MySQL :: MySQL 8.4 Reference Manual :: 25.5.5 ndb_mgm — The NDB Cluster Management Client

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MySQL 8.4 Reference Manual / ... / ndb_mgm — The NDB Cluster Management Client

25.5.5 ndb_mgm — NDB 集群管理客户端

The ndb_mgm management client process is actually not needed to run the cluster. Its value lies in providing a set of commands for checking the cluster's status, starting backups, and performing other administrative functions. The management client accesses the management server using a C API. Advanced users can also employ this API for programming dedicated management processes to perform tasks similar to those performed by ndb_mgm.

To start the management client, it is necessary to supply the host name and port number of the management server:

$> ndb_mgm [host_name [port_num]]

For example:

$> ndb_mgm ndb_mgmd.mysql.com 1186

The default host name and port number are localhost and 1186, respectively.

All options that can be used with ndb_mgm are shown in the following table. Additional descriptions follow the table.

--backup-password-from-stdin[=TRUE|FALSE]

Command-Line Format	`--backup-password-from-stdin`

This option enables input of the backup password from the system shell (stdin) when using --execute "START BACKUP" or similar to create a backup. Use of this option requires use of --execute as well.

--character-sets-dir

Command-Line Format	`--character-sets-dir=path`

Directory containing character sets.

--connect-retries=#

Command-Line Format	`--connect-retries=#`
Type	Numeric
Default Value	`3`
Minimum Value	`0`
Maximum Value	`4294967295`

This option specifies the number of times following the first attempt to retry a connection before giving up (the client always tries the connection at least once). The length of time to wait per attempt is set using --connect-retry-delay.

This option is synonymous with the --try-reconnect option, which is now deprecated.

--connect-retry-delay

Command-Line Format	`--connect-retry-delay=#`
Type	Integer
Default Value	`5`
Minimum Value	`0`
Maximum Value	`5`

Number of seconds to wait between attempts to contact management server.

--connect-string

Command-Line Format	`--connect-string=connection_string`
Type	String
Default Value	`[none]`

Same as --ndb-connectstring.

--core-file

Command-Line Format	`--core-file`

Write core file on error; used in debugging.

--defaults-extra-file

Command-Line Format	`--defaults-extra-file=path`
Type	String
Default Value	`[none]`

Read given file after global files are read.

--defaults-file

Command-Line Format	`--defaults-file=path`
Type	String
Default Value	`[none]`

Read default options from given file only.

--defaults-group-suffix

Command-Line Format	`--defaults-group-suffix=string`
Type	String
Default Value	`[none]`

Also read groups with concat(group, suffix).

--encrypt-backup

Command-Line Format	`--encrypt-backup`

When used, this option causes all backups to be encrypted. To make this happen whenever ndb_mgm is run, put the option in the [ndb_mgm] section of the my.cnf file.

--execute=command, -e command

Command-Line Format	`--execute=command`

This option can be used to send a command to the NDB Cluster management client from the system shell. For example, either of the following is equivalent to executing SHOW in the management client:

$> ndb_mgm -e "SHOW"

$> ndb_mgm --execute="SHOW"

This is analogous to how the --execute or -e option works with the mysql command-line client. See Section 6.2.2.1, “Using Options on the Command Line”.

Note

If the management client command to be passed using this option contains any space characters, then the command must be enclosed in quotation marks. Either single or double quotation marks may be used. If the management client command contains no space characters, the quotation marks are optional.

--help

Command-Line Format	`--help`

Display help text and exit.

--login-path

Command-Line Format	`--login-path=path`
Type	String
Default Value	`[none]`

Read given path from login file.

--no-login-paths

Command-Line Format	`--no-login-paths`

Skips reading options from the login path file.

--ndb-connectstring

Command-Line Format	`--ndb-connectstring=connection_string`
Type	String
Default Value	`[none]`

Set connect string for connecting to ndb_mgmd. Syntax: [nodeid=id;][host=]hostname[:port]. Overrides entries in NDB_CONNECTSTRING and my.cnf.

--ndb-nodeid

Command-Line Format	`--ndb-nodeid=#`
Type	Integer
Default Value	`[none]`

Set node ID for this node, overriding any ID set by --ndb-connectstring.

--ndb-mgm-tls

Command-Line Format	`--ndb-mgm-tls=level`
Type	Enumeration
Default Value	`relaxed`
Valid Values	`relaxed` `strict`

Sets the level of TLS support required to connect to the management server; one of relaxed or strict. relaxed (the default) means that a TLS connection is attempted, but success is not required; strict means that TLS is required to connect.

--ndb-mgmd-host

Command-Line Format	`--ndb-mgmd-host=connection_string`
Type	String
Default Value	`[none]`

Same as --ndb-connectstring.

--ndb-optimized-node-selection

Command-Line Format	`--ndb-optimized-node-selection`

Enable optimizations for selection of nodes for transactions. Enabled by default; use --skip-ndb-optimized-node-selection to disable.

--ndb-tls-search-path

Command-Line Format	`--ndb-tls-search-path=list`
Type	Path name
Default Value (Unix)	`$HOME/ndb-tls`
Default Value (Windows)	`$HOMEDIR/ndb-tls`

Specify a list of directories to search for a CA file. On Unix platforms, the directory names are separated by colons (:); on Windows systems, the semicolon character (;) is used as the separator. A directory reference may be relative or absolute; it may contain one or more environment variables, each denoted by a prefixed dollar sign ($), and expanded prior to use.

Searching begins with the leftmost named directory and proceeds from left to right until a file is found. An empty string denotes an empty search path, which causes all searches to fail. A string consisting of a single dot (.) indicates that the search path limited to the current working directory.

If no search path is supplied, the compiled-in default value is used. This value depends on the platform used: On Windows, this is \ndb-tls; on other platforms (including Linux), it is $HOME/ndb-tls. This can be overridden by compiling NDB Cluster using -DWITH_NDB_TLS_SEARCH_PATH.

--no-defaults

Command-Line Format	`--no-defaults`

Do not read default options from any option file other than login file.

--print-defaults

Command-Line Format	`--print-defaults`

Print program argument list and exit.

--test-tls

Command-Line Format	`--test-tls`

Connect using TLS, then exit. Output if successful is similar to what is shown here:

>$ ndb_mgm --test-tls
Connected to Management Server at: sakila:1186
>$

See Section 25.6.15, “TLS Link Encryption for NDB Cluster”, for more information.

--try-reconnect=number

Command-Line Format	`--try-reconnect=#`
Deprecated	Yes
Type	Numeric
Type	Integer
Default Value	`12`
Default Value	`3`
Minimum Value	`0`
Maximum Value	`4294967295`

If the connection to the management server is broken, the node tries to reconnect to it every 5 seconds until it succeeds. By using this option, it is possible to limit the number of attempts to number before giving up and reporting an error instead.

This option is deprecated and subject to removal in a future release. Use --connect-retries, instead.

--usage

Command-Line Format	`--usage`

Display help text and exit; same as --help.

--version

Command-Line Format	`--version`

Display version information and exit.

Additional information about using ndb_mgm can be found in Section 25.6.1, “Commands in the NDB Cluster Management Client”.

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