HOWTO
- https://www.eclipse.org/community/eclipse_newsletter/2020/november/3.php
- https://operatorhub.io/operator/wildfly
- https://github.com/wildfly/wildfly-operator/blob/master/doc/user-guide.adoc
- https://kubernetes.io/
- https://kubernetes.io/blog/
- https://www.manning.com/books/kubernetes-in-action
- https://kubernetes.io/docs/tasks/run-application/run-stateless-application-deployment/
- Minikube tutorial https://kubernetes.io/docs/tutorials/hello-minikube/
GitHub repos
- https://github.com/wildfly/wildfly-operator
- Java EE 8 minimal application hhttps://github.com/dveselka/java-ee-8/tree/main/java-ee8-minimal
Build JBoss Wildfly Docker image GitHub repo https://github.com/dveselka/java-ee-8/tree/main/java-ee8-minimal Dockerfile
$ more Dockerfile
FROM jboss/wildfly
RUN /opt/jboss/wildfly/bin/add-user.sh admin Admin#123 --silent
COPY ./target/java-ee8-minimal.war /opt/jboss/wildfly/standalone/deployments/
CMD ["/opt/jboss/wildfly/bin/standalone.sh", "-b", "0.0.0.0", "-bmanagement", "0.0.0.0"]
mvn clean package && docker build -t dveselka/java-ee8-minimal .
....
Sending build context to Docker daemon 111.6kB
Step 1/4 : FROM jboss/wildfly
latest: Pulling from jboss/wildfly
75f829a71a1c: Pull complete
7b11f246b3d3: Pull complete
b765648c2a58: Pull complete
506aff4a9c5a: Pull complete
a7ae73eec52a: Pull complete
Digest: sha256:c0be1b7462a7ee9d07be5e319f7f2b10a93e5b43d51532ed012d2869e0224cf0
Status: Downloaded newer image for jboss/wildfly:latest
---> 13b4b5beba73
Step 2/4 : RUN /opt/jboss/wildfly/bin/add-user.sh admin Admin#123 --silent
---> Running in ecb1651c51fc
Removing intermediate container ecb1651c51fc
---> 74f6e50296e9
Step 3/4 : COPY ./target/java-ee8-minimal.war /opt/jboss/wildfly/standalone/deployments/
---> dd07d8a883fc
Step 4/4 : CMD ["/opt/jboss/wildfly/bin/standalone.sh", "-b", "0.0.0.0", "-bmanagement", "0.0.0.0"]
---> Running in d9575f15ea43
Removing intermediate container d9575f15ea43
---> 01e0043e9e6f
Successfully built 01e0043e9e6f
Successfully tagged dveselka/java-ee8-minimal:latest
[dave@dave java-ee8-minimal]$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
dveselka/java-ee8-minimal latest 01e0043e9e6f 3 minutes ago 714MB
$ docker push dveselka/java-ee8-minimal
The push refers to repository [docker.io/dveselka/java-ee8-minimal]
4a24521ab9d6: Pushed
348cd5508b6f: Pushed
9ef61a25476f: Mounted from jboss/wildfly
869989761eb2: Mounted from jboss/wildfly
3fbe1e874b0d: Mounted from jboss/wildfly
115463be137a: Mounted from jboss/wildfly
613be09ab3c0: Mounted from jboss/wildfly
latest: digest: sha256:d416275117d084e0cf557f6cf1ad82dc0aba7bf67921e4f19703e9a48701b2ec size: 1790
$ kubectl run java-ee8-minimal --image=dveselka/java-ee8-minimal
kubectl get pods
NAME READY STATUS RESTARTS AGE
java-ee8-minimal 0/1 ImagePullBackOff 0 12s
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
5f6397acb7e1 gcr.io/k8s-minikube/kicbase:v0.0.18 "/usr/local/bin/entr…" 21 hours ago Up 22 minutes 127.0.0.1:32772->22/tcp, 127.0.0.1:32771->2376/tcp, 127.0.0.1:32770->5000/tcp, 127.0.0.1:32769->8443/tcp, 127.0.0.1:32768->32443/tcp minikube
$ kubectl cluster-info
Kubernetes control plane is running at https://172.17.0.2:8443
KubeDNS is running at https://172.17.0.2:8443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
[dave@dave java-ee8-minimal]$ minikube dashboard
🔌 Enabling dashboard ...
▪ Using image kubernetesui/dashboard:v2.1.0
▪ Using image kubernetesui/metrics-scraper:v1.0.4
🤔 Verifying dashboard health ...
🚀 Launching proxy ...
🤔 Verifying proxy health ...
