NDB_CONFIG(1)						       MySQL Database System						     NDB_CONFIG(1)

NAME

       ndb_config - extract MySQL Cluster configuration information

SYNOPSIS

       ndb_config options

DESCRIPTION

       This tool extracts current configuration information for data nodes, SQL nodes, and API nodes from one of a number of sources: a MySQL
       Cluster management node, or its config.ini or my.cnf file. By default, the management node is the source for the configuration data; to
       override the default, execute ndb_config with the --config-file or --mycnf option. It is also possible to use a data node as the source by
       specifying its node ID with --config_from_node=node_id.

       ndb_config can also provide an offline dump of all configuration parameters which can be used, along with their default, maximum, and
       minimum values and other information. The dump can be produced in either text or XML format; for more information, see the discussion of
       the --configinfo and --xml options later in this section).

       You can filter the results by section (DB, SYSTEM, or CONNECTIONS) using one of the options --nodes, --system, or --connections.

       The following table includes options that are specific to ndb_config. Additional descriptions follow the table. For options common to most
       MySQL Cluster programs (including ndb_config), see Options Common to MySQL Cluster Programs(1).

       Table 17.15. ndb_config Options and Variables: MySQL Cluster NDB 7.2
       +----------------------------+--------------------------------------+-------------------------------------+
       |Format			    | Description			   | Added / Removed			 |
       +----------------------------+--------------------------------------+-------------------------------------+
       |			    | Print node information (DB section)  |					 |
       |       --nodes		    | only.				   |	    All MySQL 5.5 based releases |
       +----------------------------+--------------------------------------+-------------------------------------+
       |			    | Print CONNECTIONS section 	   |					 |
       |       --connections	    | information only. Cannot be used	   |	    All MySQL 5.5 based releases |
       |			    | with --nodes			   |					 |
       |			    |		  or --system option.	   |					 |
       +----------------------------+--------------------------------------+-------------------------------------+
       |			    | One or more query options 	   |					 |
       |       --query=string,	    | (attributes)			   |	    All MySQL 5.5 based releases |
       |			    |					   |					 |
       |       -q		    |					   |					 |
       +----------------------------+--------------------------------------+-------------------------------------+
       |			    | Specify host			   |					 |
       |       --host=name	    |					   |	    All MySQL 5.5 based releases |
       +----------------------------+--------------------------------------+-------------------------------------+
       |			    | Specify node type 		   |					 |
       |       --type=name	    |					   |	    All MySQL 5.5 based releases |
       +----------------------------+--------------------------------------+-------------------------------------+
       |			    | Get configuration of node with this  |					 |
       |       --nodeid,	    | ID				   |	    All MySQL 5.5 based releases |
       |			    |					   |					 |
       |       --id		    |					   |					 |
       +----------------------------+--------------------------------------+-------------------------------------+
       |			    | Field separator			   |					 |
       |       --fields=string,     |					   |	    All MySQL 5.5 based releases |
       |			    |					   |					 |
       |       -f		    |					   |					 |
       +----------------------------+--------------------------------------+-------------------------------------+
       |			    | Row separator			   |					 |
       |       --rows=string,	    |					   |	    All MySQL 5.5 based releases |
       |			    |					   |					 |
       |       -r		    |					   |					 |
       +----------------------------+--------------------------------------+-------------------------------------+
       |			    | Set the path to config.ini file	   |					 |
       |       --config-file=path   |					   |	    All MySQL 5.5 based releases |
       +----------------------------+--------------------------------------+-------------------------------------+
       |			    | Read configuration data from my.cnf  |					 |
       |       --mycnf		    | file				   |	    All MySQL 5.5 based releases |
       +----------------------------+--------------------------------------+-------------------------------------+
       |			    | Short form for --ndb-connectstring   |					 |
       |       -c		    |					   |	    All MySQL 5.5 based releases |
       +----------------------------+--------------------------------------+-------------------------------------+
       |			    | Dumps information about all NDB	   |					 |
       |       --configinfo	    | configuration parameters in text	   |	    All MySQL 5.5 based releases |
       |			    | format				   |					 |
       |			    |		  with default, maximum,   |					 |
       |			    | and minimum values. Use with --xml   |					 |
       |			    | to				   |					 |
       |			    |		  obtain XML output.	   |					 |
       +----------------------------+--------------------------------------+-------------------------------------+
       |			    | Use --xml with --configinfo to	   |					 |
       |       --configinfo --xml   | obtain a dump of all NDB		   |	    All MySQL 5.5 based releases |
       |			    | configuration			   |					 |
       |			    |		  parameters in XML format |					 |
       |			    | with default, maximum, and minimum   |					 |
       |			    |		  values.		   |					 |
       +----------------------------+--------------------------------------+-------------------------------------+
       |			    | Print SYSTEM section information	   |					 |
       |       --system 	    | only. Cannot be used with --nodes or |	    All MySQL 5.5 based releases |
       |			    |		  --connections option.    |					 |
       +----------------------------+--------------------------------------+-------------------------------------+
       |			    | Obtain configuration data from the   |					 |
       |       --config_from_node=# | node having this ID (must be a data  |	    All MySQL 5.5 based releases |
       |			    |		  node).		   |					 |
       +----------------------------+--------------------------------------+-------------------------------------+

