MySQL Cluster Manager 8.0.31 用户手册 / 第 5 章 MySQL Cluster Manager 客户端命令 /
4.1 在线帮助和信息命令
MySQL Cluster Manager 客户端中的联机帮助可用于 MySQL Cluster Manager 客户端命令。客户端可以提供一般信息和特定于命令的信息。此外，您可以获得有关 独立于 MySQL 服务器的mysql客户端命令的信息，因此在连接到 MySQL Cluster Manager 代理时也可以使用。
列出 MySQL Cluster Manager 客户端命令。
要获得包含简要说明的所有命令的列表，请使用
list commands命令，如下所示：
mcm> list commands;
+---------------------------------------------------------------------------+
| Help |
+---------------------------------------------------------------------------+
| COMMANDS |
| |
| abort backup Abort an ongoing cluster backup. |
| add hosts Add hosts to site. |
| add package Add a package alias. |
| add process Add cluster process. |
| autotune Autotune a cluster to given use-case template. |
| backup agents Backup the agents repository and metadata. |
| backup cluster Backup a cluster. |
| change log-level Change the log-level |
| change process Change process type. |
| collect logs Collect log files. |
| create cluster Create a cluster. |
| create site Create a site. |
| delete cluster Delete a cluster. |
| delete package Delete a package. |
| delete site Delete a site. |
| get Get configuration variables. |
| import cluster Import a running cluster. |
| import config Import the configuration of a running cluster. |
| list backups List backup images. |
| list clusters List all clusters. |
| list commands List the help text. |
| list hosts List hosts in site. |
| list nextnodeids List next nodeids to be allocated. |
| list packages List all packages. |
| list processes List processes. |
| list sites List all sites. |
| remove hosts Remove hosts from site. |
| remove process Remove a cluster process. |
| reset Reset configuration variables. |
| restart cluster Restart a cluster. |
| restore cluster Restore a cluster. |
| rotate log Rotate the mcmd log. |
| set Set configuration variables. |
| show settings Show agent settings. |
| show status Show cluster, process, operation or backup status. |
| start cluster Start a cluster. |
| start process Start a cluster process. |
| stop agents Stop agents in site. |
| stop cluster Stop a cluster. |
| stop process Stop a cluster process. |
| upgrade cluster Upgrade a cluster. |
| version Print version information. |
| |
| GLOBAL OPTIONS |
| Options that can be used with all commands |
| |
| --help|-? Print detailed help. |
| |
| Use '<COMMAND> --help' to see verbose help for individual commands. |
+---------------------------------------------------------------------------+
51 rows in set (0.03 sec)获取有关特定 MySQL Cluster Manager 客户端命令的信息。
要获取特定于给定命令的更详细帮助，请使用该选项调用该命令
--help，如本例所示：
mcm> create site --help;
+----------------------------------------------------------------+
| Help |
+----------------------------------------------------------------+
| |
| create site [options] <sitename> |
| |
| Creates a site from the hosts listed in --hosts. |
| |
| Required options: |
| --hosts|-h Comma separated list of hostnames. |
| Format: --hosts = <host>[,<host>]*. |
| |
+----------------------------------------------------------------+
9 rows in set (0.00 sec)
对于任何 MySQL Cluster Manager 客户端命令，该
--help选项可以缩写为
-?：
mcm> list processes -?;
+-------------------------------------------------------------+
| Help |
+-------------------------------------------------------------+
| |
| list processes <sitename> |
| |
| Lists all processes defined in the specified cluster. |
