mysql time over_mysql启动失败错误mysqld.service holdoff time over, scheduling restart.

由于搭建主从分布式mysql环境，在搭建前，对之前的mysql残留环境彻底清除。清除命令如下：

#yum remove mysql* mariadb* -y

#rm /etc/my.cnf

#rm -rf /var/lib/mysql

#rm -rf /usr/share/mysql

#rm -rf /usr/lib/mysql

查询mysql服务

#systemctl list-unit-files | grep mysql

#systemctl disable mysqld.service

#systemctl disable mysql.service

#rm -rf /var/run/mysql/

#rm -rf /etc/mecabrc

#rm -rf /usr/lib/systemd/system/mysqld.service

#rm -rf /etc/systemd/system/mysqld.service

#rm -rf /etc/systemd/system/mysql.service

清除后，对Mysql配置文件进行配置后，加入了日志参数，大致如下：

datadir=/var/lib/mysql

socket=/var/lib/mysql/mysql.sock

user=mysql

read_only=on

log_bin=mysql-bin

log-slave-updates

server-id=162

binlog_format=row

重启mysql，发现一直启动失败。查看日志，并没有具体的ERROR日志，只是启动不了。因为以前部署主从，都是按照这种方式来部署的，所以不存在是配置文件的问题。但我将所有主从配置去掉后，重启mysql后又能正常启动。于是我一条条定位添加的配置，发现错误出现在：log_bin=mysql-bin这个参数上，只要去掉它就能启动成功。想配置主从，这个参数是必须要添加的，所以只能再次查看日志/var/log/mysqld.log和/var/log/messages，发现报错：

Oct 26 10:01:19 lf-319-162 systemd: Failed to start MySQL Server.

Oct 26 10:01:19 lf-319-162 systemd: Unit mysqld.service entered failed state.

Oct 26 10:01:19 lf-319-162 systemd: mysqld.service failed.

Oct 26 10:01:20 lf-319-162 systemd: mysqld.service holdoff time over, scheduling restart.

Oct 26 10:01:20 lf-319-162 systemd: Starting MySQL Server...

Oct 26 10:01:20 lf-319-162 mysqld: Initialization of mysqld failed: 0

Oct 26 10:01:20 lf-319-162 systemd: mysqld.service: control process exited, code=exited status=1

Oct 26 10:01:22 lf-319-162 systemd: Failed to start MySQL Server.

百度后发现，只需要重启服务器就能完成，原因是：无法重新加载配置文件

最后reboot重启服务器，发现问题解决啦！！

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mysql time over_mysql启动失败错误mysqld.service holdoff time over, scheduling restart.

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