A migration failed, a monitor is hitting a missing URL on web, and ticker prints a heartbeat. Read their logs.

web was started with -p 8080:80, so curl localhost:8080 reaches nginx from the host. Chapter 3 covers -p.

Read the stopped migration's output:

docker logs migrate

Search both of nginx's streams for the 404:

docker logs web 2>&1 | grep 404

Save every line about healthz (the access line and the error line):

docker logs web 2>&1 | grep healthz > ~/healthz.log

Watch the heartbeat live, then press Ctrl+C:

docker logs -f ticker

Save the last 3 heartbeats with timestamps:

docker logs -t --tail 3 ticker > ~/ticker-tail.txt