Userdata snippet to add register and deregister commands to an ubuntu instance in aws

register_deregister_userdata.json

"cat << EOF > /etc/init.d/register_with_elb\n",
"#!/bin/bash\n",
"aws elb register-instances-with-load-balancer --load-balancer-name ",
{
    "Ref": "LoadBalancerName"
},
" --instances $(wget -q -O- http://169.254.169.254/latest/meta-data/instance-id) --region ",
{
    "Ref": "AWS::Region"
},
"\n",
"EOF\n",
"chmod +x /etc/init.d/register_with_elb && update-rc.d register_with_elb start 19 2 3 4 5 . \n",
"cat << EOF > /etc/init.d/deregister_from_elb\n",
"#!/bin/bash\n",
"aws elb deregister-instances-from-load-balancer --load-balancer-name ",
{
    "Ref": "LoadBalancerName"
},
" --instances $(wget -q -O- http://169.254.169.254/latest/meta-data/instance-id) --region ",
{
    "Ref": "AWS::Region"
},
"\n",
"EOF\n",
"chmod +x /etc/init.d/deregister_from_elb && update-rc.d deregister_from_elb start 19 0 6 . \n",
"\n"