mysql启动时报错：Starting MySQL... ERROR! The server quit without updating PID file (/opt/mysql/data/mysql.pid) 的解决方法

出现问题的可能性

1、可能是/opt/mysql/data/数据目录mysql用户没有权限（修改数据目录的权限）

解决方法：给予权限，执行 "chown -R mysql.mysql /opt/mysql/data" 然后重新启动mysqld

2、可能进程里已经存在mysql进程

解决方法：用命令“ps -ef|grep mysqld”查看是否有mysqld进程，如果有使用“kill -9 进程号”杀死，然后重新启动mysqld！

3、可能是第二次在机器上安装mysql，有残余数据影响了服务的启动。

解决方法：去mysql的二进制日志目录看看，如果存在mysql-binlog.index，就赶快把它删除掉吧

4、mysql在启动时没有指定配置文件时会使用/etc/my.cnf配置文件，请打开这个文件查看在[mysqld]下有没有指定数据目录(datadir)。

解决方法：请在[mysqld]下设置这一行：datadir = /opt/mysql/data

5、skip-federated字段问题

解决方法：检查一下/etc/my.cnf文件中有没有没被注释掉的skip-federated字段，如果有就立即注释掉吧。

6、错误日志目录不存在

解决方法：使用“chown” “chmod”命令赋予mysql所有者及权限

7、selinux惹的祸，如果是centos系统，默认会开启selinux

解决方法：先临时改为警告模式:[[email protected] php]# setenforce 0

然后打开/etc/sysconfig/selinux，把SELINUX=enforcing改为SELINUX=disabled

附加：

经验之谈：

还有一个原因可能是：

查看配置文件/usr/local/mysql/my.cnf里有没有innodb_buffer_pool_size这个参数

innodb_buffer_pool_size：主要作用是缓存innodb表的索引，数据，插入数据时的缓冲；

默认值：128M；

专用mysql服务器设置此值的大小：系统内存的70%-80%最佳。

如果你的系统内存不大，查看这个参数，把它的值设置小一点吧

总结：

在配置文件/etc/my.cnf添加错误日志参数，一切问题都解决

[mysqld_safe]
log-error = /data/mysql/logs/error.log

启动报错时查看日志信息：

#tail -f /data/mysql/logs/error.log

160721 06:12:07 mysqld_safe Starting mysqld daemon with databases from /data/mysql/data
2016-07-21 06:12:10 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2016-07-21 06:12:10 0 [Note] /opt/mysql/bin/mysqld (mysqld 5.6.27-log) starting as process 2290 ...
2016-07-21 06:12:10 2290 [Note] Plugin ‘FEDERATED‘ is disabled.
2016-07-21 06:12:10 2290 [Warning] The option innodb (skip-innodb) is deprecated and will be removed in a future release
2016-07-21 06:12:10 2290 [Note] InnoDB: Using atomics to ref count buffer pool pages
2016-07-21 06:12:10 2290 [Note] InnoDB: The InnoDB memory heap is disabled
2016-07-21 06:12:10 2290 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2016-07-21 06:12:10 2290 [Note] InnoDB: Memory barrier is not used
2016-07-21 06:12:10 2290 [Note] InnoDB: Compressed tables use zlib 1.2.3
2016-07-21 06:12:10 2290 [Note] InnoDB: Using CPU crc32 instructions
2016-07-21 06:12:10 2290 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2016-07-21 06:12:10 2290 [Note] InnoDB: Completed initialization of buffer pool
2016-07-21 06:12:10 2290 [Note] InnoDB: Highest supported file format is Barracuda.
2016-07-21 06:12:11 2290 [Note] InnoDB: 128 rollback segment(s) are active.
2016-07-21 06:12:11 2290 [Note] InnoDB: Waiting for purge to start
2016-07-21 06:12:11 2290 [Note] InnoDB: 5.6.27 started; log sequence number 1625997
2016-07-21 06:12:11 2290 [ERROR] /opt/mysql/bin/mysqld: unknown option ‘--slave_parallel_workers＝3‘
2016-07-21 06:12:11 2290 [ERROR] Aborting
2016-07-21 06:12:11 2290 [Note] Binlog end
2016-07-21 06:12:11 2290 [Note] Shutting down plugin ‘partition‘
2016-07-21 06:12:11 2290 [Note] Shutting down plugin ‘INNODB_SYS_DATAFILES‘
2016-07-21 06:12:11 2290 [Note] Shutting down plugin ‘INNODB_SYS_TABLESPACES‘
2016-07-21 06:12:11 2290 [Note] Shutting down plugin ‘INNODB_SYS_FOREIGN_COLS‘
2016-07-21 06:12:11 2290 [Note] Shutting down plugin ‘INNODB_SYS_FOREIGN‘
2016-07-21 06:12:11 2290 [Note] Shutting down plugin ‘INNODB_SYS_FIELDS‘

　　发现日志输出

2016-07-21 06:12:11 2290 [ERROR] /opt/mysql/bin/mysqld: unknown option ‘--slave_parallel_workers＝3‘
2016-07-21 06:12:11 2290 [ERROR] Aborting

肯定是配置文件里加入了这个错误参数，去掉即可

新加报错：

Starting MySQL.171019 10:11:54 mysqld_safe error: log-error set to ‘/data/tools/mysql/logs/error.log‘, however file don‘t exists. Create writable for user ‘mysql‘.

这是在mysql新版本：5.6.35，5.6.36的一个bug

参考：https://bugs.mysql.com/bug.php?id=84427
解决：

手动创建日志文件：

touch /data/tools/mysql/logs/error.log

chown mysql. /data/tools/mysql/logs/error.log

/etc/init.d/mysqld start

　　转自http://732233048.blog.51cto.com/9323668/1636409，版权归作者所有。

时间： 2024-08-14 08:32:54

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