--character-sets-dir

包含字符集的目录。Directory containing character sets.

cluster-config-suffix

在读取 my.cnf 中的集群配置部分时覆盖默认的组后缀；用于测试。Override defaults group suffix when reading cluster configuration sections in my.cnf; used in testing.

--configinfo

--configinfo 选项会使 ndb_config 输出 NDB Cluster 分发版所支持的每个 NDB Cluster 配置参数的列表，ndb_config 就是该分发版的一部分，包括以下信息：The --configinfo option causes ndb_config to dump a list of each NDB Cluster configuration parameter supported by the NDB Cluster distribution of which ndb_config is a part, including the following information:

默认情况下，此输出为文本格式。此处显示了部分输出：By default, this output is in text format. Part of this output is shown here:

$> ndb_config --configinfo

****** SYSTEM ******

Name (String)
Name of system (NDB Cluster)
MANDATORY

PrimaryMGMNode (Non-negative Integer)
Node id of Primary ndb_mgmd(MGM) node
Default: 0 (Min: 0, Max: 4294967039)

ConfigGenerationNumber (Non-negative Integer)
Configuration generation number
Default: 0 (Min: 0, Max: 4294967039)

****** DB ******

MaxNoOfSubscriptions (Non-negative Integer)
Max no of subscriptions (default 0 == MaxNoOfTables)
Default: 0 (Min: 0, Max: 4294967039)

MaxNoOfSubscribers (Non-negative Integer)
Max no of subscribers (default 0 == 2 * MaxNoOfTables)
Default: 0 (Min: 0, Max: 4294967039)

…

将此选项与 --xml 选项一起使用，以获取 XML 格式的输出。Use this option together with the --xml option to obtain output in XML format.

--config-binary-file=path-to-file --config-binary-file=path-to-file

提供到管理服务器缓存的二进制配置文件的路径（ndb_nodeID_config.bin.seqno）。这可以是相对路径或绝对路径。如果管理服务器和使用的 ndb_config 二进制文件位于不同主机上，则必须使用绝对路径。Gives the path to the management server's cached binary configuration file (ndb_nodeID_config.bin.seqno). This may be a relative or absolute path. If the management server and the ndb_config binary used reside on different hosts, you must use an absolute path.

此示例演示了如何将 --config-binary-file 与其他 ndb_config 选项结合使用以获取有用的输出：This example demonstrates combining --config-binary-file with other ndb_config options to obtain useful output:

$> ndb_config --config-binary-file=../mysql-cluster/ndb_50_config.bin.1 --diff-default --type=ndbd
config of [DB] node id 5 that is different from default 
CONFIG_PARAMETER,ACTUAL_VALUE,DEFAULT_VALUE 
NodeId,5,(mandatory) 
BackupDataDir,/local/data/8.4,(null) 
DataDir,/local/data/8.4,. 
DataMemory,2G,98M 
FileSystemPath,/local/data/8.4,(null) 
HostName,127.0.0.1,localhost 
Nodegroup,0,(null) 
ThreadConfig,,(null) 

config of [DB] node id 6 that is different from default 
CONFIG_PARAMETER,ACTUAL_VALUE,DEFAULT_VALUE 
NodeId,6,(mandatory) 
BackupDataDir,/local/data/8.4,(null) 
DataDir,/local/data/8.4. 
DataMemory,2G,98M 
FileSystemPath,/local/data/8.4,(null) 
HostName,127.0.0.1,localhost 
Nodegroup,0,(null) 
ThreadConfig,,(null)

$> ndb_config --config-binary-file=../mysql-cluster/ndb_50_config.bin.1 --diff-default --system
config of [SYSTEM] system 
CONFIG_PARAMETER,ACTUAL_VALUE,DEFAULT_VALUE 
Name,MC_20220906060042,(mandatory) 
ConfigGenerationNumber,1,0 
PrimaryMGMNode,50,0

以下显示了 config.ini 文件的相关部分：The relevant portions of the config.ini file are shown here:

[ndbd default]
DataMemory= 2G
NoOfReplicas= 2

[ndb_mgmd]
NodeId= 50
HostName= 127.0.0.1

[ndbd]
NodeId= 5
HostName= 127.0.0.1
DataDir= /local/data/8.4

[ndbd]
NodeId= 6
HostName= 127.0.0.1
DataDir= /local/data/8.4

通过将输出与配置文件进行比较，可以看到文件中的所有设置都已由管理服务器写入二进制缓存，从而应用到集群中。By comparing the output with the configuration file, you can see that all of the settings in the file have been written by the management server to the binary cache, and thus, applied to the cluster.

