Mysql：as of 8.0.14+：--admin-address、--admin-port、--create-admin-listener-thread

 

【不指定】该--admin-address选项（系统变量），则不会起该管理监听！！！

 

• admin_address

  Property	Value
  Command-Line Format	--admin-address=addr
  Introduced	8.0.14
  System Variable	admin_address
  Scope	Global
  Dynamic	No
  SET_VAR Hint Applies	No
  Type	String

  The IP address on which to listen for TCP/IP connections on the administrative network interface (see Section 8.12.4.1, “How MySQL Handles Client Connections”). There is no default admin_address value. If this variable is not specified at startup, the server maintains no administrative interface. The server also has a bind_address system variable for configuring regular (nonadministrative) client TCP/IP connections. See Section 8.12.4.1, “How MySQL Handles Client Connections”.

  If admin_address is specified, its value must satisfy these requirements:

  • The value must be a single IPv4 address, IPv6 address, or host name.

  • The value cannot specify a wildcard address format (*, 0.0.0.0, or ::).

  An IP address can be specified as an IPv4 or IPv6 address. If the value is a host name, the server resolves the name to an IP address and binds to that address. If a host name resolves to multiple IP addresses, the server uses the first IPv4 address if there are any, or the first IPv6 address otherwise.

  The server treats different types of addresses as follows:

  • If the address is an IPv4-mapped address, the server accepts TCP/IP connections for that address, in either IPv4 or IPv6 format. For example, if the server is bound to ::ffff:127.0.0.1, clients can connect using --host=127.0.0.1 or --host=::ffff:127.0.0.1.

  • If the address is a “regular” IPv4 or IPv6 address (such as 127.0.0.1 or ::1), the server accepts TCP/IP connections only for that IPv4 or IPv6 address.

  If binding to the address fails, the server produces an error and does not start.

  The admin_address system variable is similar to the bind_address system variable that binds the server to an address for ordinary client connections, but with these differences:

  • bind_address permits multiple addresses. admin_address permits a single address.

  • bind_address permits wildcard addresses. admin_address does not.

• admin_port

  Property	Value
  Command-Line Format	--admin-port=port_num
  Introduced	8.0.14
  System Variable	admin_port
  Scope	Global
  Dynamic	No
  SET_VAR Hint Applies	No
  Type	Integer
  Default Value	33062
  Minimum Value	0
  Maximum Value	65535

  The TCP/IP port number to use for connections on the administrative network interface (see Section 8.12.4.1, “How MySQL Handles Client Connections”). Setting this variable to 0 causes the default value to be used.

  Setting admin_port has no effect if admin_address is not specified because in that case the server maintains no administrative network interface.

• create_admin_listener_thread

  Property	Value
  Command-Line Format	--create-admin-listener-thread[={OFF|ON}]
  Introduced	8.0.14
  System Variable	create_admin_listener_thread
  Scope	Global
  Dynamic	No
  SET_VAR Hint Applies	No
  Type	Boolean
  Default Value	OFF

  Whether to use a dedicated listening thread for client connections on the administrative network interface (see Section 8.12.4.1, “How MySQL Handles Client Connections”). The default is to implement the administrative interface using the listener thread used for ordinary connections.

  Depending on factors such as platform type and workload, you may find one setting for this variable yields better performance than the other setting.

  Setting create_admin_listener_thread has no effect if admin_address is not specified because in that case the server maintains no administrative network interface.