一个myaql服务器运行多个数据库实例[转载]
2007-04-28    yejr   
打印自: 安恒公司
地址: HTTP://linux.anheng.com.cn/news/article.php?articleid=1212
一个myaql服务器运行多个数据库实例[转载]

[MySQL 5.1 体验]MySQL 实例管理器 mysqlmanager 初试

imysql.cn 2007年06月20日08:23 作者:yejr 

MySQL实例管理器(IM)是通过TCP/IP端口运行的后台程序，用来监视和管理MySQL数据库服务器实例。MySQL实例管理器适合Unix-类操作系统和Windows。

可以在mysqld_safe脚本使用MySQL实例管理器来启动和停止MySQL服务器，甚至可以从一个远程主机。MySQL实例管理器还执行mysqld_multi脚本的功能(和大多数语法)。

一、 mysqlmanager 配置文件
一个最常见的 mysqlmanager 配置文件如下：

[manager]
port	= 1999
socket	= /tmp/manager.sock
pid-file= /tmp/manager.pid
run-as-service	= true
monitoring-interval	= 10
default-mysqld-path	= /usr/local/mysql/bin/mysqld
password-file = /etc/mysqlmanager.passwd
log	=	/usr/local/mysql/bin/mysqld/mysqlmanager.log

[mysqld1]
basedir = /usr/local/mysql
datadir = /usr/local/mysql/data1
general-log	= true
log-error	= /usr/local/mysql/data1/error.log
pid-file	= /usr/local/mysql/data1/mysql.pid
port      = 13306
socket		= /tmp/mysql13306.sock

[mysqld2]
basedir = /usr/local/mysql
datadir = /usr/local/mysql/data2
general-log	= true
log-error	= /usr/local/mysql/data2/error.log
pid-file	= /usr/local/mysql/data2/mysql.pid
port      = 13307
socket		= /tmp/mysql13307.sock

[mysqld3]
basedir = /usr/local/mysql
datadir = /usr/local/mysql/data3
general-log	= true
log-error	= /usr/local/mysql/data3/error.log
pid-file	= /usr/local/mysql/data3/mysql.pid
port      = 13308
socket		= /tmp/mysql13308.sock

首先，第一个区间是 [manager]，它用于指定 mysqlmanager 程序启动时的选项。其中 run-as-service 选项是指 mysqlmanager 以后台守护进程方式运行， default-mysqld-path 选项则指定了 mysqld 程序所在的位置。 password-file 选项则指定了连接到 mysqlmanager 的用户密码文件所在位置。

接下来，后面的 [mysqld1], [mysqld2], [mysqld3] 区间则分别设定了3个 MySQL 运行实例。这些参数就是常见的设置了，在这里不再细说。

二、 mysqlmanager 用户管理
1、添加用户

[root@localhost]# /usr/local/mysql/bin/mysqlmanager --add-user --username=yejr
[20910/136318976] [07/06/19 11:03:01] [INFO] IM: started.
[20910/136318976] [07/06/19 11:03:01] [INFO] Loading config file 'my.cnf'...
[20910/136318976] [07/06/19 11:03:01] [INFO] Loading the password database...
[20910/136318976] [07/06/19 11:03:01] [INFO] The password database loaded successfully.
Enter password:
Re-type password:
[20910/136318976] [07/06/19 11:03:04] [INFO] IM: finished.
[root@localhost]# 
[root@localhost]# cat /etc/mysqlmanager.passwd
yejr:*0E558D9FBD602CDA0C9F3F7A8BC5F4F53401CD7C

2、修改密码

[root@localhost]# /usr/local/mysql/bin/mysqlmanager --edit-user --username=yejr
[20943/136318976] [07/06/19 11:05:01] [INFO] IM: started.
[20943/136318976] [07/06/19 11:05:01] [INFO] Loading config file 'my.cnf'...
[20943/136318976] [07/06/19 11:05:01] [INFO] Loading the password database...
[20943/136318976] [07/06/19 11:05:01] [INFO] Loaded user 'yejr'.
[20943/136318976] [07/06/19 11:05:01] [INFO] The password database loaded successfully.
Enter password:
Re-type password:
[20943/136318976] [07/06/19 11:05:05] [INFO] IM: finished.
[root@localhost]# 
[root@localhost]# cat /etc/mysqlmanager.passwd
yejr:*9DB91006131E32B22135599033C6A9C196EC3C6B

