Firelens is a log router for Amazon Elastic Container Service (Amazon ECS) and AWS Fargate. You can use Firelens to route container logs from Amazon ECS to Amazon CloudWatch and other destinations (for example, Splunk or Sumo Logic). Firelens works with Fluentd or Fluent Bit as the logging agent, which means that you can use Amazon ECS task definition parameters to route logs.
By choosing to parse logs at the source level, you can analyze your logging data and perform queries to more efficiently and effectively respond to operational issues. Because different applications have different logging patterns, you need to use a custom parser that structures the logs and makes searching easier at your end destination.
This pattern uses a Firelens log router with a custom parser to push logs to CloudWatch from a sample Spring Boot application running on Amazon ECS. You can then use Amazon CloudWatch Logs Insights to filter the logs based on custom fields that are generated by the custom parser.
