A simple deployment script for EC2 instances

deploy.sh

#!/bin/bash
# Updates all EC2 instances from git
# Author: [email protected]

CODE_LOCATION=/var/www/your_project
SERVER_PREFIX=your_project

# exit if something fails
set -e

if [ $# -gt 1 ]
then
  echo "Usage: `basename $0` [instance_type]"
  exit 1
fi

instance_type=$1

read -p "Are you sure you want to push code to production [y/N]? " -n 1 -r
echo -e
if [[ $REPLY =~ ^[Yy]$ ]]
then
  echo "Starting deployment..." 
else
  exit 0;
fi

echo "$(tput setaf 2)Running tests...$(tput sgr0)"
# RUN ALL TESTS HERE
echo "Done."

if [ -n "$instance_type" ]
then
  type_filter="--filter \"tag:Type=${instance_type}\""
  echo "$(tput setaf 2)Updating all instances of type ${instance_type}...$(tput sgr0)"
else
  echo "$(tput setaf 2)Updating all instances...$(tput sgr0)"
fi

# find all EC2 instances by type
for instance_id in $(ec2-describe-instances ${type_filter} --filter instance-state-name=running | grep INSTANCE | awk '{print $2}' ); do
  echo "$(tput setaf 3)Updating instance ${instance_id}...$(tput sgr0)"
  # get instance address
  instance_address=`ec2-describe-instances ${instance_id} | grep INSTANCE | awk '{print $4}'`
  echo "Instance address: $instance_address"
  # get instance type
  instance_type=`ec2-describe-instances ${instance_id} | grep Type | awk '{print $5}'`
  echo "Instance type: $instance_type"
  echo "Deploying and restarting servers..."

  # example deployment steps for instance of type 'www'
  if [ $instance_type == "www" ]; then
    ssh ${instance_address} 'bash' <<EOF
# Find al servers in the upstart directory
servers=`ls -la /etc/init/ | grep -oEi '${SERVER_PREFIX}[a-z]+'`
# Stop all servers
for server in $servers; do
  sudo stop $server
done
# Pull new code from git
cd ${CODE_LOCATION}; 
git pull; 
# Start all servers
for server in $servers; do
  sudo start $server
done
EOF
  fi

  echo "Finished updating instance ${instance_id}"
done

echo "Done."