The Flask app is exposing the 2 end points
GET request http://localhost:5001/
GET request http://localhost:5001/api/fizzbuzz
POST request http://localhost:5001/api/fizzbuzz
body as "{"number": 100 }"
Please check the curl commands
curl http://localhost:5001/
curl -d '{"number":100}' -H "Content-Type: application/json" -X POST http://localhost:5001/api/fizzbuzz
curl -d '{"number":0}' -H "Content-Type: application/json" -X POST http://localhost:5001/api/fizzbuzzTo deploy the application to in k8s, we first need to containerize if it:
We create a Dockerfile manifest file with the project build and run configurations.cd PROJECT_DIR
docker login
docker build -t santoshr1016/fizzbuzz:v0.0.3 .
docker run --rm --name fizzbuzz -it -p 5001:8000 -d santoshr1016/fizzbuzz:v0.0.3
docker push santoshr1016/fizzbuzz:v0.0.3curl http://localhost:5001/
curl -d '{"number":100}' -H "Content-Type: application/json" -X POST http://localhost:5001/api/fizzbuzz
curl -d '{"number":0}' -H "Content-Type: application/json" -X POST http://localhost:5001/api/fizzbuzzFind the kube-deployment.yaml manifest filekubectl apply -f kube-deployment.yaml
kubectl get deploy
➜ simple_fizz_buzz k get deploy
NAME READY UP-TO-DATE AVAILABLE AGE
fizzbuzz 3/3 3 3 28m
kubectl get pods
➜ simple_fizz_buzz k get pods
NAME READY STATUS RESTARTS AGE
fizzbuzz-fdbf987b7-6xx2j 1/1 Running 0 29m
fizzbuzz-fdbf987b7-d75kv 1/1 Running 0 29m
fizzbuzz-fdbf987b7-zwrj6 1/1 Running 0 29m
kubectl port-forward fizzbuzz-fdbf987b7-6xx2j 8080:8000
➜ simple_fizz_buzz kubectl port-forward fizzbuzz-fdbf987b7-6xx2j 8080:8000
Forwarding from 127.0.0.1:8080 -> 8000
Forwarding from [::1]:8080 -> 8000
➜ ~ curl localhost:8080/
"<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n <meta charset=\"UTF-8\">\n <title>This is FizzBuzz microservice homepage</title>\n</head>\n<body>\n <h1> Just a test message </h1>\n <p> Fizzbuzz is fun </p>\n</body>\n</html>"
➜ ~ curl localhost:8080/api/fizzbuzz
{"message": "This is Fizz Buzz api"}
➜ ~ curl -d '{"number":100}' -H "Content-Type: application/json" -X POST http://localhost:8080/api/fizzbuzz
{"message": "Fizzbuzz computed", "result": "[1, 2, 'Fizz', 4, 'Buzz', 'Fizz', 7, 8, 'Fizz', 'Buzz', 11, 'Fizz', 13, 14, 'FizzBuzz', 16, 17, 'Fizz', 19, 'Buzz', 'Fizz', 22, 23, 'Fizz', 'Buzz', 26, 'Fizz', 28, 29, 'FizzBuzz', 31, 32, 'Fizz', 34, 'Buzz', 'Fizz', 37, 38, 'Fizz', 'Buzz', 41, 'Fizz', 43, 44, 'FizzBuzz', 46, 47, 'Fizz', 49, 'Buzz', 'Fizz', 52, 53, 'Fizz', 'Buzz', 56, 'Fizz', 58, 59, 'FizzBuzz', 61, 62, 'Fizz', 64, 'Buzz', 'Fizz', 67, 68, 'Fizz', 'Buzz', 71, 'Fizz', 73, 74, 'FizzBuzz', 76, 77, 'Fizz', 79, 'Buzz', 'Fizz', 82, 83, 'Fizz', 'Buzz', 86, 'Fizz', 88, 89, 'FizzBuzz', 91, 92, 'Fizz', 94, 'Buzz', 'Fizz', 97, 98, 'Fizz', 'Buzz']"}
The port-forward command is good for testing the pods directly. But in production, you would want to expose the pod using services. The level of access the service provides to the set of pods depends on the service type which can be:
ClusterIP: Internal only.
