Learning Microservices wit Spring Boot & Spring Cloud and containerizing using Docker and orchestrating using Kubernetes
Extra learnings apart from Microservices-v1
- Docker
- Kubernetes
- Spring Boot 2.4.x+ & Spring Cloud 2020.x+
- Service Registry using Eureka Naming Server
- Load Balancing with Spring Cloud LoadBalancer (replacing Ribbon)
- API Gateway with Spring Cloud Gateway (instead of Zuul)
- Circuit Breaker with Resilience4j (instead of Hystrix)
- Distributed Tracing with Zipkin
- Asynchronous Communication using Rabbit MQ
Docker Commands
docker run -p 9411:9411 openzipkin/zipkin:2.23
docker push docker.io/syedaanif/ms-v2-currency-exchange-service:0.0.1-SNAPSHOT
docker-compose --version
docker-compose up
docker push syedaanif/ms-v2-naming-server:0.0.1-SNAPSHOT
docker push syedaanif/ms-v2-currency-conversion-service:0.0.1-SNAPSHOT
docker push syedaanif/ms-v2-api-gateway:0.0.1-SNAPSHOT
Docker Repository to download images from.
Kubernetes Commands
kubectl get events
kubectl get pods
kubectl get replicaset
kubectl get deployment
kubectl get service
kubectl explain pods
kubectl get pods -o wide
kubectl get events --sort.by=.metadata.creationTimestamp
kubectl get rs
kubectl get rs -o wide
docker login
docker push syedaanif/ms-v2-currency-exchange-service:0.0.1-SNAPSHOT
docker push syedaanif/ms-v2-currency-conversion-service:0.0.1-SNAPSHOT
kubectl create deployment currency-exchange --image=syedaanif/ms-v2-currency-exchange-service:0.0.1-SNAPSHOT
kubectl expose deployment currency-exchange --type=LoadBalancer --port=8000
kubectl create deployment currency-conversion --image=syedaanif/ms-v2-currency-conversion-service:0.0.11-SNAPSHOT
kubectl expose deployment currency-conversion --type=LoadBalancer --port=8100
kubectl get deployment currency-exchange -o yaml >> deployment.yaml
kubectl get service currency-exchange -o yaml >> service.yaml
kubectl diff -f deployment.yaml
kubectl apply -f deployment.yaml
kubectl delete all -l app=currency-exchange
kubectl delete all -l app=currency-conversion
kubectl rollout history deployment currency-conversion
kubectl rollout history deployment currency-exchange
kubectl rollout undo deployment currency-exchange --to-revision=1
kubectl logs currency-exchange-9fc6f979b-2gmn8
kubectl logs -f currency-exchange-9fc6f979b-2gmn8
kubectl autoscale deployment currency-exchange --min=1 --max=3 --cpu-percent=5
kubectl get hpa
kubectl top pod
kubectl top nodes
kubectl get hpa
kubectl delete hpa currency-exchange
kubectl create configmap currency-conversion --from-literal=CURRENCY_EXCHANGE_URI=http://currency-exchange
kubectl get configmap
kubectl get configmap currency-conversion -o yaml >> configmap.yaml
Ports
| Application | Port |
|---|---|
| Limits Service | 8080, 8081, ... |
| Spring Cloud Config Server | 8888 |
| Currency Exchange Service | 8000, 8001, 8002, .. |
| Currency Conversion Service | 8100, 8101, 8102, ... |
| Netflix Eureka Naming Server | 8761 |
| Netflix Zuul API Gateway Server | 8765 |
| Zipkin Distributed Tracing Server | 9411 |
Zipkin Installation Quick Start Page
https://zipkin.io/pages/quickstart
Downloading Zipkin Jar
https://search.maven.org/remote_content?g=io.zipkin.java&a=zipkin-server&v=LATEST&c=exec
Command to run
RABBIT_URI=amqp://localhost java -jar zipkin-server-2.12.9-exec.jar