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 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 17.4.23, “Options Common to MySQL Cluster Programs”.
Table 17.11. ndb_mgm Command Line Options
|--try-reconnect=#||Specify number of tries for connecting to ndb_mgmd (0 = infinite)|
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 17.5.2, “Commands in the MySQL Cluster Management Client”.