系统根目录可用空间低于20%，清理mysqlbinarylogs日志空间

[root@node-1 lib]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/os-root   138G   99G   32G  76% /
tmpfs                  16G   22M   16G   1% /dev/shm
/dev/sda3             194M   28M  156M  16% /boot
/dev/mapper/mongo-mongodb
                      121G   32G   84G  28% /var/lib/mongo
[root@node-1 lib]# cd /var/lib/
[root@node-1 lib]# du -sh ./*
24K     ./alternatives
52K     ./astute
8.0K    ./authconfig
16K     ./ceilometer
313M    ./ceph
8.0K    ./cinder
8.0K    ./corosync
4.0K    ./dav
8.0K    ./dbus
4.0K    ./dhclient
4.0K    ./dnsmasq
4.0K    ./games
186M    ./ganglia
2.1G    ./glance
4.0K    ./haproxy
4.0K    ./heat
4.0K    ./hiera
28K     ./iscsi
8.0K    ./keystone
4.0K    ./libvirt
8.0K    ./logrotate.status
4.0K    ./misc
2.7M    ./mlocate
32G     ./mongo
4.0K    ./mongodb
24G     ./mysql
4.0K    ./net-snmp
328K    ./neutron
28K     ./nfs
92K     ./nova
8.0K    ./ntp
4.0K    ./openstack-dashboard
8.0K    ./openvswitch
37M     ./pacemaker
8.0K    ./php
8.0K    ./plymouth
28K     ./polkit-1
8.0K    ./postfix
2.6M    ./puppet
448K    ./rabbitmq
4.0K    ./random-seed
43M     ./rpm
4.0K    ./rsyslog
16K     ./samba
12K     ./stateless
4.0K    ./swift
8.0K    ./udev
12M     ./yum
[root@node-1 lib]# mysql
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 561143
Server version: 5.6.16-log MySQL Community Server (GPL), wsrep_25.5.rXXXX
Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show binary logs
    -> ;
+------------------+------------+
| Log_name         | File_size  |
+------------------+------------+
| mysql-bin.000001 |      65309 |
| mysql-bin.000002 |    1050551 |
| mysql-bin.000003 |        143 |
| mysql-bin.000004 |    3540294 |
| mysql-bin.000005 |        143 |
| mysql-bin.000006 |    3003498 |
| mysql-bin.000007 |        143 |
| mysql-bin.000008 |    1860503 |
| mysql-bin.000009 |        143 |
| mysql-bin.000010 |      44957 |
| mysql-bin.000011 |        143 |
| mysql-bin.000012 |       3382 |
| mysql-bin.000013 |        143 |
| mysql-bin.000014 |   79842271 |
| mysql-bin.000015 |        143 |
| mysql-bin.000016 |     546006 |
| mysql-bin.000017 |        143 |
| mysql-bin.000018 | 1073742179 |
| mysql-bin.000019 | 1073742802 |
| mysql-bin.000020 | 1073744465 |
| mysql-bin.000021 | 1073742189 |
| mysql-bin.000022 | 1073742449 |
| mysql-bin.000023 | 1073742099 |
| mysql-bin.000024 | 1073742227 |
| mysql-bin.000025 | 1073742421 |
| mysql-bin.000026 | 1073742434 |
| mysql-bin.000027 | 1073744436 |
| mysql-bin.000028 | 1073741968 |
| mysql-bin.000029 | 1073742232 |
| mysql-bin.000030 | 1073741967 |
| mysql-bin.000031 | 1073742139 |
| mysql-bin.000032 | 1073742557 |
| mysql-bin.000033 | 1073741954 |
| mysql-bin.000034 | 1073741886 |
| mysql-bin.000035 | 1073742119 |
| mysql-bin.000036 |  967440665 |
| mysql-bin.000037 |        143 |
| mysql-bin.000038 | 1073742079 |
| mysql-bin.000039 | 1073742755 |
| mysql-bin.000040 | 1073742013 |
| mysql-bin.000041 | 1073742194 |
| mysql-bin.000042 |  721149061 |
+------------------+------------+
42 rows in set (0.00 sec)
//删除mysql bin-log日志，删除binlog.000038之前的，不包括binlog.000038//
mysql> purge binary logs to 'mysql-bin.000038';
Query OK, 0 rows affected (1.33 sec)
mysql> show binary logs;
+------------------+------------+
| Log_name         | File_size  |
+------------------+------------+
| mysql-bin.000038 | 1073742079 |
| mysql-bin.000039 | 1073742755 |
| mysql-bin.000040 | 1073742013 |
| mysql-bin.000041 | 1073742194 |
| mysql-bin.000042 |  721266404 |
+------------------+------------+
5 rows in set (0.00 sec)
mysql> exit
Bye
[root@node-1 lib]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/os-root   138G   80G   51G  62% /
tmpfs                  16G   22M   16G   1% /dev/shm
/dev/sda3             194M   28M  156M  16% /boot
/dev/mapper/mongo-mongodb
                      121G   32G   84G  28% /var/lib/mongo