A load balancer and health checks

Not running Starting usually ~20 s

Step 3 of 10 · on a machine · 3 min

The copy is stopped

The on-call engineer's first urge is to stop the sick copy. See what happens to the site and what nginx writes to its error log.

Exercise · look

Stop the lab-backend@8082 service, request the site six times and read the nginx error log.

First, predict

Copy 8082 is stopped, 8081 is running. What will the loop of six requests print?

Now start the exercise, run the command and compare your prediction with the output.

Ubuntu 24.04