在Centos 7中,mysqld.service的作业失败了

操作系统:Centos 7 Linux 3.10.0-229.el7.x86_64

MySQL:mysql57-community-release-el7-7.noarch.rpm

我安装了MySQL服务器yum.当我运行时,systemctl start mysqld我得到以下错误

mysqld.service的工作失败了.有关详细信息,请参阅'systemctl status mysqld.service'和'journalctl -xn'.

systemctl status mysqld.service

MySQL Server Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled) 
Active: failed (Result: start-limit) since Sun 2015-12-06 03:14:54 GMT;
4min 7s ago Process: 6992 ExecStart=/usr/sbin/mysqld
--daemonize $MYSQLD_OPTS (code=exited, status=1/FAILURE) Process: 6971 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited,
status=0/SUCCESS) 
Dec 06 03:14:54 localhost.localdomain systemd[1]: mysqld.service: control process exited, code=exited status=1 
Dec 06 03:14:54 localhost.localdomain systemd[1]: Failed to start MySQL Server. 
Dec 06 03:14:54 localhost.localdomain systemd[1]: Unit  mysqld.service entered failed state. 
Dec 06 03:14:54 localhost.localdomain systemd[1]: mysqld.service holdoff time over, scheduling restart. 
Dec 06 03:14:54 localhost.localdomain systemd[1]: Stopping MySQL Server... 
Dec 06 03:14:54 localhost.localdomain systemd[1]: Starting MySQL Server...   
Dec 06 03:14:54 localhost.localdomain systemd[1]: mysqld.service start request repeated too quickly, refusing to start. 
Dec 06 03:14:54 localhost.localdomain systemd[1]: Failed to start MySQL Server. 
Dec 06 03:14:54 localhost.localdomain systemd[1]: Unit mysqld.service entered failed state. The journal command reads Failed to start MySQL Server

还有什么想法我还应该关注什么？

检查以下内容以解决问题

使用以下命令检查mysql数据目录的权限.所有权应为mysql:mysql,目录权限应为700

#LS -ld的/ var/lib中/ MySQL的/

使用以下命令检查mysql data dir中数据库的权限.对于该目录中的所有文件,所有权应该是mysql:mysql

#LS -lh在/ var/lib中/ MySQL的/

使用以下命令检查侦听网络tcp端口

#netstat的-ntlp

使用以下命令检查mysql日志文件是否有任何错误.

#猫/var/log/mysql/mysqld.log

尝试使用以下命令启动mysql

#mysqld_safe的--defaults文件=的/ etc/my.cf