1. 前言
本文主要讲解如何在Ubuntu系统上安装各种版本的MySQL，根据个人需求可选择不同的版本，本文所有安装过程和效果都在是在Ubuntu Server 18.04上实现的。基于Ubuntu的其它Linux系统大同小异，同样可参考本教程。
2. 安装Ubuntu默认仓库版本
需要安装其他版本请直接跳过这步
更新apt仓库缓存：
zcwyou@ubuntu1804:~$ sudo apt update
更新apt仓库缓存
查询当前仓库的mysql版本
zcwyou@ubuntu1804:~$ sudo apt-cache show mysql-server
执行结果如下：
Package: mysql-server
Architecture: all
Version: 5.7.24-0ubuntu0.18.04.1
Priority: optional
Section: database
Source: mysql-5.7
Origin: Ubuntu
Maintainer: Ubuntu Developers ubuntu-devel-discuss@
Original-Maintainer: Debian MySQL Maintainers pkg-mysql-maint@lists.
可以看到Ubuntu18.04仓库里默认的MySQL版本为 5.7.24
安装当前仓库的mysql版本
zcwyou@ubuntu1804:~$ sudo apt install mysql-server -y
Reading package lists… Done
Building dependency tree
Reading state information… Done
The following additional packages will be installed:
libaio1 libcgi-fast-perl libcgi-pm-perl libencode-locale-perl libevent-core-2.1-6 libfcgi-perl libhtml-parser-perl libhtml-tagset-perl
libhtml-template-perl libhttp-date-perl libhttp-message-perl libio-html-perl liblwp-mediatypes-perl libtimedate-perl liburi-perl
mysql-client-5.7 mysql-client-core-5.7 mysql-common mysql-server-5.7 mysql-server-core-5.7
Suggested packages:
libdata-dump-perl libipc-sharedcache-perl libwww-perl mailx tinyca
The following NEW packages will be installed:
libaio1 libcgi-fast-perl libcgi-pm-perl libencode-locale-perl libevent-core-2.1-6 libfcgi-perl libhtml-parser-perl libhtml-tagset-perl
libhtml-template-perl libhttp-date-perl libhttp-message-perl libio-html-perl liblwp-mediatypes-perl libtimedate-perl liburi-perl
mysql-client-5.7 mysql-client-core-5.7 mysql-common mysql-server mysql-server-5.7 mysql-server-core-5.7
0 upgraded, 21 newly installed, 0 to remove and 1 not upgraded.
Need to get 21.0 MB of archives.
After this operation, 162 MB of additional disk space will be used.
可以看到，安装mysql 5.7占用空间为162MB。
到这里为止，mysql 5.7已经安装成功。
接下来就是安装后的配置
ubuntu安装mysql 5.7
设置数据库密码并加固安全策略：
zcwyou@ubuntu1804:~$ sudo mysql_secure_installation
Securing the MySQL server deployment.
Connecting to MySQL using a blank password.
VALIDATE PASSWORD PLUGIN can be used to test passwords
and improve security. It checks the strength of password
and allows the users to set only those passwords which are
secure enough. Would you like to setup VALIDATE PASSWORD plugin?
Press y|Y for Yes, any other key for No: y输入y验证密码插件
There are three levels of password validation policy:
LOW Length >= 8
MEDIUM Length >= 8, numeric, mixed case, and special characters
STRONG Length >= 8, numeric, mixed case, special characters and dictionary file
Please enter 0 = LOW, 1 = MEDIUM and 2 = STRONG: 2选择2表示使用密码最强验证策略
Please set the password for root here.
New password: 设置mysql密码
Re-enter new password: 再次输入mysql密码
Estimated strength of the password: 50
Do you wish to continue with the password provided?(Press y|Y for Yes, any other key for No) : y输入y表示继续密码策略设置
By default, a MySQL installation has an anonymous user,
allowing anyone to log into MySQL without having to have
a user account created for them. This is intended only for
testing, and to make the installation go a bit smoother.
