Day 35: Mastering ConfigMaps and Secrets in Kubernetes🔒🔑🛡️

🔶 What are ConfigMaps and Secrets in K8s

In Kubernetes, ConfigMaps and Secrets are used to store configuration data and secrets, respectively. ConfigMaps store configuration data as key-value pairs, while Secrets store sensitive data in an encrypted form.

Example:- Imagine you're in charge of a big spaceship (Kubernetes cluster) with lots of different parts (containers) that need information to function properly. ConfigMaps are like a file cabinet where you store all the information each part needs in simple, labeled folders (key-value pairs). Secrets, on the other hand, are like a safe where you keep important, sensitive information that shouldn't be accessible to just anyone (encrypted data). So, using ConfigMaps and Secrets, you can ensure each part of your spaceship (Kubernetes cluster) has the information it needs to work properly and keep sensitive information secure!
Read more about ConfigMap & Secret.

Prerequisites Make instances of t2.medium.

      # First all update system and install Docker 
      sudo apt-get update
      sudo apt-get install docker.io -y
      sudo usermod -aG docker $USER && newgrp docker

      # To install Minikube & Kubectl
      curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64
      sudo install minikube-linux-amd64 /usr/local/bin/minikube 

      sudo snap install kubectl --classic
      minikube start --driver=docker

🔶 Task 1: Create a ConfigMap for your Deployment

Create a ConfigMap for your Deployment using a file or the command line

    apiVersion: v1
    kind: ConfigMap
    metadata:
      name: my-configmap
      labels:
        app: django-todo-app
      namespace: devops
    data:
      MYSQL_DB: "database_todo"

Update the deployment.yml file to include the ConfigMap.

Apply the updated deployment using the command: kubectl apply -f deployment.yml -n <namespace-name>

    apiVersion: apps/v1
     kind: Deployment
     metadata:
       name: mysql-configuration
       labels:
         app: mysql
       namespace: devops 
     spec:
       replicas: 3
       selector:
         matchLabels:
           app: mysql
       template:
         metadata:
           labels:
             app: mysql
         spec:
           containers:
           - name: mysql-container
             image: mysql:8
             ports:
             - containerPort: 3306
             env:
             - name: MYSQL_DATABASE
               valueFrom:
                 configMapKeyRef:
                   name: my-configmap
                   key: MYSQL_DB

Verify that the ConfigMap has been created by checking the status of the ConfigMaps in your Namespace.

🔶 Task 2: Create a Secret for your Deployment

First of we need to make a password

    echo -n 'cdac321' | base64
    #Y2RhYzMyMQ==
    echo -n 'Y2RhYzMyMQ==' | base64 --decode
    #cdac321

          apiVersion: v1
          kind: Secret
          metadata:   
            name: my-secret
            namespace: devops
          type: Opaque
          data:
            password: Y2RhYzMyMQ==

Create a Secret for your Deployment using a file or the command line

          kubectl apply -f secret.yml -n devops
          #secret/my-secret created
          kubectl get secrets -n devops

Update the deployment.yml file to include the Secret.

   apiVersion: apps/v1
   kind: Deployment
         metadata:
         name: mysql-configuration
         labels:
             app: mysql
             namespace: devops 
   spec:
           replicas: 3
           selector:
             matchLabels:
               app: mysql
           template:
             metadata:
               labels:
                 app: mysql
             spec:
               containers:
               - name: mysql-container
                 image: mysql:8
                 ports:
                 - containerPort: 3306
                 env:
                 - name: MYSQL_ROOT_PASSWORD
                   valueFrom:
                     secretKeyRef:
                       name: my-secret
                       key: password
                 - name: MYSQL_DATABASE
                   valueFrom:
                     configMapKeyRef:
                       name: my-configmap
                       key: MYSQL_DB

Apply the updated deployment using the command: kubectl apply -f deployment.yml -n <namespace-name>
Verify that the Secret has been created by checking the status of the Secrets in your Namespace.

Need help with ConfigMaps and Secrets? Check out this video for assistance.

Keep learning and expanding your knowledge of Kubernetes

Happy Learning :)

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Day 35: Mastering ConfigMaps and Secrets in Kubernetes🔒🔑🛡️

Table of contents

🔶 What are ConfigMaps and Secrets in K8s

🔶 Task 1: Create a ConfigMap for your Deployment

🔶 Task 2: Create a Secret for your Deployment