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ContainerImage.Pinniped/doc/demo.md

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Trying Pinniped

Prerequisites

  1. A Kubernetes cluster of a type supported by Pinniped as described in doc/architecture.md.

    Don't have a cluster handy? Consider using kind on your local machine. See below for an example of using kind.

  2. An identity provider of a type supported by Pinniped as described in doc/architecture.md.

    Don't have an identity provider of a type supported by Pinniped handy? Start by installing local-user-authenticator on the same cluster where you would like to try Pinniped by following the directions in deploy-local-user-authenticator/README.md. See below for an example of deploying this on kind.

  3. A kubeconfig where the current context points to the cluster and has admin-like privileges on that cluster.

Steps

Overview

Installing and trying Pinniped on any cluster will consist of the following general steps. See the next section below for a more specific example of installing onto a local kind cluster, including the exact commands to use for that case.

  1. Install Pinniped. See deploy/README.md.
  2. Download the Pinniped CLI from Pinniped's github Releases page.
  3. Generate a kubeconfig using the Pinniped CLI. Run pinniped get-kubeconfig --help for more information.
  4. Run kubectl commands using the generated kubeconfig. Pinniped will automatically be used for authentication during those commands.

Steps to Deploy the Latest Release on kind Using local-user-authenticator as the Identity Provider

  1. Install the tools required for the following steps.

    • Install kind, if not already installed. e.g. brew install kind on MacOS.

    • kind depends on Docker. If not already installed, install Docker, e.g. brew cask install docker on MacOS.

    • This demo requires kubectl, which comes with Docker, or can be installed separately.

    • This demo requires a tool capable of generating a bcrypt hash in order to interact with the webhook. The example below uses htpasswd, which is installed on most macOS systems, and can be installed on some Linux systems via the apache2-utils package (e.g., apt-get install apache2-utils).

    • One of the steps below optionally uses jq to help find the latest release version number. It is not required. Install jq if you would like, e.g. brew install jq on MacOS.

  2. Create a new Kubernetes cluster using kind create cluster. Optionally provide a cluster name using the --name flag. kind will automatically update your kubeconfig to point to the new cluster as a user with admin-like permissions.

  3. Query GitHub's API for the git tag of the latest Pinniped release.

    pinniped_version=$(curl https://api.github.com/repos/vmware-tanzu/pinniped/releases/latest -s | jq .name -r)

    Alternatively, any release version number can be manually selected.

    # Example of manually choosing a release version...
pinniped_version=v0.2.0

  4. Deploy the local-user-authenticator app.

    kubectl apply -f https://github.com/vmware-tanzu/pinniped/releases/download/${pinniped_version}/install-local-user-authenticator.yaml

    The install-local-user-authenticator.yaml file includes the default deployment options. If you would prefer to customize the available options, please see deploy-local-user-authenticator/README.md for instructions on how to deploy using ytt.

  5. Create a test user.

    kubectl create secret generic pinny-the-seal \
  --namespace local-user-authenticator \
  --from-literal=groups=group1,group2 \
  --from-literal=passwordHash=$(htpasswd -nbBC 10 x password123 | sed -e "s/^x://")

  6. Fetch the auto-generated CA bundle for the local-user-authenticator's HTTP TLS endpoint.

    kubectl get secret local-user-authenticator-tls-serving-certificate --namespace local-user-authenticator \
  -o jsonpath={.data.caCertificate} \
  | tee /tmp/local-user-authenticator-ca-base64-encoded

  7. Deploy Pinniped.

     kubectl apply -f https://github.com/vmware-tanzu/pinniped/releases/download/${pinniped_version}/install-pinniped.yaml

    The install-pinniped.yaml file includes the default deployment options. If you would prefer to customize the available options, please see deploy/README.md for instructions on how to deploy using ytt.

  8. Create a WebhookIdentityProvider object to configure Pinniped to authenticate using local-user-authenticator.

    cat <<EOF | kubectl create --namespace pinniped -f -
apiVersion: idp.pinniped.dev/v1alpha1
kind: WebhookIdentityProvider
metadata:
  name: local-user-authenticator
spec:
  endpoint: https://local-user-authenticator.local-user-authenticator.svc/authenticate
  tls:
    certificateAuthorityData: $(cat /tmp/local-user-authenticator-ca-base64-encoded)
EOF

  9. Download the latest version of the Pinniped CLI binary for your platform from Pinniped's latest release.

  10. Move the Pinniped CLI binary to your preferred filename and directory. Add the executable bit, e.g. chmod +x /usr/local/bin/pinniped.

  11. Generate a kubeconfig for the current cluster. Use --token to include a token which should allow you to authenticate as the user that you created above.

    pinniped get-kubeconfig --token "pinny-the-seal:password123" --idp-type webhook --idp-name local-user-authenticator > /tmp/pinniped-kubeconfig

    Note that the above command will print a warning to the screen. You can ignore this warning. Pinniped tries to auto-discover the URL for the Kubernetes API server, but it is not able to do so on kind clusters. The warning is just letting you know that the Pinniped CLI decided to ignore the auto-discovery URL and instead use the URL from your existing kubeconfig.

  12. Try using the generated kubeconfig to issue arbitrary kubectl commands as the pinny-the-seal user.

    kubectl --kubeconfig /tmp/pinniped-kubeconfig get pods -n pinniped

    Because this user has no RBAC permissions on this cluster, the previous command results in the error Error from server (Forbidden): pods is forbidden: User "pinny-the-seal" cannot list resource "pods" in API group "" in the namespace "pinniped". However, this does prove that you are authenticated and acting as the "pinny-the-seal" user.

  13. As the admin user, create RBAC rules for the test user to give them permissions to perform actions on the cluster. For example, grant the test user permission to view all cluster resources.

    kubectl create clusterrolebinding pinny-can-read --clusterrole view --user pinny-the-seal

  14. Use the generated kubeconfig to issue arbitrary kubectl commands as the pinny-the-seal user.

    kubectl --kubeconfig /tmp/pinniped-kubeconfig get pods -n pinniped

    The user has permission to list pods, so the command succeeds this time. Pinniped has provided authentication into the cluster for your kubectl command! 🎉

  15. Carry on issuing as many kubectl commands as you'd like as the pinny-the-seal user. Each invocation will use Pinniped for authentication. You may find it convenient to set the KUBECONFIG environment variable rather than passing --kubeconfig to each invocation.

    export KUBECONFIG=/tmp/pinniped-kubeconfig
kubectl get namespaces
kubectl get pods -A

  16. Profit! 💰