4.2 - Load balance the front-end
Return to the Lightsail console home page and choose Networking from the horizontal menu and click on the name of your previously-created load balancer.
Under Target instances choose PHP-fe-1 from the dropdown list
Click Attach
Click Attach another
Repeat the previous three steps for PHP-fe-2 and PHP-fe-3
It will take several minutes for all three instances to register their health checks as Passed once this has happened, move to the next step
From the top of the screen copy the long string following DNS name:. This is the URL for your Lightsail load balancer. Any requests to this URL will be routed to one of your three front end instances.
Paste the string into a web browser, the Todo application should come up. Reload the page and notice how the host name at the bottom of the screen changes - this indicates that traffic is being routed appropriately.