Networking / Stage 6 of 14

From connection to application response

Not running Starting usually ~20 s

Step 7 of 7 · summary · 2 min

Summary

"The site is down" comes in three kinds: a refusal, a timeout and an application error answer, and curl prints each differently.
--connect-timeout and --max-time limit how long a check waits.
The HTTP status and curl's exit code are different numbers; with -f, a status of 400 or higher gives code 22.
A service check looks at the code, the status and the answer's text, and a report says where from, what and with which output the check ran.
At the start of the lesson the three complaints turned out to be three different stages: nobody listened on :8081, 192.0.2.99 was silent, and /health answered from the program: not-ready.

Ubuntu 24.04