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installing-memphis-with-an-external-metadata-database.md

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description
Memphis is a real-time data processing platform that can be configured to use an external metadata database for enhanced scalability and flexibility.

Installing Memphis with an External Metadata Database

Prerequisites

  • Kubernetes client (kubectl command) to interact with Kubernetes.
  • Helm (helm command) to install Kubernetes packages.
  • An external metadata database ( PostgreSQL) set up and accessible.

Deployment Steps - Production Environment:

Step 1: Create a Namespace for Memphis deployment

A Kubernetes namespace provides a mechanism to partition cluster resources between multiple users.

kubectl create namespace memphis

Step 2: Create a Secret for the Database Password

When creating a secret for your database password, you must replace CHANGEIT with the actual password you use to access your database. This should be done securely to prevent exposing the password:

kubectl create secret generic metadata-secret --from-literal=dbPass=CHANGEIT --namespace memphis

Verifying Creation

After creating the namespace and the secret, you can verify their existence with the following kubectl commands:

  • To get memphis namespace:

    kubectl get namespaces memphis

  • To view the created secret in memphis:

    kubectl get secret metadata-secret --namespace memphis

Step 3: Install Memphis Using Helm

Now, you're ready to install Memphis into your Kubernetes cluster, specifically into the memphis namespace. Use the helm install command:

helm repo add memphis https://k8s.memphis.dev/charts/ --force-update && helm install memphis memphis/memphis --set \
global.cluster.enabled="true",\
metadata.enabled="false",\
metadata.external.enabled="true",\
metadata.external.dbName=<database_name>,\
metadata.external.dbHost=<database_host>,\
metadata.external.dbPort=<database_port>,\
metadata.external.dbUser=<database_user>,\
metadata.external.secret.enabled="true" \
--create-namespace --namespace memphis --wait

Deployment Steps - Development Environment:

Step 1: Customize Configuration Values

Before running the Helm install command, identify all the CHANGEIT placeholder values in your configuration or command instructions.

Step 2: Install Memphis Using Helm:

helm repo add memphis https://k8s.memphis.dev/charts/ --force-update && helm install memphis memphis/memphis --set \
metadata.enabled="false",\
metadata.external.enabled="true",\
metadata.external.dbName=<database_name>,\
metadata.external.dbHost=<database_host>,\
metadata.external.dbPort=<database_port>,\
metadata.external.dbUser=<database_user>,\
metadata.external.dbPass=<database_pass> \
--create-namespace --namespace memphis

After completing the installation of Memphis (or any application) in both production and development environments using Helm, you should verify the installation to ensure that the application's pods are running as expected. The kubectl get pods --namepsace memphis command is a straightforward way to check the status of your pods within the memphis namespace.