NodePort: Gives each node an external IP that’s accessible from outside the cluster and also opens a Port. A kube-proxy
component that runs on each node of the Kubernetes cluster listens for incoming traffic on the port and forwards
them to the selected pods in a round-robin fashion.
LoadBalancer: Adds a load balancer from the cloud provider which forwards traffic from the service to the nodes within it.
Find the kube-service-fizzbuzz.yaml manifest file
Run kubectl apply -f kube-service-fizzbuzz.yaml
➜ simple_fizz_buzz k get pods
NAME READY STATUS RESTARTS AGE
fizzbuzz-fdbf987b7-6xx2j 1/1 Running 0 40m
fizzbuzz-fdbf987b7-d75kv 1/1 Running 0 40m
fizzbuzz-fdbf987b7-zwrj6 1/1 Running 0 40m
➜ simple_fizz_buzz k apply -f kube-service-fizzbuzz.yaml
service/fizzbuzz-service created
➜ simple_fizz_buzz k get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
fizzbuzz-service NodePort 10.107.188.226 <none> 8001:30186/TCP 6s
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 67m
➜ simple_fizz_buzz curl 192.168.99.1:30186/
"<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n <meta charset=\"UTF-8\">\n <title>This is FizzBuzz microservice homepage</title>\n</head>\n<body>\n <h1> Just a test message </h1>\n <p> Fizzbuzz is fun </p>\n</body>\n</html>"
➜ simple_fizz_buzz curl 192.168.99.1:30186/api/fizzbuzz
{"message": "This is Fizz Buzz api"}
➜ simple_fizz_buzz curl -d '{"number":100}' -H "Content-Type: application/json" -X POST 192.168.99.1:30186/api/fizzbuzz
{"message": "Fizzbuzz computed", "result": "[1, 2, 'Fizz', 4, 'Buzz', 'Fizz', 7, 8, 'Fizz', 'Buzz', 11, 'Fizz', 13, 14, 'FizzBuzz', 16, 17, 'Fizz', 19, 'Buzz', 'Fizz', 22, 23, 'Fizz', 'Buzz', 26, 'Fizz', 28, 29, 'FizzBuzz', 31, 32, 'Fizz', 34, 'Buzz', 'Fizz', 37, 38, 'Fizz', 'Buzz', 41, 'Fizz', 43, 44, 'FizzBuzz', 46, 47, 'Fizz', 49, 'Buzz', 'Fizz', 52, 53, 'Fizz', 'Buzz', 56, 'Fizz', 58, 59, 'FizzBuzz', 61, 62, 'Fizz', 64, 'Buzz', 'Fizz', 67, 68, 'Fizz', 'Buzz', 71, 'Fizz', 73, 74, 'FizzBuzz', 76, 77, 'Fizz', 79, 'Buzz', 'Fizz', 82, 83, 'Fizz', 'Buzz', 86, 'Fizz', 88, 89, 'FizzBuzz', 91, 92, 'Fizz', 94, 'Buzz', 'Fizz', 97, 98, 'Fizz', 'Buzz']"}
➜ simple_fizz_buzz kubectl scale --replicas=4 deployment/fizzbuzz ➜ simple_fizz_buzz k delete deploy fizzbuzz
deployment.extensions "fizzbuzz" deleted
simple_fizz_buzz k get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
fizzbuzz-service NodePort 10.107.188.226 <none> 8001:30186/TCP 7m51s
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 75m
➜ simple_fizz_buzz k delete svc fizzbuzz-service
service "fizzbuzz-service" deleted
➜ simple_fizz_buzz
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