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17.2.6 Upgrading and Downgrading MySQL Cluster »
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17.2.5. Safe Shutdown and Restart of MySQL Cluster

To shut down the cluster, enter the following command in a shell on the machine hosting the management node: 

shell> ndb_mgm -e shutdown

The -e option here is used to pass a command to the ndb_mgm client from the shell. (See Section 17.4.23, “Options Common to MySQL Cluster Programs”, for more information about this option.) The command causes the ndb_mgm, ndb_mgmd, and any ndbd processes to terminate gracefully. Any SQL nodes can be terminated using mysqladmin shutdown and other means.

To restart the cluster, run these commands:

  • On the management host (192.168.0.10 in our example setup): 

    shell> ndb_mgmd -f /var/lib/mysql-cluster/config.ini

  • On each of the data node hosts (192.168.0.30 and 192.168.0.40): 

    shell> ndbd

  • On the SQL host (192.168.0.20): 

    shell> mysqld_safe &

In a production setting, it is usually not desirable to shut down the cluster completely. In many cases, even when making configuration changes, or performing upgrades to the cluster hardware or software (or both), which require shutting down individual host machines, it is possible to do so without shutting down the cluster as a whole by performing a rolling restart of the cluster. For more information about doing this, see Section 17.2.6.1, “Performing a Rolling Restart of a MySQL Cluster”.