4.4.2 The delete cluster Command

delete cluster [--removedirs] cluster_name

This command deletes the cluster named cluster_name, removing it from the list of clusters managed by MySQL Cluster Manager.

delete cluster does not remove any MySQL NDB Cluster binaries from hosts. However, it does remove the cluster configuration, data, and log files that reside in the MySQL Cluster Manager data repository.

This example demonstrates how to delete a cluster named mycluster:

mcm> delete cluster mycluster;
+------------------------------+
| Command result               |
+------------------------------+
| Cluster deleted successfully |
+------------------------------+
1 row in set (1.22 sec)

A look at the MySQL Cluster Manager data repository (at /opt/mcm_data/ in this case) shows that the folder that used to host the configuration, data, and log files for mycluster (/opt/mcm_data/clusters/mycluster) no longer exists:

$> ls -l /opt/mcm_data/clusters
total 0

To remove the configuration and data files outside of the MySQL Cluster Manager data repository, delete cluster must be invoked with the --removedirs option, like this:

mcm> delete cluster --removedirs mycluster;
+------------------------------+
| Command result               |
+------------------------------+
| Cluster deleted successfully |
+------------------------------+
1 row in set (1.22 sec)

For example, if one of the data node on mycluster has its data directory outside of the MySQL Cluster Manager data repository:

mcm> get Datadir mycluster;
+---------+---------------------------+----------+---------+----------+---------+---------+---------+
| Name    | Value                     | Process1 | NodeId1 | Process2 | NodeId2 | Level   | Comment |
+---------+---------------------------+----------+---------+----------+---------+---------+---------+
| DataDir | /home/dso/mycluster/cdata | ndbd     | 1       |          |         | Process |         |
...

Deleting mycluster without using --removedirs does not remove the data directory for node 1:

$> ls -l /home/dso/mycluster
total 4 drwxr-xr-x. 3 dso dso 4096 Sep 10 18:00 cdata

However, if the --removedirs option is used, the data directory for node 1 also gets removed:

$> ls -l /home/dso/mycluster
total 0

delete cluster fails if the cluster to be deleted is running, as shown here:

mcm> delete cluster mycluster;
ERROR 5010 (00MGR): All processes must be stopped to delete cluster mycluster

You must shut down the cluster first, using stop cluster.