mysql 日志滚动

张映 发表于 2012-06-25

分类目录: mysql

标签:,

日志滚动解决日志文件过大问题,比如我开启了general_log,这个日志呢是记录mysql服务器上面所运行的所有sql语句;比如我开启了mysql的慢查询。

1,查看一开log情况

mysql> show global variables like '%log%';
+---------------------------------+---------------------------------+
| Variable_name                   | Value                           |
+---------------------------------+---------------------------------+
| back_log                        | 50                              |
| binlog_cache_size               | 32768                           |
| binlog_format                   | MIXED                           |
| expire_logs_days                | 0                               |
| general_log                     | ON                              |
| general_log_file                | /usr/local/mysql/mysql.log      |
| log                             | ON                              |
| log_bin                         | ON                              |
| log_bin_trust_function_creators | OFF                             |
| log_bin_trust_routine_creators  | OFF                             |
| log_error                       | /var/log/mysqld.log             |
| log_output                      | FILE                            |
| log_queries_not_using_indexes   | OFF                             |
| log_slave_updates               | OFF                             |
| log_slow_queries                | ON                              |
| log_warnings                    | 1                               |
| max_binlog_cache_size           | 4294963200                      |
| max_binlog_size                 | 1073741824                      |
| max_relay_log_size              | 0                               |
| relay_log                       |                                 |
| relay_log_index                 |                                 |
| relay_log_info_file             | relay-log.info                  |
| relay_log_purge                 | ON                              |
| relay_log_space_limit           | 0                               |
| slow_query_log                  | ON                              |
| slow_query_log_file             | /usr/local/mysql/mysql-slow.log |
| sql_log_bin                     | ON                              |
| sql_log_off                     | OFF                             |
| sql_log_update                  | ON                              |
| sync_binlog                     | 0                               |
+---------------------------------+---------------------------------+
30 rows in set (0.00 sec)

上面主要有三个日志文件,mysql.log,mysqd.log,mysql-slow.log,除了mysqld.log不能通过mysqladmin flush-logs来刷新日志外,其他的都可以,mysqld.log是服务器启动程序mysqld产生的。

2,生成日志刷新用户

mysql> GRANT RELOAD ON *.* TO 'log'@'localhost' IDENTIFIED BY 'log';
Query OK, 0 rows affected (0.07 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.03 sec)

用root账户登录进去,添加一个log的用户。分开清楚一点。

3,日志滚动脚本,只保留一个星期的日志

[root@linux ~]# vim log.sh   //添加以下内容

#!/bin/sh
# log refresh 

if [ -f $1 ];
then
    echo "refresh ok" 1>&2
else
    echo "log file do not exist;"
    exit 1
fi

LOG=$1
DB_USER="log"
DB_PASS="log"                                                                                                       

# Others vars
DATE=`date +%w`                                        

BIN_DIR="/usr/local/mysql/bin"

mv ${LOG} ${LOG}_${DATE}

${BIN_DIR}/mysqladmin  -ulog -plog flush-logs

添加可执行权限chmod +x log.sh

脚本很简单,不过有一点要解释一下,就是mv ${LOG} ${LOG}_${DATE},第一周会产生7个文件,第二周会覆盖上周的,星期一覆盖星期一,星期二覆盖星期二,以此内推。

4,日志滚动

[root@linux ~]# ./log.sh /usr/local/mysql/mysql.log
refresh ok
[root@linux ~]# ls /usr/local/mysql/ |grep mysql
mysql.log
mysql.log_1


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作者:海底苍鹰
地址:http://blog.51yip.com/mysql/1419.html

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