正在从apahce换入nginx，以为是nginx配置问题，结果换回apache故障依旧。
想到动过数据库配置文件，my.cnf，检查后发现
有一句
log-gin = mysql-bin
注释掉就可以。
在 max_allowed_packet上折磨很久（官网上的提示）
贴个备份mycnf文件
# Example MySQL config file for very large systems.
#
# This is for a large system with memory of 1G-2G where the system runs mainly
# MySQL.
#
# 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]
#password = your_password
port = 3306
socket=/var/lib/mysql/mysql.sock# Here follows entries for some specific programs# The MySQL server
[mysqld]
port = 3306
datadir=/mnt/db1/mysql/data
socket=/var/lib/mysql/mysql.sock
#max_connections=5000
#max_connect_errors=6000
skip-external-locking
key_buffer_size = 384M
max_allowed_packet = 512M
table_open_cache = 512
sort_buffer_size = 2M
read_buffer_size = 2M
read_rnd_buffer_size = 8M
myisam_sort_buffer_size = 64M
thread_cache_size = 16
query_cache_size = 32M
tmp_table_size = 8M
#open_files_limit = 10240
#table_cache = 640
#myself
#open_tables = 1000
#
# Try number of CPU's*2 for thread_concurrency
thread_concurrency = 8# 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# 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# Replication Slave (comment out master section to use this)
#
# To configure this host as a replication slave, you can choose between
# two methods :
#
# 1) Use the CHANGE MASTER TO command (fully described in our manual) -
# the syntax is:
#
# CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>,
# MASTER_USER=<user>, MASTER_PASSWORD=<password> ;
#
# where you replace <host>, <user>, <password> by quoted strings and
# <port> by the master's port number (3306 by default).
#
# Example:
#
# CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306,
# MASTER_USER='joe', MASTER_PASSWORD='secret';
#
# OR
#
# 2) Set the variables below. However, in case you choose this method, then
# start replication for the first time (even unsuccessfully, for example
# if you mistyped the password in master-password and the slave fails to
# connect), the slave will create a master.info file, and any later
# change in this file to the variables' values below will be ignored and
# overridden by the content of the master.info file, unless you shutdown
# the slave server, delete master.info and restart the slaver server.
# For that reason, you may want to leave the lines below untouched
# (commented) and instead use CHANGE MASTER TO (see above)
#
# required unique id between 2 and 2^32 - 1
# (and different from the master)
# defaults to 2 if master-host is set
# but will not function as a slave if omitted
#server-id = 2
#
# The replication master for this slave - required
#master-host = <hostname>
#
# The username the slave will use for authentication when connecting
# to the master - required
#master-user = <username>
#
# The password the slave will authenticate with when connecting to
# the master - required
#master-password = <password>
#
# The port the master is listening on.
# optional - defaults to 3306
#master-port = <port>
#
# binary logging - not required for slaves, but recommended
#log-bin = mysql-bin
#
# binary logging format - mixed recommended
#binlog_format=mixed# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = /mnt/db1/mysql/data
#innodb_data_file_path = ibdata1:2000M;ibdata2:10M:autoextend
#innodb_log_group_home_dir = /mnt/db1/mysql/data
# You can set .._buffer_pool_size up to 50 - 80 %
# of RAM but beware of setting memory usage too high
innodb_buffer_pool_size = 2048M
innodb_additional_mem_pool_size = 120M
# Set .._log_file_size to 25 % of buffer pool size
innodb_log_file_size = 100M
innodb_log_buffer_size = 8M
innodb_flush_log_at_trx_commit = 1
innodb_lock_wait_timeout = 60
innodb_open_files = 6000
innodb_file_io_threads = 4
innodb_max_dirty_pages_pct = 90
innodb_lock_wait_timeout = 120
innodb_file_per_table = 0[mysqldump]
#quick
#max_allowed_packet = 512M[mysql]
#no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates[myisamchk]
#key_buffer_size = 256M
#sort_buffer_size = 256M
#read_buffer = 2M
#write_buffer = 2M[mysqlhotcopy]
#interactive-timeout