       o   --usage, --help, or -?

	   +--------------------+-----------+
	   |Command-Line Format | --help    |
	   +--------------------+-----------+
	   |			| --usage   |
	   +--------------------+-----------+
	   |			| -?	    |
	   +--------------------+-----------+
	   Causes ndb_config to print a list of available options, and then exit.

       o   --config_from_node=#

	   +--------------------+----------------------+
	   |Command-Line Format | --config_from_node=# |
	   +--------------------+----------------------+
	   |			| Permitted Values     |
	   |			+----------+-----------+
	   |			| Type	   | numeric   |
	   |			+----------+-----------+
	   |			| Default  | none      |
	   |			+----------+-----------+
	   |			| Range    | 1 .. 48   |
	   +--------------------+----------+-----------+
	   Obtain the cluster's configuration data from the data node that has this ID.

	   If the node having this ID is not a data node, ndb_config fails with an error. (To obtain configuration data from the management node
	   instead, simply omit this option.)

       o   --version, -V

	   +--------------------+-----------+
	   |Command-Line Format | --version |
	   +--------------------+-----------+
	   |			| -V	    |
	   +--------------------+-----------+
	   Causes ndb_config to print a version information string, and then exit.

       o   --ndb-connectstring=connect_string, -c connect_string

	   +--------------------+-----------------------------------+
	   |Command-Line Format | --ndb-connectstring=connectstring |
	   +--------------------+-----------------------------------+
	   |			| --connect-string=connectstring    |
	   +--------------------+-----------------------------------+
	   |			| -c				    |
	   +--------------------+-----------------------------------+
	   |			| Permitted Values		    |
	   |			+------------+----------------------+
	   |			| Type	     | string		    |
	   |			+------------+----------------------+
	   |			| Default    | localhost:1186	    |
	   +--------------------+------------+----------------------+
	   Specifies the connection string to use in connecting to the management server. The format for the connection string is the same as
	   described in Section 17.3.2.3, "MySQL Cluster Connection Strings", and defaults to localhost:1186.

       o   --config-file=path-to-file

	   +--------------------+---------------------+
	   |Command-Line Format | --config-file=path  |
	   +--------------------+---------------------+
	   |			| Permitted Values    |
	   |			+---------+-----------+
	   |			| Type	  | file name |
	   |			+---------+-----------+
	   |			| Default |	      |
	   +--------------------+---------+-----------+
	   Gives the path to the management server's configuration file (config.ini). This may be a relative or absolute path. If the management
	   node resides on a different host from the one on which ndb_config is invoked, then an absolute path must be used.

       o   --mycnf

	   +--------------------+-------------------+
	   |Command-Line Format | --mycnf	    |
	   +--------------------+-------------------+
	   |			| Permitted Values  |
	   |			+---------+---------+
	   |			| Type	  | boolean |
	   |			+---------+---------+
	   |			| Default | FALSE   |
	   +--------------------+---------+---------+
	   Read configuration data from the my.cnf file.

       o   --query=query-options, -q query-options

	   +--------------------+------------------+
	   |Command-Line Format | --query=string   |
	   +--------------------+------------------+
	   |			| -q		   |
	   +--------------------+------------------+
	   |			| Permitted Values |
	   |			+---------+--------+
	   |			| Type	  | string |
	   |			+---------+--------+
	   |			| Default |	   |
	   +--------------------+---------+--------+
	   This is a comma-delimited list of query options--that is, a list of one or more node attributes to be returned. These include id (node
	   ID), type (node type--that is, ndbd, mysqld, or ndb_mgmd), and any configuration parameters whose values are to be obtained.

