一.问题的描述
备份程序 执行前滚的时候报错。(-apply-log)
InnoDB: Errornumber 24 means 'Too many open files'.
InnoDB: Some operatingsystem error numbers are described at
InnoDB: http://dev.mysql.com/doc/mysql/en/Operating_System_error_codes.html
InnoDB: File name/home/nice/backup/mysql/var.20121211021656/user_db_20121123/tuser_like_core.ibd
InnoDB: File operationcall: 'open'.
InnoDB: Cannot continueoperation.
innobackup:Error:
二.问题分析
openfiles 开的小了。
mysql的open_file_limit受制于以下几个参数
max_connections、 table_open_cache 、open_files_limit 以及 /etc/security/limits.conf中的配置。
max_connections和 table_open_cache 与open_files_limit 的关系：
max_1 = 10 + max_connections + table_cache * 2;
max_2 = max_connections * 5;
max_3 = max_os_open_files;//操作系统单个进程最大允许打开文件句柄（文件描述符）。
open_files_limit= max( max_1, max_2 ) > max_3 ? max_3 : max ( max_1, max_2);
综合分析发现，open_files_limit | 10240
而目前ibd表已经10800个了。
三.解决问题
1.my.cnf 配置 open_files_limit = 20480
重启mysql 发现没有变化,open_files_limit | 10240。
2.ulimit -a
core file size (blocks, -c) unlimited
data seg size (kbytes, -d) unlimited
file size (blocks, -f) unlimited
pending signals (-i) 1024
max locked memory (kbytes, -l) 32
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 137216
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
3.vi /etc/security/limits.conf,添加
mysql soft nofile 8192
mysql hard nofile 20480
4.经过前三步，重启mysql。
重启mysql 发现,open_files_limit | 20480。
5.修改OS用户配置文件
经过前四步，虽然在mysql中 看open_files_limit | 20480,但ibbackup还是在前滚时报错。报，open_file不够。怀疑 还是没有生效。
ulimit -a
core file size (blocks, -c) unlimited
data seg size (kbytes, -d) unlimited
file size (blocks, -f) unlimited
pending signals (-i) 1024
max locked memory (kbytes, -l) 32
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 137216
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
于是，修改OS用户配置文件
分别查看了.bash_profile 、.bashrc 、/etc/bashrc；
发现，.bash_profile调用 .bashrc ，.bashrc调用 /etc/bashrc
发现，/etc/bashrc 中有
ulimit -S -c unlimited > /dev/null 2>&1
在这一行之后 添加
ulimit -n 20480 >/dev/null 2>&1
6.重启mysql ,执行备份程序，在--apply-log，还是报错，报，open_file不够
InnoDB: Errornumber 24 means 'Too many open files'.
InnoDB: Some operatingsystem error numbers are described at
InnoDB: http://dev.mysql.com/doc/mysql/en/Operating_System_error_codes.html
7.修改innodb_open_files 参数
之前这个参数，设置成500.这次修改到1000.
重启mysql 解决问题
四.关于Operating_System_error_codes.html
Linux System Error Codes
The following tableprovides a list of some common Linux system error codes. For a more completelist, see Linux source code.
|
Number |
Macro |
Description |
|
1 |
EPERM |
Operation not permitted |
|
2 |
ENOENT |
No such file or directory |
|
3 |
ESRCH |
No such process |
|
4 |
EINTR |
Interrupted system call |
|
5 |
EIO |
I/O error |
|
6 |
ENXIO |
No such device or address |
|
7 |
E2BIG |
Arg list too long |
|
8 |
ENOEXEC |
Exec format error |
|
9 |
EBADF |
Bad file number |
|
10 |
ECHILD |
No child processes |
|
11 |
EAGAIN |
Try again |
|
12 |
ENOMEM |
Out of memory |
|
13 |
EACCES |
Permission denied |
|
14 |
EFAULT |
Bad address |
|
15 |
ENOTBLK |
Block device required |
|
16 |
EBUSY |
Device or resource busy |
|
17 |
EEXIST |
File exists |
|
18 |
EXDEV |
Cross-device link |
|
19 |
ENODEV |
No such device |
|
20 |
ENOTDIR |
Not a directory |
|
21 |
EISDIR |
Is a directory |
|
22 |
EINVAL |
Invalid argument |
|
23 |
ENFILE |
File table overflow |
|
24 |
EMFILE |
Too many open files |
|
25 |
ENOTTY |
Inappropriate ioctl for device |
|
26 |
ETXTBSY |
Text file busy |
|
27 |
EFBIG |
File too large |
|
28 |
ENOSPC |
No space left on device |
|
29 |
ESPIPE |
Illegal seek |
|
30 |
EROFS |
Read-only file system |
|
31 |
EMLINK |
Too many links |
声明：本文档可以随意更改，但必须署名原作者
作者：凤凰舞者 qq:578989855