No log colors

[0x19dG87]

Description

log-color does not work in docker container. docker logs <container-name> does not have any colorisation.

Version

Lighthouse: v7.1.0
Docker Image: sigp/lighthouse:latest
Docker: v28.4.0

Present Behaviour

docker logs <container-name>

Logs are displayed without colors while running lighthouse in docker

Colored output example for reth

Expected Behaviour

Logs should have colors as per log-color parameter description

[michaelsproul]

Are you using --log-color true or relying on the default? From memory we disable colour by default if stdout is not interactive (i.e. Docker, systemd, etc)

The docs for --log-color might need an update if it works when you provide the flag.

[0x19dG87]

I created this issue immediately after attempting to set the flag to true. Yes, it does not work.

[michaelsproul]

Ok, we can investigate

[ackintosh]

Note for myself:
Lighthouse determines whether to color the logs by checking stdin().is_terminal() here.
Reth uses the RUST_LOG_STYLE environment variable — it colors the logs unless RUST_LOG_STYLE is set to never.

[ackintosh]

@0x19dG87 Could you try using --tty, a docker run option that allocates a pseudo-TTY?

docker run --tty ...