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MySQL 5.1 Reference Manual :: 15 MySQL Cluster :: 15.9 Cluster Utility Programs :: 15.9.1 ndb_config — Extract NDB Configuration Information
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15.9.1. ndb_config — Extract NDB Configuration Information

This tool extracts configuration information for data nodes, SQL nodes, and API nodes from a cluster management node (and possibly its config.ini file).

Usage: 

ndb_config options

The options available for this utility differ somewhat from those used with the other utilities, and so are listed in their entirety in the next section, followed by some examples.

Options:

  • --usage, --help, or -?

    Causes ndb_config to print a list of available options, and then exit.

  • --version, -V

    Causes ndb_config to print a version information string, and then exit.

  • --ndb-connectstring=connect_string

    Specifies the connectstring to use in connecting to the management server. The format for the connectstring is the same as described in Section 15.4.4.2, “The Cluster Connectstring”, and defaults to localhost:1186.

    The use of -c as a short version for this option is supported for ndb_config beginning with MySQL 5.1.12.

  • --config-file=path-to-file

    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.

  • --query=query-options, -q query-options

    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 would return 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.

  • --host=hostname

    Specifies the hostname of the node for which configuration information is to be obtained.

  • --id=node_id, --nodeid=node_id

    Used to specify the node ID of the node for which configuration information is to be obtained.

  • --nodes

    (Tells ndb_config to print information from parameters defined in [ndbd] sections only. Currently, using this option has no affect, since these are the only values checked, but it may become possible in future to query parameters set in [tcp] and other sections of cluster configuration files.)

  • --type=node_type

    Filters results so that only configuration values applying to nodes of the specified node_type (ndbd, mysqld, or ndb_mgmd) are returned.

  • --fields=delimiter, -f delimiter

    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 \n for the linefeed character), then it must be quoted.

  • --rows=separator, -r separator

    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 \n for the linefeed character), then it must be quoted.

Examples:

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

    shell> ./ndb_config --query=id,type --fields=':' --rows='\n'
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 connectstring 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 hostname, and its DataMemory, IndexMemory, and DataDir parameters: 

    shell> ./ndb_config --type=ndbd --query=id,host,datamemory,indexmemory,datadir -f ' : ' -r '\n'
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 '\n' -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.