To create a system variable for the Axxon One server in the failover mode in Linux OS, do the following:

1. Stop the required server (see Suspending a Server within a cluster).
2. Go to the /etc/AxxonSoft directory.
3. Create a backup of the configuration:
   

   cp axxon-one.conf axxon-one.conf_bak

   This step is mandatory.

4. Open the server configuration file for editing:
   

   nano axxon-one.conf

5. Add the required variable as the first line in the configuration file:
   

   export %system_variable=value%

   For example, a variable to enable or disable the observer mode for the self-diagnostics service:
   

   export DRMONKEY_OBSERVER_MODE=0

   where 0—the observer mode is off, 1—the observer mode is on.
6. After you make the changes and save the configuration file, start the server.

As a result, the system variable is set permanently for the Axxon One server in the failover mode.