Wednesday, January 25, 2017

How to clear old mysql bin log files in mysql 5.7

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We have seen how to do mysql master slave replication in one of our previous post. Once we setup mysql server as master with traditional replication, it will start creating bin-logs. This will go on and on, depending on the transactions happening on you database it may eat all your storage space.

One day I checked the disk usage of one of our mysql instance and found that 82% of disk is utilized!

[root@mysql mysql]# df -hT
Filesystem           Type   Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
                            ext4    50G   39G  8.6G  82% /
tmpfs                   tmpfs  3.0G     0  3.0G   0% /dev/shm
/dev/xvda1           ext4   477M   55M  398M  12% /boot
/dev/mapper/VolGroup-lv_home
                           ext4    94G  642M   89G   1% /home

You can check in you master mysql console which is the current bin-log file.
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000089 |    25682 |              | mysql            |                   |
+------------------+----------+--------------+------------------+-------------------+

Then I checked the size of /var/lib/mysql and found a lot of bin-log files. When I checked the master status I found that the current bin file is mysql-bin.000089. So I can delete the files till that. Or the files till the last week.

And you can delete all the old bin-log files upto the latest one

mysql> PURGE BINARY LOGS TO 'mysql-bin.000075';
Query OK, 0 rows affected (0.91 sec)

You can actually automate this. You need to specify the expire log days variable in my.cnf of the master mysql server.

for example.
vim /etc/my.cnf
under [mysqld] add
expire_logs_days=7

Restart the mysql service and you are done.
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