3、删除用户

[root@localhost]# /usr/local/mysql/bin/mysqlmanager --drop-user --username=yejr
[20967/136318976] [07/06/19 11:06:30] [INFO] IM: started.
[20967/136318976] [07/06/19 11:06:30] [INFO] Loading config file 'my.cnf'...
[20967/136318976] [07/06/19 11:06:30] [INFO] Loading the password database...
[20967/136318976] [07/06/19 11:06:30] [INFO] Loaded user 'yejr'.
[20967/136318976] [07/06/19 11:06:30] [INFO] The password database loaded successfully.
[20967/136318976] [07/06/19 11:06:30] [INFO] IM: finished.

默认情况下，mysqlmanager 的密码文件是 /etc/mysqlmanager.passwd，如果你的密码文件不是放在这里，那么就需要自行指定，增加一个参数 --password-file=path_to_passwd_file，让 mysqlmanager 根据指定的位置去找到正确的密码文件。如：

[root@localhost]# /usr/local/mysql/bin/mysqlmanager --password-file=/usr/local/mysql/.mysqlmanager.passwd --add-user --username=yejr

注意：修改或者删除用户后，只有重启 mysqlmanager 才能生效，而不是立刻生效。

三、 mysqlmanager 管理
1、mysqlmanager 启动

[root@localhost]# /usr/local/mysql/bin/mysqlmanager --defaults-file=/usr/local/mysql/my.cnf
[21032/136318976] [07/06/19 11:11:03] [INFO] IM: started.
[21032/136318976] [07/06/19 11:11:03] [INFO] Loading config file '/usr/local/mysql/my.cnf'...
[21032/136318976] [07/06/19 11:11:03] [INFO] Angel: started.
[21032/136318976] [07/06/19 11:11:03] [INFO] Angel: opening log file '/usr/local/mysql/bin/mysqld/mysqlmanager.log'...
[21032/136318976] [07/06/19 11:11:03] [INFO] Angel: daemonizing...
[21032/136318976] [07/06/19 11:11:03] [INFO] Angel: exiting from the original process...
[21032/136318976] [07/06/19 11:11:03] [INFO] IM: finished.
[21033/136318976] [07/06/19 11:11:03] [INFO] Angel: preparing standard streams.

在启动 mysqlmanager 的同时，也会把它管理的所有 MySQL实例 全部启动。

[root@localhost]# mysql -uyejr -P1999 -hlocalhost -S/tmp/manager.sock -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1 to server version: 1.0-beta

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

(yejr:localhost:)(none)> SHOW INSTANCES;
+---------------+--------+
| instance_name | state  |
+---------------+--------+
| mysqld1       | online |
| mysqld2       | online |
| mysqld3       | online |
+---------------+--------+

2、mysqlmanager 状态查看

(yejr:localhost:)(none)> SHOW INSTANCE STATUS mysqld1\G
*************************** 1. row ***************************
    instance_name: mysqld1
            state: online
   version_number: 5.1.19
          version: 5.1.19-beta for unknown-freebsd6.0 on i386 (MySQL Community Server (GPL))
mysqld_compatible: no

(yejr:localhost:)(none)> SHOW INSTANCE OPTIONS mysqld1;
+---------------+----------------------------------------------+
| option_name   | value                                        |
+---------------+----------------------------------------------+
| instance_name | mysqld1                                      |
| basedir       | /usr/local/mysql                             |
| datadir       | /usr/local/mysql/data1                       |
| general-log   | true                                         |
| log-error     | /usr/local/mysql/data1/error.log             |
| pid-file      | /usr/local/mysql/data1/mysql.pid             |
| port          | 13306                                        |
| socket        | /tmp/mysql13306.sock                         |
+---------------+----------------------------------------------+

