PXC部署，配置，操做原理

參考： https://www.cnblogs.com/kevingrace/p/5685371.html?utm_source=itdadao&utm_medium=referra       http://www.javashuo.com/article/p-ydyclpnr-k.html       https://www.linuxidc.com/Linux/2017-05/143519.

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