installed in numerous ways, the easiest way would be to install the official plugin manager called krew.

( set -x; cd "$(mktemp -d)" && OS="$(uname | tr '[:upper:]' '[:lower:]')" && ARCH="$(uname -m | sed -e 's/x86_64/amd64/' -e 's/\(arm\)\(64\)\?.*/\1\2/' -e 's/aarch64$/arm64/')" && KREW="krew-${OS}_${ARCH}" && curl -fsSLO "https://github.com/kubernetes-sigs/krew/releases/latest/download/${KREW}.tar.gz" && tar zxvf "${KREW}.tar.gz" && ./"${KREW}" install krew )

-- What is Krew?

Authenticating with Kyma is a (in my opinion) unnecessary challenge as it leverages the OIDC-login plugin for kubectl. You find a description of the setup here. This works fine when on a Mac but can give you some headaches on a Windows and on Linux machine especially when combined with restrictive setups in corporate environments. For Windows I can only recommend installing krew via chocolatey and then install the OIDC plugin via kubectl krew install oidc-login. At least for me that was the only way to get this working on Windows.

It is sort of a roundabout way, but I sync Active Directory to a Keycloak realm, then use OIDC auth with kube-oidc-proxy (https://github.com/jetstack/kube-oidc-proxy) and kubelogin (https://github.com/int128/kubelogin) for OIDC-based auth to the api server.

Yes, I setup a cluster with no SPFs. That means an HA setup for the external load balancer. I use HAProxy for my ELB, and setup 2 instances with a VRRP + keepalived to provide HA to the ingress controller. I run the control plane private, accessible only from localhost. I setup kube-oidc-proxy (https://github.com/jetstack/kube-oidc-proxy) to expose the API server with single sign-on on the ingress controller, and use the kubelogin plugin (https://github.com/int128/kubelogin) to provide OIDC support to kubectl. I then setup Keycloak to handle OIDC/OAuth2/SAML and syncing to Active Directory, and setup groups in Active Directory to control acccess to clusters. Devs each get their own namespace in the dev cluster, with mostly cluster-admin access to their namespace. Staging/Prod clusters are locked down, with read-only access to devs. Thanks to the OIDC auth to the APIServer, when employees are onboarded & offboarded, we only need to add/remove them from groups in Active Directory and everything else just magically syncs.

I've successfully configured kube-apiserver to authenticate users through oidc (https://github.com/int128/kubelogin) so all the users from my keycloak realm can access to the cluster with their credentials.

Link to GitHub Repository

kubelogin (helper for k8s build in OIDC support)

I use the kube-login plugin for kubectl (https://github.com/int128/kubelogin) along with the kube-oidc-proxy (https://github.com/jetstack/kube-oidc-proxy), using Keycloak as my OIDC provider (https://www.keycloak.org) and doing LDAP synchronization to Active Directory.

Dex oauth and kubelogin. We happen to use google auth in our org, but dex is pretty flexible. You only have to have a way to distribute server certificates. We then have documented script commands to pull certs and create kubectl fig files. OpenUnison always looked interesting, but dex has been good enough for our uses.

With a working dex/OIDC configuration, you could use: https://github.com/int128/kubelogin