1.进入usr的local文件夹中cd /usr/local2.创建mysql文件夹mkdir mysql3.进入mysql文件夹cd mysql4.下载mysql8.0安装包 wget https://dev.mysql.com/get/Downloads/MySQL-8.0/mysql-8.0.20-linux-glibc2.12-x86_64.tar.xz5.进入mysql文件夹中cd /usr/local/mysql6.解压安装包tar xvJf mysql-8.0.20-linux-glibc2.12-x86_64.tar.xz 7.重命名解压出来的文件夹，这里改成mysql-8.0mv mysql-8.0.20-linux-glibc2.12-x86_64 mysql-8.08.在/usr/local/mysql文件夹下创建data文件夹 mkdir data9.分别创建用户组以及用户和密码（如果提示已存在说明之前有创建过了）groupadd mysqluseradd -g mysql mysql10.授权刚刚新建的用户chown -R mysql.mysql /usr/local/mysql/mysql-8.0chmod 750 /usr/local/mysql/data -R11.配置环境，编辑/etc/profile文件vim /etc/profile按a进入编辑模式直接在最后一行加上export PATH=$PATH:/usr/local/mysql/mysql-8.0/bin:/usr/local/mysql/mysql-8.0/lib加上之后按一下esc退出编辑模式，再按 :wq 保存并退出12.编辑my.cnf文件vi /etc/my.cnf 编辑方法和上一条一样，按a进入编辑模式，直接在内容区中复制粘贴如下内容[mysql]default-character-set=utf8mb4[client]

socket=/var/lib/mysql/mysql.sock[mysqld]

user=mysqlgeneral_log = 1general_log_file= /var/log/mysql/mysql.logsocket=/var/lib/mysql/mysql.sockbasedir=/usr/local/mysql/mysql-8.0datadir=/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

[mysqld_safe]log-error=/usr/local/mysql/data/mysql.logpid-file=/usr/local/mysql/data/mysql.pid

添加完后 按esc 再按 :wq保存并退出13.切换到/usr/local/mysql/mysql-8.0/bin目录下cd /usr/local/mysql/mysql-8.0/bin14.初始化基础信息,得到数据库的初始密码./mysqld --user=mysql --basedir=/usr/local/mysql/mysql-8.0 --datadir=/usr/local/mysql/data/ --initialize初始密码如下，先复制一下

cd /usr/local/mysql/mysql-8.016.复制 mysql.server 文件cp -a ./support-files/mysql.server /etc/init.d/mysql cp -a ./support-files/mysql.server /etc/init.d/mysqld17.赋予权限chown 777 /etc/my.cnfchmod +x /etc/init.d/mysqlchmod +x /etc/init.d/mysqld18.检查一下/var/lib/mysql是否存在，否则进行创建mkdir /var/lib/mysql 然后再赋予权限chown -R mysql:mysql /var/lib/mysql/ 19.启动数据库，有SUCCESS或者OK字眼说明MySQL安装完成service mysql start

1.首先进入mysql安装目录下的bin目录，然后从此目录进入cmd执行下面代码跳过权限验证：mysqld --shared-memory --skip-grant-tables 2.然后在次目录下新启一个cmd输入mysql -u root -p3.会提示输入密码，输入后直接回车就行（输入密码时不会显示），进入mysql命令接下来：use mysql;先刷新权限flush privileges;然后是8.0以上的版本用的修改密码的命令，8.0以上得到用：alter user '用户名'@'localhost' identified by '新密码';再刷新权限，让新密码生效：flush privileges;这样密码就修改完毕