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Hello World CoreOS Application

Building

sbt clean compile test docker

Deploying Docker Containers

docker push carlpulley/helloworld:v0.1.0-SNAPSHOT

Running on a CoreOS Cluster

git clone https://github.com/carlpulley/coreos-vagrant.git
cd coreos-vagrant
INSTANCE=1,2 CLOUD_CONFIG=helloworld/akka METADATA="akka=true" vagrant up
INSTANCE=3 CLOUD_CONFIG=helloworld/akka METADATA="akka=true,load-balancer=true" vagrant up
INSTANCE=4 CLOUD_CONFIG=cassandra METADATA="cassandra=true" vagrant up
# You should now have a 4 machine cluster provisioned
ssh-add ~/.vagrant.d/insecure_private_key
vagrant ssh core-01 -- -A
fleetctl start app@{1..4} vulcand cassandra seed
# You should now have:
#   - a 'Hello World!' Akka cluster running with 4 members
#   - a Vulcan load balancer interfacing with the cluster
#   - events being persisted to a Cassandra journal/snapshot store!
# TERMINAL 1 - execute the following command:
fleetctl ssh app@1
docker logs -f app-1 | grep -v akka.cluster.ClusterHeartbeatSender
# TERMINAL 2 - execute the following shell commands:
for i in 1 2 3 4; do
  echo -n "GET /ping/$i -> "
  curl -H "Host: helloworld.cakesolutions.net" http://172.17.8.103:8888/ping/$i
  echo
done
# In viewing terminal 1, you should see evidence that:
#   - Vulcand has round-robin delivered a GET request to app-1
#   - cluster sharding is used to route messages to the correct 'Hello World' actor endpoint hosting app-1
#   - evidence of actor spin up and passivation
#   - each curl request should return the IP address of the 'Hello World' application that handled the request