512M内存 MYSQL的my.cnf

每次重装系统，总是被MYSQL搞个半死，这次要存下来，不见得准确，但可以使用，版本5.5.4：

# Example MySQL config file for medium systems.
#
# This is for a system with little memory (32M - 64M) where MySQL plays
# an important part, or systems up to 128M where MySQL is used together with
# other programs (such as a web server)
#
# MySQL programs look for option files in a set of
# locations which depend on the deployment platform.
# You can copy this option file to one of those
# locations. For information about these locations, see:
# http://dev.mysql.com/doc/mysql/en/option-files.html
#
# In this file, you can use all long options that a program supports.
# If you want to know which options a program supports, run the program
# with the "--help" option.

# The following options will be passed to all MySQL clients
[client]
#character-set-server=utf8
#password	= your_password
#host            = localhost
port		= 3306
socket		= /tmp/mysql.sock

# Here follows entries for some specific programs

# The MySQL server
[mysqld]
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
#character-set-server=utf8
tmpdir= /tmp
port		= 3306
socket		= /tmp/mysql.sock
skip-external-locking
log-error=/alidata/log/mysql/error.log
key_buffer_size = 16M
max_allowed_packet = 1M
table_open_cache = 64
sort_buffer_size = 512K
net_buffer_length = 8K
read_buffer_size = 256K
read_rnd_buffer_size = 512K
myisam_sort_buffer_size = 8M

# Don't listen on a TCP/IP port at all. This can be a security enhancement,
# if all processes that need to connect to mysqld run on the same host.
# All interaction with mysqld must be made via Unix sockets or named pipes.
# Note that using this option without enabling named pipes on Windows
# (via the "enable-named-pipe" option) will render mysqld useless!
# 
#skip-networking

# Replication Master Server (default)
# binary logging is required for replication
log-bin=mysql-bin

# binary logging format - mixed recommended
binlog_format=mixed

# required unique id between 1 and 2^32 - 1
# defaults to 1 if master-host is not set
# but will not function as a master if omitted
server-id	= 1

innodb_use_sys_malloc = 1
innodb_change_buffering = all
innodb_file_format_check = 1
innodb_max_dirty_pages_pct = 75

innodb_data_home_dir = /alidata/server/mysql/data/
innodb_data_file_path =  ibdata1:1024M;ibdata2:512M:autoextend
innodb_log_group_home_dir = /alidata/server/mysql/data

innodb_log_buffer_size = 16M
innodb_log_file_size = 64M
innodb_log_files_in_group = 2
innodb_additional_mem_pool_size = 8M
innodb_flush_log_at_trx_commit = 1
#innodb_lock_wait_timeout = 50

innodb_buffer_pool_size = 16M

[mysqldump]
quick
max_allowed_packet = 32M

[mysql]

no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates

[myisamchk]
key_buffer_size = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout
expire_logs_days = 5
max_binlog_size = 1000M

然后，因为内存太小，加点SWAP:

$ sudo dd if=/dev/zero of=/swapfile bs=1M count=1024 #增加1G的SWAP进去
$ sudo mkswap /swapfile
$ sudo swapon /swapfile
$ free

添加这行： /swapfile swap swap defaults 0 0 到 /etc/fstab