Network Deployment (Distributed operating systems), v8.0 > Establishing high availability > Create a new core group (high availability domain)
Specify a core group when adding a node
By default, a cell contains a single core group. In this situation, during node federation, a node agent is created and automatically added to this core group. However, if the cell contains multiple core groups, specify the core group to which the node agent is assigned. If the cell to which you are adding a node agent contains multiple core groups, determine the core group to which you want this node agent to belong. You have a cell that contains multiple core groups and to select the core group to which a newly created node agent is added.
To add a newly created node agent to a specific core group:
Procedure
Include the coregroupname parameter on the addNode command. For example:
addNode dmgr_host dmgr_port -coregroupname existing_core_group_name
Results
The node agent resides in the specified core group.
Set up a high availability environment