Stream logs during --wait

[felipecrs]

The addition of --wait (#8777) was nice. But it would be especially helpful in CI/CD environments if the logs were streamed during the "wait".

For example, I'm trying to start an Oracle DB with --wait and it's not working. On CI/CD it's almost impossible to capture the logs for it unless I do some very weird trickery of running docker compose logs -f in parallel.

I understand that --wait implies --detach, but I guess it does not need to be the case until the --wait condition is met.

[felipecrs]

Or some additional flag like --wait --logs would also do the trick.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[felipecrs]

:-(

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This issue has been automatically closed because it had not recent activity during the stale period.

[luishdz1010]

Should be re-opened

[felipecrs]

Yes, please!

[felipecrs]

Out of curiosity, I built a simple Bash script that accomplishes the task at some sort:

#!/usr/bin/env bash

set -euo pipefail

container_name="${1}"

max_attempts="${2:-120}"

# Display logs while we wait for the container to be healthy
docker logs --follow "${container_name}" &
docker_logs_pid="${!}"

function cleanup() {
    # do not fail if the process has already exited
    kill "${docker_logs_pid}" 2>/dev/null || true
}

# Cleanup log process on exit
trap 'cleanup' EXIT

# Wait for container to be healthy
attempt=0
while true; do
    status=$(docker inspect --format '{{.State.Health.Status}}' "${container_name}" || true)
    if [[ "${status}" == "healthy" ]]; then
        cleanup
        echo "Container ${container_name} is healthy after ${attempt} seconds"
        exit 0
    elif [[ "${status}" != "starting" ]]; then
        attempt=$(( attempt + 1 ))
        if [[ "${attempt}" -ge "${max_attempts}" ]]; then
            cleanup
            echo "Container ${container_name} is not healthy after ${attempt} seconds"
            echo "Last healthcheck logs:"
            docker inspect --format '{{json .State.Health}}' "${container_name}"
            exit 1
        fi
    fi
    sleep 1
done

It has proven to be extremely helpful for debugging issues during CI pipelines. And it would be even better if docker-compose have built-in support for it.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[felipecrs]

Please don't let this stall :)

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This issue has been automatically marked as not stale anymore due to the recent activity.

[ndeloof]

The challenge here is that we can't dump logs to the console while rendering the "progress" UI showing resource status.

[felipecrs]

@ndeloof, perhaps some inspiration can be taken from the way how docker build display logs while progressing.

[WebF0x]

@ndeloof AFTER the docker compose up --wait --logs command fails, could we dump the logs of the healthcheck-failing containers?

Could be an easier first step and help troubleshoot most cases.