Deploy Guest Book App on Kubernetes Kodekloud

 

Question:  The Nautilus Application development team has finished development of one of the applications and it is ready for deployment. It is a guestbook application that will be used to manage entries for guests/visitors. As per discussion with the DevOps team, they have finalized the infrastructure that will be deployed on Kubernetes cluster. Below you can find more details about it.

BACK-END TIER

    Create a deployment named redis-master for Redis master.

    a.) Replicas count should be 1.

    b.) Container name should be master-redis-datacenter and it should use image redis.

    c.) Request resources as CPU should be 100m and Memory should be 100Mi.

    d.) Container port should be redis default port i.e 6379.

    Create a service named redis-master for Redis master. Port and targetPort should be Redis default port i.e 6379.

    Create another deployment named redis-slave for Redis slave.

    a.) Replicas count should be 2.

    b.) Container name should be slave-redis-datacenter and it should use gcr.io/google_samples/gb-redisslave:v3 image.

    c.) Requests resources as CPU should be 100m and Memory should be 100Mi.

    d.) Define an environment variable named GET_HOSTS_FROM and its value should be dns.

    e.) Container port should be Redis default port i.e 6379.

    Create another service named redis-slave. It should use Redis default port i.e 6379.

FRONT END TIER

    Create a deployment named frontend.

    a.) Replicas count should be 3.

    b.) Container name should be php-redis-datacenter and it should use gcr.io/google-samples/gb-frontend:v4 image.

    c.) Request resources as CPU should be 100m and Memory should be 100Mi.

    d.) Define an environment variable named as GET_HOSTS_FROM and its value should be dns.

    e.) Container port should be 80.

    Create a service named frontend. Its type should be NodePort, port should be 80 and its nodePort should be 30009.

Finally, you can check the guestbook app by clicking on + button in the top left corner and Select port to view on Host 1 then enter your nodePort.

You can use any labels as per your choice.

Note: The kubectl utility on jump_host has been configured to work with the kubernetes cluster.

Solution :

Create redis-master.yml. Update configuration according to question.

apiVersion: apps/v1

kind: Deployment

metadata:

name: redis-master

spec:

replicas: 1

selector:

matchLabels:

app: redis-master

tier: back-end

template:

metadata:

labels:

app: redis-master

tier: back-end

spec:

containers:

- name: master-redis-datacenter

image: redis

resources:

requests:

memory: "100Mi"

cpu: "100m"

ports:

- containerPort: 6379

Create redis-master-service.yml

apiVersion: v1

kind: Service

metadata:

name: redis-master

spec:

type: ClusterIP

selector:

app: redis-master

tier: back-end

ports:

- port: 6379

targetPort: 6379

Create redis-slave.yml

apiVersion: apps/v1

kind: Deployment

metadata:

name: redis-slave

spec:

replicas: 2

selector:

matchLabels:

app: redis-slave

tier: back-end

template:

metadata:

labels:

app: redis-slave

tier: back-end

spec:

containers:

- name: slave-redis-datacenter

image: gcr.io/google_samples/gb-redisslave:v3

resources:

requests:

memory: "100Mi"

cpu: "100m"

env:

- name: GET_HOSTS_FROM

value: dns

ports:

- containerPort: 6379

Create redis-slave-service.yml

apiVersion: v1

kind: Service

metadata:

name: redis-slave

spec:

type: ClusterIP

selector:

app: redis-slave

tier: back-end

ports:

- port: 6379

targetPort: 6379

Create frontend.yml

apiVersion: apps/v1

kind: Deployment

metadata:

name: frontend

spec:

replicas: 3

selector:

matchLabels:

app: guestbook

tier: front-end

template:

metadata:

labels:

app: guestbook

tier: front-end

spec:

containers:

- name: php-redis-datacenter

image: gcr.io/google-samples/gb-frontend:v4

resources:

requests:

memory: "100Mi"

cpu: "100m"

env:

- name: GET_HOSTS_FROM

value: dns

ports:

- containerPort: 80

Finally create frontend-service.yml

apiVersion: v1

kind: Service

metadata:

name: frontend

spec:

type: NodePort

selector:

app: guestbook

tier: front-end

ports:

- port: 80

targetPort: 80

nodePort: 30009

Then apply all using

kubectl apply -f .

Check the pods

kubectl get po

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About Ashadullah Shawon

I am Ashadullah Shawon. I am a Software Engineer. I studied Computer Science and Engineering (CSE) at RUET. I Like To Share Knowledge. Learn More: Click Here