centos7做为Docker基础镜像须知

centos7基础镜像Dockerfile来构建mysql镜像可能会有问题，在Docker hub上构建失败： Build failed: The command '/bin/sh -c /etc/init.d/mysqld start && mysql -e "grant all privileges on *.* to 'root'@'%' identified by '123456' WIT

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