🎉 Opening http://127.0.0.1:43609/api/v1/namespaces/kubernetes-dashboard/services/http:kubernetes-dashboard:/proxy/ in your default browser...
$ kubectl port-forward java-ee8-minimal 9990:9990
Forwarding from 127.0.0.1:9990 -> 9990
Forwarding from [::1]:9990 -> 9990
Handling connection for 9990
$ wget http://localhost:8080/
--2021-03-14 17:28:48-- http://localhost:8080/
Resolving localhost (localhost)... ::1, 127.0.0.1
Connecting to localhost (localhost)|::1|:8080... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1504 (1.5K) [text/html]
Saving to: ‘index.html’
curl http://localhost:8080/java-ee8-minimal/resources/ping
Enjoy Jakarta EE with MicroProfile 2+
$ kubectl apply -f app.yml
deployment.apps/java-ee8-minimal created
[dave@dave java-ee8-minimal]$ kubectl get pods
NAME READY STATUS RESTARTS AGE
java-ee8-minimal-76cd57679d-l5smd 0/1 ContainerCreating 0 3s
java-ee8-minimal-76cd57679d-swvcd 0/1 ContainerCreating 0 3s
more app.yml
apiVersion: apps/v1
kind: Deployment
metadata:
name: java-ee8-minimal
spec:
selector:
matchLabels:
app: java-ee8
replicas: 2 # tells deployment to run 2 pods matching the template
template:
metadata:
labels:
app: java-ee8
spec:
containers:
- name: java-ee8-minimal
image: dveselka/java-ee8-minimal
ports:
- containerPort: 8080
[dave@dave java-ee8-minimal]$ kubectl get pods -l app=java-ee8 -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
java-ee8-minimal-76cd57679d-l5smd 1/1 Running 0 3m35s 172.18.0.5 minikube <none> <none>
java-ee8-minimal-76cd57679d-swvcd 1/1 Running 0 3m35s 172.18.0.6 minikube <none> <none>
dave@dave java-ee8-minimal]$ kubectl expose deployment/java-ee8-minimal
service/java-ee8-minimal exposed
[dave@dave java-ee8-minimal]$ curl 172.18.0.5:8080
curl: (7) Failed to connect to 172.18.0.5 port 8080: No route to host
[dave@dave java-ee8-minimal]$ kubectl get pods -l app=java-ee8 -o wide |grep podIP
[dave@dave java-ee8-minimal]$ kubectl get pods -l app=java-ee8 -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
java-ee8-minimal-76cd57679d-l5smd 1/1 Running 0 5m28s 172.18.0.5 minikube <none> <none>
java-ee8-minimal-76cd57679d-swvcd 1/1 Running 0 5m28s 172.18.0.6 minikube <none> <none>
[dave@dave java-ee8-minimal]$ kubectl get svc java-ee8-minimal
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
java-ee8-minimal ClusterIP 10.103.186.17 <none> 8080/TCP 35s
[dave@dave java-ee8-minimal]$ kubectl get svc java-ee8-minimal
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
java-ee8-minimal ClusterIP 10.103.186.17 <none> 8080/TCP 40s
[dave@dave java-ee8-minimal]$ kubectl get ep java-ee8-minimal
NAME ENDPOINTS AGE
java-ee8-minimal 172.18.0.5:8080,172.18.0.6:8080 61s
[dave@dave java-ee8-minimal]$ curl 172.18.0.5:8080/java-ee8-minimal/resources/ping
curl: (7) Failed to connect to 172.18.0.5 port 8080: No route to host
[dave@dave java-ee8-minimal]$ kubectl exec my-nginx-3800858182-jr4a2 -- printenv | grep SERVICE^C
[dave@dave java-ee8-minimal]$ kubectl get pods
NAME READY STATUS RESTARTS AGE
java-ee8-minimal-76cd57679d-l5smd 1/1 Running 0 7m18s
java-ee8-minimal-76cd57679d-swvcd 1/1 Running 0 7m18s
[dave@dave java-ee8-minimal]$ kubectl exec java-ee8-minimal-76cd57679d-l5smd -- printenv | grep SERVICE
KUBERNETES_SERVICE_PORT=443
KUBERNETES_SERVICE_PORT_HTTPS=443
KUBERNETES_SERVICE_HOST=10.96.0.1
[dave@dave java-ee8-minimal]$ kubectl get services kube-dns --namespace=kube-system
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kube-dns ClusterIP 10.96.0.10 <none> 53/UDP,53/TCP,9153/TCP 26h
[dave@dave java-ee8-minimal]$ kubectl run curl --image=radial/busyboxplus:curl -i --tty
If you don't see a command prompt, try pressing enter.
