Mysql-Proxy 读写分离
大纲
一、Mysql-Proxy 简单介绍
二、环境准备
三、Mysql-Proxy 命令简介
四、Mysql-Proxy主从分离
注，此实验是基于上一篇博客，http://freeloda.blog.51cto.com/2033581/1282879，先实现主从复制，再实现读写分离。（对于主从复制不清楚的博友可以参考一下）
一、Mysql-Proxy 简单介绍
MySQL-Proxy是一个处于你的client端和MySQL server端之间的简单程序，它可以监测、分析或改变它们的通信。它使用灵活，没有限制，常见的用途包括：负载平衡，故障、查询分析，查询过滤和修改等等。
MySQL-Proxy就是这么一个中间层代理，简单的说，MySQL-Proxy就是一个连接池，负责将前台应用的连接请求转发给后台的数据库，并且通过使用lua脚本，可以实现复杂的连接控制和过滤，从而实现读写分离和负载平衡。对于应用来说，MySQL-Proxy是完全透明的，应用则只需要连接到MySQL-Proxy的监听端口即可。当然，这样proxy机器可能成为单点失效，但完全可以使用多个proxy机器做为冗余，在应用服务器的连接池配置中配置到多个proxy的连接参数即可。
MySQL-Proxy更强大的一项功能是实现“读写分离”，基本原理是让主数据库处理事务性查询，让从库处理SELECT查询。数据库复制被用来把事务性查询导致的变更同步到集群中的从库。
二、环境准备
1.实验拓扑
2.操作系统
CentOS 6.4 x86_64
3.软件版本
Mysql-Proxy0.8.3
4.时间同步
|
1
2
3
|
[root@proxy ~]
# ntpdate 202.120.2.101
[root@master ~]
# ntpdate 202.120.2.101
[root@slave ~]
# ntpdate 202.120.2.101
|
三、Mysql-Proxy 命令简介
mysql-proxy 命令
--help-all ―――― 用于获取全部帮助信息
--proxy-address=host:port ―――― 代理服务监听的地址和端口
--admin-address=host:port ―――― 管理模块监听的地址和端口
--proxy-backend-addresses=host:port ―――― 后端mysql服务器的地址和端口（主服务器）
--proxy-read-only-backend-addresses=host:port ―――― 后端只读mysql服务器的地址和端口（从服务器）
--proxy-lua-script=file ―――― 完成mysql代理功能的Lua脚本
--daemon ―――― 以守护进程模式启动mysql-proxy
--defaults-file=/path/to/conf_file_name ―――― 默认使用的配置文件路径
--log-file=/path/to/log_file_name ―――― 日志文件名称
--log-level=level ―――― 日志级别
--log-use-syslog ―――― 基于syslog记录日志
--user=user_name ―――― 运行mysql-proxy进程的用户
四、Mysql-Proxy主从分离
1.增加代理用户
|
1
2
3
4
|
[root@proxy ~]
# groupadd -g 3306 mysql-proxy
[root@proxy ~]
# useradd -u 3306 -g mysql-proxy -s /sbin/nologin -M mysql-proxy
[root@proxy ~]
# id mysql-proxy
uid=3306(mysql-proxy) gid=3306(mysql-proxy) 组=3306(mysql-proxy)
|
2.安装mysql-proxy
|
1
2
3
4
5
6
7
8
9
10
11
12
13
|
[root@proxy src]
# tar xf mysql-proxy-0.8.3-linux-glibc2.3-x86-64bit.tar.gz -C /usr/local/
[root@proxy src]
# cd /usr/local/
[root@proxy
local
]
# ln -sv mysql-proxy-0.8.3-linux-glibc2.3-x86-64bit mysql-proxy
"mysql-proxy"
->
"mysql-proxy-0.8.3-linux-glibc2.3-x86-64bit"
[root@proxy
local
]
# cd mysql-proxy
[root@proxy mysql-proxy]
# ll
总用量 24
drwxr-xr-x 2 7157 wheel 4096 8月 6 2012 bin
drwxr-xr-x 2 7157 wheel 4096 8月 6 2012 include
drwxr-xr-x 4 7157 wheel 4096 8月 6 2012 lib
drwxr-xr-x 2 7157 wheel 4096 8月 6 2012 libexec
drwxr-xr-x 3 7157 wheel 4096 8月 6 2012 licenses
drwxr-xr-x 3 7157 wheel 4096 8月 6 2012 share
|
3.修改文件的拥有者与所属组
|
1
2
3
4
5
6
7
8
9
|
[root@proxy mysql-proxy]
# chown -R root:mysql-proxy /usr/local/mysql-proxy/*
[root@proxy mysql-proxy]
# ll
总用量 24
drwxr-xr-x 2 root mysql-proxy 4096 8月 6 2012 bin
drwxr-xr-x 2 root mysql-proxy 4096 8月 6 2012 include
drwxr-xr-x 4 root mysql-proxy 4096 8月 6 2012 lib
drwxr-xr-x 2 root mysql-proxy 4096 8月 6 2012 libexec
drwxr-xr-x 3 root mysql-proxy 4096 8月 6 2012 licenses