--config-file=path-to-file --config-file=path-to-file

提供集群配置文件的路径（config.ini）。这可以是相对路径或绝对路径。如果管理服务器和使用的 ndb_config 二进制文件位于不同主机上，则必须使用绝对路径。Gives the path to the cluster configuration file (config.ini). This may be a relative or absolute path. If the management server and the ndb_config binary used reside on different hosts, you must use an absolute path.

--config_from_node=#

从具有该 ID 的数据节点获取集群的配置信息。Obtain the cluster's configuration data from the data node that has this ID.

如果具有此 ID 的节点不是数据节点，ndb_config 将报错。（如果想从管理节点获取配置数据，只需省略此选项。）If the node having this ID is not a data node, ndb_config fails with an error. (To obtain configuration data from the management node instead, simply omit this option.)

--connect-retries

放弃之前重试连接的次数。Number of times to retry connection before giving up.

--connect-retry-delay

尝试联系管理服务器之间等待的秒数。Number of seconds to wait between attempts to contact management server.

--connect-string

与 --ndb-connectstring 相同。Same as --ndb-connectstring.

--connections

告诉 ndb_config 仅打印 CONNECTIONS 信息——也就是关于在集群配置文件的 [tcp]、[tcp default]、[shm] 或 [shm default] 部分中找到的参数的信息（更多信息请参见 第 25.4.3.10 节，“NDB 集群 TCP/IP 连接” 和 第 25.4.3.12 节，“NDB 集群共享内存连接”）。Tells ndb_config to print CONNECTIONS information only—that is, information about parameters found in the [tcp], [tcp default], [shm], or [shm default] sections of the cluster configuration file (see Section 25.4.3.10, “NDB Cluster TCP/IP Connections”, and Section 25.4.3.12, “NDB Cluster Shared-Memory Connections”, for more information).

此选项与 --nodes 和 --system 互斥；这三者中只能使用其中一个选项。This option is mutually exclusive with --nodes and --system; only one of these 3 options can be used.

--core-file

错误时生成核心文件；用于调试。Write core file on error; used in debugging.

--defaults-extra-file

在读取全局文件之后读取给定文件。Read given file after global files are read.

--defaults-file

仅从指定文件读取默认选项。Read default options from given file only.

--defaults-group-suffix

也读取组合了 concat(group, suffix) 的组。Also read groups with concat(group, suffix).

--diff-default

仅打印具有非默认值的配置参数。Print only configuration parameters that have non-default values.

--fields=delimiter, -f delimiter

指定用于分隔结果中字段的delimiter字符串。默认值是,（逗号字符）。Specifies a delimiter string used to separate the fields in the result. The default is , (the comma character).

--help

显示帮助文本并退出。Display help text and exit.

--host=hostname --host=hostname

指定要获取配置信息的节点的主机名。Specifies the host name of the node for which configuration information is to be obtained.

--login-path

从登录文件读取给定路径。Read given path from login file.

--mycnf

从 my.cnf 文件读取配置数据。Read configuration data from the my.cnf file.

--ndb-connectstring=connection_string, -c connection_string

指定用于连接管理服务器的连接字符串。连接字符串的格式与第 25.4.3.3 节，“NDB 集群连接字符串”中描述的格式相同，默认值为localhost:1186。Specifies the connection string to use in connecting to the management server. The format for the connection string is the same as described in Section 25.4.3.3, “NDB Cluster Connection Strings”, and defaults to localhost:1186.

--ndb-mgm-tls

设置连接到管理服务器所需的 TLS 支持级别；可以是 relaxed 或 strict。relaxed（默认）表示尝试建立 TLS 连接，但不要求成功；strict表示连接必须使用 TLS。Sets the level of TLS support required to connect to the management server; one of relaxed or strict. relaxed (the default) means that a TLS connection is attempted, but success is not required; strict means that TLS is required to connect.

--ndb-mgmd-host

与 --ndb-connectstring 相同。Same as --ndb-connectstring.

--ndb-nodeid

为此节点设置节点 ID，覆盖由 --ndb-connectstring 设置的任何 ID。Set node ID for this node, overriding any ID set by --ndb-connectstring.

--ndb-optimized-node-selection

启用事务节点选择的优化。默认启用；使用 --skip-ndb-optimized-node-selection 来禁用。Enable optimizations for selection of nodes for transactions. Enabled by default; use --skip-ndb-optimized-node-selection to disable.

--ndb-tls-search-path

指定用于搜索 CA 文件的目录列表。在 Unix 平台上，目录名称用冒号 (:) 分隔；在 Windows 系统上，使用分号 (;) 作为分隔符。目录引用可以是相对路径或绝对路径；它可以包含一个或多个环境变量，每个变量以美元符号 ($) 开头，并在使用前进行展开。Specify a list of directories to search for a CA file. On Unix platforms, the directory names are separated by colons (:); on Windows systems, the semicolon character (;) is used as the separator. A directory reference may be relative or absolute; it may contain one or more environment variables, each denoted by a prefixed dollar sign ($), and expanded prior to use.

