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24.11. Troubleshooting

24.11.1. About Troubleshooting Amazon EC2

EC2 provides an Alarm Status for each instance, indicating severe instance malfunction but the absence of such an alarm is no guarantee that the instance has started correctly and services are running properly. It is possible to use Amazon CloudWatch with its custom metric functionality to monitor instance services' health but use of an enterprise management solution is recommended.
To simplify troubleshooting, Red Hat recommends managing the EC2 instance using JBoss Operations Network (JON) which can automatically discover, monitor and manage many services on an EC2 instance with the JON agent installed, including: JBoss EAP 6, Tomcat, Apache HTTP Server, and PostgreSQL. For details of monitoring JBoss EAP with JON, see Section 24.9.1, “About AMI Monitoring”.

24.11.2. Diagnostic Information

In case of a problem being detected by the JBoss Operations Network, Amazon CloudWatch or manual inspection, common sources of diagnostic information are:
  • /var/log/jboss_user-data.out is the output of the jboss-ec2-eap init script and user custom configuration script.
  • /var/cache/jboss-ec2-eap/ contains the actual user data, custom script, and custom CLI commands used at instance start-up.
  • /var/log also contains all the logs collected from machine start up, JBoss EAP 6, httpd and most other services.
Access to these files is only available via an SSH session. Refer to the Amazon EC Getting Started Guide for details on how to configure and establish an SSH session with an Amazon EC2 instance.