drwxr-xr-x 3 root mysql-proxy 4096 8月 6 2012 share
|
4.修改PATH环境变量
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
[root@proxy ~]
# vim /etc/profile.d/mysql-proxy.sh
export
PATH=$PATH:
/usr/local/mysql-proxy/bin
[root@proxy ~]
# source /etc/profile
[root@proxy ~]
# mysql-proxy --help-all
Usage:
mysql-proxy [OPTION...] - MySQL Proxy
Help Options:
-?, --help Show help options
--help-all Show all help options
--help-proxy Show options
for
the proxy-module
proxy-module
-P, --proxy-address=<host:port> listening address:port of the proxy-server (default: :4040)
-r, --proxy-
read
-only-backend-addresses=<host:port> address:port of the remote slave-server (default: not
set
)
-b, --proxy-backend-addresses=<host:port> address:port of the remote backend-servers (default: 127.0.0.1:3306)
--proxy-skip-profiling disables profiling of queries (default: enabled)
--proxy-fix-bug-25371 fix bug
#25371 (mysqld > 5.1.12) for older libmysql versions
-s, --proxy-lua-script=<
file
> filename of the lua script (default: not
set
)
--no-proxy don't start the proxy-module (default: enabled)
--proxy-pool-no-change-user don't use CHANGE_USER to reset the connection coming from the pool (default: enabled)
--proxy-connect-timeout connect timeout
in
seconds (default: 2.0 seconds)
--proxy-
read
-timeout
read
timeout
in
seconds (default: 8 hours)
--proxy-write-timeout write timeout
in
seconds (default: 8 hours)
Application Options:
-V, --version Show version
--defaults-
file
=<
file
> configuration
file
--verbose-
shutdown
Always log the
exit
code when shutting down
--daemon Start
in
daemon-mode
--user=<user> Run mysql-proxy as user
--basedir=<absolute path> Base directory to prepend to relative paths
in
the config
--pid-
file
=<
file
> PID
file
in
case
we are started as daemon
--plugin-
dir
=<path> path to the plugins
--plugins=<name> plugins to load
--log-level=(error|warning|info|message|debug) log all messages of level ... or higher
--log-
file
=<
file
> log all messages
in
a
file
--log-use-syslog log all messages to syslog
--log-backtrace-on-crash try to invoke debugger on crash
--keepalive try to restart the proxy
if
it crashed
--max-
open
-files maximum number of
open
files (
ulimit
-n)
--event-threads number of event-handling threads (default: 1)
--lua-path=<...>
set
the LUA_PATH
--lua-cpath=<...>
set
the LUA_CPATH
|
5.启动mysql-proxy
|
1
2
3
4
5
6
7
8
9
10
11
12
|
[root@proxy ~]
# mysql-proxy --daemon --log-level=debug --log-file=/var/log/mysql-proxy.log --plugins="proxy" --proxy-backend-addresses="192.168.18.201:3306" --proxy-read-only-backend-addresses="192.168.18.202:3306" #启动mysql-proxy
[root@proxy ~]
# tail /var/log/mysql-proxy.log #查看启动日志
2013-08-27 09:58:42: (critical) mysql-proxy-cli.c:597: Failure from chassis_mainloop. Shutting down.
