再做读写分离时，这样做是没问题的
[root@proxy mysql-proxy]# mysql-proxy --daemon --plugins=proxy --log-level=debug --log-file=/var/log/mysql-proxy.log --proxy-read-only-backend-addresses=192.168.85.145:3306 --proxy-backend-addresses=192.168.85.144:3306 --proxy-lua-script=/usr/local/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua --plugins=admin --admin-username=admini --admin-password=admini --admin-lua-script=/usr/local/mysql-proxy/share/doc/mysql-proxy/admin.lua

无论是4041端口还是4040端口都能登录上去也添加了后端服务器，日志显示：
[root@proxy mysql-proxy]# tail /var/log/mysql-proxy.log
2015-12-31 10:50:41: (critical) plugin proxy 0.8.5 started
2015-12-31 10:50:41: (critical) plugin admin 0.8.5 started
2015-12-31 10:50:41: (debug) max open file-descriptors = 1024
2015-12-31 10:50:41: (message) proxy listening on port :4040
2015-12-31 10:50:41: (message) added read/write backend: 192.168.85.144:3306
2015-12-31 10:50:41: (message) added read-only backend: 192.168.85.145:3306
2015-12-31 10:50:41: (message) admin-server listening on port :4041

但是这样写不是很麻烦嘛，就想着编写一个配置文件 ，通过读取配置文件中的设置启动mysql-proxy，但是4040端口却无论如何也无法启动

第一次配置文件内容：
[root@proxy ~]# cat /etc/mysql-proxy.conf
[mysql-proxy]
pid-file = /var/run/mysql-proxy.pid
log-file = /var/log/mysql-proxy.log
log-level = debug
plugins = admin
plugins = proxy
#
#Proxy Configuration
user = proxy
proxy-address = 192.168.85.128:4040
proxy-backend-addresses = 192.168.85.144:3306
proxy-read-only-backend-addresses = 192.168.85.145:3306
proxy-lua-script = /usr/local/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua
#

Admin Configuration

admin-username = admini
admin-password = admini
admin-lua-script=/usr/local/mysql-proxy/share/doc/mysql-proxy/admin.lua

然后mysql-proxy --daemon --defaults-file=/etc/mysql-proxy.conf

此时的日志：
2016-01-01 16:28:09: (critical) plugin proxy 0.8.5 started
2016-01-01 16:28:09: (debug) max open file-descriptors = 1024
2016-01-01 16:28:09: (message) proxy listening on port 192.168.85.128:4040
2016-01-01 16:28:09: (message) added read/write backend: 192.168.85.144:3306
2016-01-01 16:28:09: (message) added read-only backend: 192.168.85.145:3306
2016-01-01 16:28:09: (debug) now running as user: proxy (496/493)
后端服务器也都加了，4040端口启动了，也能正常登录上去，但是4041端口没有开启；

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然后，我改了一下配置文件(其实就是proxy和admin插件的位置换了一下)
第二次配置文件内容：
[mysql-proxy]
pid-file = /var/run/mysql-proxy.pid
log-file = /var/log/mysql-proxy.log
log-level = debug
plugins = proxy
plugins = admin
#
#Proxy Configuration
user = proxy
proxy-address = 192.168.85.128:4040
proxy-backend-addresses = 192.168.85.144:3306
proxy-read-only-backend-addresses = 192.168.85.145:3306
proxy-lua-script = /usr/local/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua
#proxy-skip-profiling = true
#

Admin Configuration

#admin-address = 0.0.0.0:4041
admin-username = admini
admin-password = admini
admin-lua-script=/usr/local/mysql-proxy/share/doc/mysql-proxy/admin.lua

再次启动后的日志：
2016-01-01 16:33:35: (critical) plugin admin 0.8.5 started
2016-01-01 16:33:35: (debug) max open file-descriptors = 1024
2016-01-01 16:33:35: (message) admin-server listening on port :4041
2016-01-01 16:33:35: (debug) now running as user: proxy (496/493)
这下子，不仅4040端口未打开，连服务器都未加入，只有4041端口在开着；

以后无论我怎么改配置文件，只要plugins=admin选项在plugins=proxy后都是出现第二种情况也就是只有4041端口打开，只有第一次的配置文件才是4040端口打开，而且怎么都无法做到4040和4041端口同时开启；

怎样才能打开4040和4041端口以及加入后端服务器？还是说配置文件我写错了？