Overriding Barracuda and Octopus default install and upgrade settings.

Once you have installed your Barracuda master instance and your first Octopus satellite instance, you will find two new handy configuration files .barracuda.cnf and .octopus.cnf have been created in the root users home directory.
Based on the options that you configured in the install scripts first time around, these configuration options will now come into play any time you run the Barracuda or Octopus scripts.

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Default Settings

The .barracuda.cnf contains two parts:

• The group of settings that cannot and will not be overridden.
• The group of settings that can and will be overridden.

The .octopus.cnf contains two parts:

• The group of settings that can and will be overridden.
• The group of settings that will be overriden by config files stored in the /data/disk/o1/log/ directory, but only on upgrade

Note:
*You will need to edit or comment out the _USER variable in this file when you wish to use the Octopus script to install or upgrade a different satellite instance.*

Also as defiantbyte points out: Along with the User variable you need to also comment out the _DOMAIN variable or else it will point the o1 domain at the o2 aegir instance.

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UPDATE:
As suggested by defiantbyte, the octopus.cnf file will now be created per Octopus instance, which in return solves the issue of needing to comment out the _USER and _DOMAIN variables. Related issue: http://drupal.org/node/1366564