2013-08-27 09:58:42: (message) Initiating
shutdown
, requested from mysql-proxy-cli.c:598
2013-08-27 09:58:42: (message) shutting down normally,
exit
code is: 1
2013-08-27 09:59:14: (message) Initiating
shutdown
, requested from signal handler
2013-08-27 09:59:14: (message) shutting down normally,
exit
code is: 0
2013-08-27 09:59:26: (critical) plugin proxy 0.8.3 started
2013-08-27 09:59:26: (debug) max
open
file
-descriptors = 1024
2013-08-27 09:59:26: (message) proxy listening on port :4040
2013-08-27 09:59:26: (message) added
read
/write
backend: 192.168.18.201:3306
2013-08-27 09:59:26: (message) added
read
-only backend: 192.168.18.202:3306
|
注，从日志可以看启动成功
|
1
2
|
[root@proxy ~]
# netstat -ntulp | grep :4040 #查看端口
tcp 0 0 0.0.0.0:4040 0.0.0.0:* LISTEN 1554
/mysql-proxy
|
6.在主服务器上创建测试的账号与密码
master:
|
1
2
3
4
|
mysql> GRANT ALL ON *.* TO root@
'192.168.18.%'
IDENTIFIED BY
'123456'
;
Query OK, 0 rows affected (0.07 sec)
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.04 sec)
|
7.在从服务上进行测试
slave:
注，验证是否能通过代理端口4040 端口连接到 mysql-proxy
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
|
[root@slave ~]
# mysql -uroot -p -h192.168.18.203 --port=4040
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection
id
is 10
Server version: 5.6.13-log MySQL Community Server (GPL)
Copyright (c) 2000, 2013, Oracle and
/or
its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and
/or
its
affiliates. Other names may be trademarks of their respective
owners.
Type
'help;'
or
'\h'
for
help. Type
'\c'
to
clear
the current input statement.
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mydb |
| mydb1 |
| mysql |
| performance_schema |
|
test
|
+--------------------+
6 rows
in
set
(0.00 sec)
|
注，已经成功从4040端口，连接进mysql-proxy。下面我们来实现读写分离。
8.Mysql-Proxy本身不会实现读写分离，主要是依靠 Lua 脚本实现的，在 mysql-proxy 主机上 杀死mysql-proxy 进程并添加读写分离脚本
|
1
2
|
[root@proxy ~]
# killall mysql-proxy
[root@proxy ~]
# netstat -ntulp | grep 4040
|
9.在mysql-proxy 的安装目录中有一个rw-splitting.lua 脚本，专门用来实现 读写分离，路径是/usr/local/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua
|
1
2
3
|
[root@proxy ~]
# cd /usr/local/mysql-proxy/share/doc/mysql-proxy/
[root@proxy mysql-proxy]
# ls | grep rw-splitting.lua
rw-splitting.lua
|
10.重新启动mysql-proxy，把此脚本加入到启动选项里面，实现读写分离
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
[root@proxy ~]
# mysql-proxy --daemon --log-level=debug --log-file=/var/log/mysql-proxy.log --plugins="proxy" --proxy-backend-addresses="192.168.18.201:3306" --proxy-read-only-backend-addresses="192.168.18.202:3306" --proxy-lua-script=" /usr/local/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua"
[root@proxy ~]
# tail /var/log/mysql-proxy.log #查看日志
2013-08-27 09:59:26: (message) added
read
/write
backend: 192.168.18.201:3306
2013-08-27 09:59:26: (message) added
read
-only backend: 192.168.18.202:3306
2013-08-27 10:05:51: (message) Initiating
shutdown
, requested from signal handler
2013-08-27 10:05:51: (message) shutting down normally,
exit
code is: 0
2013-08-27 10:10:29: (debug) chassis-path.c.122: adjusting relative path (
/usr/local/mysql-proxy/share/doc/mysql-proxy/rw-splitting
.lua) to base_dir (
/usr/local/mysql-proxy-0
.8.3-linux-glibc2.3-x86-64bit). New path:
/usr/local/mysql-proxy-0
