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
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