安装MySQL版本为：8.0.16
1、首次安装，下载命令：
wget https://dev.mysql.com/get/Downloads/MySQL-8.0/mysql-8.0.20-linux-glibc2.12-x86_64.tar.xz
2、解压
tar xvJf mysql-8.0.20-linux-glibc2.12-x86_64.tar.xz
3.重命名
mv mysql-8.0.20-linux-glibc2.12-x86_64 mysql-8.0
4.创建用户组、用户及其密码
groupadd mysql
useradd -g mysql mysql
6、授权
chown -R mysql.mysql /usr/local/mysql/mysql-8.0
chmod 750 /usr/local/mysql/mysql-8.0/data -R
7、在 /etc/profile 中添加环境变量 并执行 source /etc/profile
export PATH=$PATH:/usr/local/mysql/mysql-8.0/bin:/usr/local/mysql/mysql-8.0/lib
8、配置 /etc/my.cnf
[mysql]default-character-set=utf8mb4[client]#port=3306socket=/var/lib/mysql/mysql.sock [mysqld]#port=3306#server-id=3306user=mysqlgeneral_log = 1general_log_file= /var/log/mysql/mysql.logsocket=/var/lib/mysql/mysql.sockbasedir=/usr/local/mysqldatadir=/usr/local/mysql/datalog-bin=/usr/local/mysql/data/mysql-bininnodb_data_home_dir=/usr/local/mysql/datainnodb_log_group_home_dir=/usr/local/mysql/data/character-set-server=utf8mb4lower_case_table_names=1autocommit=1default_authentication_plugin=mysql_native_passwordsymbolic-links=0# Disabling symbolic-links is recommended to prevent assorted security risks# Settings user and group are ignored when systemd is used.# If you need to run mysqld under a different user or group,# customize your systemd unit file for mariadb according to the# instructions in http://fedoraproject.org/wiki/Systemd [mysqld_safe]log-error=/usr/local/mysql/data/mysql.logpid-file=/usr/local/mysql/data/mysql.pid
9、在/usr/local/mysql/mysql-8.0/bin目录下执行 执行初始化指令
./mysqld –user=mysql –basedir=/usr/local/mysql/mysql-8.0 –datadir=/usr/local/mysql//mysql-8.0/data/ –initialize
操作成功后会给出临时密码：%8s/H*uB!(ed
10、进入/usr/local/mysql/mysql-8.0目录 复制mysql执行文件 并赋予权限
cp -a ./support-files/mysql.server /etc/init.d/mysql
cp -a ./support-files/mysql.server /etc/init.d/mysqld
授权
chown 777 /etc/my.cnf
chmod +x /etc/init.d/mysql
chmod +x /etc/init.d/mysqld
11、创建文件夹 mkdir /var/lib/mysql 并授权
chown -R mysql:mysql /var/lib/mysql/
12、启动MySQL
service mysql start
# SUCCESS 则表示成功
13、用户登录
mysql -uroot -p
此时输入 初始化操作给出的密码就可以登录了
password：%8s/H*uB!(ed （这里输入之前保存的临时密码即可）
14、修改密码
ALTER USER ‘root’@’localhost’ IDENTIFIED WITH mysql_native_password BY ‘新密码’;
flush privileges;#刷新权限
15、设置远程连接
use mysql; # 选择数据库
mysql> create user ‘root’@’%’ identified by ‘password’;
mysql> grant all privileges on *.* to ‘root’@’%’ with grant option;
mysql> flush privileges;
16、到这里，整个安装过程结束。
***遇到的问题
1、权限问题
解决方法：chown mysql:mysql /var/log/mysql/mysql.log
2、data文件夹已存在 删掉data文件夹即可 初始化时自动创建
3、MySQL登录
这里需要输入，之前保存的临时密码，其他任何值都会报错！