.8.3-linux-glibc2.3-x86-64bit/
/usr/local/mysql-proxy/share/doc/mysql-proxy/rw-splitting
.lua
2013-08-27 10:10:29: (critical) plugin proxy 0.8.3 started
2013-08-27 10:10:29: (debug) max
open
file
-descriptors = 1024
2013-08-27 10:10:29: (message) proxy listening on port :4040
2013-08-27 10:10:29: (message) added
read
/write
backend: 192.168.18.201:3306
2013-08-27 10:10:29: (message) added
read
-only backend: 192.168.18.202:3306
[root@proxy ~]
# netstat -ntlp | grep :4040 #查看一下端口
tcp 0 0 0.0.0.0:4040 0.0.0.0:* LISTEN 2944
/mysql-proxy
|
11.为mysql-proxy 提供一个管理接口，方便以后随时查看后端mysql 服务器的状态和访问类型，实现管理功能
注，下面为大家提供一个管理接口的脚本，同样也是一个LUA 脚本，建议跟 读写分离脚本放在同一目录。
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
[root@proxy ~]
# vim /usr/local/mysql-proxy/share/doc/mysql-proxy/admin.lua
function
set_error(errmsg)
proxy.response = {
type
= proxy.MYSQLD_PACKET_ERR,
errmsg = errmsg or
"error"
}
end
function
read_query(packet)
if
packet:byte() ~= proxy.COM_QUERY
then
set_error(
"[admin] we only handle text-based queries (COM_QUERY)"
)
return
proxy.PROXY_SEND_RESULT
end
local
query = packet:sub(2)
local
rows = { }
local
fields = { }
if
query:lower() ==
"select * from backends"
then
fields = {
{ name =
"backend_ndx"
,
type
= proxy.MYSQL_TYPE_LONG },
{ name =
"address"
,
type
= proxy.MYSQL_TYPE_STRING },
{ name =
"state"
,
type
= proxy.MYSQL_TYPE_STRING },
{ name =
"type"
,
type
= proxy.MYSQL_TYPE_STRING },
{ name =
"uuid"
,
type
= proxy.MYSQL_TYPE_STRING },
{ name =
"connected_clients"
,
type
= proxy.MYSQL_TYPE_LONG },
}
for
i = 1,
#proxy.global.backends do
local
states = {
"unknown"
,
"up"
,
"down"
}
local
types = {
"unknown"
,
"rw"
,
"ro"
}
local
b = proxy.global.backends[i]
rows[
#rows + 1] = {
i,
b.dst.name, -- configured backend address
states[b.state + 1], -- the C-
id
is pushed down starting at 0
types[b.
type
+ 1], -- the C-
id
is pushed down starting at 0
b.uuid, -- the MySQL Server's UUID
if
it is managed
b.connected_clients -- currently connected clients
}
end
elseif query:lower() ==
"select * from help"
then
fields = {
{ name =
"command"
,
type
= proxy.MYSQL_TYPE_STRING },
{ name =
"description"
,
type
= proxy.MYSQL_TYPE_STRING },
}
rows[
#rows + 1] = { "SELECT * FROM help", "shows this help" }
rows[
#rows + 1] = { "SELECT * FROM backends", "lists the backends and their state" }
else
set_error(
"use 'SELECT * FROM help' to see the supported commands"
)
return
proxy.PROXY_SEND_RESULT
end
proxy.response = {
type
= proxy.MYSQLD_PACKET_OK,
resultset = {
fields = fields,
rows = rows
}
}
return
proxy.PROXY_SEND_RESULT
end
|
12.重新启动mysql-proxy
注，这次启动要添加以下启动选项 ，因为我们添加了额外的插件，把新加功能添加进来,选项如下。
--plugins=admin 在mysql-proxy启动时加载的插件；
--admin-username="admin" 运行mysql-proxy进程管理的用户；
--admin-password="admin" 密码
--admin-lua-script="/usr/local/mysql-proxy/share/doc/mysql-proxy/admin.lua" 插件使用的配置文件路径；
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
[root@proxy ~]
# mysql-proxy --daemon --log-level=debug --log-file=/var/log/mysql-proxy.log --plugins="proxy" --proxy-backend-addresses="192.168.18.201:3306" --proxy-read-only-backend-addresses="192.168.18.202:3306" --proxy-lua-script=" /usr/local/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua" --plugins=admin --admin-username="admin" --admin-password="admin" --admin-lua-script="/usr/local/mysql-proxy/share/doc/mysql-proxy/admin.lua"
[root@proxy ~]
