No log output if logfile setting is invalid (was: No host resolved when loglevel is set in headless mode)

[vkuehn]

Prerequisites

• I am using the latest version of Locust
• I am reporting a bug, not asking a question

Description

This works fine

locustfile = locustfile.py
headless = false
host = "http://localhost:8080"
process = 4
spawn-rate = 10
run-time = 5m
users = 100

when adding these debug settings

locustfile = locustfile.py
headless = false
host = "http://localhost:8080"
loglevel = DEBUG
logfile = locust.logfile
process = 4
spawn-rate = 10
run-time = 5m
users = 100

locust shows this and freezes

Error resolving address: [Errno 8] nodename nor servname provided, or not known

this does not happen in headless mode

Command line

locust --config local.conf

Locustfile contents

as shown

Python version

3.11.10

Locust version

2.32.1

Operating system

Mac OS 15.1 Build 24B83

[cyberw]

I guess adding quote marks doesnt help?

logfile = "locust.logfile"

What is the full output?

[vkuehn]

yes that did help and solve the issue.

The full output was just that line

Error resolving address: [Errno 8] nodename nor servname provided, or not known

nothing happend than as far I could see

and couldn't reproduce the issue now...sad but could be a pain for new users like me

[cyberw]

I'll reopen this in case anyone wants to have a go at it. What I'm thinking could be done is send output to stderr if logging setup fails like this.

I dont have time to look at it myself rn, but maybe later...