docker + libnetwork (overlay) quickstart

gistfile1.sh

# install the kernel from utopic (on both nodes)
apt-get install -y linux-image-generic-lts-utopic
reboot

# install experimental docker release (on both nodes)
wget -qO- https://experimental.docker.com/ | sh

# install consul (on both nodes)
curl -OL https://dl.bintray.com/mitchellh/consul/0.5.2_linux_amd64.zip
apt-get install -y unzip
unzip 0.5.2_linux_amd64.zip
rm 0.5.2_linux_amd64.zip
mv consul /usr/local/bin/

# start consul on node-1
consul agent -server -bootstrap -data-dir /tmp/consul -bind=$(ifconfig eth0 | awk '/inet addr/{print substr($2,6)}') > /var/log/consul.log 2>&1 &

# start consul on node-2
consul agent -data-dir /tmp/consul -bind=$(ifconfig eth0 | awk '/inet addr/{print substr($2,6)}') > /var/log/consul.log 2>&1 &

# join node-2 to node-1
consul join <ip address of node-1>

# configure docker daemon on node-1 with these additional options:
--kv-store=consul:localhost:8500 --label=com.docker.network.driver.overlay.bind_interface=eth0

# configure docker daemon on node-2
--kv-store=consul:localhost:8500 --label=com.docker.network.driver.overlay.bind_interface=eth0 --label=com.docker.network.driver.overlay.neighbor_ip=<host-1-ip-address>

### example 1 (ping)
# start container on node-1 attached to network
docker run -it --publish-service=svc1.dev.overlay debian:jessie

# start container on node-2 attached to network
docker run -it --publish-service=svc2.dev.overlay debian:jessie

# ping svc1 from svc2 from inside the container on node-2
ping svc1

### example 2 (multi-container app)
# start postgres on node-1 attached to network
docker run -it --rm -p 5432 --publish-service=postgres.dev.overlay -e POSTGRES_USER=demo -e POSTGRES_PASSWORD=demo postgres:latest

# start docker-demo app on node-2
docker run -it --rm -p 8080:8080 --publish-service=web.dev.overlay ehazlett/docker-demo-pg:latest -db-host="postgres" -db-name="demo" -db-pass="demo" -db-port=5432 -db-ssl="disable" -db-user="demo"