service mysqld status 可以看mysqld状态
service mysqld start 可以启动mysql
出现启动错误可以查看/var/log/mysqld.log
如果错误信息如下
131124 00:00:43 mysqld started
131124 0:00:43 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 /var/lib/mysql/innodb/ibdata1
InnoDB: File operation call: 'create'.
InnoDB: Cannot continue operation.
131124 00:00:43 mysqld ended
错误13说明没有权限。使用命令
chmod -R 777 /mysql 没有解决
查看 getenforce 为enforcing
设置
提示一下：这个error number 就是系统的错误号，也是程序里的errorno
附上linux的 错误码信息
errno.00 is: Success 成功
errno.01 is: Operation not permitted 不允许此类操作
errno.02 is: No such file or directory 没有此文件或目录
errno.03 is: No such process 没有此进程
errno.04 is: Interrupted system call 中断系统调用
errno.05 is: Input/output error 输入输出错误
errno.06 is: No such device or address 没有此设备或地址
errno.07 is: Argument list too long 参数过长
errno.08 is: Exec format error 执行格式错误
errno.09 is: Bad file descriptor 无效的文件描述符
errno.10 is: No child processes 不存在子进程
errno.11 is: Resource temporarily unavailable 资源暂时不可用
errno.12 is: Cannot allocate memory 分配内存失败
errno.13 is: Permission denied 权限错误
errno.14 is: Bad address 地址错误
errno.15 is: Block device required 块设备请求
errno.16 is: Device or resource busy 设备或资源忙
errno.17 is: File exists 文件已经存在
errno.18 is: Invalid cross-device link 无效的交叉连接设备
errno.19 is: No such device 没有此设备
errno.20 is: Not a directory 不是一个目录
errno.21 is: Is a directory 是一个目录
errno.22 is: Invalid argument 参数非法
errno.23 is: Too many open files in system 系统打开文件太多
errno.24 is: Too many open files 打开文件太多
errno.25 is: Inappropriate ioctl for device 设备部支持该操作
errno.26 is: Text file busy 文本文件忙
errno.27 is: File too large 文件太大
errno.28 is: No space left on device 设备没有空间，一般为存储设备
errno.29 is: Illegal seek 非法的seek操作
errno.30 is: Read-only file system 只读文件系统
errno.31 is: Too many links 太多连接
errno.32 is: Broken pipe 管道破裂
errno.33 is: Numerical argument out of domain 数值参数超出取值范围
errno.34 is: Numerical result out of range 数值结果超出取值范围
errno.35 is: Resource deadlock avoided 资源死锁
errno.36 is: File name too long 文件名太长
errno.37 is: No locks available 没有可用的锁
errno.38 is: Function not implemented 函数没有执行
errno.39 is: Directory not empty 目录非空
errno.40 is: Too many levels of symbolic links 太多级符号连接
errno.41 is: Unknown error 41 41未知错误
errno.42 is: No message of desired type 不被接受的消息类型
errno.43 is: Identifier removed 标识符已被删除
errno.44 is: Channel number out of range 。。。
errno.45 is: Level 2 not synchronized
errno.46 is: Level 3 halted
errno.47 is: Level 3 reset
errno.48 is: Link number out of range
errno.49 is: Protocol driver not attached
errno.50 is: No CSI structure available
errno.51 is: Level 2 halted
errno.52 is: Invalid exchange
errno.53 is: Invalid request descriptor
errno.54 is: Exchange full
errno.55 is: No anode
errno.56 is: Invalid request code
errno.57 is: Invalid slot
errno.58 is: Unknown error 58
errno.59 is: Bad font file format
errno.60 is: Device not a stream
errno.61 is: No data available
errno.62 is: Timer expired
errno.63 is: Out of streams resources
errno.64 is: Machine is not on the network
errno.65 is: Package not installed
errno.66 is: Object is remote
errno.67 is: Link has been severed
errno.68 is: Advertise error
errno.69 is: Srmount error
errno.70 is: Communication error on send
errno.71 is: Protocol error
errno.72 is: Multihop attempted
errno.73 is: RFS specific error
errno.74 is: Bad message
errno.75 is: Value too large for defined data type
errno.76 is: Name not unique on network
errno.77 is: File descriptor in bad state
errno.78 is: Remote address changed
errno.79 is: Can not access a needed shared library
errno.80 is: Accessing a corrupted shared library
errno.81 is: .lib secion in a.out corrupted
errno.82 is: Attempting to link in too many shared libraries
errno.83 is: Cannot exec a shared library directly
errno.84 is: Invalid or incomplete multibyte or wide character
errno.85 is: Interrupted system call should be restarted
errno.86 is: Streams pipe error
errno.87 is: Too many users
errno.88 is: Socket operation on non-socket
errno.89 is: Destination address required
errno.90 is: Message too long
errno.91 is: Protocol wrong type for socket
errno.92 is: Protocol not available
errno.93 is: Protocol not supported
errno.94 is: Socket type not supported
errno.95 is: Operation not supported
errno.96 is: Protocol family not supported
errno.97 is: Address family not supported by protocol
errno.98 is: Address already in use
errno.99 is: Cannot assign requested address
errno.100 is: Network is down
errno.101 is: Network is unreachable
errno.102 is: Network dropped connection on reset
errno.103 is: Software caused connection abort
errno.104 is: Connection reset by peer
errno.105 is: No buffer space available
errno.106 is: Transport endpoint is already connected
errno.107 is: Transport endpoint is not connected
errno.108 is: Cannot send after transport endpoint shutdown
errno.109 is: Too many references: cannot splice
errno.110 is: Connection timed out
errno.111 is: Connection refused
errno.112 is: Host is down
errno.113 is: No route to host
errno.114 is: Operation already in progress
errno.115 is: Operation now in progress
errno.116 is: Stale NFS file handle
errno.117 is: Structure needs cleaning
errno.118 is: Not a XENIX named type file
errno.119 is: No XENIX semaphores available
errno.120 is: Is a named type file
errno.121 is: Remote I/O error
errno.122 is: Disk quota exceeded
errno.123 is: No medium found
errno.124 is: Wrong medium type
errno.125 is: Operation canceled
errno.126 is: Required key not available
errno.127 is: Key has expired
errno.128 is: Key has been revoked
errno.129 is: Key was rejected by service
errno.130 is: Owner died
errno.131 is: State not recoverable
errno.132 is: Unknown error 132
132-255全是Unknown error
