python - ec2 のソケット '/var/run/mysqld/mysqld.sock' を介してローカル MySQL サーバーに接続できません

Question

Amazon ec2 インスタンスで mysql を使用していました。データベース テーブルに約 1000 レコードをプッシュし、レコードを選択して更新するマルチスレッド python スクリプトを実行しました。1000 レコードを挿入するたびにスクリプトを実行し、スクリプトが完了したらそれらを削除しました。 1000 レコードと同じことを繰り返しました (どれくらいの時間がかかったかを確認するため)。最初の 2 回は機能しましたが、3 回目には次のようになりまし Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock'た。私のログファイルは次のようになります。

   30702 16:02:36 [Note] Plugin 'FEDERATED' is disabled.
   130702 16:02:36 InnoDB: The InnoDB memory heap is disabled
   130702 16:02:36 InnoDB: Mutexes and rw_locks use GCC atomic builtins
   130702 16:02:36 InnoDB: Compressed tables use zlib 1.2.3.4
   130702 16:02:36 InnoDB: Initializing buffer pool, size = 128.0M

   InnoDB: mmap(137363456 bytes) failed; errno 12
   130702 16:02:36 InnoDB: Completed initialization of buffer pool
   130702 16:02:36 InnoDB: Fatal error: cannot allocate memory for the buffer pool
   130702 16:02:36 [ERROR] Plugin 'InnoDB' init function returned error.
   130702 16:02:36 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
   130702 16:02:36 [ERROR] Unknown/unsupported storage engine: InnoDB
   130702 16:02:36 [ERROR] Aborting

   130702 16:02:36 [Note] /usr/sbin/mysqld: Shutdown complete

   130702 16:02:37 [Note] Plugin 'FEDERATED' is disabled.
   130702 16:02:37 InnoDB: The InnoDB memory heap is disabled
   130702 16:02:37 InnoDB: Mutexes and rw_locks use GCC atomic builtins
   130702 16:02:37 InnoDB: Compressed tables use zlib 1.2.3.4
   130702 16:02:37 InnoDB: Initializing buffer pool, size = 128.0M
   InnoDB: mmap(137363456 bytes) failed; errno 12
   130702 16:02:37 InnoDB: Completed initialization of buffer pool
   130702 16:02:37 InnoDB: Fatal error: cannot allocate memory for the buffer pool
   130702 16:02:37 [ERROR] Plugin 'InnoDB' init function returned error.
   130702 16:02:37 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
   130702 16:02:37 [ERROR] Unknown/unsupported storage engine: InnoDB
   130702 16:02:37 [ERROR] Aborting

   130702 16:02:37 [Note] /usr/sbin/mysqld: Shutdown complete

私のインスタンスのスペース情報は次のとおりです。

Filesystem Size  Used Avail Use% Mounted on
/dev/xvda1      7.9G  1.8G  5.8G  23% /
udev            288M  8.0K  288M   1% /dev
tmpfs           119M  180K  118M   1% /run
none            5.0M     0  5.0M   0% /run/lock
none            296M     0  296M   0% /run/shm

そして、これが私の my.cnf 構成ファイルです。

#
# The MySQL database server configuration file.
#
# You can copy this 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/quote

# 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     = /var/lib/mysql
tmpdir      = /tmp
lc-messages-dir = /usr/share/mysql
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
#
key_buffer      = 16M
max_allowed_packet  = 16M
thread_stack        = 192K
thread_cache_size       = 8
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched
myisam-recover         = BACKUP
#max_connections        = 100
#table_cache            = 64
#thread_concurrency     = 10
#
# * Query Cache Configuration
#
query_cache_limit   = 1M
query_cache_size        = 16M
#
# * 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 log - should be very few entries.
#
log_error = /var/log/mysql/error.log
#
# Here you can see queries with especially long duration
#log_slow_queries   = /var/log/mysql/mysql-slow.log
#long_query_time = 2
#log-queries-not-using-indexes
#
# 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
#log_bin            = /var/log/mysql/mysql-bin.log
expire_logs_days    = 10
max_binlog_size         = 100M
#binlog_do_db       = include_database_name
#binlog_ignore_db   = include_database_name
#
# * 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!
#
# * 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/