Script to update AWS Route 53 record set on startup of Lightsail instance.
The public IP address given to a Lightsail instance changes after an instance stops and starts again. This causes any Route53 recordsets to become instantly outdated. An easy fix is to use (VPC) Elastic IPs, which stick with the EC2 after a restart; however, you can only have 5 per region and need a good excuse when asking Amazon to increase it.
Pre-requisites
IAM Role
AWS CLI
Download the Script
Update Script Variables
Set Script Permissions
Add to Runlevels
References
We are using DNSManagers_NCCER.
We have three NCCER policies, one for each domain in Route53. BYF domain is separate.
Install the AWS CLI
unzip awscliv2.zip
sudo ./aws/install
### AWS ClI is already correctly configured Configure the AWS CLI using sudo so that the configuration applies to root. ```sudo aws configure``` TODO: Add instructions for service-linked role configuration (https://lightsail.aws.amazon.com/ls/docs/en_us/articles/amazon-lightsail-using-service-linked-roles)
Download the script into your /etc/init.d directory.
sudo curl --location "https://raw.githubusercontent.com/nccer-org/update-route53/master/update-route53.sh" --output /etc/init.d/update-route53.sh Update the ZONEID and RECORDSET variables in the script to reflect the Zone and Route53 record you want to change.
Give the script execute permissions.
sudo chmod +x /etc/init.d/update-route53.shAdd the script to the default runlevels so it will be called at runtime.
sudo update-rc.d update-route53.sh defaultsNote: To remove the script from runlevels...
sudo update-rc.d /etc/init.d/update-route53.sh remove
### Testing Functionality IP addresses dont usually change when you reboot. To force an IP change on an existing instance, stop the instance, wait until it has completely shut down, then start it again. This will cause a new IP to be applied, and the script will update DNS.
If something doesn't work, check the log file as configured
Creating the script:
Running script at startup:
- http://xmodulo.com/how-to-automatically-start-program-on-boot-in-debian.html
- https://www.cyberciti.biz/tips/linux-how-to-run-a-command-when-boots-up.html
- http://askubuntu.com/questions/409025/permission-denied-when-running-sh-scripts
AWS Command Line Interface Installation:
- http://docs.aws.amazon.com/cli/latest/userguide/aws-cli.pdf
- http://docs.aws.amazon.com/cli/latest/userguide/awscli-install-linux.html
AWS IAM Policies:
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