本文参考自 http://www.cnblogs.com/ShanFish/p/6531365.html，但不局限于它。
一. 卸载旧版本
1.检查是否安装mysql组件 # rpm -qa | grep mysql 2.如果有，就卸载 # rpm -ev mysql-libs-5.1.71-1.el6.x86_64 # rpm -ev mysql-libs-5.1.71-1.el6.x86_64 --nodeps //强力删除 3.删除相关目录 # whereis mysql # find / -name 'mysql' //在卸载掉第2步的mysql组件后，下面的目录应该就被删除了（如果还存在的话，手动删除） # rm -rf /usr/share/mysql # rm -rf /usr/lib64/mysql
二. 编译安装
1.安装编译所需的软件包
yum -y install make gcc-c++ cmake bison-devel ncurses-devel
2.下载解压
终端的文件下载地址我也没有，可以去这个网址 http://download.csdn.net/download/lhat_7/9863714 下载压缩包
tar xvf mysql-5.5.21.tar.gz cd mysql-5.5.21
3.编译安装
cmake -DCMAKE_INSTALL_PREFIX=/usr/local/mysql -DMYSQL_DATADIR=/usr/local/mysql/data -DSYSCONFDIR=/etc -DWITH_MYISAM_STORAGE_ENGINE=1 -DWITH_INNOBASE_STORAGE_ENGINE=1 -DWITH_MEMORY_STORAGE_ENGINE=1 -DWITH_READLINE=1 -DMYSQL_UNIX_ADDR=/var/lib/mysql/mysql.sock -DMYSQL_TCP_PORT=3306 -DENABLED_LOCAL_INFILE=1 -DWITH_PARTITION_STORAGE_ENGINE=1 -DEXTRA_CHARSETS=all -DDEFAULT_CHARSET=utf8 -DDEFAULT_COLLATION=utf8_general_ci make && make install
报错1：
-- MySQL 5.5.21 Warning: Bison executable not found in PATH -- Configuring done CMake Warning (dev) in sql/CMakeLists.txt: Policy CMP0022 is not set: INTERFACE_LINK_LIBRARIES defines the link interface. Run "cmake --help-policy CMP0022" for policy details. Use the cmake_policy command to set the policy and suppress this warning. Target "mysqld" has an INTERFACE_LINK_LIBRARIES property which differs from its LINK_INTERFACE_LIBRARIES properties. INTERFACE_LINK_LIBRARIES: -lpthread;sql;mysys LINK_INTERFACE_LIBRARIES: rt This warning is for project developers. Use -Wno-dev to suppress it. -- Generating done -- Build files have been written to: /mnt/mysql-5.5.21
百度之后得到答案 yum install bison
重新编译前要清缓存
make clean rm -f CMakeCache.txt rm -rf /etc/my.cnf
再次编译有报错2：
CMake Warning (dev) in sql/CMakeLists.txt: Policy CMP0022 is not set: INTERFACE_LINK_LIBRARIES defines the link interface. Run "cmake --help-policy CMP0022" for policy details. Use the cmake_policy command to set the policy and suppress this warning. Target "mysqld" has an INTERFACE_LINK_LIBRARIES property which differs from its LINK_INTERFACE_LIBRARIES properties. INTERFACE_LINK_LIBRARIES: -lpthread;sql;mysys LINK_INTERFACE_LIBRARIES: rt This warning is for project developers. Use -Wno-dev to suppress it. -- Generating done -- Build files have been written to: /mnt/install_package/mysql-5.5.21
解决方法：没找到解决方法（我没管它，直接下一步了）
make && make install
这是一个漫长的过程，等待...
三. 配置MySQL
1. 设置权限
查看是否有mysql用户和用户组
cat /etc/passwd cat /etc/group
如果没有就添加用户和用户组
groupadd mysql
useradd -g mysql mysql
修改 /usr/local/mysql 权限
chown -R mysql:mysql /usr/local/mysql
2.初始化mysql
执行初始化配置脚本，创建系统自带的数据库和表
cd /usr/local/mysql
scripts/mysql_install_db --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --user=mysql
3.添加mysql服务
如果/etc目录下之前存在my.cnf文件，将其重命名作为备份
mysql服务启动时，会优先在 /etc 目录下查找 my.cnf
cp support-files/mysql.server /etc/init.d/mysql chkconfig mysql on service mysql start
4.配置mysql用户
把 /usr/local/mysql/bin 目录添加到PATH里，这样在任何地方都能直接调用该目录下的命令了。
vim /etc/profile //在 /etc/profile 的末尾添加 export PATH=$PATH/usr/local/mysql/bin //关闭文件，运行下面的命令，使配置立即生效 source /etc/profile
mysql启动成功后，root用户默认没有密码，我们需要为它设置密码
mysqladmin -uroot -p password <new_password>
最后使用密码登录
【 参考随笔】