+-------------------------------------------------------------+
4 rows in set (0.00 sec)
正如本手册其他地方提到的（参见
第 4 章，MySQL Cluster Manager 客户端命令），许多其他 MySQL Cluster Manager 命令选项也有缩写形式。这些都包含在每个命令的文档中。--help您还可以通过使用或
-?选项
调用它来找出给定命令的这些内容
。
您可以从命令的输出中获取正在使用的MySQL Cluster Manager软件的发布版本version
。
MySQL Cluster Manager 客户端中的mysql客户端命令。
您还可以在 MySQL Cluster Manager 客户端中使用大多数标准的MySQL客户端命令（但不是SQL 语句，这取决于连接到 MySQL 服务器），例如prompt、quit和
status。例如，当连接到 MySQL Cluster Manager 代理时，状态命令的输出看起来像这样（取决于您使用的客户端和代理的确切版本以及可能的其他因素）：
mcm> status
--------------
/home/jon/bin/mcm/libexec/../cluster/bin/mysql
Ver 14.14 Distrib 5.7.29-ndb-7.6.13, for linux2.6 (x86_64) using EditLine wrapper
Connection id: 1
Current database: <n/a>
Current user: admin
SSL: Not in use
Current pager: less
Using outfile: ''
Using delimiter: ;
Server version: 1.4.8 MySQL Cluster Manager
Protocol version: 10
Connection: 127.0.0.1 via TCP/IP
Server characterset: <n/a>
Db characterset: <n/a>
Client characterset: <n/a>
Conn. characterset: <n/a>
TCP port: 1862
--------------
笔记
您可以将命令分隔符与mysql
客户端命令一起使用，但您不是必须这样做。例如，假设使用的分隔符是默认的分号 ( ;) 字符，我们可以status像这样执行命令：
mcm> status;
--------------
/home/jon/bin/mcm/cluster/bin/mysql Ver 14.14 Distrib 5.7.29-ndb-7.6.13,...您还可以与mcm一起使用
的一个特别有用的mysql客户端命令是
command（缩写形式
：） ，您可以使用它来执行包含 MySQL Cluster Manager 客户端命令的脚本。在 Linux 系统上，您的主目录中可能有一个名为 的文本文件
，其内容如下所示：
source\.get-attributes.mcm
get :ndb_mgmd mycluster\G
get :ndbd mycluster\G
get :mysqld mycluster\G
假设你已经创建了一个名为 的集群
mycluster，你可以在客户端运行这个脚本；结果根据该集群的实际配置方式而有所不同，但应该与此类似：
mcm> \. ~/get-attributes.mcm
mcm> get :ndb_mgmd mycluster\G
*************************** 1. row ***************************
Name: DataDir
Value: /home/jon/bin/mcm/mcm_data/clusters/mycluster/49/data
Process1: ndb_mgmd
NodeId1: 49
Process2:
NodeId2:
Level:
Comment:
*************************** 2. row ***************************
Name: HostName
Value: flundra
Process1: ndb_mgmd
NodeId1: 49
Process2:
NodeId2:
Level:
Comment: Read only
*************************** 3. row ***************************
Name: NodeId
Value: 49
Process1: ndb_mgmd
NodeId1: 49
Process2:
NodeId2:
Level:
Comment: Read only
*************************** 4. row ***************************
Name: PortNumber
Value: 1186
Process1: ndb_mgmd
NodeId1: 49
Process2:
NodeId2:
Level: Process
Comment:
4 rows in set (0.09 sec)
mcm> get :ndbd mycluster\G
*************************** 1. row ***************************
Name: DataDir
Value: /home/jon/bin/mcm/mcm_data/clusters/mycluster/1/data
Process1: ndbd
NodeId1: 1
Process2:
NodeId2:
Level:
Comment:
*************************** 2. row ***************************
Name: HostName
Value: tonfisk
Process1: ndbd
NodeId1: 1
Process2:
NodeId2:
Level:
Comment: Read only
*************************** 3. row ***************************
Name: NodeId
Value: 1
Process1: ndbd
NodeId1: 1
Process2:
NodeId2:
Level:
Comment: Read only
*************************** 4. row ***************************
Name: DataDir
Value: /home/jon/bin/mcm/mcm_data/clusters/mycluster/2/data
Process1: ndbd
NodeId1: 2
Process2:
NodeId2:
Level:
Comment:
*************************** 5. row ***************************
Name: HostName
Value: grindval
Process1: ndbd
NodeId1: 2
Process2:
NodeId2:
Level:
Comment: Read only
*************************** 6. row ***************************
Name: NodeId
Value: 2
Process1: ndbd
NodeId1: 2
Process2:
NodeId2:
Level:
Comment: Read only
6 rows in set (0.10 sec)
mcm> get :mysqld mycluster\G
