antonmi / cluster

experimenting with beam cluster setup

Cluster

Experiment with clustering. Check the Medium article

Run locally:

START_SERVER=true iex --name app_a@127.0.0.1 --cookie secret -S mix

START_SERVER=true iex --name app_b@127.0.0.1 --cookie secret -S mix

Node.connect(:"app_b@127.0.0.1")

With Cluster.Strategy.LocalEpmd

LIBCLUSTER_STRATEGY=local_epmd iex --name app_a@127.0.0.1 --cookie secret -S mix

LIBCLUSTER_STRATEGY=local_epmd iex --name app_b@127.0.0.1 --cookie secret -S mix

docker-compose:

From local

Modify /etc/hosts

127.0.0.1 app-a1.docker

127.0.0.1 app-b1.docker

iex --name [e-mail] --cookie secret --erl '-dist_listen false -erl_epmd_port 9000' --remsh [e-mail]

iex --name [e-mail] --cookie secret --erl '-dist_listen false -erl_epmd_port 10000' --remsh [e-mail]

Kubernetes:

check:

kubectl get service

minikube service app-a

restart:

kubectl get deployment

kubectl delete deployment app-a-deployment

kubectl delete deployment app-b-deployment

kubectl apply -f k8s

rebuild containers:

eval $(minikube -p minikube docker-env)

docker build -t app-a .

docker build -t app-b .

Connect to cluster:

Modify /etc/hosts

127.0.0.1 app-a-0.beam-headless.default.svc.cluster.local

iex --cookie secret --name [e-mail] --erl '-dist_listen false -erl_epmd_port 9000' --remsh [e-mail]