Elastic Beanstalk should stream logs to CloudWatch

How to fix it

In the console

Elastic Beanstalk → Environments → the environment → Configuration → Updates, monitoring, and logging → Instance log streaming to CloudWatch Logs

Log streaming

Enable

Retention

As long as your log retention policy requires (the default is 7 days)

Lifecycle

Keep logs after terminating environment

With the AWS CLI

aws elasticbeanstalk update-environment --environment-name <environment-name> --option-settings Namespace=aws:elasticbeanstalk:cloudwatch:logs,OptionName=StreamLogs,Value=true --region <region>

With Terraform

resource "aws_elastic_beanstalk_environment" "this" {
  name        = var.environment_name
  application = var.application_name

  setting {
    namespace = "aws:elasticbeanstalk:cloudwatch:logs"
    name      = "StreamLogs"
    value     = "true"
  }
}