start_etcd_cluster.sh

#!/usr/bin/env bash
set -e

instances=$(echo {0..2})
public_ip=$(hostname -I | cut -d' ' -f1)
peers=$(for i in $instances; do echo "etcd.$i=http://${public_ip}:$((2380+$i*100))"; done | tr '\n' ',')


for i in $instances
do
    docker stop etcd.$i > /dev/null 2>&1 || /bin/true
    docker rm -f etcd.$i > /dev/null 2>&1 || /bin/true
done

for i in $instances
do
    offset=$(($i*100))
    client_port=$((2379+$offset))
    peer_port=$((2380+$offset))

    docker run -d \
     -p $client_port:$client_port \
     -p $peer_port:$peer_port \
     --name etcd.$i \
     quay.io/coreos/etcd:v2.2.0 \
     -name etcd.$i \
     -advertise-client-urls http://$public_ip:$client_port \
     -listen-client-urls http://0.0.0.0:$client_port \
     -initial-advertise-peer-urls http://$public_ip:$peer_port \
     -listen-peer-urls http://0.0.0.0:$peer_port \
     -initial-cluster-token etcd-cluster-1 \
     -initial-cluster $peers \
     -initial-cluster-state new
done

client_peers=$(for i in $instances; do echo "http://${public_ip}:$((2379+$i*100))"; done | tr '\n' ',')
echo "Cluster started, peers: $client_peers"