(yejr:localhost:)(none)> SHOW mysqld1 LOG FILES;
+-----------+----------------------------------+-----------+
| Logfile   | Path                             | File size |
+-----------+----------------------------------+-----------+
| ERROR LOG | /usr/local/mysql/data1/error.log | 2976      |
+-----------+----------------------------------+-----------+

(yejr:localhost:)(none)> SHOW mysqld13306 LOG ERROR 2976\G
*************************** 1. row ***************************
070619 11:17:57 [Warning] Server variable data_file_path of plugin InnoDB was forced to be read-only: string variable
without update_func and PLUGIN_VAR_MEMALLOC flag
070619 11:17:57 [Warning] Server variable data_home_dir of plugin InnoDB was forced to be read-only: string variable
without update_func and PLUGIN_VAR_MEMALLOC flag
070619 11:17:57 [Warning] Server variable flush_method of plugin InnoDB was forced to be read-only: string variable
without update_func and PLUGIN_VAR_MEMALLOC flag
070619 11:17:57 [Warning] Server variable log_arch_dir of plugin InnoDB was forced to be read-only: string variable
without update_func and PLUGIN_VAR_MEMALLOC flag
070619 11:17:57 [Warning] Server variable log_group_home_dir of plugin InnoDB was forced to be read-only: string
variable without update_func and PLUGIN_VAR_MEMALLOC flag
070619 11:17:57  InnoDB: Started; log sequence number 0 48402
070619 11:17:57 [Note] Event Scheduler: Loaded 0 events
070619 11:17:57 [Note] /usr/local/mysql/bin/mysqld: ready for connections.
Version: '5.1.19-beta'  socket: '/tmp/mysql13306.sock'  port: 13306  MySQL Community Server (GPL)

更多的可操作命令可以参考手册。

3、mysqlmanager 管理
停止 MySQL实例：

(yejr:localhost:)(none)> STOP INSTANCE mysqld1;
Query OK, 0 rows affected (1.81 sec)

(yejr:localhost:)(none)> SHOW INSTANCES;
+---------------+---------+
| instance_name | state   |
+---------------+---------+
| mysqld1       | offline |
| mysqld2       | online  |
| mysqld3       | online  |
+---------------+---------+

(yejr:localhost:)(none)> START INSTANCE mysqld1;
Query OK, 0 rows affected (0.00 sec)
Instance started

(yejr:localhost:)(none)> SHOW INSTANCES;
+---------------+--------+
| instance_name | state  |
+---------------+--------+
| mysqld1       | online |
| mysqld2       | online |
| mysqld3       | online |
+---------------+--------+

(yejr:localhost:)(none)> STOP INSTANCE mysqld2;
Query OK, 0 rows affected (1.81 sec)

(yejr:localhost:)(none)> STOP INSTANCE mysqld3;
Query OK, 0 rows affected (1.81 sec)

(yejr:localhost:)(none)> SHOW INSTANCES;
+---------------+---------+
| instance_name | state   |
+---------------+---------+
| mysqld1       | offline |
| mysqld2       | offline |
| mysqld3       | offline |
+---------------+---------+

(yejr:localhost:)(none)> FLUSH INSTANCES;
Query OK, 0 rows affected (0.09 sec)

(yejr:localhost:)(none)> SHOW INSTANCES;
+---------------+--------+
| instance_name | state  |
+---------------+--------+
| mysqld1       | online |
| mysqld2       | online |
| mysqld3       | online |
+---------------+--------+

在 MySQL实例 停止的状态下，还可以动态的修改端口等参数。
注意： FLUSH INSTANCES 语法会在 MySQL 5.2 以后不再使用。

总结：通过 mysqlmanager 我们就可以远程来管理 mysqld，包括重启，查看日志，设定系统参数等。而无需直接登录服务器或者通过 mysql 客户端登录服务器，也进一步保护了 MySQL 账户的安全，这在有较多数量的 MySQL 服务器引用环境中还是很有帮助的。
责任编辑: admin