Log directives not working

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1

1. The problem I’m having:

When I try to configure the time format of logs, nothing happens. I don’t get an error message, the directives are simply not respected.

2. Error messages and/or full log output:

{"level":"info","ts":1740011348.4896889,"logger":"http.log.access.log0"

3. Caddy version:

v2.9.1

4. How I installed and ran Caddy:

a. System environment:

Windows Server 2025 Datacenter, version 10.0.2600 Build 26100

b. Command:

caddy run --config Caddyfile --environ --watch

c. Service/unit/compose file:

d. My complete Caddy config:

localhost:5000 {
	reverse_proxy 172.28.105.105:5000

	log {
		output file .\logs\access.log {
			roll_size 50MiB
			format json {
				time_format iso8601
				time_local
				duration_format ms
			}
		}
	}
}

5. Links to relevant resources:

2

Try forward slashes for the path? Try a full path instead of relative?

3

Hm, the log file is generated fine. And it does log when it proxies requests properly, it’s the timestamp that is in the wrong format. This is on a Windows machine.

4

Ah sorry I misread. I don’t see format ... documented as an option on the output file ... though, it should be a level up directly under log.

	log {
		output file .\logs\access.log {
			roll_size 50MiB
        }
		format json {
			time_format iso8601
			time_local
			duration_format ms
		}
	}
5

That fixed it! It was strange that the placement of format inside the output directive did not generate an error.

If you should want to proxy several paths, and want a separate logfile per path, would there be a way to set the format globally for all logs, so you don’t need to configure it inside every proxy directive?

6

Not that I know of - perhaps use a snippet? That’s almost the exact example given. Caddyfile Concepts — Caddy Documentation

7

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