以下爲自己線上服務器my.cnf的配置，大家可以參考一下：
服務器配置：ubuntu 8核 8G內存
mysql版本: mysql-5.5
[client]
default-character-set=utf8
port = 3306
socket = /var/run/mysqld/mysqld.sock
[mysqld_safe]
socket = /var/run/mysqld/mysqld.sock
nice = 0
[mysqld]
character-set-server=utf8
init_connect='SET NAMES utf8'
max_connections=1500
max_connect_errors = 6000
#wait_timeout=31536000
#interactive_timeout=31536000
wait_timeout=300
interactive_timeout=300
skip-external-locking
skip-name-resolve
skip-host-cache
log-slow-queries=/var/lib/mysql/slowquery.log
long_query_time=2
thread_concurrency = 16
concurrent_insert = 2
innodb_additional_mem_pool_size = 16M
innodb_buffer_pool_size = 4G
innodb_data_file_path = ibdata1:1G:autoextend
innodb_log_buffer_size = 16M
innodb_log_file_size = 128M
innodb_log_files_in_group = 2
innodb_lock_wait_timeout=120
innodb_thread_concurrency = 16
innodb_file_io_threads = 4
innodb_flush_log_at_trx_commit = 2
innodb_log_files_in_group = 3
innodb_max_dirty_pages_pct = 90
innodb_file_per_table = 0
transaction_isolation = READ-COMMITTED
back_log = 600
open_files_limit = 10240
table_cache = 614
max_heap_table_size = 256M
tmp_table_size = 256M
sort_buffer_size = 2M
join_buffer_size = 2M
read_buffer_size = 1M
read_rnd_buffer_size = 16M
bulk_insert_buffer_size = 64M
key_buffer_size = 128M
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
max_allowed_packet = 32M
thread_stack = 192K
thread_cache_size = 300
myisam-recover = BACKUP
query_cache_limit = 4M
query_cache_min_res_unit = 2k
#query_cache_size = 64M
query_cache_size = 0M
log_error = /var/log/mysql/error.log
binlog_cache_size = 4M
max_binlog_cache_size = 8M
expire_logs_days = 7
max_binlog_size = 200M
[mysqldump]
quick
quote-names
max_allowed_packet = 32M
[mysql]
[isamchk]
key_buffer = 16M
!includedir /etc/mysql/conf.d/