This page describes how to install the Machine Agent on Linux systems that support the RPM Package Manager:

• CentOS
• RHEL
• Fedora
• openSUSE 

• SUSE Linux Enterprise Server

• AARCH

For Linux systems that do not support RPM, use the JRE Bundled Zip Archive.

The RPM installer makes these changes to the host machine:

• Creates an appdynamics-machine-agent group and an appdynamics-machine-agent user 
• Assigns ownership of certain files in the machine-agent directory to the appdynamics-machine-agent user

These changes are necessary to enable non-root users to configure and run an RPM-installed agent. To use a different user or group for the machine agent service, set the MACHINE_AGENT_USER and MACHINE_AGENT_GROUP environment variables in a shell for RPM installation.

sudo MACHINE_AGENT_USER=myuser MACHINE_AGENT_GROUP=mygroup rpm -ivh appdynamics-machine-agent.rpm

If the specified user or group does not exist, an error message appears and the RPM installation stops. To continue, you must define users and groups.
If this is an issue in your environment, then you install the agent using the ZIP archive (see Linux Install Using ZIP with Bundled JRE).

Install the Machine Agent

1. Before installing, review Install the Machine Agent.

2. Download and install the RPM Package. With administrative privileges, enter the following CLI code where <pkg-name.rpm> is the name of the package for your environment, such as appdynamics-machine-agent-<version>.x86_64.rpm. 

   sudo rpm -ivh <pkg-name.rpm>

   The agent files are installed in opt/appdynamics/machine-agent and the agent is added as a service.
   

3. Gather your configuration details and configure the agent by editing<machine_agent_home>/conf/controller-info.xml file or by adding system properties to the JVM startup script file.
   See Linux Install Using the RPM Package.

   1. (Required) Configure the Controller host name, port number, and account access key. 
   2. (Optional) Review memory requirements. See Machine Agent Requirements and Supported Environments.
      
   3. (Optional) Configure the agent to use SSL. See Enable SSL for Machine Agent.
   4. (Optional) Configure the agent to use proxy settings. See Machine Agent Configuration Properties.

   5. (Required for Multi-Tenant Mode or SaaS installations) Configure the Agent Account Information. See Multi-Tenant Controller Accounts.

   6. (Optional) Determine if you need to specify an application name and tier name. See Machine Agent Installation Scenarios.
      If you are installing the Machine Agent on the same server with any  app agent, do not specify application name and tier name.
4. Start the Agent. You can start the agent as a service (requires sudo or root user) or from the command line. If systemd was detected during installation, you can use the systemctl command to start the agent service. 
   • Using SysV – service appdynamics-machine-agent start
   • Using systemd – systemctl start appdynamics-machine-agent
   • From the Command Line – <machine_agent_home>/bin/machine-agent
   • From the Launcher – <machine_agent_home>/etc/init.d/appdynamics-machine-agent start

RPM Package Function

The RPM package manager creates the symbolic links to agent scripts and configuration files in the /etc directory. You can edit these links to accommodate a different installation directory, JRE, or system user account running the agent. 

Link for SysV Service Script

/etc/init.d/appdynamics-machine-agent >> /opt/appdynamics/machine-agent/etc/init.d/appdynamics-machine-agent

This script provides these service commands:

• Start – Starts the service, runs a script that starts the agent
• Stop – Stops the service
• Restart – Restarts the service
• Status – Returns the status of the service.

For example: service appdynamics-machine-agent start

Link for Environment Variables

SysV –  


/etc/sysconfig/appdynamics-machine-agent >> /opt/appdynamics/machine-agent/etc/sysconfig/appdynamics-machine-agent

This script sets up the environment variables: 

• MACHINE_AGENT_HOME=/opt/appdynamics/machine-agent – Specifies where the agent files are located.
• JAVA_HOME=/opt/appdynamics/machine-agent/jre – Specifies the JRE the agent uses. We recommend that you use the RPM package installer that contains its own JRE. However, you can use a different JRE as long as it meets the JRE requirements.
• MACHINE_AGENT_USER=root – Specifies the system user for starting the agent (default is root). We recommend that you create a non-root user to run the machine agent. The new user needs to have read-access to controller-info.xml and write access to the log file. See Permissions Required to Run the Machine Agent

systemd – The environment variables are in the service file: 

/etc/systemd/system/appdynamics-machine-agent.service >> /opt/appdynamics/machine-agent/etc/systemd/system/appdynamics-machine-agent.service

Link for Agent to Controller Communication

Sets up a link to the controller-info.xml file containing the properties for agent-to-controller communication.

/etc/appdynamics/machine-agent/controller-info.xml >> /opt/appdynamics/machine-agent/conf/controller-info.xml

Logging Configuration

The log4j.xml file controls the detail of information logged by the agent. By default, the logging level is set to info.

/etc/appdynamics/machine-agent/logging/log4j.xml >> /opt/appdynamics/machine-agent/conf/logging/log4j.xml

Adds the Agent as a Service

After the package is installed, the appdynamics-machine-agent runs opt/appdynamics/machine-agent/bin/postInstall.sh to add the agent to the services. The installer either copies the SysV script to add the service or, if systemd is detected, the installer copies the agent unit file /etc/systemd/system/appdynamics-machine-agent.service and adds the agent to the services using this unit file.

Installs a systemd Unit File for the Agent Service

If systemcd is detected on the system when you install the RPM package or run the postinstall.sh script, the systemd unit file for the agent service is copied to the following location: /etc/systemd/system/appdynamics-machine-agent.service

ExecStart: This option in the systemd service file points to a script that starts the agent as a daemon. If you did not install the Machine Agent in /opt/appdynamics/machine-agent, then change the path to <machine-agent-home>/scripts/machine-agent-daemon. If you did not edit the path, then it points to the correct place by default.

You can start and stop the agent service using the relevant systemctl commands. For information on all systemctl commands, see the systemctl man pages.