1、这里我将Mysql安装在/usr/local/mysql目录里面，也可以安装在其他地方;
mkdir /usr/local/mysql
2、到MySQL官网下载安装包
这个是我下载的
3、解压并复制
tar -zxvf mysql-5.7.11-Linux-glibc2.5-x86_64.tar.gz
mv mysql-5.7.11-Linux-glibc2.5-x86_64/* /usr/local/mysql/
4、创建data目录
mkdir /usr/local/mysql/data
5、创建mysql用户组及其用户
groupadd mysql
useradd -r -g mysql mysql
如果已经存在，没关系，不影响安装
6、初始化数据
[[email protected] mysql] ./bin/mysql_install_db --user=mysql --basedir=/usr/local/mysql/ --datadir=/usr/local/mysql/data/
2016-01-20 02:47:35 [WARNING] mysql_install_db is deprecated. Please consider switching to mysqld --initialize
2016-01-20 02:47:45 [WARNING] The bootstrap log isn't empty:
2016-01-20 02:47:45 [WARNING] 2016-01-19T18:47:36.732678Z 0 [Warning] --bootstrap is deprecated. Please consider using --initialize instead
2016-01-19T18:47:36.750527Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2016-01-19T18:47:36.750560Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
7、复制配置文件到 /etc/my.cnf
cp -a ./support-files/my-default.cnf /etc/my.cnf (选择y)
我安装的没有my-default.cnf，我从别的地方复制到这里一个
8、MySQL的服务脚本放到系统服务中
cp -a ./support-files/mysql.server /etc/init.d/mysqld
修改my.cnf文件
# 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 //此处因为在我之前有人在测试环境安装过mysql,所以不知道为什么这个地址，我写/var/lib/mysql.sock才好使
character-set-server = utf8
# 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
9、创建In
ln -s /usr/local/mysql/ /usr/bin/
10、启动服务
service mysqld start
11、初始化密码
mysql5.7会生成一个初始化密码，在root中.mysql_secret文件中。
[[email protected] ~]# cat /root/.mysql_secret
# Password set for user '[email protected]' at 2017-03-16 00:52:34
ws;fmT7yh0CM
12、登录并修改密码 ，如果此处一直报密码输入错误，可以在my.cnf中 写
原创：https://blog.csdn.net/lisongjia123/article/details/57418989
可以免密码登录之后：
用修改后的密码登录之后，再次登录，再用alter修改密码就可以正常使用了
[[email protected] ~]# mysql -u root -p
alter user [email protected] identified by 'tiger';
flush privileges;
13、退出重新登录，完成
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
rows in set (0.11 sec)
原创：https://www.cnblogs.com/xiaotao726/p/6562265.html