MKE user access¶

Download client certificates¶

To use the Docker CLI with MKE, download a client certificate bundle by using the MKE web UI.

1. Navigate to the My Profile page.

2. In the left pane, click Client Bundles and choose New Client Bundle to download the certificate bundle.

Use client certificates¶

Once you’ve downloaded a client certificate bundle to your local computer, you can use it to authenticate your requests.

Navigate to the directory where you downloaded the user bundle, and extract the zip file into a directory. Then use the utility script appropriate for your system:

cd client-bundle && eval "$(<env.sh)"
# Run this from an elevated prompt session
cd client-bundle && env.cmd

The client bundle utility scripts update the environment variables DOCKER_HOST to make your client tools communicate with your MKE deployment, and the DOCKER_CERT_PATH environment variable to use the client certificates that are included in the client bundle you downloaded. The utility scripts also run the kubectl config command to configure kubectl.

To confirm that your client tools are now communicating with MKE, run:

docker version --format '{{.Server.Version}}'
kubectl config current-context

The expected Docker server version starts with ucp/, and the expected kubectl context name starts with ucp_.

You can now use the Docker and kubectl clients to create resources in MKE.

cd client-bundle && docker context import myucp ucp-bundle-$USER.zip"

Client certificates for administrators¶

MKE issues different types of certificates depending on the user:

• User certificate bundles: only allow running docker commands through a MKE manager node.

• Admin user certificate bundles: allow running docker commands on the Mirantis Container Runtime of any node.

Download client certificates by using the REST API¶

You can also download client bundles by using the MKE REST API. In this example, we use curl to make the web requests to the API, jq to parse the responses, and unzip to unpack the zip archive.

To install these tools on an Ubuntu distribution, you can run:

sudo apt-get update && sudo apt-get install curl jq unzip

Then you get an authentication token from MKE and use it to download the client certificates.

# Create an environment variable with the user security token
AUTHTOKEN=$(curl -sk -d '{"username":"<username>","password":"<password>"}' https://<mke-ip>/auth/login | jq -r .auth_token)

# Download the client certificate bundle
curl -k -H "Authorization: Bearer $AUTHTOKEN" https://<mke-ip>/api/clientbundle -o bundle.zip

# Unzip the bundle.
unzip bundle.zip

# Run the utility script.
eval "$(<env.sh)"

# Confirm that you can see MKE containers:
docker ps -af state=running

On Windows Server 2016, open an elevated PowerShell prompt and run:

$AUTHTOKEN=((Invoke-WebRequest -Body '{"username":"<username>", "password":"<password>"}' -Uri https://`<mke-ip`>/auth/login -Method POST).Content)|ConvertFrom-Json|select auth_token -ExpandProperty auth_token

[io.file]::WriteAllBytes("ucp-bundle.zip", ((Invoke-WebRequest -Uri https://`<mke-ip`>/api/clientbundle -Headers @{"Authorization"="Bearer $AUTHTOKEN"}).Content))

Docker Build and MKE¶

When using a MKE client bundle and buildkit, follow the instructions provided in Restrict services to worker nodes to make sure that builds are not accidentally scheduled on manager nodes.

Install the kubectl binary¶

To use kubectl, install the binary on a workstation which has access to your MKE endpoint.

First, find which version of Kubernetes is running in your cluster. This can be found within the Mirantis Kubernetes Engine dashboard or at the MKE API endpoint version. You can also find the Kubernetes version using the Docker CLI. You need to source a client bundle and type the docker version command.

From the MKE dashboard, click About within the Admin menu in the top left corner of the dashboard. Then navigate to Kubernetes.

Once you have the Kubernetes version, install the kubectl client for the relevant operating system.

You can download the binary from <https://storage.googleapis.com/kubernetes-release/release/v.1.8.11/bin/windows/amd64/kubectl.exe>.

If you have curl installed on your system, you use these commands in Powershell.

Using kubectl with an MKE cluster¶

MKE provides users unique certificates and keys to authenticate against the Docker and Kubernetes APIs. Instructions on how to download these certificates and how to configure kubectl to use them can be found in CLI-based access.

Install Helm on MKE¶

Helm is the package manager for Kubernetes. Tiller is the Helm server. Before installing Helm on MKE, you must meet the following requirements:

• You must be running an MKE 3.1 or higher cluster.

• You must have kubectl configured to communicate with the cluster (usually this is done via a client bundle).

To use Helm and Tiller with MKE, you must grant the default service account within the kube-system namespace the necessary roles. Enter the following kubectl commands in this order:

kubectl create rolebinding default-view --clusterrole=view --serviceaccount=kube-system:default --namespace=kube-system

kubectl create clusterrolebinding add-on-cluster-admin --clusterrole=cluster-admin --serviceaccount=kube-system:default

It is recommended that you specify a Role and RoleBinding to limit Tiller’s scope to a particular namespace, as described in the Helm documentation.