centos-7安装MySql5.7

# 杀死现在正在运行的mysql进程
pkill -9 mysqld
#  查看已经安装的mysql
rpm -qa|grep -i mysql
# 删除旧版本mysql
yum -y remove mysql版本
# 卸载不掉的用 rpm -ev
# 进入
cd /usr/local/src/
# 下载mysql源
wget http://repo.mysql.com/mysql57-community-release-el7-8.noarch.rpm
# 更改源
rpm -ivh mysql57-community-release-el7-8.noarch.rpm
# 安装mysql
yum -y install mysql-server

# 默认配置文件路径： 
# 配置文件：/etc/my.cnf 
# 日志文件：/var/log/var/log/mysqld.log 
# 服务启动脚本：/usr/lib/systemd/system/mysqld.service 
# socket文件：/var/run/mysqld/mysqld.pid

# 启动mysql服务
service mysqld restart
# 查看mysql默认密码
grep "password" /var/log/mysqld.log
# 登录mysql
mysql -u root -p   密码