CODEWITHSUNDEEP
node.jsdockerloggingdocker-compose
Molarro
Molarro

Reputation: 1047

Does Docker have log statuses, e.g. error, warn, info?

For example in Node.js container I do: throw new Error('lol'); or console.error('lol'); But when I open container logs: docker-compose logs -f nodejs there are no any statuses or colors like all logs have info status.

I use Datadog to collect logs from container - it also mark all logs as 'info'.

Upvotes: 0

Views: 819

Answers (1)

David Maze
David Maze

Reputation: 158977

docker logs and similar just collect the stdout and stderr streams from the main process running inside the container. There's not a "log level" associated with that, though some systems might treat or highlight the two streams differently.

As a basic example, you could run

docker run -d --name lister --rm busybox ls /
docker logs lister

The resulting file listing isn't especially "error" or "debug" level.

The production-oriented setups I'm used to include the log level in log messages (in a Node context, I've used the Winston logging library), and then use a tool like fluentd to collect and parse those messages.

Upvotes: 2

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