mysql 5.5中InnoDB作为默认的数据库存储引擎，mysql-5.1升级mysql到mysql-5.5以后，以下程序需要重新编译安装升级：
PHP 5.3.6
cacti spine
pureftp
安装
wget http://dev.mysql.com/get/Downloads/MySQL-5.5/mysql-5.5.12-linux2.6-x86_64.tar.gz/from/http://mysql.ntu.edu.tw/
tar -C /usr/local -xzf mysql-5.5.12-linux2.6-x86_64.tar.gz
cd /usr/local
ln -s mysql-5.5.12-linux2.6-x86_64/ mysql
cd /usr/local/mysql
mkdir -p /usr/local/mysql/etc/
cp support-files/my-huge.cnf etc/my.cnf
sed -i 's/skip-locking/skip-external-locking/' my.cnf
sed -i 's/default-character-set/character-set-server/' my.cnf
sed -i 's/log_slow_queries/slow_query_log/' my.cnf
修改server-id = 1为服务器ip地址最后几位，或者其它数值：
cd /usr/local/mysql/etc/
vim my.cnf
#max_allowed_packet = 1M
server-id = 8108
max_allowed_packet = 64M
max_connections=800
character-set-server=utf8
expire_logs_days = 60
binlog_format=mixed
log-bin=mysql-bin
#read_only=1
#slave-skip-errors=1062,1032,1053
innodb_log_files_in_group=2
#default_table_type = INNODB //unknown variable
innodb_data_home_dir = /opt/data/mysql/
innodb_data_file_path = ibdata1:2000M;ibdata2:2000M;ibdata3:20M:autoextend
innodb_log_group_home_dir = /opt/data/mysql/
# 4G RAM
innodb_buffer_pool_size = 1G
innodb_log_file_size = 256M
innodb_log_buffer_size = 8M
innodb_flush_log_at_trx_commit=0
innodb_thread_concurrency=8
innodb_flush_method=O_DIRECT
# perform
tmp_table_size = 512M
max_heap_table_size=128M
slow_query_log
#log-queries-not-using-indexes
#log-slow-admin-statements
#slow_query_log_file=mysql-slow.log
long_query_time=1
log-error=mysqld.log
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
添加数据库用户
/usr/sbin/groupadd -g 502 mysql
/usr/sbin/useradd -u 502 -g mysql mysql
mkdir -p /opt/data/mysql/
chown mysql.mysql /opt/data/mysql/
cd /usr/local/mysql/
scripts/mysql_install_db --user=mysql
chown -R root .
chown -R mysql data
chgrp -R mysql .
#chmod -R u+rw data
cd /opt/data/mysql/
chown mysql.mysql /opt/data/mysql/
cd /usr/local/mysql/
cp support-files/mysql.server /etc/rc.d/init.d/mysqld
chmod +x /etc/rc.d/init.d/mysqld
/etc/rc.d/init.d/mysqld restart
#/sbin/chkconfig --level 345 mysqld on
#/sbin/chkconfig --del mysqld
/sbin/chkconfig --add mysqld
/sbin/chkconfig --list mysqld
echo "/usr/local/mysql/lib" >> /etc/ld.so.conf
cat /etc/ld.so.conf
ldconfig
mkdir -p /var/lib/mysql/
ln -s /tmp/mysql.sock /var/lib/mysql/mysql.sock
#/usr/local/mysql/bin/mysqld_safe &
mkdir -p /var/run/mysqld/
chown mysql /var/run/mysqld/
#加入mysql到路径
echo pathmunge /usr/local/mysql/bin after > /etc/profile.d/mysql.sh
#执行一下，保证mysql在路径环境变量中
. /etc/profile
mysql5.1升级到mysql5.5
mysql_upgrade包含一下三个命令：
# mysqlcheck --check-upgrade --all-databases --auto-repair
# mysql_fix_privilege_tables
# mysqlcheck --all-databases --check-upgrade --fix-db-names --fix-table-names
在每一次的升级过程中，建议执行mysql_upgrade这个命令，通过mysqlcheck命令帮我们去检查表是否兼容新版本的数据库同时作出修复，使用mysql_fix_privilege_tables命令去升级权限表。
/usr/local/mysql/bin/mysql_upgrade -uroot -p
[ERROR] /usr/local/mysql/bin/mysqld: unknown variable 'default_table_type=INNODB'
注释my.cnf中的default_table_type=INNODB
把所有INNODB表转换成MYISAM表的脚本
sed -i 's/$opt_type/$opt_engine/' /usr/local/mysql/bin/mysql_convert_table_format
/usr/local/mysql/bin/mysql_convert_table_format --user='root' --password='veryi.com' --socket='/tmp/mysql.sock' --type='INNODB'
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