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物理机装有mysql，端口号3306，
镜像里面有个mysql，镜像内部的端口3306，物理机的端口没有与镜像端口挂接。
项目复制到镜像内，项目访问端口是3306.
容器启动后，项目是访问的容器的mysql还是物理机的mysql
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这取决于访问的主机名或IP地址，如果通过mysql容器的服务名称访问，访问就是mysql容器