# netstat �Cntlp #查看一下端口
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID
/Program
name
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1066
/rpcbind
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1223
/sshd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 1299
/master
tcp 0 0 0.0.0.0:54053 0.0.0.0:* LISTEN 1084
/rpc
.statd
tcp 0 0 0.0.0.0:4040 0.0.0.0:* LISTEN 2970
/mysql-proxy
tcp 0 0 0.0.0.0:4041 0.0.0.0:* LISTEN 2970
/mysql-proxy
#生成新的管理端口4041
tcp 0 0 :::111 :::* LISTEN 1066
/rpcbind
tcp 0 0 :::22 :::* LISTEN 1223
/sshd
tcp 0 0 :::39894 :::* LISTEN 1084
/rpc
.statd
tcp 0 0 ::1:25 :::* LISTEN 1299
/master
|
13.在slave测试一下，记得使用管理端口4041 登陆，密码是admin。
|
1
2
3
4
5
6
7
8
9
10
11
|
[root@slave ~]
# mysql -uadmin -p -h192.168.18.203 --port 4041
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection
id
is 1
Server version: 5.0.99-agent-admin
Copyright (c) 2000, 2013, Oracle and
/or
its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and
/or
its
affiliates. Other names may be trademarks of their respective
owners.
Type
'help;'
or
'\h'
for
help. Type
'\c'
to
clear
the current input statement.
mysql>
|
注，登录成功，下面我们来查看一下状态。
14.测试读写分离状态
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
|
[root@slave ~]
# mysql -uadmin -p -h192.168.18.203 --port 4041 -padmin
Warning: Using a password on the
command
line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection
id
is 1
Server version: 5.0.99-agent-admin
Copyright (c) 2000, 2013, Oracle and
/or
its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and
/or
its
affiliates. Other names may be trademarks of their respective
owners.
Type
'help;'
or
'\h'
for
help. Type
'\c'
to
clear
the current input statement.
mysql>
select
* from backends;
+-------------+---------------------+---------+------+------+-------------------+
| backend_ndx | address | state |
type
| uuid | connected_clients |
+-------------+---------------------+---------+------+------+-------------------+
| 1 | 192.168.18.201:3306 | unknown | rw | NULL | 0 |
| 2 | 192.168.18.202:3306 | unknown | ro | NULL | 0 |
+-------------+---------------------+---------+------+------+-------------------+
2 rows
in
set
(0.00 sec)
|
注，大家可以看到状态信息是unknown，因为我们还没有执行读写操作，所有状态还有UP起来，下面我们来测试一下读写信息，再来查看状态。
15.执行一下读写操作
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
|
[root@slave ~]
# mysql -uroot -p -h192.168.18.203 --port=4040 -e "select user from mysql.user;"
Enter password:
+----------+
| user |
+----------+
| root |
| repluser |
| root |
| root |
| |
| root |
| |
| root |
+----------+
[root@slave ~]
# mysql -uroot -p -h192.168.18.203 --port=4040 -e "create database mydb2;"
|
16.再次查看一下读写分离状态
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
|
[root@slave ~]
# mysql -uadmin -p -h192.168.18.203 --port=4041
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection
id
is 1
Server version: 5.0.99-agent-admin
Copyright (c) 2000, 2013, Oracle and
/or
its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and
/or
its
affiliates. Other names may be trademarks of their respective
owners.
