ubuntu20.04安装mysql5.7

ubuntu 20.04系统自带源直接安装是MySQL 8.0，要安装MySQL 5.7的版本的所以先进行换源

1.1 备份原来的sorce文件

sudo cp /etc/apt/sources.list /etc/apt/sources.list.old

1.2 修改sources.list文件

sudo vim /etc/apt/sources.list 

我选择的是清华镜像源。将sources.list内容清空，然后选择一个源粘贴到sources.list，保存退出。注意：vim清空内容，先gg进入首行，然后dG即可

更换清华镜像

# 清华镜像源
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted universe multiverse

1.3 更新镜像源和软件

# 更新镜像源
sudo apt-get update
# 更新软件
sudo apt-get upgrade  

apt-get install libtinfo5
apt-get install mysql-client-core-5.7
apt-get install mysql-client-5.7
apt-get install mysql-server-5.7

设置root用户的密码

确认密码

回车继续即可。

查看mysql的版本

root@WP:/etc/apt# mysql -V
mysql  Ver 14.14 Distrib 5.7.33, for Linux (x86_64) using  EditLine wrapper

查看运行状态

root@WP:/etc/apt# ps -ef|grep mysql
mysql       8002       1  0 15:56 ?        00:00:00 /usr/sbin/mysqld
root        9151    4643  0 15:56 pts/1    00:00:00 grep --color=auto mysql

1.ssh连接

2.主机要写localhost，而不是ip，因为我们已经连接到了主机。