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How to set up an external container registry

You can use an external registry for Epinio to store application images. You can do this by setting the following variables during the helm install:

helm install \
--set containerregistry.enabled=false \
--set global.registryURL=$REGISTRY_URL \
--set global.registryNamespace=$REGISTRY_NAMESPACE \
--set global.registryUsername=$REGISTRY_USER \
--set global.registryPassword=$REGISTRY_PASSWORD \
... (other options here) \
epinio epinio/epinio

Using Docker Hub as an example, you would have to set the value of $REGISTRY_URL to registry.hub.docker.com, $REGISTRY_USER and $REGISTRY_PASSWORD are set to the Docker Hub credentials. Lastly, $REGISTRY_NAMESPACE would be either an organization or username.

With these arguments set, Epinio doesn't deploy a registry on the cluster.

Advanced setup for a secure external registry

When access to the external registry is secured via TLS it's necessary to make the correct certificate known to both Epinio and the cluster (that is, the kubelets).

Assuming that epinio-external-registry-tls is the name of the Kubernetes secret used to store the certificate then adding to the helm install command:

    --set containerregistry.certificateSecret=epinio-external-registry-tls

is enough to make the certificate known to Epinio.

note

The secret needs to be in the epinio namespace. The certificate needs to be under the key tls.crt of that secret and needs to be in PEM format.

Making the same information known to the cluster itself, that is, the kubelets, differs between distributions of Kubernetes.

Assuming a k3s cluster running on an openSUSE or SLE-based host, and the certificate is in a file named CA.pem, in the current working directory the commands would be:

sudo cp CA.pem /etc/pki/trust/anchors/
sudo update-ca-certificates
sudo systemctl restart k3s[-agent].service