	   For example, --query=id,type,indexmemory,datamemory returns the node ID, node type, DataMemory, and IndexMemory for each node.

	       Note
	       If a given parameter is not applicable to a certain type of node, than an empty string is returned for the corresponding value. See
	       the examples later in this section for more information.

       o   --host=hostname

	   +--------------------+------------------+
	   |Command-Line Format | --host=name	   |
	   +--------------------+------------------+
	   |			| Permitted Values |
	   |			+---------+--------+
	   |			| Type	  | string |
	   |			+---------+--------+
	   |			| Default |	   |
	   +--------------------+---------+--------+
	   Specifies the host name of the node for which configuration information is to be obtained.

	       Note
	       While the hostname localhost usually resolves to the IP address 127.0.0.1, this may not necessarily be true for all operating
	       platforms and configurations. This means that it is possible, when localhost is used in config.ini, for ndb_config --host=localhost
	       to fail if ndb_config is run on a different host where localhost resolves to a different address (for example, on some versions of
	       SUSE Linux, this is 127.0.0.2). In general, for best results, you should use numeric IP addresses for all MySQL Cluster
	       configuration values relating to hosts, or verify that all MySQL Cluster hosts handle localhost in the same fashion.

       o   --id=node_id

	   --nodeid=node_id

	   +--------------------+-------------------+
	   |Command-Line Format | --ndb-nodeid=#    |
	   +--------------------+-------------------+
	   |			| Permitted Values  |
	   |			+---------+---------+
	   |			| Type	  | numeric |
	   |			+---------+---------+
	   |			| Default | 0	    |
	   +--------------------+---------+---------+
	   Either of these options can be used to specify the node ID of the node for which configuration information is to be obtained.  --nodeid
	   is the preferred form.

       o   --nodes

	   +--------------------+-------------------+
	   |Command-Line Format | --nodes	    |
	   +--------------------+-------------------+
	   |			| Permitted Values  |
	   |			+---------+---------+
	   |			| Type	  | boolean |
	   |			+---------+---------+
	   |			| Default | FALSE   |
	   +--------------------+---------+---------+
	   Tells ndb_config to print information from parameters defined in DB sections only. This option cannot be used together with
	   --connections or --system.

       o   --connections

	   +--------------------+-------------------+
	   |Command-Line Format | --connections     |
	   +--------------------+-------------------+
	   |			| Permitted Values  |
	   |			+---------+---------+
	   |			| Type	  | boolean |
	   |			+---------+---------+
	   |			| Default | FALSE   |
	   +--------------------+---------+---------+
	   Tells ndb_config to print CONNECTIONS information only. This option cannot be used together with --nodes or --system.

       o   --system

	   +--------------------+-------------------+
	   |Command-Line Format | --system	    |
	   +--------------------+-------------------+
	   |			| Permitted Values  |
	   |			+---------+---------+
	   |			| Type	  | boolean |
	   |			+---------+---------+
	   |			| Default | FALSE   |
	   +--------------------+---------+---------+
	   Tells ndb_config to print SYSTEM information only.

	   This option cannot be used together with the --nodes or --system options.

       o   --type=node_type

	   +--------------------+----------------------------+
	   |Command-Line Format | --type=name		     |
	   +--------------------+----------------------------+
	   |			| Permitted Values	     |
	   |			+--------------+-------------+
	   |			| Type	       | enumeration |
	   |			+--------------+-------------+
	   |			| Default      |	     |
	   |			+--------------+-------------+
	   |			| Valid Values | ndbd	     |
	   |			|	       +-------------+
	   |			|	       | mysqld      |
	   |			|	       +-------------+
	   |			|	       | ndb_mgmd    |
	   +--------------------+--------------+-------------+
	   Filters results so that only configuration values applying to nodes of the specified node_type (ndbd, mysqld, or ndb_mgmd) are
	   returned.

       o   --fields=delimiter, -f delimiter

	   +--------------------+------------------+
	   |Command-Line Format | --fields=string  |
	   +--------------------+------------------+
	   |			| -f		   |
	   +--------------------+------------------+
	   |			| Permitted Values |
	   |			+---------+--------+
	   |			| Type	  | string |
	   |			+---------+--------+
	   |			| Default |	   |
	   +--------------------+---------+--------+
	   Specifies a delimiter string used to separate the fields in the result. The default is "," (the comma character).

