The Clone Plugin Specifies the path to the private key file. Used to configure an encrypted connection for a remote cloning operation. This setting configured on the recipient and used when connecting to the donor. Defines valid donor host addresses for remote cloning operations. This setting is applied on the recipient MySQL server instance. A comma-separated list of values is permitted in the following format: “ HOST1:PORT1,HOST2:PORT2,HOST3:PORT3 ” . Spaces are not permitted. The  clone_valid_donor_list  variable adds a layer of security by providing control over the sources of cloned data. The privilege required to configure  clone_valid_donor_list  is different from the privilege required to execute remote cloning operations, which permits assigning those responsibilities to different roles. Configuring  clone_valid_donor_list  requires the  SYSTEM_VARIABLES_ADMIN privilege, whereas executing a remote cloning operation requires the  CLONE_ADMIN  privilege. Internet Protocol version 6 (IPv6) address format is not supported. Internet Protocol version 6 (IPv6) address format is not supported. An alias to the IPv6 address can be used instead. An IPv4 address can be used as is. The clone plugin is subject to these limitations: •DDL, including  TRUNCATE TABLE , is not permitted during a cloning operation. This limitation should be considered when selecting data sources. A workaround is to use dedicated donor instances, which can accommodate DDL operations being blocked while data is cloned. Concurrent DML is permitted. •An instance cannot be cloned from a different MySQL server version or release. The donor and recipient must have exactly the same MySQL server version and release. For example, you cannot clone between MySQL 5.7 and MySQL 8.0, or between MySQL 8.0.19 and MySQL 8.0.20. The clone plugin is only supported in MySQL 8.0.17 and higher. •Only a single MySQL instance can be cloned at a time. Cloning multiple MySQL instances in a single cloning operation is not supported. •The X Protocol port specified by  mysqlx_port  is not supported for remote cloning operations (when specifying the port number of the donor MySQL server instance in a  CLONE INSTANCE  statement). •The clone plugin does not support cloning of MySQL server configurations. The recipient MySQL server instance retains its configuration, including persisted system variable settings (see Section 5.1.9.3, “Persisted System Variables” .) 5.6.7.13 Clone Plugin Limitations • clone_valid_donor_list Type File name Default Value empty string Command-Line Format --clone-valid-donor-list=value Introduced 8.0.17 System Variable clone_valid_donor_list Scope Global Dynamic Yes SET_VAR  Hint Applies No Type String Default Value NULL 1134