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2023-06-08

Eliatra Suite on K8s: Manage SSL Certificates, Upgrades and Scale Out

This article describes installing an Eliatra Suite-protected OpenSearch cluster on Kubernetes with Helm using a dedicated PKI. We will also discuss how to scale out and upgrade the cluster.

Reading time: 3 minutes

By Eliatra

For a general quick start, please refer to Part 1 – Getting Started with Helm Charts.

Prerequisites

You must have Docker and a Kubernetes cluster installed on your local machine. In the scope of this blog post, we will install Kubernetes locally with minikube, but in the following parts of this blog post series, we will leverage AWS EKS for a production-grade setup.

The local minikube Kubernetes cluster will need 16 GB of memory and 4 CPUs. If you do not have such resources available on your local machine, we recommend trying this on an AWS m5.xlarge Ubuntu EC2 instance.

Install Helm if not already installed.

Install Docker on your local machine if not already installed. Ensure the Docker engine has the necessary resources assigned.

Install minikube if not already installed.

Download Eliatra Suite TLS Tool

Start Docker and check that it is running by executing docker run hello-world

Start minkube:

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minikube delete -p eliatra-suite
minikube start --driver docker --memory 16384 --cpus 4 --kubernetes-version "v1.23.3" --nodes 1 -p "eliatra-suite" --wait=true
minikube -p eliatra-suite  kubectl -- apply -f https://raw.githubusercontent.com/rancher/local-path-provisioner/v0.0.24/deploy/local-path-storage.yaml
minikube -p eliatra-suite  kubectl -- patch storageclass local-path -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'
minikube -p eliatra-suite  kubectl -- delete storageclass standard

This will start minikube with 16 GB of memory, 4 CPUs, and one node, and installs the rancher local-path-provisioner because minikubes own local-path storage class is not working well.

Get Eliatra Suite Helm Charts

We provide free and Open Source licensed Helm charts to install Eliatra Suite.

Get the Eliatra Suite Helm charts:

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git clone https://git.eliatra.com/eliatra-suite/eliatra-suite-helm.git

In contrast to the last article, we deploy the charts from a checkout instead of using a repository. The reason is that we need to copy the root CA files into the charts.

Create a Certificate Authority (CA)

In a production-grade setup, you probably want to use your own PKI to generate TLS certificates. To do so, you need your root CA certificate and the key. It’s also possible to create your own root CA if you do not already have one by using the Eliatra Suite TLS Tool. We already downloaded the TLS Tool in the prerequisites, so let’s generate a Root CA by creating a config.yml file for the TLS Tool:

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---
ca:
  root:
    dn: CN=root.ca.example.com,OU=CA,O=Example Com\, Inc.,DC=example,DC=com
    keysize: 2048
    validityDays: 365
    pkPassword: myrootcapassword
    file: root-ca.pem

Then, use the Eliatra Suite TLS Tool to create the root CA

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chmod +x eliatra-suite-tlstool-1.0.0.sh
./eliatra-suite-tlstool-1.0.0.sh --create-ca -c config.yml -t .

This will create two files, root-ca.key and root-ca.pem in your current working directory. Rename the files to crt.pem and key.pem.

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mkdir -p eliatra-suite-helm/secrets/ca
mv root-ca.key eliatra-suite-helm/secrets/ca/key.pem
mv root-ca.pem eliatra-suite-helm/secrets/ca/crt.pem

Install Eliatra Suite

We will now deploy an Eliatra Suite-secured OpenSearch cluster with the following configuration:

OpenSearch version 2.5.0

One master node, one data node, and one client node

Our own root CA

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helm install --set master.replicas=1 \
  --set master.replicas=1 \
  --set data.replicas=1 \
  --set client.replicas=1 \
  --set common.osversion=2.5.0 \
  --set common.ca_certificates_enabled=true \
  --set common.spctl_certificates_enabled=false \
  --set common.ca_password=myrootcapassword \
  --timeout 30m \
    esuite eliatra-suite-helm/.

Then run minikube -p eliatra-suite kubectl -- get pods --watch to check if all OpenSearch nodes are up and running. This will take a few minutes, depending on your hardware.

The result of the above command should look similar to:

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NAME                                              READY   STATUS      RESTARTS   AGE
esuite-eliatra-suite-cleanup-job-28090890-xxx     0/1     Completed   0          5m23s
esuite-eliatra-suite-cleanup-job-28090895-xxx     1/1     Running     0          23s
esuite-eliatra-suite-client-0                     1/1     Running     0          7m5s
esuite-eliatra-suite-data-0                       1/1     Running     0          7m5s
esuite-eliatra-suite-master-0                     1/1     Running     0          7m5s
esuite-eliatra-suite-osd-0                        1/1     Running     0          7m5s
esuite-eliatra-suite-spctl-initialize-rx4bd       0/1     Completed   0          7m5s

The password for the admin OpenSearch Dashboards user is auto-generated. To get the password, execute the following:

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minikube -p eliatra-suite  kubectl -- get secrets esuite-eliatra-suite-passwd-secret -o jsonpath='{.data.ES_ADMIN_PWD}' | base64 --decode

As a next step, execute

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export POD_NAME=$(kubectl get pods --namespace default -l "component=esuite-eliatra-suite,role=osd" -o jsonpath="{.items[0].metadata.name}")
kubectl port-forward --namespace default $POD_NAME 5601:5601

Now point your browser to https://localhost:5601, accept the self-signed TLS certificate, and login with username admin and the password from above.

Congratulations. You are now running an Eliatra Suite-protected OpenSearch cluster.

Scale-out

With the following helm upgrade command, we scale the cluster to 2 client nodes, 2 data nodes, and 3 master nodes without any interruption:

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helm upgrade --reuse-values \
  --set client.replicas=2 \
  --set data.replicas=2 \
  --set master.replicas=3 \
  --timeout 30m \
    esuite eliatra-suite-helm/.

The --reuse-values option is critical because it preserves the previously user-defined configuration of the helm chart.

Upgrade

To upgrade OpenSearch to 2.6.0 issue the following command:

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helm upgrade --reuse-values \
  --set common.osversion=2.6.0 \
  --timeout 30m \
    esuite eliatra-suite-helm/.

This will upgrade the cluster node-by-node without any interruption following the rolling restart (or rolling upgrade) procedure.

Cleanup

Run `minikube delete -p “eliatra-suite” to tear down and clean up everything. This will delete the minikube nodes and all associated data.

Next Steps

In our next article, we will set up a production-ready Eliatra Suite protected OpenSearch cluster on Amazon EKS.

Eliatra Suite on K8s: Manage SSL Certificates, Upgrades and Scale Out

This article describes installing an Eliatra Suite-protected OpenSearch cluster on Kubernetes with Helm using a dedicated PKI. We will also discuss how to scale out and upgrade the cluster.

Prerequisites

Get Eliatra Suite Helm Charts

Create a Certificate Authority (CA)

Install Eliatra Suite

Login into OpenSearch Dashboards

Scale-out

Upgrade

Cleanup

Next Steps

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