在本节中，我们将讨论通过创建和编辑配置文件来手动配置已安装的 NDB 集群。In this section, we discuss manual configuration of an installed NDB Cluster by creating and editing configuration files.

对于我们的四节点、四主机 NDB 集群（参见 集群节点和主机计算机），需要编写四个配置文件，每个节点主机一个。For our four-node, four-host NDB Cluster (see Cluster nodes and host computers), it is necessary to write four configuration files, one per node host.

配置数据节点和 SQL 节点。 数据节点所需的my.cnf文件相对简单。配置文件应位于/etc目录下，可以使用任何文本编辑器进行编辑。（如果文件不存在，请创建它。）例如：Configuring the data nodes and SQL nodes.  The my.cnf file needed for the data nodes is fairly simple. The configuration file should be located in the /etc directory and can be edited using any text editor. (Create the file if it does not exist.) For example:

$> vi /etc/my.cnf

对于我们示例设置中的每个数据节点和 SQL 节点，my.cnf应如下所示：For each data node and SQL node in our example setup, my.cnf should look like this:

[mysqld]
# Options for mysqld process:
ndbcluster                      # run NDB storage engine

[mysql_cluster]
# Options for NDB Cluster processes:
ndb-connectstring=198.51.100.10  # location of management server

输入上述信息后，保存此文件并退出文本编辑器。对托管数据节点“A”、数据节点“B”以及 SQL 节点的机器执行此操作。After entering the preceding information, save this file and exit the text editor. Do this for the machines hosting data node “A”, data node “B”, and the SQL node.

配置管理节点。 配置管理节点的第一步是创建存放配置文件的目录，然后创建配置文件本身。例如（以 root 运行）：Configuring the management node.  The first step in configuring the management node is to create the directory in which the configuration file can be found and then to create the file itself. For example (running as root):

$> mkdir /var/lib/mysql-cluster
$> cd /var/lib/mysql-cluster
$> vi config.ini

对于我们的示例设置，config.ini 文件应如下所示：For our representative setup, the config.ini file should read as follows:

[ndbd default]
# Options affecting ndbd processes on all data nodes:
NoOfReplicas=2    # Number of fragment replicas
DataMemory=98M    # How much memory to allocate for data storage

[ndb_mgmd]
# Management process options:
HostName=198.51.100.10          # Hostname or IP address of management node
DataDir=/var/lib/mysql-cluster  # Directory for management node log files

[ndbd]
# Options for data node "A":
                                # (one [ndbd] section per data node)
HostName=198.51.100.30          # Hostname or IP address
NodeId=2                        # Node ID for this data node
DataDir=/usr/local/mysql/data   # Directory for this data node's data files

[ndbd]
# Options for data node "B":
HostName=198.51.100.40          # Hostname or IP address
NodeId=3                        # Node ID for this data node
DataDir=/usr/local/mysql/data   # Directory for this data node's data files

[mysqld]
# SQL node options:
HostName=198.51.100.20          # Hostname or IP address
                                # (additional mysqld connections can be
                                # specified for this node for various
                                # purposes such as running ndb_restore)

在创建了所有配置文件并指定了这些最小选项之后，您就可以继续启动集群并验证所有进程是否正在运行。我们在第 25.3.4 节，“NDB 集群的初始启动”中讨论了具体操作方法。After all the configuration files have been created and these minimal options have been specified, you are ready to proceed with starting the cluster and verifying that all processes are running. We discuss how this is done in Section 25.3.4, “Initial Startup of NDB Cluster”.

有关可用 NDB 集群配置参数及其用途的更详细信息，请参见 第 25.4.3 节，“NDB 集群配置文件”，以及 第 25.4 节，“NDB 集群配置”。有关 NDB 集群备份相关的配置，请参见 第 25.6.8.3 节，“NDB 集群备份配置”。For more detailed information about the available NDB Cluster configuration parameters and their uses, see Section 25.4.3, “NDB Cluster Configuration Files”, and Section 25.4, “Configuration of NDB Cluster”. For configuration of NDB Cluster as relates to making backups, see Section 25.6.8.3, “Configuration for NDB Cluster Backups”.

集群管理节点的默认端口是 1186。对于数据节点，集群可以自动分配已空闲的端口。The default port for Cluster management nodes is 1186. For data nodes, the cluster can automatically allocate ports from those that are already free.