【求助】MySQL启动报错，注释掉my.cnf的binlog行后又可以启动，什么原因？
如题，我的my.cnf如下图所示：目前图中的“#log-bin=/usr/local/mysql/data/binlog/mysql-bin”这一行是注释掉的，数据库可以正常启动；
然而将该行注释取消掉后，数据库就无法正常启动了，报错如下：
# service mysqld restart
MySQL server PID file could not be found! [失败]
Starting MySQL.The server quit without updating PID file (/[失败]cal/mysql/data/host11.pid).
# service mysqld start
Starting MySQL.The server quit without updating PID file (/[失败]cal/mysql/data/host11.pid).
查看错误日志：
# tail -n100 /var/log/mysqld.log
2016-07-05 13:48:31 9283 Giving 0 client threads a chance to die gracefully
2016-07-05 13:48:31 9283 Event Scheduler: Purging the queue. 0 events
2016-07-05 13:48:31 9283 Shutting down slave threads
2016-07-05 13:48:31 9283 Forcefully disconnecting 0 remaining clients
2016-07-05 13:48:31 9283 Binlog end
2016-07-05 13:48:31 9283 Shutting down plugin 'partition'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_SYS_DATAFILES'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_SYS_TABLESPACES'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_SYS_FOREIGN_COLS'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_SYS_FOREIGN'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_SYS_FIELDS'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_SYS_COLUMNS'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_SYS_INDEXES'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_SYS_TABLESTATS'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_SYS_TABLES'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_FT_INDEX_TABLE'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_FT_INDEX_CACHE'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_FT_CONFIG'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_FT_BEING_DELETED'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_FT_DELETED'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_FT_DEFAULT_STOPWORD'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_METRICS'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_BUFFER_POOL_STATS'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_BUFFER_PAGE_LRU'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_BUFFER_PAGE'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_CMP_PER_INDEX_RESET'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_CMP_PER_INDEX'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_CMPMEM_RESET'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_CMPMEM'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_CMP_RESET'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_CMP'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_LOCK_WAITS'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_LOCKS'
2016-07-05 13:48:31 9283 Shutting down plugin 'INNODB_TRX'
2016-07-05 13:48:31 9283 Shutting down plugin 'InnoDB'
2016-07-05 13:48:31 9283 InnoDB: FTS optimize thread exiting.
2016-07-05 13:48:31 9283 InnoDB: Starting shutdown...
2016-07-05 13:48:32 9283 InnoDB: Shutdown completed; log sequence number 1977376
2016-07-05 13:48:32 9283 Shutting down plugin 'PERFORMANCE_SCHEMA'
2016-07-05 13:48:32 9283 Shutting down plugin 'BLACKHOLE'
2016-07-05 13:48:32 9283 Shutting down plugin 'ARCHIVE'
2016-07-05 13:48:32 9283 Shutting down plugin 'MRG_MYISAM'
2016-07-05 13:48:32 9283 Shutting down plugin 'MEMORY'
2016-07-05 13:48:32 9283 Shutting down plugin 'CSV'
2016-07-05 13:48:32 9283 Shutting down plugin 'MyISAM'
2016-07-05 13:48:32 9283 Shutting down plugin 'sha256_password'
2016-07-05 13:48:32 9283 Shutting down plugin 'mysql_old_password'
2016-07-05 13:48:32 9283 Shutting down plugin 'mysql_native_password'
