lagom-java-chirper-example

Overview

A Lagom Java example showcasing a Twitter-like application

Local JVM

Start all services using mvn lagom:runAll or sbt runAll.

Minikube

Prerequisites

A note on project setup

To enable the tooling for this project, the following steps were performed:

Add to plugins.sbt:

addSbtPlugin("com.lightbend.rp" % "sbt-reactive-app" % "0.3.1")

For each impl project, do the following in build.sbt:

project("my-service-impl").enablePlugins(SbtReactiveAppPlugin)

Build & Deploy

Install reactive-cli

See Tooling Documentation

Note: The current release has a bug on macOS. Run the following command as a work-around:

export DYLD_LIBRARY_PATH="/usr/local/opt/reactive-cli/lib:$DYLD_LIBRARY_PATH"

Start minikube

minikube start --memory 8192 --cpus 3

Setup Docker engine context to point to Minikube

eval $(minikube docker-env)

Enable Ingress Controller

minikube addons enable ingress

Install Helm in the Minikube

helm init

helm repo add incubator https://kubernetes-charts-incubator.storage.googleapis.com/

Install Cassandra

You will have to wait a minute for helm to initialize. This command should suceed after a minute or so.

helm install --namespace cassandra -n cassandra --set config.cluster_size=1 incubator/cassandra

Build Project

sbt clean docker:publishLocal

View Images

docker images

Deploy chirp-impl

rp generate-kubernetes-deployment "lagom-java-chirper-tooling-example/chirp-impl:1.0.0-SNAPSHOT" \
  --env JAVA_OPTS="-Dplay.crypto.secret=youmustchangeme1" \
  --external-service cas_native=_cql._tcp.cassandra-cassandra.cassandra.svc.cluster.local \
  --pod-controller-replicas 3 | kubectl apply -f -

Deploy friend-impl

rp generate-kubernetes-deployment "lagom-java-chirper-tooling-example/friend-impl:1.0.0-SNAPSHOT" \
  --env JAVA_OPTS="-Dplay.crypto.secret=youmustchangeme2" \
  --external-service cas_native=_cql._tcp.cassandra-cassandra.cassandra.svc.cluster.local \
  --pod-controller-replicas 3 | kubectl apply -f -

Deploy activity-stream-impl

rp generate-kubernetes-deployment "lagom-java-chirper-tooling-example/activity-stream-impl:1.0.0-SNAPSHOT" \
  --env JAVA_OPTS="-Dplay.crypto.secret=youmustchangeme3" | kubectl apply -f -

Deploy front-end

rp generate-kubernetes-deployment "lagom-java-chirper-tooling-example/front-end:1.0.0-SNAPSHOT" \
  --env JAVA_OPTS="-Dplay.crypto.secret=youmustchangeme4" | kubectl apply -f -

View Results

See the resources created for you

kubectl --namespace lagom-java-chirper-tooling-example get all

NAME                            DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
deploy/activityservice-v1-5-0   1         1         1            1           2h
deploy/chirpservice-v1-5-0      3         3         3            3           2h
deploy/friendservice-v1-5-0     3         3         3            3           2h
deploy/front-end-v1-5-0         1         1         1            1           2h

NAME                                   DESIRED   CURRENT   READY     AGE
rs/activityservice-v1-5-0-659877cd49   1         1         1         2h
rs/chirpservice-v1-5-0-6548865dc5      3         3         3         2h
rs/friendservice-v1-5-0-66f688897b     3         3         3         2h
rs/front-end-v1-5-0-87c5b6b79          1         1         1         2h

NAME                            DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
deploy/activityservice-v1-5-0   1         1         1            1           2h
deploy/chirpservice-v1-5-0      3         3         3            3           2h
deploy/friendservice-v1-5-0     3         3         3            3           2h
deploy/front-end-v1-5-0         1         1         1            1           2h

NAME                                   DESIRED   CURRENT   READY     AGE
rs/activityservice-v1-5-0-659877cd49   1         1         1         2h
rs/chirpservice-v1-5-0-6548865dc5      3         3         3         2h
rs/friendservice-v1-5-0-66f688897b     3         3         3         2h
rs/front-end-v1-5-0-87c5b6b79          1         1         1         2h

NAME                                         READY     STATUS    RESTARTS   AGE
po/activityservice-v1-5-0-659877cd49-59z4z   1/1       Running   0          2h
po/chirpservice-v1-5-0-6548865dc5-2fjn6      1/1       Running   0          2h
po/chirpservice-v1-5-0-6548865dc5-kgbbb      1/1       Running   0          2h
po/chirpservice-v1-5-0-6548865dc5-zcc6l      1/1       Running   0          2h
po/friendservice-v1-5-0-66f688897b-d22ph     1/1       Running   0          2h
po/friendservice-v1-5-0-66f688897b-fvndd     1/1       Running   0          2h
po/friendservice-v1-5-0-66f688897b-j9tzj     1/1       Running   0          2h
po/front-end-v1-5-0-87c5b6b79-mvnh8          1/1       Running   0          2h

NAME                  TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)                         AGE
svc/activityservice   ClusterIP   None         <none>        10000/TCP,10001/TCP,10002/TCP   2h
svc/chirpservice      ClusterIP   None         <none>        10000/TCP,10001/TCP,10002/TCP   2h
svc/friendservice     ClusterIP   None         <none>        10000/TCP,10001/TCP,10002/TCP   2h
svc/front-end         ClusterIP   None         <none>        10000/TCP                       2h

Open the URL this command prints in the browser

echo "http://$(minikube ip)"

fsat / lagom-java-chirper-tooling-example