对操作系统重新安装后，无法启动mysql。运行status查看出现下面的错误 1 2 3 4 5 6 7 8 9 # systemctl status mysqld.service mysqld.service - mysql database server loaded: loaded (/lib/systemd/system/mysqld.service; enabled) active: failed since
对操作系统重新安装后，无法启动mysql。运行status查看出现下面的错误
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# systemctl status mysqld.service
mysqld.service - mysql database server
      loaded: loaded (/lib/systemd/system/mysqld.service; enabled)
      active: failed since tue, 15 nov 2011 10:55:37 +0000; 17s ago
     process: 1433 execstartpost=/usr/libexec/mysqld-wait-ready $mainpid (code=exited, status=0/success)
     process: 9490 execstart=/usr/bin/mysqld_safe --nowatch --basedir=/usr (code=exited, status=127)
     process: 9474 execstartpre=/usr/libexec/mysqld-prepare-db-dir (code=exited, status=0/success)
    main pid: 1430 (code=exited, status=0/success)
      cgroup: name=systemd:/system/mysqld.service
原因是：mysql版本比原来的版本低。
安装remi repo库，
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rpm -uvh http://rpms.famillecollet.com/remi-release-17.rpm
yum --enablerepo=remi update mysql mysql-server -y
systemctl start mysqld.service
http://netstu.5iunix.net/archives/201206-473/