阿里云安装mysql启动报错_为什么mysqld启动报错-阿里云开发者社区

Dear 丶 2023-01-12 07:59 224阅读 0赞

在一台ubuntu测试机器上启动一个mysql实例，本来应该是一件很简单的事情，

启动的时候却报错了：

mysqld\_safe --defaults-file=/etc/mysql/my3307.cnf

160218 15:45:13 mysqld\_safe Can't log to error log and syslog at the same time. Remove all --log-error configuration options for --syslog to take effect.

160218 15:45:13 mysqld\_safe Logging to '/var/log/mysql/error3307.log'.

160218 15:45:13 mysqld\_safe Starting mysqld daemon with databases from /var/lib/mysql3307

160218 15:45:15 mysqld\_safe mysqld from pid file /var/run/mysqld/mysqld3307.pid ended

查看错误日志/var/log/mysql/error3307.log

发现是由于权限问题无法创建ibdata文件：

160218 12:19:09 InnoDB: Completed initialization of buffer pool

160218 12:19:09 InnoDB: Operating system error number 13 in a file operation.

InnoDB: The error means mysqld does not have the access rights to

InnoDB: the directory.

InnoDB: File name ./ibdata1

InnoDB: File operation call: 'create'.

InnoDB: Cannot continue operation.

查看目录，理论上应该有读写权限的啊：

ls -ld /var/lib/mysql3307

drwx------ 4 mysql mysql 4096 Feb 18 15:09 /var/lib/mysql3307

难道还有其它什么权限限制？

用dmesg看一下，确实有一些报错，

\[4489099.208660\] type=1400 audit(1455768562.142:57): apparmor="DENIED" operation="mknod" profile="/usr/sbin/mysqld" name="/var/lib/mysql3307/ibdata1" pid=19775 comm="mysqld" requested\_mask="c" denied\_mask="c" fsuid=105 ouid=105

查看/usr/sbin/mysqld的配置：

vi /etc/apparmor.d/usr.sbin.mysqld

增加mysql3307目录的权限，重启apparmor：

/var/lib/mysql3307/ r,

/var/lib/mysql3307/\*\* rwk,

/etc/init.d/apparmor restart

再次重新启动mysqld，发现还是报错，不过这次报错的信息不一样了：

160218 12:44:03 \[ERROR\] Can't start server : Bind on unix socket: Permission denied

160218 12:44:03 \[ERROR\] Do you already have another mysqld server running on socket: /var/run/mysqld/mysqld3307.sock ?

160218 12:44:03 \[ERROR\] Aborting

dmesg也能看到错误消息：

\[4491181.040673\] type=1400 audit(1455770643.975:99): apparmor="DENIED" operation="mknod" profile="/usr/sbin/mysqld" name="/run/mysqld/mysqld3307.sock" pid=24093 comm="mysqld" requested\_mask="c" denied\_mask="c" fsuid=105 ouid=105

到/etc/apparmor.d/usr.sbin.mysqld增加配置，重启apparmor

/var/run/mysqld/mysqld3307.pid rw,

/var/run/mysqld/mysqld3307.sock w,

/run/mysqld/mysqld3307.pid rw,

/run/mysqld/mysqld3307.sock w,

再次重启mysqld，还是报错，不过这次是新的报错：

160218 12:57:27 \[Note\] Server socket created on IP: '0.0.0.0'.

160218 12:57:27 \[ERROR\] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist

160218 12:57:27 mysqld\_safe mysqld from pid file /var/run/mysqld/mysqld3307.pid ended

跑一下mysql\_install\_db --defaults-file=/etc/mysql/my3307.cnf

这次mysqld终于可以正常启动了：

160218 14:44:59 \[Note\] Server socket created on IP: '0.0.0.0'.