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4.5. ndb_mgm — The MySQL Cluster Management Client

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: 

shell> ndb_mgm [host_name [port_num]]

For example: 

shell> ndb_mgm ndb_mgmd.mysql.com 1186

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

The following table includes options that are specific to the MySQL Cluster management client program ndb_mgm. Additional descriptions follow the table. For options common to all MySQL Cluster programs, see Section 4.23, “Options Common to MySQL Cluster Programs”.

Table 4.3. ndb_mgm Command Line Options

Format Description Introduction Deprecated Removed
--try-reconnect=# Specify number of tries for connecting to ndb_mgmd (0 = infinite)      

  • --try-reconnect=number

    Command-Line Format --try-reconnect=#
      Permitted Values
    Type boolean
    Default TRUE

    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.

Additional information about using ndb_mgm can be found in Section 5.2, “Commands in the MySQL Cluster Management Client”.