Type
'help;'
or
'\h'
for
help. Type
'\c'
to
clear
the current input statement.
mysql> SELECT * FROM backends;
+-------------+---------------------+-------+------+------+-------------------+
| backend_ndx | address | state |
type
| uuid | connected_clients |
+-------------+---------------------+-------+------+------+-------------------+
| 1 | 192.168.18.201:3306 | up | rw | NULL | 0 |
| 2 | 192.168.18.202:3306 | up | ro | NULL | 0 |
+-------------+---------------------+-------+------+------+-------------------+
2 rows
in
set
(0.00 sec)
mysql>
|
注，大家可以看到，这时状态全部是up。说明读写分离配置成功。 在测试读写分离的时候，我们可以分布测试，比如先测试读的语句，查看读写状态是否UP ，然后在测试写的语句，反反复复多测试几次才能看出效果，本人在测试的时候也出现过读的状态不能up，解决办法是：多测试即便就出来了。好了，读写分离配置全部完成，下面我们进行优化一下，大家可以看到，启动mysql-proxy时要写很多参数，能不能写到一个文件中呢？还有连接mysql-proxy时，用的端口是4040，我们能不能修改为3306呢？答案是可以的下面我们优化一下。
17.优化配置启动脚本，并修连接端口。
注，博友看到每次启动的时候，启动选项非常多，一不小心都会写错，所以我们创建一个脚本或者配置文件把选项都写进去，每次启动的时候都调用此脚本。
(1).增加配置文件
|
1
2
3
4
5
6
7
8
9
|
[root@proxy ~]
# vim /etc/sysconfig/mysql-proxy
# Options for mysql-proxy
ADMIN_USER=
"admin"
ADMIN_PASSWORD=
"admin"
ADMIN_ADDRESS=
""
ADMIN_LUA_SCRIPT=
"/usr/local/mysql-proxy/share/doc/mysql-proxy/admin.lua"
PROXY_ADDRESS=
"0.0.0.0:3306"
PROXY_USER=
"mysql-proxy"
PROXY_OPTIONS=
"--daemon --log-level=info --log-file="
/var/log/mysql-proxy
.log
" --plugins=proxy --plugins=admin --proxy-backend-addresses=192.168.18.201:3306 --proxy-read-only-backend-addresses=192.168.18.202:3306 --proxy-lua-script=/usr/local/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua"
|
(2).增加sysV脚本
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
[root@proxy ~]
# vim /etc/init.d/mysql-proxy #增加sysV脚本
#!/bin/bash
#
# mysql-proxy This script starts and stops the mysql-proxy daemon
#
# chkconfig: - 78 30
# processname: mysql-proxy
# description: mysql-proxy is a proxy daemon for mysql
# Source function library.
.
/etc/rc
.d
/init
.d
/functions
prog=
"/usr/local/mysql-proxy/bin/mysql-proxy"
# Source networking configuration.
if
[ -f
/etc/sysconfig/network
];
then
.
/etc/sysconfig/network
fi
# Check that networking is up.
[ ${NETWORKING} =
"no"
] &&
exit
0
# Set default mysql-proxy configuration.
ADMIN_USER=
"admin"
ADMIN_PASSWD=
"admin"
ADMIN_LUA_SCRIPT=
"/usr/local/mysql-proxy/share/doc/mysql-proxy/admin.lua"
PROXY_OPTIONS=
"--daemon"
PROXY_PID=
/var/run/mysql-proxy
.pid
PROXY_USER=
"mysql-proxy"
# Source mysql-proxy configuration.
if
[ -f
/etc/sysconfig/mysql-proxy
];
then
.
/etc/sysconfig/mysql-proxy
fi
RETVAL=0
start() {
echo
-n $
"Starting $prog: "
daemon $prog $PROXY_OPTIONS --pid-
file
=$PROXY_PID --proxy-address=
"$PROXY_ADDRESS"
--user=$PROXY_USER --admin-username=
"$ADMIN_USER"
--admin-lua-script=
"$ADMIN_LUA_SCRIPT"
--admin-password=
"$ADMIN_PASSWORD"
RETVAL=$?
echo
if
[ $RETVAL -
eq
0 ];
then
touch
/var/lock/subsys/mysql-proxy
fi
}
stop() {
echo
-n $
"Stopping $prog: "
killproc -p $PROXY_PID -d 3 $prog
RETVAL=$?
