bootstrap-consul

#!/bin/bash
hostname="consul-$(curl -s http://169.254.169.254/latest/meta-data/instance-id)"
CONF=/etc/consul/config/000-consul.json
TEMPLATE="/mnt/dashboard/consul-config/config.json"
x=0

rm -f $CONF
rm -f /tmp/instances $$ rm -f /tmp/*.json

restart consul

while [ -z "$(curl -s http://localhost:8500/v1/status/leader)" ] || [ "$(curl -s http://localhost:8500/v1/status/leader)" == \"\" ]; do
 echo "no cluster leader"
 while [ ! -s /tmp/instances ]; do
    aws ec2 describe-instances --region eu-west-1 --filters 'Name=tag:Name,Values=dashing-ecs-instance' 'Name=instance-state-name,Values=running' | jq '.Reservations[].Instances[].PrivateIpAddress' > /tmp/instances
    sleep 10
  done
 while [ "$x" -lt 30 ] && [ ! -e $TEMPLATE ]; do
   x=$((x+1))
   sleep 1
 done
 if [ ! -e $TEMPLATE ]
 then
  echo "$TEMPLATE not found in time limit" >> /var/log/consul.log
  exit 1
 fi
 internalIP=$(curl -s http://169.254.169.254/latest/meta-data/local-ipv4)
 cat /mnt/dashboard/consul-config/config.json | jq ".advertise_addr += \"$internalIP\"" > /tmp/step1.json
 jq --slurpfile instances /tmp/instances '.retry_join=$instances' < /tmp/step1.json > $CONF
 stop consul
 rm -rf /var/consul/*
 start consul
 sleep 10
done
echo "Consul Cluster is healtyh, leader is $(curl -s http://localhost:8500/v1/status/leader), cleaning up"
rm -f /tmp/instances $$ rm -f /tmp/*.json

bootstrap-consul.conf

start on runlevel [2345]

script
  /usr/local/bin/bootstrap-consul
end script

consul.conf

description "Consul agent"

start on runlevel [2345]
stop on runlevel [!2345]

respawn

script
  if [ -f "/etc/service/consul" ]; then
    . /etc/service/consul
  fi

  # Make sure to use all our CPUs, because Consul can block a scheduler thread
  export GOMAXPROCS=`nproc`

  # Get the public IP

  exec /usr/local/bin/consul agent \
    -config-dir="/etc/consul/config" \
    ${CONSUL_FLAGS} \
    >>/var/log/consul.log 2>&1
end script

user-data

#!/bin/bash
echo ECS_CLUSTER=dashing-ecs > /etc/ecs/ecs.config
sudo yum install -y nfs-utils
mkdir -p /mnt/dashboard
sudo mount -t nfs4 -o nfsvers=4.1 $(curl -s http://169.254.169.254/latest/meta-data/placement/availability-zone).*filesystem*.efs.eu-west-1.amazonaws.com:/ /mnt/dashboard