Deploy EMQX Cluster in k8s with restricted access

Here we are assuming k8s cluster does not have access to the internet, and the user does not have permissions to create and/or use ClusterRole. Both emqx-operator and emqx are installed in the same namespace. Cert manager may be available cluster-wide or in the same namespace as emqx-operator. The emqx-operator is configured to use a private docker registry, and the emqx is configured to use a custom securityContext.

Task Target

• Push necessary images to a private docker registry
• Override default parameters of cert-manager to use private registry
• Manually install EMQX Operator CRDs
• Override default parameters of emqx-operator to use private registry, single namespace, custom securityContext, and disabled webhook
• Use custom securityContext for EMQX

Push cert-manager, emqx-operator and emqx-enterprise images to a private docker registry

export CERT_MANAGER_VERSION='v1.16.2'
export EMQX_OPERATOR_VERSION='2.2.26'
export EMQX_VERSION='5.8.4'
export REGISTRY='my.private.registry'

CERT_MANAGER_IMAGES=(
    "cert-manager-controller"
    "cert-manager-cainjector"
    "cert-manager-webhook"
    "cert-manager-acmesolver"
    "cert-manager-startupapicheck"
)

pull_retag_push() {
    local source=$1
    local target=$2
    docker pull "$source"
    docker tag "$source" "$target"
    docker push "$target"
}

for img in "${CERT_MANAGER_IMAGES[@]}"; do
    pull_retag_push "quay.io/jetstack/$img:$CERT_MANAGER_VERSION" "$REGISTRY/jetstack/$img:$CERT_MANAGER_VERSION"
done

pull_retag_push "emqx/emqx-enterprise:$EMQX_VERSION" "$REGISTRY/emqx/emqx-enterprise:$EMQX_VERSION"
pull_retag_push "emqx/emqx-operator-controller:$EMQX_OPERATOR_VERSION" "$REGISTRY/emqx/emqx-operator-controller:$EMQX_OPERATOR_VERSION"

Deploy cert-manager

Skip this step if cert-manager is installed in the cluster.

Update namespace name if required.

helm repo add jetstack https://charts.jetstack.io
helm repo update
helm upgrade --install cert-manager jetstack/cert-manager \
   --namespace emqx \
   --create-namespace \
   --set crds.enabled=true \
   --set image.repository=$REGISTRY/jetstack/cert-manager-controller \
   --set image.tag=$CERT_MANAGER_VERSION \
   --set webhook.image.repository=$REGISTRY/jetstack/cert-manager-webhook \
   --set webhook.image.tag=$CERT_MANAGER_VERSION \
   --set cainjector.image.repository=$REGISTRY/jetstack/cert-manager-cainjector \
   --set cainjector.image.tag=$CERT_MANAGER_VERSION \
   --set acmesolver.image.repository=$REGISTRY/jetstack/cert-manager-acmesolver \
   --set acmesolver.image.tag=$CERT_MANAGER_VERSION \
   --set startupapicheck.image.repository=$REGISTRY/jetstack/cert-manager-startupapicheck \
   --set startupapicheck.image.tag=$CERT_MANAGER_VERSION

Deploy EMQX Operator

Deploy CRDs manually from release assets

kubectl -n emqx apply -f https://github.com/emqx/emqx-operator/releases/download/$EMQX_OPERATOR_VERSION/crds.yaml

Deploy emqx-operator

If cert-manager is installed cluster-wide already, add --set cert-manager.enable=false.

In this example podSecurityContext and containerSecurityContext contain default values, override as necessary.

helm repo add emqx https://repos.emqx.io/charts
helm repo update
helm upgrade --install emqx-operator emqx/emqx-operator \
  --namespace emqx \
  --create-namespace \
  --set singleNamespace=true \
  --set webhook.enabled=false \
  --set crds.enabled=false \
  --set-json='podSecurityContext={"runAsNonRoot":true}' \
  --set-json='containerSecurityContext={"allowPrivilegeEscalation":false}' \
  --set image.repository=$REGISTRY/emqx/emqx-operator-controller \
  --set image.tag=$EMQX_OPERATOR_VERSION

Ensure emqx-operator is up and running

kubectl -n emqx wait --for=condition=Ready pods -l "control-plane=controller-manager"

Configure EMQX Cluster

apps.emqx.io/v2beta1 EMQX supports configuring the Core node of the EMQX cluster through the .spec.coreTemplate field, and configuring the Replicant node of the EMQX cluster using the .spec.replicantTemplate field. For more information, please refer to: API Reference.

• Save the following content as a YAML file and deploy it with the kubectl apply command

  apiVersion: apps.emqx.io/v2beta1
  kind: EMQX
  metadata:
    name: emqx
    namespace: emqx
  spec:
    image: emqx/emqx-enterprise:5.8

• Wait for the EMQX cluster to be ready, you can check the status of EMQX cluster through kubectl get command, please make sure STATUS is Running, this may take some time

  $ kubectl get emqx emqx
  NAME   IMAGE                      STATUS    AGE
  emqx   emqx/emqx-enterprise:5.8   Running   10m