AWS CloudWatch 日志流为空，而 Docker 容器日志已满

Question

I'm creating cron docker image, based on ubuntu image. I would use this tutorial, but cron won't have PID 1, not 2 and not even 10. I found a solution to run cron in foreground, check it using healthcheck and view logs of command using tail -f Locally all is perfect, but when I deploy it to ECS Fargate logs are empty

Main issue

docker logs -f cron displays output, but logs in cloudwatch are empty

Additional information

I created Dockerfile with following ENTRYPOINT and CMD

COPY crontab /etc/crontab
COPY script.sh /root/script.sh
ENTRYPOINT ["tini", "--", "/usr/bin/docker-entrypoint.sh"]
CMD prepare.sh tail -f /var/log/script.log 

prepare.sh content:

# some preparation commands...
cron -L 15
exec "$@"

docker-entrypoint.sh also has at the end exec "$@" .

crontab content:

*/3 *  * * * root /root/script.sh >> /var/log/script.log

So, the last command is tail -f /var/log/script.log

Answer 1

In order for your container's logs to appear in CloudWatch logs, you need to setup your Task Definition to use the awslogs log driver.

Documentation on how to do this can be found here .