Interacting With Application Servers

Author: Won Lee

Updated: Michelle

As you become more familiar with the Errigal environments and have begun working on either the operations or development team it is possible that you will be carrying out certain tasks related to application servers.

Examples of these tasks include starting, stopping, and restarting applications, tailing the logs to troubleshoot issues, and or investigating various directories on the servers.

This section will describe how to carry out each of these tasks.

There are a number of reasons for stopping and starting applications including troubleshooting an issue or implementing a configuration change.

The first time you do this task, be sure to consult with your mentor so you have someone beside you should you have any questions.

• The startup.sh script is responsible for starting up an application
• Each application has its own startup.sh.
• Note: Only the SnmpManager's startup.sh is required to be run by sudo. Any other applications don't need to be run as sudo.

• The shutdown.sh script is responsible for shutting down an application
• Like startup.sh, each application has its own one.
• Note: shutdown.sh for SnmpManager needs to be run by sudo and others don't.

• It is very important that you tail the application log and the catalina log when you start up or shutdown application.
• This allows you to monitor for any issues during the process
• You can tail log file by using the command: tail -f pathToLogFile

For more info on how to start and stop an application please refer to the following wiki entry: Restarting An Application Container

The following section outlines the file directory structure conventions of the most commonly used systems.

• /var/tomcat/ApplicationName/webapp/ApplicationName.war

• /var/tomcat/ApplicationName/bin/

• /home/scotty/appfiles/

• Application Log … /home/scotty/log/grails/ApplicationName.log
• Catalina Log … /var/tomcat/ApplicationName/log/catalina.out

• /var/tomcat/ApplicationName/webapp/ApplicationName.war

• /var/tomcat/ApplicationName/bin/

• /usr/local/appfiles/

• Application Log … /usr/local/logs/ApplicationName.log
• Catalina Log … /var/tomcat/ApplicationName/log/catalina.out