[ root@curl:/ ]$ nslookup java-ee8-minimal
Server: 10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local
nslookup: can't resolve 'java-ee8-minimal'
[ root@curl:/ ]$ curl 172.18.0.5:8080/java-ee8-minimal/resources/ping
$ kubectl apply -f ingress.yaml
ingress.networking.k8s.io/java-ee8-ingress configured
[dave@dave java-ee8-minimal]$ kubectl describe ingress java-ee8-ingress
Name: java-ee8-ingress
Namespace: default
Address:
Default backend: default-http-backend:80 (<error: endpoints "default-http-backend" not found>)
Rules:
Host Path Backends
---- ---- --------
*
/java-ee8-minimal java-ee8-minimal:8080 (172.18.0.5:8080,172.18.0.6:8080)
Annotations: nginx.ingress.kubernetes.io/rewrite-target: /
Events: <none>
[dave@dave java-ee8-minimal]$ kubectl get pods
NAME READY STATUS RESTARTS AGE
curl 1/1 Running 1 3h49m
java-ee8-minimal-76cd57679d-l5smd 1/1 Running 0 3h58m
java-ee8-minimal-76cd57679d-swvcd 1/1 Running 0 3h58m
[dave@dave java-ee8-minimal]$ kubectl exec --stdin --tty java-ee8-minimal-76cd57679d-l5smd -- /bin/bash
[jboss@java-ee8-minimal-76cd57679d-l5smd ~]$ curl localhost:8080/java-ee8-minimal/resources/ping
Enjoy Jakarta EE with MicroProfile 2+!
[jboss@java-ee8-minimal-76cd57679d-l5smd ~]$ cd wildfly/
[jboss@java-ee8-minimal-76cd57679d-l5smd wildfly]$ ls
LICENSE.txt README.txt appclient bin copyright.txt docs domain jboss-modules.jar modules standalone welcome-content
[jboss@java-ee8-minimal-76cd57679d-l5smd wildfly]$ cd bin
[jboss@java-ee8-minimal-76cd57679d-l5smd bin]$ ./add-user.sh
What type of user do you wish to add?
a) Management User (mgmt-users.properties)
b) Application User (application-users.properties)
(a):
$ kubectl port-forward java-ee8-minimal-76cd57679d-l5smd 9990:9990
Forwarding from 127.0.0.1:9990 -> 9990
Forwarding from [::1]:9990 -> 9990
Handling connection for 9990
http://localhost:9990/console
$ minikube service java-ee8-service
|-----------|------------------|-------------|-------------------------|
| NAMESPACE | NAME | TARGET PORT | URL |
|-----------|------------------|-------------|-------------------------|
| default | java-ee8-service | 8080 | http://172.17.0.2:30919 |
|-----------|------------------|-------------|-------------------------|
🎉 Opening service default/java-ee8-service in default browser...
$ wget -O - http://172.17.0.2:30919
--2021-03-20 09:33:06-- http://172.17.0.2:30919/
Connecting to 172.17.0.2:30919... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1504 (1.5K) [text/html]
Saving to: ‘STDOUT’
- 0%[ ] 0 --.-KB/s <!DOCTYPE html>
<html>
<head>
<!-- proper charset -->
<meta http-equiv="content-type" content="text/html;charset=utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE8" />
<title>Welcome to WildFly</title>
<link rel="shortcut icon" href="favicon.ico" type="image/x-icon">
<link rel="StyleSheet" href="wildfly.css" type="text/css">
</head>
<body>
<div class="wrapper">
<div class="content">
<div class="logo">
<img src="wildfly_logo.png" alt="WildFly" border="0" />
</div>
<h1>Welcome to WildFly</h1>
<h3>Your WildFly instance is running.</h3>
<p><a href="https://docs.wildfly.org">Documentation</a> | <a href="https://github.com/wildfly/quickstart">Quickstarts</a> | <a href="/console">Administration
Console</a> </p>
<p><a href="https://wildfly.org">WildFly Project</a> |
<a href="https://community.jboss.org/en/wildfly">User Forum</a> |
<a href="https://issues.jboss.org/browse/WFLY">Report an issue</a></p>
<p class="logos"><a href="https://www.jboss.org"><img src="jbosscommunity_logo_hori_white.png" alt="JBoss and JBoss Community" width=
"195" height="37" border="0"></a></p>
<p class="note">To replace this page simply deploy your own war with / as its context path.<br />
To disable it, remove the "welcome-content" handler for location / in the undertow subsystem.</p>
</div>
</div>
</body>
</html>
- 100%[===============================================================================>] 1.47K --.-KB/s in 0s
2021-03-20 09:33:06 (36.7 MB/s) - written to stdout [1504/1504]