	       Note
	       If the delimiter contains spaces or escapes (such as 
 for the linefeed character), then it must be quoted.

       o   --rows=separator, -r separator

	   +--------------------+------------------+
	   |Command-Line Format | --rows=string    |
	   +--------------------+------------------+
	   |			| -r		   |
	   +--------------------+------------------+
	   |			| Permitted Values |
	   |			+---------+--------+
	   |			| Type	  | string |
	   |			+---------+--------+
	   |			| Default |	   |
	   +--------------------+---------+--------+
	   Specifies a separator string used to separate the rows in the result. The default is a space character.

	       Note
	       If the separator contains spaces or escapes (such as 
 for the linefeed character), then it must be quoted.

       o   --configinfo

	   The --configinfo option causes ndb_config to dump a list of each MySQL Cluster configuration parameter supported by the MySQL Cluster
	   distribution of which ndb_config is a part, including the following information:

	   o   A brief description of each parameter's purpose, effects, and usage

	   o   The section of the config.ini file where the parameter may be used

	   o   The parameter's data type or unit of measurement

	   o   Where applicable, the parameter's default, minimum, and maximum values

	   o   A brief description of the parameter's purpose, effects, and usage

	   o   MySQL Cluster release version and build information

	   By default, this output is in text format. Part of this output is shown here:

	       shell> ndb_config --configinfo
	       ****** SYSTEM ******
	       Name (String)
	       Name of system (NDB Cluster)
	       MANDATORY
	       PrimaryMGMNode (Non-negative Integer)
	       Node id of Primary ndb_mgmd(MGM) node
	       Default: 0 (Min: 0, Max: 4294967039)
	       ConfigGenerationNumber (Non-negative Integer)
	       Configuration generation number
	       Default: 0 (Min: 0, Max: 4294967039)
	       ****** DB ******
	       MaxNoOfSubscriptions (Non-negative Integer)
	       Max no of subscriptions (default 0 == MaxNoOfTables)
	       Default: 0 (Min: 0, Max: 4294967039)
	       MaxNoOfSubscribers (Non-negative Integer)
	       Max no of subscribers (default 0 == 2 * MaxNoOfTables)
	       Default: 0 (Min: 0, Max: 4294967039)
	       ...

	   --configinfo --xml

	   +--------------------+--------------------+
	   |Command-Line Format | --configinfo --xml |
	   +--------------------+--------------------+
	   |			| Permitted Values   |
	   |			+----------+---------+
	   |			| Type	   |boolean  |
	   |			+----------+---------+
	   |			| Default  |false    |
	   +--------------------+----------+---------+
	   You can obtain the output of ndb_config --configinfo as XML by adding the --xml option. A portion of the resulting output is shown in
	   this example:

	       shell> ndb_config --configinfo --xml
	       <configvariables protocolversion="1" ndbversionstring="5.5.35-ndb-7.2.15"
				   ndbversion="458758" ndbversionmajor="7" ndbversionminor="0"
				   ndbversionbuild="6">
		 <section name="SYSTEM">
		   <param name="Name" comment="Name of system (NDB Cluster)" type="string"
			     mandatory="true"/>
		   <param name="PrimaryMGMNode" comment="Node id of Primary ndb_mgmd(MGM) node"
			     type="unsigned" default="0" min="0" max="4294967039"/>
		   <param name="ConfigGenerationNumber" comment="Configuration generation number"
			     type="unsigned" default="0" min="0" max="4294967039"/>
		 </section>
		 <section name="NDBD">
		   <param name="MaxNoOfSubscriptions"
			     comment="Max no of subscriptions (default 0 == MaxNoOfTables)"
			     type="unsigned" default="0" min="0" max="4294967039"/>
		   <param name="MaxNoOfSubscribers"
			     comment="Max no of subscribers (default 0 == 2 * MaxNoOfTables)"
			     type="unsigned" default="0" min="0" max="4294967039"/>
		   ...
		 </section>
		 ...
	       </configvariables>

	       Note
	       Normally, the XML output produced by ndb_config --configinfo --xml is formatted using one line per element; we have added extra
	       whitespace in the previous example, as well as the next one, for reasons of legibility. This should not make any difference to
	       applications using this output, since most XML processors either ignore nonessential whitespace as a matter of course, or can be
	       instructed to do so.
	   The XML output also indicates when changing a given parameter requires that data nodes be restarted using the --initial option. This is
	   shown by the presence of an initial="true" attribute in the corresponding <param> element. In addition, the restart type (system or
	   node) is also shown; if a given parameter requires a system restart, this is indicated by the presence of a restart="system" attribute
	   in the corresponding <param> element. For example, changing the value set for the Diskless parameter requires a system initial restart,
	   as shown here (with the restart and initial attributes highlighted for visibility):

