Before installing the second cluster node, what action is necessary?

Before installing the second cluster node, it is necessary to stop all services on the first node. This action ensures that the system remains in a consistent and stable state during the installation process. When adding a new cluster node, it is vital to avoid any data inconsistency or conflicts that may arise from ongoing operations or transactions on the first node. By halting services, you effectively create a controlled environment, which minimizes the risk of data corruption and facilitates a smoother integration of the new node into the existing cluster.

While other actions, such as updating server firmware, performing a database backup, or installing additional storage, can be important steps within the broader setup or maintenance process, stopping services is specifically crucial right before the addition of a new cluster node to ensure integrity and reliability during the transition.