记录一下安装过程，不必每次都百度搜教程。
从mysql官网上下载自己适合的mysql版本https://dev.mysql.com/downloads/mysql/5.6.html#downloads
只不过要账号，我没有，自己改了一个wget地址下载的
wget http://dev.mysql.com/get/Downloads/MySQL-5.6/mysql-5.6.45-linux-glibc2.12-x86_64.tar.gz
wget http://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.17-linux-glibc2.5-x86_64.tar.gz
我自己安装的5.6 x64版本
首先进入/usr/soft，把文件下载到这里，或者把下载好的文件传到这个文件
没有soft文件夹就 mkdir soft新建一个
下面是我已经上传好的
解压tar -zxvf mysql-5.6.45-linux-glibc2.12-x86_64.tar.gz
得到解压后的文件
将解压后的文件重命名为mysql
mv mysql-5.6.45-linux-glibc2.12-x86_64 mysql
把文件移到 /usr/local
mv /usr/soft/mysql ./
创建mysql用户组及用户
groupadd mysql
useradd -r -g mysql mysql
进入到mysql目录，执行添加MySQL配置的操作
cd mysql/
cp support-files/my-default.cnf /etc/my.cnf
输入y确定
编辑/etc/my.cnf文件
vi /etc/my.cnf
在配置文件里添加或者修改配置
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html
# *** DO NOT EDIT THIS FILE. It's a template which will be copied to the
# *** default location during install, and will be replaced if you
# *** upgrade to a newer version of MySQL.
[mysqld]
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
# These are commonly set, remove the # and set as required.
basedir = /usr/local/mysql
datadir = /usr/local/mysql/data
port = 3306
# server_id = .....
socket = /tmp/mysql.sock
character-set-server = utf8
skip-name-resolve
log-err = /usr/local/mysql/data/error.log
pid-file = /usr/local/mysql/data/mysql.pid
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
摁esc键 输入'：wq'保存退出
在mysql当前目录下设定目录的访问权限（注意后面的小点，表示当前目录）
chown -R mysql .
chgrp -R mysql .
scripts/mysql_install_db --user=mysql
chown -R root .
chown -R mysql data
初始化数据（在mysql/scripts下有个 mysql_install_db 可执行文件初始化数据库），进入mysql/scripts目录下
执行下面命令
./mysql_install_db --verbose --user=root --defaults-file=/etc/my.cnf --datadir=/usr/local/mysql/data --basedir=/usr/local/mysql --pid-file=/usr/local/mysql/data/mysql.pid --tmpdir=/tmp
启动mysql，进入/usr/local/mysql/bin
./mysqld_safe --defaults-file=/etc/my.cnf --socket=/tmp/mysql.sock --user=root &
设置开机启动，新开启shell中断后，进入mysql目录，执行下面命令
cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysqld
cp /usr/local/mysql/support-files/mysql.server /etc/rc.d/init.d/mysql
chmod 700 /etc/init.d/mysql chkconfig --add mysqld chkconfig --level 2345 mysqld on chown mysql:mysql -R /usr/local/mysql/
重启linux
reboot
查看mysql状态
service mysqld status
添加mysql命令
ln -s /usr/local/mysql/bin/mysql /usr/bin
登录mysql,执行下面命令
mysql -uroot -p
没有密码，直接回车
输入下面两个命令，更改访问权限
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'duan' with grant option;
Flush privileges;
修改root密码
mysql>use mysql;
mysql> update user set password=password("新密码") where user='root'; 【密码注意大小写】
mysql> flush privileges;
mysql> exit;
保存退出exit
可以重启一下服务器reboot
我这里直接关闭mysql然后重启一下
关闭mysql
service mysqld stop
启动mysql
service mysqld start
然后用新设置的密码登录
mysql -uroot -p
OK了
记录一下，不会忘，真特么机智