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The directory contains the EUM Server installation files, configuration files, and data files. It is recommended to back up this directory as a precaution before upgrading or migrating the EUM Server. The default location of this directory is /AppDynamics/EUM, where is the directory where you installed the Controller. You can also use the backup-eum.sh script to back up the EUM Server data12. References: Upgrade the Production EUM Server, Configure the EUM Server

According to the Cisco AppDynamics Professional Implementer (CAPI) documents, the two methods that are available to define JVM options for an AppDynamics Controller so that the JVM options are retained across upgrades of the Controller are:

• Use the modifyJvmOptions utility provided by AppDynamics. (A) This is a valid method because the modifyJvmOptions utility is a script that allows you to add, remove, or list the JVM options for the Controller without manually editing any files. The utility also validates the syntax and format of the JVM options and creates a backup of the original configuration. The utility is located in the /bin directory and can be run on Linux or Windows platforms. The utility updates the /appserver/glassfish/domains/domain1/config/domain.xml file with the specified JVM options, which are preserved during the Controller upgrade12.
• Define JVM options on the Controller Settings page of the Enterprise Console. (B) This is a valid method because the Controller Settings page of the Enterprise Console is a graphical user interface that allows you to configure various settings for the Controller, including the JVM options. The Enterprise Console is a web-based application that provides a centralized way to manage the AppDynamics platform components, such as the Controller, the Events Service, and the EUM Server. The Enterprise Console also handles the Controller upgrade process and preserves the JVM options that are defined on the Controller Settings page34.

The incorrect options are:

• Pass JVM options to the Controller via java -javaagent:“options jar”. © This is not a valid method because the java -javaagent option is used to specify the path to the AppDynamics agent jar file, not the JVM options for the Controller. The agent jar file is used to instrumentthe Java applications that are monitored by the AppDynamics platform, not the Controller itself. The agent jar file also contains the agent configuration properties, such as the Controller host, port, account name, access key, and application name. Passing JVM options to the Controller via this option will not have any effect on the Controller performance or behavior5.
• Use the controller.sh script provided by AppDynamics. (D) This is not a valid method because the controller.sh script is used to start, stop, or restart the Controller, not to define the JVM options for the Controller. The controller.sh script is located in the /bin directory and can be run on Linux platforms. The controller.sh script does not accept any arguments or parameters for the JVM options, and does not update any configuration files with the JVM options. Using this script to define the JVM options for the Controller will not have any effect on the Controller performance or behavior6.
• Define JVM options manually in the domain. xmi file. (E) This is not a valid method because the domain. xmi file is not a configuration file for the JVM options for the Controller, but a configuration file for the WebSphere Application Server. The WebSphere Application Server is a Java EE application server that can be used to host the Java applications that are monitored by the AppDynamics platform, not the Controller itself. The domain. xmi file contains the settings for the WebSphere Application Server, such as the server name, port, security, data sources, and class loaders. Defining JVM options manually in this file will not have any effect on the Controller performance or behavior, and may cause errors or conflicts with the WebSphere Application Server configuration7.

References:

• 1: Modify JVM Options for the Controller - AppDynamics
• 2: Release Upgrade Checklist for Controllers - AppDynamics
• 3: Configure the Controller Using the Enterprise Console - AppDynamics
• 4: Upgrade the Controller Using the Enterprise Console - AppDynamics
• 5: Install the Java Agent - AppDynamics
• 6: Start and Stop the Controller - AppDynamics
• 7: Configuring the WebSphere Application Server - IBM

The AppDynamics Controller is a Java web application that runs on a GlassFish application server and uses a MySQL database. During the installation of the Controller, two user accounts are created by default:

• The GlassFish asadmin user is the administrative user for the GlassFish server. This user has the authority to start, stop, and configure the GlassFish server and its domains. The default username for this user is admin and the default password is appdynamics. You can change the password for this user after the installation by using the asadmin command-line tool1.
• The customer-specified Controller administrator account is the user account that you provide during the installation wizard. This is the account that you use to access the AppDynamics User Interface (UI) for the first time and perform various tasks such as creating applications, configuring agents, managing users and groups, and so on. You can choose any username and password for this account, but AppDynamics recommends using only ASCII characters. You can also create additional user accounts in the Controller UI after the installation2.

The other options are not user accounts that are created by the Controller installation. The Elastic search root user, the REST API user, and the MySQL appd admin user are user accounts that are used internally by the Controller components and are not exposed to the end user. The OS user that will run the controller is a user account that you need to create on the host machine before the installation, and it is not created by the Controller installation3. References: Controller Installation, Manage Users and Groups, and Update the Root User and Glassfish Admin Passwords in the AppDynamics documentation.