centos7 安装mysql 解决 Failed to start mariadb.service: Unit not found.

涉及好多个错误。一环套一环的。 首先安装问题 首先需要安装mariadb-server systemctl start mariadb.service 会报错：Failed to start mariadb.service: Unit not found. yum install mariadb 然后使用命令systemctl start mariadb，提示如下： Failed to start

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