2016-07-05 13:48:32 9283 Shutting down plugin 'binlog'
2016-07-05 13:48:32 9283 /usr/local/mysql/bin/mysqld: Shutdown complete
160705 13:48:32 mysqld_safe mysqld from pid file /usr/local/mysql/data/host11.pid ended
160705 13:48:34 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/data
2016-07-05 13:48:34 0 TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
/usr/local/mysql/bin/mysqld: File '/usr/local/mysql/data/binlog/mysql-bin.index' not found (Errcode: 2 - No such file or directory)
2016-07-05 13:48:34 9615 Aborting
2016-07-05 13:48:34 9615 Binlog end
2016-07-05 13:48:34 9615 /usr/local/mysql/bin/mysqld: Shutdown complete
160705 13:48:34 mysqld_safe mysqld from pid file /usr/local/mysql/data/host11.pid ended
160705 13:49:42 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/data
2016-07-05 13:49:42 0 TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
/usr/local/mysql/bin/mysqld: File '/usr/local/mysql/data/binlog/mysql-bin.index' not found (Errcode: 2 - No such file or directory)
2016-07-05 13:49:42 9924 Aborting
2016-07-05 13:49:42 9924 Binlog end
2016-07-05 13:49:42 9924 /usr/local/mysql/bin/mysqld: Shutdown complete
160705 13:49:42 mysqld_safe mysqld from pid file /usr/local/mysql/data/host11.pid ended
160705 13:49:53 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/data
2016-07-05 13:49:53 0 TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
/usr/local/mysql/bin/mysqld: File '/usr/local/mysql/data/binlog/mysql-bin.index' not found (Errcode: 2 - No such file or directory)
2016-07-05 13:49:53 10192 Aborting
2016-07-05 13:49:53 10192 Binlog end
2016-07-05 13:49:53 10192 /usr/local/mysql/bin/mysqld: Shutdown complete
160705 13:49:53 mysqld_safe mysqld from pid file /usr/local/mysql/data/host11.pid ended
160705 13:50:28 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/data
2016-07-05 13:50:28 0 TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2016-07-05 13:50:28 10460 Plugin 'FEDERATED' is disabled.
2016-07-05 13:50:28 10460 InnoDB: The InnoDB memory heap is disabled
2016-07-05 13:50:28 10460 InnoDB: Mutexes and rw_locks use GCC atomic builtins
2016-07-05 13:50:28 10460 InnoDB: Compressed tables use zlib 1.2.3
2016-07-05 13:50:28 10460 InnoDB: Using CPU crc32 instructions
2016-07-05 13:50:28 10460 InnoDB: Initializing buffer pool, size = 128.0M
2016-07-05 13:50:29 10460 InnoDB: Completed initialization of buffer pool
2016-07-05 13:50:29 10460 InnoDB: Highest supported file format is Barracuda.
2016-07-05 13:50:29 10460 InnoDB: 128 rollback segment(s) are active.
2016-07-05 13:50:29 10460 InnoDB: Waiting for purge to start
2016-07-05 13:50:29 10460 InnoDB: 5.6.11 started; log sequence number 1977376
2016-07-05 13:50:29 10460 Server hostname (bind-address): '*'; port: 3306
2016-07-05 13:50:29 10460 IPv6 is available.
2016-07-05 13:50:29 10460 - '::' resolves to '::';
2016-07-05 13:50:29 10460 Server socket created on IP: '::'.
2016-07-05 13:50:29 10460 Event Scheduler: Loaded 0 events
2016-07-05 13:50:29 10460 /usr/local/mysql/bin/mysqld: ready for connections.
Version: '5.6.11'socket: '/var/lib/mysql/mysql.sock'port: 3306Source distribution
没有发现什么有用的信息。
劳烦哪位高人帮忙指点下，是什么原因？谢谢！ Initializing buffer pool, size = 128.0M
buffer pool太少了
你先touch一个pid文件出来
/[失败]cal/mysql/data/host11.pid) 回复 2# lyhabc
我明白是什么原因了。
在于my.cnf里面配置得binlog目录，当前没有这个目录，所以报错。
mkdir -p 这个目录，并且修改权限为mysql:mysql之后才可以。
之前实验过touch pid，是不行的。根本原因是因为没有那个binlog的目录。错误日志里面其实提示得很清楚。
你好楼主我也是这个问题，请问这个问题您解决了吗？ 解决了的话希望可以给我提供一点有用的建议：联系qq：673013521
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