安装MySQL(这里我们安装的是mysql-5.7.22-linux-glibc2.12-x86_64.tar.gz)
先检查系统自带的mysql:
rpm –qa|grep –i mysql
#rpm -qa |grep -i mysql
mysql-libs-5.1.71-1.el6.x86_64
卸载掉：
rpm-e --nodeps mysql-libs-5.1.71-1.el6.x86_64
创建mysql用户和组
groupadd mysql
useradd -r -g mysql mysql
解压mysql到指定安装目录下，一般选择/usr/local/，这里选择/home/mysql:
#cd /home/mysql
#tar -zxvf mysql-5.7.22-linux-glibc2.12-x86_64
###更改授权给mysql用户和组
[root@localhost]#chown -R mysql:mysql mysql-5.7.22-linux-glibc2.12-x86_64
接下来配置mysql配置文件，内容如下(红字为必要添加的内容):
[root@hl-gftest1etc]# vi /etc/my.cnf
# For advice on how to change settingsplease see
# http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html
# *** DO NOT EDIT THIS FILE. It's atemplate which will be copied to the
# *** default location during install, andwill be replaced if you
# *** upgrade to a newer version of MySQL.
[mysqld]
# Remove leading # and set to the amount ofRAM for the most important data
# cache in MySQL. Start at 70% of total RAMfor dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
# Remove leading # to turn on a veryimportant data integrity option: logging
# changes to the binary log betweenbackups.
# log_bin
# These are commonly set, remove the # andset as required.
basedir=/home/mysql/mysql-5.7.22-linux-glibc2.12-x86_64
datadir=/home/mysql/mysql-5.7.22-linux-glibc2.12-x86_64/data
max_allowed_packet=200M
# port = .....
# server_id = .....
# socket = .....
character_set_server =utf8
init_connect = 'SET NAMESutf8'
# Remove leading # to set options mainlyuseful for reporting servers.
# The server defaults are faster fortransactions and fast SELECTs.
# Adjust sizes as needed, experiment tofind the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
lower_case_table_names=1
[mysql]
default-character-set =utf8
[mysql.server]
default-character-set =utf8
[mysqld_safe]
default-character-set =utf8
[client]
default-character-set =utf8
将mysql配置文件配置到环境变量，添加到/etc/profile中
vim /etc/profile
在PATH中添加mysql的安装目录和bin目录：
/home/mysql/mysql-5.7.22-linux-glibc2.12-x86_64:/home/mysql/mysql-5.7.22-linux-glibc2.12-x86_64/bin:
添加位置如下：
重启服务器或source /etc/profile使配置文件生效
cp -ar /home/mysql/mysql-5.7.22-linux-glibc2.12-x86_64/support-files/mysql.server /etc/init.d/mysqld
接下来使用mysql用户初始化数据库
cd /home/mysql/mysql-5.7.22-linux-glibc2.12-x86_64
mkdir data
bin/mysql_install_db --user=mysql --basedir=/home/mysql/mysql-5.7.22-linux-glibc2.12-x86_64 --datadir=/home/mysql/mysql-5.7.22-linux-glibc2.12-x86_64/data
启动mysql服务：
service mysqld start
修改root密码(如果mysqladmin修改root密码报错，请参考https://blog.csdn.net/u012206025/article/details/80927778)：
cd /home/mysql/mysql-5.7.22-linux-glibc2.12-x86_64/bin
mysqladmin -uroot password 'root@123'
登陆查看字符集：
mysql -uroot –p
然后输入密码回车进入数据库：
查看字符集设置是否正确：
show variables like '%character%';
开启远程连接：选择要使用的mysql数据库，修改远程连接的基本信息。
use mysql
更改远程连接设置：
GRANTALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'root@123' WITH GRANTOPTION;
刷新刚才修改的权限，使其生效
flush privileges;
查看修改是否成功：
select host,user from user;
有红框里的东西就成功,退出重启mysql。
退出mysql：mysql>quit
service mysqld restart
Mysql至此安装完毕，安装mysql比较容易出错，我们只要根据mysql的data目录下生成的xxxx.err日志文件信息来调整就行了。