*************************** 1. row ***************************
Name: datadir
Value: /home/jon/bin/mcm/mcm_data/clusters/mycluster/50/data
Process1: mysqld
NodeId1: 50
Process2:
NodeId2:
Level:
Comment:
*************************** 2. row ***************************
Name: HostName
Value: haj
Process1: mysqld
NodeId1: 50
Process2:
NodeId2:
Level:
Comment: Read only
*************************** 3. row ***************************
Name: log_error
Value: /home/jon/bin/mcm/mcm_data/clusters/mycluster/50/data/mysqld_50_out.err
Process1: mysqld
NodeId1: 50
Process2:
NodeId2:
Level:
Comment:
*************************** 4. row ***************************
Name: ndb_nodeid
Value: 50
Process1: mysqld
NodeId1: 50
Process2:
NodeId2:
Level:
Comment: Read only
*************************** 5. row ***************************
Name: ndbcluster
Value:
Process1: mysqld
NodeId1: 50
Process2:
NodeId2:
Level:
Comment: Read only
*************************** 6. row ***************************
Name: NodeId
Value: 50
Process1: mysqld
NodeId1: 50
Process2:
NodeId2:
Level:
Comment: Read only
*************************** 7. row ***************************
Name: port
Value: 3306
Process1: mysqld
NodeId1: 50
Process2:
NodeId2:
Level:
Comment:
*************************** 8. row ***************************
Name: socket
Value: /tmp/mysql.mycluster.50.sock
Process1: mysqld
NodeId1: 50
Process2:
NodeId2:
Level:
Comment:
*************************** 9. row ***************************
Name: tmpdir
Value: /home/jon/bin/mcm/mcm_data/clusters/mycluster/50/data/tmp
Process1: mysqld
NodeId1: 50
Process2:
NodeId2:
Level:
Comment:
*************************** 10. row ***************************
Name: datadir
Value: /home/jon/bin/mcm/mcm_data/clusters/mycluster/51/data
Process1: mysqld
NodeId1: 51
Process2:
NodeId2:
Level:
Comment:
*************************** 11. row ***************************
Name: HostName
Value: torsk
Process1: mysqld
NodeId1: 51
Process2:
NodeId2:
Level:
Comment: Read only
*************************** 12. row ***************************
Name: log_error
Value: /home/jon/bin/mcm/mcm_data/clusters/mycluster/51/data/mysqld_51_out.err
Process1: mysqld
NodeId1: 51
Process2:
NodeId2:
Level:
Comment:
*************************** 13. row ***************************
Name: ndb_nodeid
Value: 51
Process1: mysqld
NodeId1: 51
Process2:
NodeId2:
Level:
Comment: Read only
*************************** 14. row ***************************
Name: ndbcluster
Value:
Process1: mysqld
NodeId1: 51
Process2:
NodeId2:
Level:
Comment: Read only
*************************** 15. row ***************************
Name: NodeId
Value: 51
Process1: mysqld
NodeId1: 51
Process2:
NodeId2:
Level:
Comment: Read only
*************************** 16. row ***************************
Name: port
Value: 3307
Process1: mysqld
NodeId1: 51
Process2:
NodeId2:
Level:
Comment:
*************************** 17. row ***************************
Name: socket
Value: /tmp/mysql.mycluster.51.sock
Process1: mysqld
NodeId1: 51
Process2:
NodeId2:
Level:
Comment:
*************************** 18. row ***************************
Name: tmpdir
Value: /home/jon/bin/mcm/mcm_data/clusters/mycluster/51/data/tmp
Process1: mysqld
NodeId1: 51
Process2:
NodeId2:
Level:
Comment:
18 rows in set (0.05 sec)
mcm>
笔记
在脚本执行完毕之前，您不会返回到客户端提示符。
同样，在 Windows 上，您可以使用记事本或其他文本编辑器创建批处理文件，将
get前面显示的相同命令复制到其中，并将其保存get-attributes.bat在方便的位置，例如 Windows 桌面。
您可以使用命令查看可用的mysql客户端命令列表help。有关这些的更多信息，请查看help输出或参阅MySQL 手册中的mysql 客户端命令。