What must be consistent when installing the second Vault cluster node?

When installing the second Vault cluster node, the Vault-id parameter must be consistent across the nodes in the cluster. The Vault-id is a critical identifier for the cluster that ensures the nodes can communicate and recognize each other correctly. This parameter is essential for maintaining the integrity of the data and configurations stored within the cluster, as it helps prevent conflicts and ensures that all nodes function as a cohesive unit.

The consistency of the Vault-id is foundational to the clustering process, as it allows for proper coordination and synchronization of tasks and data across the cluster. If the Vault-id were to differ between nodes, it would create challenges in establishing a reliable connection and could lead to failures or unexpected behavior in the cluster.

In contrast, while aspects such as server clock times, network bandwidth, and user permissions are important for the overall performance and security of the system, they do not directly impact the fundamental ability of the cluster nodes to identify and interact with one another like the Vault-id does. Therefore, the emphasis on the consistency of the Vault-id is crucial in a clustered environment.