--proxy-backend-addresses=host:port — the hostname (or IP address) and port of the MySQL server to connect to. You can specify multiple backend servers by supplying multiple options. Clients are connected to each backend server in round-robin fashion. For example, if you specify two servers A and B, the first client connection will go to server A; the second client connection to server B and the third client connection to server A.你多建几个连接就知道怎么回事了,它用简单的round-robin(轮询)算法实现多台机时的负载均衡的。
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