MirrorService

Spring Framework based Service which is mirroring requests with the option to delay requests and alter http response codes

Dependencies

At least: Java 21 and Maven 3.5

Build Service Logging

mvn package -DskipTests=true

Run with devtools

mvn spring-boot:run

Run Service

Windows

java -jar target\mirrorservice-0.3.1-SNAPSHOT.jar

Linux (service enabled)

./target/mirrorservice-0.3.1-SNAPSHOT.jar start

Docker build

docker build -t mirrorservice:latest . 
docker build -f Dockerfile25Jlink -t mirrorservice:jlink .

docker images --format "table {{.Repository}}\t{{.Tag}}\t{{.Size}}" | grep "mirrorservice"
mirrorservice   jre       479MB
mirrorservice   jlink     236MB

Docker run

docker run --rm --name mirrorservice -m 256M -p 8003:8080 -v /tmp:/tmp mirrorservice:latest
Completed initialization in 2 ms
Started MirrorserviceApplication in 2.154 seconds (process running for 2.891)

docker run --rm --name mirrorservice -m 256M -p 8003:8080 -v /tmp:/tmp mirrorservice:jlink
Completed initialization in 1 ms
Started MirrorserviceApplication in 1.184 seconds (process running for 1.401)

Docker Hub

• https://hub.docker.com/r/wlanboy/mirrorservice

Docker Registry repro

• https://github.com/wlanboy/MirrorService/packages/278492

Native build

curl -s "https://get.sdkman.io" | bash
sdk install java 21.0.5-tem
sdk install java 21.0.2-graalce
export GRAALVM_HOME=~/.sdkman/candidates/java/21.0.2-graalce
sudo apt-get install build-essential zlib1g-dev
mvn -Pnative spring-boot:build-image
take a coffee && do a walk && docker rm mirrorservice
docker run --name mirrorservice -m 256M -d -p 8003:8003 -v /tmp:/tmp docker.io/library/mirrorservice:0.3.1-SNAPSHOT

Native publish

docker tag docker.io/library/mirrorservice:0.3.1-SNAPSHOT wlanboy/mirrorservice:nativelatest
docker push wlanboy/mirrorservice:nativelatest

Native executable

mvn -Pnative native:compile
./target/mirrorservice

Call microservice

• curl http://localhost:8003/actuator/health

Result

{"status":"UP","groups":["liveness","readiness"]}

Get your requests back with http status code 201 and a wait time of 1000 ms

• http://localhost:8003/mirror?statuscode=201&wait=1000 (1000ms)

returns http status code 201 and waits for 10 ms / mirrors body and headers

Call microservice for dns resolve

• curl http://localhost:8003/resolve/gmk.lan

Result

["192.168.100.101"]

Kubernets deployment

Prepare

cd ~
git clone https://github.com/wlanboy/MirrorService.git

check you local kubectl

kubectl cluster-info
kubectl get pods --all-namespaces

deploy service on new namespace

cd ~/MirrorService
kubectl create namespace mirror
kubectl apply -f mirrorservice-deployment.yaml
kubectl apply -f mirrorservice-service.yaml
kubectl get pods -n mirror -o wide

check deployment and service

kubectl describe deployments -n mirror mirrorservice 
kubectl describe services -n mirror mirrorservice-service

expose service and get node port

docker run --name mirrorservice -m 256M -d -p 8003:8003 -v /tmp:/tmp mirrorservice:latest
kubectl expose deployment -n mirror mirrorservice --type=NodePort --name=mirrorservice-serviceexternal --port 8003
kubectl describe services -n mirror mirrorservice-serviceexternal 

Result:

Name:                     mirrorservice-serviceexternal
Namespace:                mirror
Labels:                   app=mirrorservice
Annotations:              <none>
Selector:                 app=mirrorservice
Type:                     NodePort
IP Family Policy:         SingleStack
IP Families:              IPv4
IP:                       10.108.40.139
IPs:                      10.108.40.139
Port:                     <unset>  8003/TCP
TargetPort:               8002/TCP
NodePort:                 <unset>  30412/TCP  <--- THIS IS THE PORT WE NEED
Endpoints:                10.10.0.7:8003
Session Affinity:         None
External Traffic Policy:  Cluster
Events:                   <none>

sdk command

sdk install java 21.0.5-tem
sdk install maven 3.9.9