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java-kube-ee

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java-kube-ee

This repository contains simple JavaEE JAX-RS Wildfly Swarm Micro-profile example playground application

prepare kubernetes cluster, build docker image, push into local registry
minikube start --cpus=4 --memory=4096
eval (minikube docker-env)
docker run -d --rm --name registry -p 5000:5000 registry:2
docker build -t 127.0.0.1:5000/app -f ./docker/src/Dockerfile .
docker push 127.0.0.1:5000/app
create kubernete yaml file
vim ./docker/k8s/app.yml

kubectl apply -f ./docker/k8s/app.yml --validate=false

kubectl get svc -o wide                                               23:51:57
NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)          AGE       SELECTOR
app          NodePort    10.0.0.189   <none>        8080:32464/TCP   3m        app=app

curl 192.168.99.100:32464
# or
http (minikube service app --url)                                                                               22:21:09

[
    "one",
    "two",
    "three",
    "kubeee"
]

now update code and redeploy app

deploy app
bash gradlew clean build
docker build -t 127.0.0.1:5000/app:v2 -f ./docker/src/Dockerfile .
docker push 127.0.0.1:5000/app:v2
vim ./docker/k8s/app.yml # update image: 127.0.0.1:5000/app:v2
kubectl apply -f ./docker/k8s --validate=false
terminal 1
kubectl get pods -w                 23:59:35
NAME                   READY     STATUS    RESTARTS   AGE
app-1515935557-411m1   1/1       Running   0          10m
app-1515935557-4d3gf   1/1       Terminating   0         4m
app-1515935557-4d3gf   0/1       Terminating   0         4m
app-3366916455-bw6m9   0/1       Pending   0         0s
app-3366916455-bw6m9   0/1       ContainerCreating   0         0s
app-3366916455-bw6m9   1/1       Running   0         1s
terminal 2
while true; curl (minikube service app --url); echo""; sleep 1; end
["one","two","three","kubeee"]
["one","two","three","kubeee"]
Waiting, endpoint for service is not ready yet...
["one","two","three","kubeee","2017-10-02T21:12:34.095Z"]
["one","two","three","kubeee","2017-10-02T21:12:36.182Z"]

second test but using ip, not minikube service

redeploy app prev version
vim ./docker/k8s/app.yml # update image: 127.0.0.1:5000/app
kubectl apply -f ./docker/k8s --validate=false
terminal 1
kubectl get pods -w                 23:59:35
NAME                   READY     STATUS    RESTARTS   AGE
app-1515935557-411m1   1/1       Running   0          10m
...
app-1515935557-4d3gf   1/1       Terminating   0         4m
app-1515935557-4d3gf   0/1       Terminating   0         4m
...
app-3366916455-bw6m9   0/1       Pending   0         0s
app-3366916455-bw6m9   0/1       ContainerCreating   0         0s
app-3366916455-bw6m9   1/1       Running   0         1s
terminal 2
while true; curl 192.168.99.100:32161; echo""; sleep 1; end
["one","two","three","kubeee"]
["one","two","three","kubeee"]
Waiting, endpoint for service is not ready yet...
["one","two","three","kubeee","172.17.0.5"]
["one","two","three","kubeee","172.17.0.6"]
autoscale
kubectl autoscale deployment app --min=2 --max=3
scale down
kubectl scale deployment app --replicas=3
cleanup
kubectl delete all -l name=app
# or
kubectl delete service app; kubectl delete deployment app

minikube stop; minikube delete

old

using gradle / java microprofile
bash gradlew clean build
java -Djava.net.preferIPv4Stack=true -jar build/libs/java-kube-ee-swarm.jar
http :8080
e2e tests using bash scripts)
bash ./docker/bin/test-dockerfile.bash     # docker
bash ./docker/bin/test-docker-compose.bash # docker compose
bash ./docker/bin/test-stack-deploy.bash   # docker swarm cluster

links