echo
if
[ $RETVAL -
eq
0 ];
then
rm
-f
/var/lock/subsys/mysql-proxy
rm
-f $PROXY_PID
fi
}
# See how we were called.
case
"$1"
in
start)
start
;;
stop)
stop
;;
restart)
stop
start
;;
condrestart|try-restart)
if
status -p $PROXY_PIDFILE $prog >&
/dev/null
;
then
stop
start
fi
;;
status)
status -p $PROXY_PID $prog
;;
*)
echo
"Usage: $0 {start|stop|restart|reload|status|condrestart|try-restart}"
RETVAL=1
;;
esac
exit
$RETVAL
|
|
1
2
3
|
[root@proxy ~]
# chmod +x /etc/rc.d/init.d/mysql-proxy #增加执行权限
[root@proxy ~]
# chkconfig --add mysql-proxy #加入服务
[root@proxy ~]
# killall mysql-proxy #关闭mysql-proxy
|
18.启动并测试一下脚本
(1).启动并查看日志与端口
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
[root@proxy ~]
# service mysql-proxy start #启动mysql-proxy
正在启动
/usr/local/mysql-proxy/bin/mysql-proxy
： [确定]
[root@proxy ~]
# netstat �Cntulp #查看一下端口
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID
/Program
name
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1066
/rpcbind
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1223
/sshd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 1299
/master
tcp 0 0 0.0.0.0:54053 0.0.0.0:* LISTEN 1084
/rpc
.statd
tcp 0 0 0.0.0.0:4041 0.0.0.0:* LISTEN 3084
/mysql-proxy
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 3084
/mysql-proxy
#大家可以看到端口已变为3306
tcp 0 0 :::111 :::* LISTEN 1066
/rpcbind
tcp 0 0 :::22 :::* LISTEN 1223
/sshd
tcp 0 0 :::39894 :::* LISTEN 1084
/rpc
.statd
tcp 0 0 ::1:25 :::* LISTEN 1299
/master
udp 0 0 0.0.0.0:37355 0.0.0.0:* 1084
/rpc
.statd
udp 0 0 0.0.0.0:111 0.0.0.0:* 1066
/rpcbind
udp 0 0 0.0.0.0:817 0.0.0.0:* 1066
/rpcbind
udp 0 0 0.0.0.0:836 0.0.0.0:* 1084
/rpc
.statd
udp 0 0 :::111 :::* 1066
/rpcbind
udp 0 0 :::817 :::* 1066
/rpcbind
udp 0 0 :::43102 :::* 1084
/rpc
.statd
[root@proxy ~]
# tail /var/log/mysql-proxy.log #查看一下日志
2013-08-27 10:54:07: (message) added
read
/write
backend: 192.168.18.201:3306
2013-08-27 10:54:07: (message) added
read
-only backend: 192.168.18.202:3306
2013-08-27 10:56:38: (debug) [network-mysqld.c:1134]: error on a connection (fd: -1 event: 0). closing client connection.
2013-08-27 11:22:52: (message) Initiating
shutdown
, requested from signal handler
2013-08-27 11:22:52: (message) shutting down normally,
exit
code is: 0
2013-08-27 11:25:56: (critical) plugin proxy 0.8.3 started
2013-08-27 11:25:56: (critical) plugin admin 0.8.3 started
2013-08-27 11:25:56: (message) proxy listening on port 0.0.0.0:3306
2013-08-27 11:25:56: (message) added
read
/write
backend: 192.168.18.201:3306
2013-08-27 11:25:56: (message) added
read
-only backend: 192.168.18.202:3306
|
(2).测试连接一下
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
|
[root@slave ~]
# mysql -uroot -p -h192.168.18.203
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection
id
is 18
Server version: 5.6.13-log MySQL Community Server (GPL)
Copyright (c) 2000, 2013, Oracle and
/or
its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and
/or
its
affiliates. Other names may be trademarks of their respective
owners.
Type
'help;'
or
'\h'
for
help. Type
'\c'
to
clear
the current input statement.
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mydb |
| mydb1 |
| mydb2 |
| mydb3 |
| mysql |
| performance_schema |
|
test
|
+--------------------+
8 rows
in
set
(0.00 sec)
mysql>
|
注，大家可以看到，现在连接不用指定端口，默认使用3306端口。好了，到这里mysql-proxy实现读写分离配置全部完成，希望大家有所收获。^_^……