How do I change the Controller user ID for a Controller install?

[#1]

Question

How do you change the Controller username for a Controller install for Linux on-premise?

Answer

To change the AppDynamics username complete the following steps:

1. Ensure that all AppDynamics processes are stopped.
2. Obtain the username and group name for the AppDynamics install.
3. Edit in the AppDynamics username into the db.cnf: 'user' option.
4. Run the following commands:
   

   cd <controller install>; chown -R <AppD username>:<AppD groupname>

5. Restart AppDynamics processes.
6. If the HA Toolkit is installed, then install the Linux services as root:
   

   cd HA; ./install-init.sh -s OR ./install-init.sh -c # to match earlier choice

Note that changing the install directory is basically a re-install.