To shut down the cluster, enter the following command in a shell on the machine hosting the management node:
ndb_mgm -e shutdown
-e option here is used to pass a command to
the ndb_mgm client from the shell. (See
Section 17.4.20, “Options Common to MySQL Cluster Programs — 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
ndb_mgmd -f /var/lib/mysql-cluster/config.ini
On each of the data node hosts
Use the ndb_mgm client to verify that both data nodes have started successfully.
On the SQL host (
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 17.5.5, “Performing a Rolling Restart of a MySQL Cluster”.