You should remove them before moving into a production
environment.
Remove anonymous users? (Press y|Y for Yes, any other key for No) : y输入y删除匿名用户
Success.
Normally, root should only be allowed to connect from
‘localhost’. This ensures that someone cannot guess at
the root password from the network.
Disallow root login remotely? (Press y|Y for Yes, any other key for No) : y输入y禁止远程登录，根据实际需求定义
Success.
By default, MySQL comes with a database named ‘test’ that
anyone can access. This is also intended only for testing,
and should be removed before moving into a production
environment.
Remove test database and access to it? (Press y|Y for Yes, any other key for No) : y输入y删除test数据库
– Dropping test database…
Success.
Removing privileges on test database…
Success.
Reloading the privilege tables will ensure that all changes
made so far will take effect immediately.
Reload privilege tables now? (Press y|Y for Yes, any other key for No) : y输入y重启数据库
Success.
All done!
设置mysql数据库
查看mysql状态：
zcwyou@ubuntu1804:~$ sudo systemctl status mysql.service
下图中，看到active (running)表示正在运行，enabled表示开机自动启动
● mysql.service – MySQL Community Server
Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
Active: active (running) since Tue -01-08 01:32:27 UTC; 9min ago
查看mysql状态
至此，Ubuntu默认版本已经安装启动完毕。
重启mysql服务
zcwyou@ubuntu1804:~$ sudo systemctl restart mysql.service
取消mysql服务自启动：
zcwyou@ubuntu1804:~$ sudo systemctl disable mysql.service
设置mysql服务自启动：
zcwyou@ubuntu1804:~$ sudo systemctl enable mysql.service
如果要删除刚刚安装的版本，执行以下命令：
zcwyou@ubuntu1804:~$ sudo apt remove mysql-server -y && sudo apt auto-remove -y
安装Ubuntu其他版本
浏览器打开以下链接：
/downloads/
打开mysql下载页面
点击下载mysql
查看mysql下载地址
复制mysql下载地址
使用wget下载mysql
zcwyou@ubuntu1804:~$ wget /get/mysql-apt-config_0.8.11-1_all.deb
使用wget下载mysql
执行以下命令，添加mysql的源仓库并选择mysql版本，假设下载回来的文件名为mysql-apt-config_0.8.11-1_all.deb
如果以后重新选择，也是使用以下命令：
zcwyou@ubuntu1804:~$ sudo dpkg -i mysql-apt-config_0.8.11-1_all.deb
选择第一个选择配置mysql版本
根据需求选择mysql版本，这里选择8.0
选择OK确认mysql的安装配置
更新仓库缓存：
zcwyou@ubuntu1804:~$ sudo apt update
确认版本。注意的是仓库默认的mysql名称为mysql-server，而刚刚添加的仓库里的mysql软件包名称为mysql-community-server，所以我们需要查询的是mysql-community-server版本
zcwyou@ubuntu1804:~$ sudo apt-cache show mysql-community-server
Package: mysql-community-server
Source: mysql-community
Version: 8.0.13-1ubuntu18.04
Architecture: amd64
Maintainer: MySQL Release Engineering mysql-build@
可以看到，mysql-community-server版本为8.0.13，这也是我们刚刚选择的版本。
安装它：
zcwyou@ubuntu1804:~$ sudo apt install -y mysql-community-server
图13：安装mysql-community-server
图14：设置mysql密码
设置密码加密强度
安装后的配置请参考上面的教程。
查看mysql状态：
zcwyou@ubuntu1804:~$ sudo systemctl status mysql.service
重启mysql服务
zcwyou@ubuntu1804:~$ sudo systemctl restart mysql.service
取消mysql服务自启动：
zcwyou@ubuntu1804:~$ sudo systemctl disable mysql.service
设置mysql服务自启动：
zcwyou@ubuntu1804:~$ sudo systemctl enable mysql.service
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