搜索从最左边的命名目录开始，按从左到右的顺序进行，直到找到文件。空字符串表示空搜索路径，这会导致所有搜索失败。由单个点 (.) 组成的字符串表示搜索路径仅限于当前工作目录。Searching begins with the leftmost named directory and proceeds from left to right until a file is found. An empty string denotes an empty search path, which causes all searches to fail. A string consisting of a single dot (.) indicates that the search path limited to the current working directory.

如果未提供搜索路径，则使用编译时的默认值。此值取决于所使用的平台：在 Windows 上，它是 \ndb-tls；在其他平台（包括 Linux）上，它是 $HOME/ndb-tls。可以通过使用 -DWITH_NDB_TLS_SEARCH_PATH 编译 NDB Cluster 来覆盖该值。If no search path is supplied, the compiled-in default value is used. This value depends on the platform used: On Windows, this is \ndb-tls; on other platforms (including Linux), it is $HOME/ndb-tls. This can be overridden by compiling NDB Cluster using -DWITH_NDB_TLS_SEARCH_PATH.

--no-defaults

除了登录文件之外，不从任何配置文件读取默认选项。Do not read default options from any option file other than login file.

--no-login-paths

跳过从登录路径文件读取选项。Skips reading options from the login path file.

--nodeid=node_id

指定要获取配置信息的节点的节点 ID。Specify the node ID of the node for which configuration information is to be obtained.

--nodes

告诉 ndb_config 打印仅与集群配置文件中的 [ndbd] 或 [ndbd default] 部分定义的参数相关的信息（参见 第 25.4.3.6 节，“定义 NDB 集群数据节点”）。Tells ndb_config to print information relating only to parameters defined in an [ndbd] or [ndbd default] section of the cluster configuration file (see Section 25.4.3.6, “Defining NDB Cluster Data Nodes”).

该选项与 --connections 和 --system 互斥；这三个选项中只能使用其中一个。This option is mutually exclusive with --connections and --system; only one of these 3 options can be used.

--print-defaults

打印程序参数列表然后退出。Print program argument list and exit.

--query=query-options, -q query-options --query=query-options, -q query-options

这是一个以逗号分隔的查询选项列表——也就是要返回的一个或多个节点属性的列表。这些包括nodeid（节点 ID）、type（节点类型——即ndbd、mysqld或ndb_mgmd）以及任何需要获取其值的配置参数。This is a comma-delimited list of query options—that is, a list of one or more node attributes to be returned. These include nodeid (node ID), type (node type—that is, ndbd, mysqld, or ndb_mgmd), and any configuration parameters whose values are to be obtained.

例如，--query=nodeid,type,datamemory,datadir为每个节点返回节点 ID、节点类型、DataMemory和DataDir。For example, --query=nodeid,type,datamemory,datadir returns the node ID, node type, DataMemory, and DataDir for each node.

--query-all, -a

返回所有查询选项（节点属性）的逗号分隔列表；注意，该列表是单个字符串。Returns a comma-delimited list of all query options (node attributes; note that this list is a single string.

--rows=separator, -r separator

指定用于分隔结果行的separator字符串。默认是空格字符。Specifies a separator string used to separate the rows in the result. The default is a space character.

--system

告诉ndb_config只打印SYSTEM信息。这包括运行时无法更改的系统变量，因此在集群配置文件中没有对应的部分。它们可以在ndb_config --configinfo的输出中看到（前缀为****** SYSTEM ******）。Tells ndb_config to print SYSTEM information only. This consists of system variables that cannot be changed at run time; thus, there is no corresponding section of the cluster configuration file for them. They can be seen (prefixed with ****** SYSTEM ******) in the output of ndb_config --configinfo.

此选项与 --nodes 和 --connections 互斥；这三个选项中只能使用一个。This option is mutually exclusive with --nodes and --connections; only one of these 3 options can be used.

--type=node_type

筛选结果，仅返回适用于指定 node_type （ndbd、mysqld 或 ndb_mgmd）节点的配置值。Filters results so that only configuration values applying to nodes of the specified node_type (ndbd, mysqld, or ndb_mgmd) are returned.

--usage，--help，或 -? --usage, --help, or -?

使 ndb_config 打印可用选项列表，然后退出。Causes ndb_config to print a list of available options, and then exit.

--version, -V

导致 ndb_config 打印版本信息字符串，然后退出。Causes ndb_config to print a version information string, and then exit.

