Ubuntu WebServer磁盘空间突然增加

我们有一个iWstack云服务，主空间100GB和20GB Side Storge。

NewRelic总是告诉我主空间已经满了。

我检查使用这个空间是什么：

sudo du -a /var/www | sort -n

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但一切看起来很健康。

然后我开始全面冲洗caching。

并注意到，当我这样做时：

RESET QUERY CACHE; RESET MASTER;

并重新启动NGINX和PHP5将释放空间。

my.cnf上有什么configuration，我失踪？

UPDATE

my.cnf文件：

 # MariaDB database server configuration file. # # You can copy this file to one of: # - "/etc/mysql/my.cnf" to set global options, # - "~/.my.cnf" to set user-specific options. # # One can use all long options that the program supports. # Run program with --help to get a list of available options and with # --print-defaults to see which it would actually understand and use. # # For explanations see # http://dev.mysql.com/doc/mysql/en/server-system-variables.html # This will be passed to all mysql clients # It has been reported that passwords should be enclosed with ticks/quotes # escpecially if they contain "#" chars... # Remember to edit /etc/mysql/debian.cnf when changing the socket location. [client] port = 3306 socket = /var/run/mysqld/mysqld.sock # Here is entries for some specific programs # The following values assume you have at least 32M ram # This was formally known as [safe_mysqld]. Both versions are currently parsed. [mysqld_safe] socket = /var/run/mysqld/mysqld.sock nice = 0 [mysqld] # # * Basic Settings # user = mysql pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock port = 3306 basedir = /usr datadir = /media/db/mysql tmpdir = /tmp lc_messages_dir = /usr/share/mysql lc_messages = en_US skip-external-locking # # Instead of skip-networking the default is now to listen only on # localhost which is more compatible and is not less secure. bind-address = 127.0.0.1 # # * Fine Tuning # max_connections = 100 connect_timeout = 5 wait_timeout = 600 max_allowed_packet = 16M thread_cache_size = 128 sort_buffer_size = 4M bulk_insert_buffer_size = 16M tmp_table_size = 32M max_heap_table_size = 32M # # * MyISAM # # This replaces the startup script and checks MyISAM tables if needed # the first time they are touched. On error, make copy and try a repair. myisam_recover = BACKUP key_buffer_size = 128M #open-files-limit = 2000 table_open_cache = 400 myisam_sort_buffer_size = 512M concurrent_insert = 2 read_buffer_size = 2M read_rnd_buffer_size = 1M # # * Query Cache Configuration # # Cache only tiny result sets, so we can fit more in the query cache. query_cache_limit = 128K query_cache_size = 64M # for more write intensive setups, set to DEMAND or OFF #query_cache_type = DEMAND # # * Logging and Replication # # Both location gets rotated by the cronjob. # Be aware that this log type is a performance killer. # As of 5.1 you can enable the log at runtime! #general_log_file = /var/log/mysql/mysql.log #general_log = 1 # # Error logging goes to syslog due to /etc/mysql/conf.d/mysqld_safe_syslog.cnf. # # we do want to know about network errors and such log_warnings = 2 # # Enable the slow query log to see queries with especially long duration #slow_query_log[={0|1}] slow_query_log_file = /var/log/mysql/mariadb-slow.log long_query_time = 10 #log_slow_rate_limit = 1000 log_slow_verbosity = query_plan #log-queries-not-using-indexes #log_slow_admin_statements # # The following can be used as easy to replay backup logs or for replication. # note: if you are setting up a replication slave, see README.Debian about # other settings you may need to change. #server-id = 1 #report_host = master1 #auto_increment_increment = 2 #auto_increment_offset = 1 log_bin = /var/log/mysql/mariadb-bin log_bin_index = /var/log/mysql/mariadb-bin.index # not fab for performance, but safer #sync_binlog = 1 expire_logs_days = 10 max_binlog_size = 100M # slaves #relay_log = /var/log/mysql/relay-bin #relay_log_index = /var/log/mysql/relay-bin.index #relay_log_info_file = /var/log/mysql/relay-bin.info #log_slave_updates #read_only # # If applications support it, this stricter sql_mode prevents some # mistakes like inserting invalid dates etc. #sql_mode = NO_ENGINE_SUBSTITUTION,TRADITIONAL # # * InnoDB # # InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/. # Read the manual for more InnoDB related options. There are many! default_storage_engine = InnoDB # you can't just change log file size, requires special procedure #innodb_log_file_size = 50M innodb_buffer_pool_size = 256M innodb_log_buffer_size = 8M innodb_file_per_table = 1 innodb_open_files = 400 innodb_io_capacity = 400 innodb_flush_method = O_DIRECT # # * Security Features # # Read the manual, too, if you want chroot! # chroot = /var/lib/mysql/ # # For generating SSL certificates I recommend the OpenSSL GUI "tinyca". # # ssl-ca=/etc/mysql/cacert.pem # ssl-cert=/etc/mysql/server-cert.pem # ssl-key=/etc/mysql/server-key.pem [mysqldump] quick quote-names max_allowed_packet = 16M [mysql] #no-auto-rehash # faster start of mysql but no tab completition [isamchk] key_buffer = 16M # # * IMPORTANT: Additional settings that can override those from this file! # The files must end with '.cnf', otherwise they'll be ignored. # !includedir /etc/mysql/conf.d/