Update elasticsearch.yml and launch the service

update-launch-es.sh

# Script to update elasticsearch.yml and launch the service. In this
# scenario the service is being launched inside a container on ec2
# but the technique is easily generalizable.
#
# Expects the following environment vars to be set inside the container
#
#   HOST_IP        - the IP address of the host running the container
#   AWS_ACCESS_KEY - the AWS account access key
#   AWS_SECRET_KEY - the AWS account secret key
#   CLUSTER_NAME   - the name of the ES cluster to join
#   

echo "Updating elasticsearch configuration..."
echo "Cluster name :" $CLUSTER_NAME
sed -i.bak -e"s:%1:${CLUSTER_NAME}:g" /etc/elasticsearch/elasticsearch.yml
echo "Host ip      :" $HOST_IP
sed -i.bak -e"s:%2:${HOST_IP}:g" /etc/elasticsearch/elasticsearch.yml
echo "Cloud key    :" $AWS_ACCESS_KEY
sed -i.bak -e"s:%3:${AWS_ACCESS_KEY}:g" /etc/elasticsearch/elasticsearch.yml
echo "Cloud secret :" $AWS_SECRET_KEY
sed -i.bak -e"s:%4:${AWS_SECRET_KEY}:g" /etc/elasticsearch/elasticsearch.yml
rm /etc/elasticsearch/elasticsearch.yml.bak
echo "Completed. Starting service..."
service elasticsearch start