--configinfo --xml

通过添加此选项，可以使 ndb_config --configinfo 以 XML 格式输出。此示例显示了部分输出：Cause ndb_config --configinfo to provide output as XML by adding this option. A portion of such output is shown in this example:

$> ndb_config --configinfo --xml

<configvariables protocolversion="1" ndbversionstring="5.7.44-ndb-7.5.36"
                    ndbversion="460032" ndbversionmajor="7" ndbversionminor="5"
                    ndbversionbuild="0">
  <section name="SYSTEM">
    <param name="Name" comment="Name of system (NDB Cluster)" type="string"
              mandatory="true"/>
    <param name="PrimaryMGMNode" comment="Node id of Primary ndb_mgmd(MGM) node"
              type="unsigned" default="0" min="0" max="4294967039"/>
    <param name="ConfigGenerationNumber" comment="Configuration generation number"
              type="unsigned" default="0" min="0" max="4294967039"/>
  </section>
  <section name="MYSQLD" primarykeys="NodeId">
    <param name="wan" comment="Use WAN TCP setting as default" type="bool"
              default="false"/>
    <param name="HostName" comment="Name of computer for this node"
              type="string" default=""/>
    <param name="Id" comment="NodeId" type="unsigned" mandatory="true"
              min="1" max="255" deprecated="true"/>
    <param name="NodeId" comment="Number identifying application node (mysqld(API))"
              type="unsigned" mandatory="true" min="1" max="255"/>
    <param name="ExecuteOnComputer" comment="HostName" type="string"
              deprecated="true"/>

    …

  </section>

  …

</configvariables>

XML 输出还会指示在更改给定参数时是否需要使用 --initial 选项重新启动数据节点。如在相应的 <param> 元素中存在 initial="true" 属性所示。此外，还会显示重启类型（system 或 node）；如果某个参数需要系统重启，则在相应的 <param> 元素中会显示 restart="system" 属性。例如，更改 Diskless 参数的值需要系统初始重启，如下所示（突出显示了 restart 和 initial 属性以便查看）：The XML output also indicates when changing a given parameter requires that data nodes be restarted using the --initial option. This is shown by the presence of an initial="true" attribute in the corresponding <param> element. In addition, the restart type (system or node) is also shown; if a given parameter requires a system restart, this is indicated by the presence of a restart="system" attribute in the corresponding <param> element. For example, changing the value set for the Diskless parameter requires a system initial restart, as shown here (with the restart and initial attributes highlighted for visibility):

<param name="Diskless" comment="Run wo/ disk" type="bool" default="false"
          restart="system" initial="true"/>

Currently, no initial attribute is included in the XML output for <param> elements corresponding to parameters which do not require initial restarts; in other words, initial="false" is the default, and the value false should be assumed if the attribute is not present. Similarly, the default restart type is node (that is, an online or “rolling” restart of the cluster), but the restart attribute is included only if the restart type is system (meaning that all cluster nodes must be shut down at the same time, then restarted).

弃用参数在 XML 输出中通过 deprecated 属性表示，如下所示：Deprecated parameters are indicated in the XML output by the deprecated attribute, as shown here:

<param name="NoOfDiskPagesToDiskAfterRestartACC" comment="DiskCheckpointSpeed"
       type="unsigned" default="20" min="1" max="4294967039" deprecated="true"/>

在这种情况下，comment 指的是一个或多个取代已弃用参数的参数。与 initial 类似，deprecated 属性仅在参数被弃用时显示，即 deprecated="true"，对于未弃用的参数则根本不会出现该属性。（Bug #21127135）In such cases, the comment refers to one or more parameters that supersede the deprecated parameter. Similarly to initial, the deprecated attribute is indicated only when the parameter is deprecated, with deprecated="true", and does not appear at all for parameters which are not deprecated. (Bug #21127135)

必须的参数用 mandatory="true" 表示，如下所示：Parameters that are required are indicated with mandatory="true", as shown here:

<param name="NodeId"
          comment="Number identifying application node (mysqld(API))"
          type="unsigned" mandatory="true" min="1" max="255"/>

就像 initial 或 deprecated 属性仅显示在需要初始重启或已弃用的参数上一样，mandatory 属性仅在给定参数确实是必需时才包含。In much the same way that the initial or deprecated attribute is displayed only for a parameter that requires an initial restart or that is deprecated, the mandatory attribute is included only if the given parameter is actually required.

与用于获取当前配置数据的该程序的其他选项不同，--configinfo 和 --xml 使用在编译 ndb_config 时从 NDB Cluster 来源获取的信息。因此，这两个选项不需要连接到正在运行的 NDB Cluster，也不需要访问 config.ini 或 my.cnf 文件。Unlike the options used with this program to obtain current configuration data, --configinfo and --xml use information obtained from the NDB Cluster sources when ndb_config was compiled. For this reason, no connection to a running NDB Cluster or access to a config.ini or my.cnf file is required for these two options.