MySQL启动报错问题InnoDB:Unable to lock/ibdata1 error

在OS X环境下MySQL启动时报错：

016-03-03T00:02:30.483037Z 0 [ERROR] InnoDB: Unable to lock ./ibdata1 error: 352016-03-03T00:02:30.483100Z 0 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.

ps -ef |grep mysqld74 7711 1 0 8:04上午 ?? 0:00.34 /usr/local/mysql/bin/mysqld --user=_mysql --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --plugin-dir=/usr/local/mysql/lib/plugin --log-error=/usr/local/mysql/data/mysqld.local.err --pid-file=/usr/local/mysql/data/mysqld.local.pid

sudo kill -9 7711

ps -ef |grep mysqld74 7759 1 0 8:10上午 ?? 0:00.29 /usr/local/mysql/bin/mysqld --user=_mysql --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --plugin-dir=/usr/local/mysql/lib/plugin --log-error=/usr/local/mysql/data/mysqld.local.err --pid-file=/usr/local/mysql/data/mysqld.local.pid

lsof -c mysqld

Mac OS X, lsof only shows your own processes unless running as root with sudo

于是再次运行：

sudo lsof -c mysqldCOMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAMEmysqld 8655 _mysql cwd DIR 1,4 544 3090250 /usr/local/mysql/datamysqld 8655 _mysql txt REG 1,4 31130736 3089789 /usr/local/mysql/bin/mysqld

sudo launchctl unload -w /Library/LaunchDaemons/com.oracle.oss.mysql.mysqld.plist

ps -ef |grep mysqld

sudo launchctl load -w /Library/LaunchDaemons/com.oracle.oss.mysql.mysqld.plist

LAUNCHD是什么？

launchd是Mac OS X从10.4开始引入，用于用于初始化系统环境的关键进程，它是内核装载成功之后在OS环境下启动的第一个进程。传统的Linux会使用/etc/rc.*或者/etc/init来管理开机要启动的服务，而在OS X中就是使用launchd来管理。采用这种方式来配置启动项很简单，只需要一个plist文件。/Library/LaunchDaemons目录下的plist文件都是系统启动后立即启动进程。使用launchctl命令加载/卸载plist文件，加载配置文件后，程序启动，卸载配置文件后程序关闭。

卸载配置文件后又尝试直接用mysqld命令来启动mysql进程试试：

/usr/local/mysql/bin/mysqld2016-03-03T01:35:50.359258Z 0 [ERROR] InnoDB: ./ib_logfile0 can't be opened in read-write mode.2016-03-03T01:35:50.359283Z 0 [ERROR] InnoDB: Plugin initialization aborted with error Generic error2016-03-03T01:35:50.670517Z 0 [ERROR] Plugin 'InnoDB' init function returned error.2016-03-03T01:35:50.670555Z 0 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.2016-03-03T01:35:50.670568Z 0 [ERROR] Failed to initialize plugins.2016-03-03T01:35:50.670574Z 0 [ERROR] Aborting

2016-03-03T01:38:10.977313Z 0 [ERROR] Fatal error: Please read "Security" section of the manual to find out how to run mysqld as root!2016-03-03T01:38:10.977339Z 0 [ERROR] Aborting2016-03-03T01:38:10.977350Z 0 [Note] Binlog end2016-03-03T01:38:10.977410Z 0 [Note] /usr/local/mysql/bin/mysqld: Shutdown complete

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