How To Set Up A Load-Balanced MySQL Cluster - Page 4

5 How To Restart The Cluster

Now let's asume you want to restart the MySQL cluster, for example because you have changed /var/lib/mysql-cluster/config.ini on loadb1.example.com or for some other reason. To do this, you use the ndb_mgm cluster management client on loadb1.example.com:

loadb1.example.com:

ndb_mgm

On the ndb_mgm console, you type

shutdown;

You will then see something like this:

ndb_mgm> shutdown;
Node 3: Cluster shutdown initiated
Node 2: Node shutdown completed.
2 NDB Cluster node(s) have shutdown.
NDB Cluster management server shutdown.
ndb_mgm>

This means that the cluster nodes sql1.example.com and sql2.example.com and also the cluster management server have shut down.

Run

quit;

to leave the ndb_mgm console.

To start the cluster management server, do this on loadb1.example.com:

loadb1.example.com:

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

and on sql1.example.com and sql2.example.com you run

sql1.example.com / sql2.example.com:

ndbd

or, if you have changed /var/lib/mysql-cluster/config.ini on loadb1.example.com:

ndbd --initial

Afterwards, you can check on loadb1.example.com if the cluster has restarted:

loadb1.example.com:

ndb_mgm

On the ndb_mgm console, type

show;

to see the current status of the cluster. It might take a few seconds after a restart until all nodes are reported as connected.

Type

quit;

to leave the ndb_mgm console.

Falko Timme

About Falko Timme

Falko Timme is an experienced Linux administrator and founder of Timme Hosting, a leading nginx business hosting company in Germany. He is one of the most active authors on HowtoForge since 2005 and one of the core developers of ISPConfig since 2000. He has also contributed to the O'Reilly book "Linux System Administration".

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By: Falko Timme