	       <param name="Diskless" comment="Run wo/ disk" type="bool" default="false"
			 restart="system" initial="true"/>

	   Currently, no initial attribute is included in the XML output for <param> elements corresponding to parameters which do not require
	   initial restarts; in other words, initial="false" is the default, and the value false should be assumed if the attribute is not
	   present. Similarly, the default restart type is node (that is, an online or "rolling" restart of the cluster), but the restart
	   attribute is included only if the restart type is system (meaning that all cluster nodes must be shut down at the same time, then
	   restarted).

	       Important
	       The --xml option can be used only with the --configinfo option. Using --xml without --configinfo fails with an error.
	   Unlike the options used with this program to obtain current configuration data, --configinfo and --xml use information obtained from
	   the MySQL Cluster sources when ndb_config was compiled. For this reason, no connection to a running MySQL Cluster or access to a
	   config.ini or my.cnf file is required for these two options.

	   Combining other ndb_config options (such as --query or --type) with --configinfo or --xml is not supported. Currently, if you attempt
	   to do so, the usual result is that all other options besides --configinfo or --xml are simply ignored.  However, this behavior is not
	   guaranteed and is subject to change at any time. In addition, since ndb_config, when used with the --configinfo option, does not access
	   the MySQL Cluster or read any files, trying to specify additional options such as --ndb-connectstring or --config-file with
	   --configinfo serves no purpose.
	       Examples

	1. To obtain the node ID and type of each node in the cluster:

	       shell> ./ndb_config --query=id,type --fields=':' --rows='
'
	       1:ndbd
	       2:ndbd
	       3:ndbd
	       4:ndbd
	       5:ndb_mgmd
	       6:mysqld
	       7:mysqld
	       8:mysqld
	       9:mysqld

	   In this example, we used the --fields options to separate the ID and type of each node with a colon character (:), and the --rows
	   options to place the values for each node on a new line in the output.

	2. To produce a connection string that can be used by data, SQL, and API nodes to connect to the management server:

	       shell> ./ndb_config --config-file=usr/local/mysql/cluster-data/config.ini 
	       --query=hostname,portnumber --fields=: --rows=, --type=ndb_mgmd
	       192.168.0.179:1186

	3. This invocation of ndb_config checks only data nodes (using the --type option), and shows the values for each node's ID and host name,
	   as well as the values set for its DataMemory, IndexMemory, and DataDir parameters:

	       shell> ./ndb_config --type=ndbd --query=id,host,datamemory,indexmemory,datadir -f ' : ' -r '
'
	       1 : 192.168.0.193 : 83886080 : 18874368 : /usr/local/mysql/cluster-data
	       2 : 192.168.0.112 : 83886080 : 18874368 : /usr/local/mysql/cluster-data
	       3 : 192.168.0.176 : 83886080 : 18874368 : /usr/local/mysql/cluster-data
	       4 : 192.168.0.119 : 83886080 : 18874368 : /usr/local/mysql/cluster-data

	   In this example, we used the short options -f and -r for setting the field delimiter and row separator, respectively.

	4. To exclude results from any host except one in particular, use the --host option:

	       shell> ./ndb_config --host=192.168.0.176 -f : -r '
' -q id,type
	       3:ndbd
	       5:ndb_mgmd

	   In this example, we also used the short form -q to determine the attributes to be queried.

	   Similarly, you can limit results to a node with a specific ID using the --id or --nodeid option.

COPYRIGHT

       Copyright (C) 1997, 2014, Oracle and/or its affiliates. All rights reserved.

       This documentation is free software; you can redistribute it and/or modify it only under the terms of the GNU General Public License as
       published by the Free Software Foundation; version 2 of the License.

       This documentation is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with the program; if not, write to the Free Software Foundation,
       Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or see http://www.gnu.org/licenses/.

SEE ALSO

       For more information, please refer to the MySQL Reference Manual, which may already be installed locally and which is also available online
       at http://dev.mysql.com/doc/.

AUTHOR

       Oracle Corporation (http://dev.mysql.com/).

MySQL 5.5							    01/30/2014							     NDB_CONFIG(1)