配置完mysql-proxy.conf后需要确保该文件的权限是600，并确保包含个lua脚本
通过配置文件启动mysql-proxy
| /usr/local/mysql-proxy/bin/mysql-proxy --plugins=proxy --plugins=admin --defaults-file=mysql-proxy.conf --plugins=proxy #指定proxy插件，该配置写入配置文件无法启动 --plugins=admin #指定admin插件 --defaults-file=mysql-proxy.conf #指定配置文件 |
4、启动测试
登录管理地址查看当前状态
| mysql -uadmin -padmin -h192.168.216.132 -P4041 |
两个后端服务器当前状态为unknown是因为没有用户通过mysql-proxy连接到后端
mysql-proxy不对用户做身份验证，而是下身份验证交予后端服务器进行验证的，因此需要在后端服务器上对mysql-proxy开放权限
下面是自定义的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 |
5、相关问题解决
（1）、如果日志中提示 (debug) [network-mysqld.c:1134]: error on a connection (fd: -1 event: 0). closing client connection.
可以修改 rw-splitting.lua中的min_idle_connections = 4和max_idle_connections = 8的只，将其调大
