Mysql – Setting up MySQL Cluster on Two Systems

clusteringMySQLmysql-5mysql-5.5

I am attempting to setup a MySQL Cluster.

I have the folllowing setup

  • one management node
  • two data nodes
  • another machine on which two more nodes reside

Below is the config.ini file:

[ndbd default]

# Options affecting ndbd processes on all data nodes:
NoOfReplicas=2    # Number of replicas

DataMemory=80M    # How much memory to allocate for data storage

IndexMemory=18M   # How much memory to allocate for index storage

                  # For DataMemory and IndexMemory, we have used the
                  # default values. Since the "world" database takes up
                  # only about 500KB, this should be more than enough for
                  # this example Cluster setup.

DataDir=/var/lib/mysql-cluster

[MYSQLD DEFAULT]

[NDB_MGMD DEFAULT]

LogDestination=FILE:filename=my-cluster.log


[tcp default]

[ndb_mgmd]

# Management process options:
hostname=X.X.X.26         # Hostname or IP address of MGM node

datadir=/var/lib/mysql-cluster  # Directory for MGM node log files

# Storage Nodes
[NDBD]

hostname=X.X.X.26   # IP address of storage-node-1

DataDir= /var/lib/mysql-cluster

[NDBD]

HostName=X.X.X.73         # IP address of storage-node-2

DataDir= /var/lib/mysql-cluster

[NDBD]
hostname=X.X.X.26      # IP address of storage-node-3
DataDir= /var/lib/mysql-cluster

[NDBD]
HostName=X.X.X.73         # IP address of storage-node-4
DataDir= /var/lib/mysql-cluster

# Setup node IDs for mySQL API-servers (clients of the cluster)

[mysqld]
# SQL node options:
hostname=X.X.X.73        # Hostname or IP address
                                # (additional mysqld connections can be
                                # specified for this node for various
                                # purposes such as running ndb_restore)

Below is the my.cnf file for both systems:

[mysqld]

ndbcluster # run NDB storage engine

ndb-connectstring=X.X.X.26 # location of management server

[mysql_cluster]

ndb-connectstring=X.X.X.26 # location of management server

When I try to start the cluster, it gives me following error:

Could not determine which NodeID to use for this node. Specify it with --ndb-nodeid=<nodeid> on command line

If clustering setup is done, there is no replication of data as it give me again another error: ERROR 1296 (HY000): Got error 4009 'Cluster Failure' from NDBCLUSTER

Can anyone help me determine the problem?

Best Answer

Your management configuration seems fine to me. It sounds like ndb_mgmd didn't quite die or there is a problem with the contents in the /var/lib/mysql-cluster directory on the management server.

You might also want to make sure that ndb_mgmd isn't starting automatically, like through some startup script in /etc/init.d/.

To try and resolve the issue, I'd start with these steps first.

Since you are just getting started and don't have any real data yet.

  1. Kill any left over ndb_mgmd processes with: killall ndb_mgmd or by rebooting if killall doesn't help.
  2. Completely delete everything within /var/lib/mysql-cluster: rm -Rf /var/lib/mysql-cluster/*
  3. Start the cluster process again: ndb_mgmd -f /etc/config.ini --initial

  4. Verify that ndb_mgmd is listening with netstat

    $> netstat -tlpn

    Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
    tcp 0 0 0.0.0.0:1186 0.0.0.0:* LISTEN 3251/ndb_mgmd

Connect to management node

$> ndb_mgm
ndb_mgm> show
Connected to Management Server at: localhost:1186
Cluster Configuration


[ndb_mgmd(MGM)] 1 node(s)
id=1    @192.168.9.26  (mysql-5.1.61 ndb-7.1.22)

Update

Here is a Quick Start guide from Oracle with all nodes, management, mysql and data running on one server.

http://downloads.mysql.com/tutorials/cluster/GetMySQLClusterRunning-LINUX.pdf

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