How is permission management handled in ZooKeeper?

The permission management in ZooKeeper is achieved through ACL (Access Control List). Each ZooKeeper node can have specific ACLs set to control who can read, write, create, delete, etc. on that node.

ZooKeeper supports several types of permission control methods.

1. No access control: this means that all clients are allowed to perform any operation on the node.
2. By IP address restrictions: You can specify that only clients with specific IP addresses can interact with the node.
3. Authentication is required via username and password. The client must provide a valid username and password in order to interact with the node.
4. By using ACL permissions control, it is possible to set ACL for each node, determining which specific users or groups have the authority to perform operations on the node, and specifying the exact permissions (read, write, create, delete, etc.).

With the aforementioned access control methods, fine-grained permission management can be applied to ZooKeeper nodes to protect the security of the node data according to actual needs.