mysql logs scroll
- 2020-06-07 05:27:51
- OfStack
1. Check log
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)
Above, there are mainly three log files mysql. log, mysqd. log, mysql - slow. log, besides mysqld. log cannot pass mysqladmin flush - logs to refresh the logs, other can mysqld. log is mysqld server startup program.
2. Generate log refresh users
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)
Log in with your root account and add 1 log user. One point clear.
3, log scrolling script, only keep the log for 1 week
[root@linux ~]# vim log.sh // Add the following
#!/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
Add executable permissions chmod +x log.sh
The script is simple, but there is one point to explain. mv ${LOG} ${LOG}_${DATE}, week 1 will produce 7 files, week 2 will cover last week's, Week 1 will cover Week 1, week 2 will cover Week 2, and so on.
4. Log scrolling
[root@linux ~]# ./log.sh /usr/local/mysql/mysql.log
refresh ok
[root@linux ~]# ls /usr/local/mysql/ |grep mysql
mysql.log
mysql.log_1