launch-dev-ec2-instance.sh

#!/usr/bin/env bash


cd
set -e


####################
# parameters
####################

# sg-167cec72: security group for dev environment in EC2
vpc_security_group_id="sg-167cec72"

# subnet-35760642: subnet for VPC 'vpc-89b6fbec' in 'us-west-2a'
# subnet-ef7d2f8a: subnet for VPC 'vpc-89b6fbec' in 'us-west-2b'
# subnet-a9901af0: subnet for VPC 'vpc-89b6fbec' in 'us-west-2c'
subnet_id="subnet-a9901af0"

# t2.micro: the cheapest type
instance_type="t2.micro"

# dev-env-key: the one for the dev environment
key_name="dev-env-key"

# ami-4cbc5b7f: our custom image named "ubuntu-14.04-base-5"
ami_id="ami-4cbc5b7f"
if [ "$1" != "" ]; then
	ami_id=$1
fi


####################
# create instance
####################

echo "creating instance from AMI $ami_id ..."
instance_id=$(\
	aws ec2 run-instances --image-id $ami_id --count 1 --instance-type $instance_type \
	--key-name $key_name --security-group-ids $vpc_security_group_id --subnet-id $subnet_id \
	--associate-public-ip-address \
	--query 'Instances[0].InstanceId' --output text)

echo "instance id: $instance_id"
# e.g. i-02c38cc4

echo "waiting for its public DNS..."
aws ec2 wait instance-running --instance-ids $instance_id
instance_public_dns=$(\
	aws ec2 describe-instances --instance-ids $instance_id \
	--query 'Reservations[0].Instances[0].PublicDnsName' --output text)

echo "instance public DNS: $instance_public_dns"
# e.g. ec2-52-26-149-233.us-west-2.compute.amazonaws.com

# add tag env=dev for the instance just created
aws ec2 create-tags --resources $instance_id --tags Key=env,Value=dev

echo ""
echo "command for connecting to instance (sometimes you have to wait a little before it works):"
echo "    ssh -i ~/.ssh/$key_name.pem ubuntu@$instance_public_dns"