weave_startup.sh

#!/bin/bash
#
# Waits for all machines to have joined cluster
# then starts Weave router on leader, and passes leader
# ip address to all other Weave launches.
#
# Usage: ./weave_startup.sh [clusterSize]
#
clusterSize=$1

while true; do 
  numInCluster=$(fleetctl list-machines --no-legend | wc -l | tr -d '[[:space:]]')
  if [ $numInCluster = $clusterSize ]; then
    leaderId=$(etcdctl get /_coreos.com/fleet/lease/engine-leader | pcregrep -o1 '\"MachineID\":\"(.*)\",')
    leaderIp=$(fleetctl list-machines --full | grep "$leaderId" | cut -f 2)
    selfId=$(curl -Ls http://127.0.0.1:4001/v2/stats/self | pcregrep -o1 '\"name\":\"([^\"]*)\",')
    echo "Leader: $leaderId, Self: $selfId"
    if [ "$selfId" = "$leaderId" ]; then
      echo "Starting weave router"
      /opt/bin/weave launch
    else
      echo "Connecting to weave peer $leaderIp"
      /opt/bin/weave launch $leaderIp
    fi
    break
  else
    echo "$numInCluster of $clusterSize machines connected. Waiting..."
  fi;
  sleep 5;
done