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Do not install Helm, use it within a Docker container

This page is part of the Deploying Drupal to Kubernetes series.

I am not a fan of installing software for the following reasons:

For these reasons, I prefer using the Docker approach and running everything I need within a Docker container. Let’s run Helm without installing it:

docker run -e KUBECONFIG="$KUBECONFIGONDOCKER" -ti --rm -v $(pwd):/apps -v ~/.kube:/root/.kube -v ~/.helm:/root/.helm -v ~/.config/helm:/root/.config/helm -v ~/.cache/helm:/root/.cache/helm alpine/helm

Remember, earlier, when we set the KUBECONFIGONDOCKER environment variable in our .bash_profile file? Now we can see it in use: because we’re sharing ~/.kube on our local machine with /root/.kube on our helm container, KUBECONFIG would not work on the container. Hence, KUBECONFIGONDOCKER.

You should see some output from the Helm tool, as if you had installed helm locally and typed helm.

(In this case we are running helm within a local Docker container based on its community-supported image. We are sharing our required local directories with the container, and making sure the container has access to the same KUBECONFIG environment variable as we have locally.)

To avoid typing this in every time we need helm, we can add the following alias to ~/.bash_profile:

alias helm='docker run -e KUBECONFIG="$KUBECONFIGONDOCKER" -ti --rm -v $(pwd):/apps -v ~/.kube:/root/.kube -v ~/.config/helm:/root/.config/helm -v ~/.cache/helm:/root/.cache/helm -v ~/.helm:/root/.helm alpine/helm'
source ~/.bash_profile
helm version
# version.BuildInfo{Version:"v3.1.1", GitCommit:"afe70585407b420d0097d07b21c47dc511525ac8", GitTreeState:"clean", GoVersion:"go1.13.8"}

We can also run this script:

./scripts/helm.sh version
version.BuildInfo{Version:"v3.1.2", GitCommit:"d878d4d45863e42fd5cff6743294a11d28a9abce", GitTreeState:"clean", GoVersion:"go1.13.8"}

Your version may differ, but make sure it’s 3 or above.

This page is part of the Deploying Drupal to Kubernetes series.