Ubuntu18.10安装及卸载MySQL、Apache、PHP

MySQL

安装MySQL

sudo apt-get update
sudo apt-get install mysql-server

简单配置MySQL

 sudo mysql_secure_installation

配置项较多，如下所示：

VALIDATE PASSWORD PLUGIN can be used to test passwords…
Press y|Y for Yes, any other key for No: N
Please set the password for root here…
New password: (输入密码)
Re-enter new password: (重复输入)
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…
Remove anonymous users? (Press y|Y for Yes, any other key for No) : N
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
By default, MySQL comes with a database named ‘test’ that
anyone can access…
Remove test database and access to it? (Press y|Y for Yes, any other key for No) : N
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

配置远程访问

 sudo mysql -uroot -p

此时，进入数据库，只能使用sudo,按照一下修改，可以解决：
进入数据库，修改root密码：

#≤5.7
update mysql.user set authentication_string=PASSWORD('新密码'),plugin='mysql_native_password' where user='root';

#≥5.8
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '新密码';
（==这是一条命令,此处注意要改为因为英文标点符号==）

刷新：

flush privileges;

此时通过mysql -u root -p 免sudo登录mysql了

卸载步骤

- sudo apt purge mysql-*
- sudo rm -rf /etc/mysql/
- sudo rm -rf /var/lib/mysql/
- sudo apt autoremove
- sudo apt autoclean

大功告成！

Apache

安装apache2

$ sudo apt-get install apache2
$ sudo /etc/init.d/apache2 restart

卸载apache

卸载命令:

$ sudo apt-get --purge remove apache2
$ sudo apt-get --purge remove apache2.2-common
$ sudo apt-get autoremove

（关键一步）找到没有删除掉的配置文件，一并删除

$ sudo find  /etc -name "*apache*" -exec  rm -rf {} \;
$ sudo rm -rf /var/www

完成！

卸载php7

• 删除php的相关包及配置

sudo apt-get autoremove php7*

• 删除关联

sudo find /etc -name "*php*" |xargs  rm -rf (root权限下运行)

• 清除dept列表

sudo apt purge `dpkg -l | grep php| awk '{print $2}' |tr "\n" " "`

• 检查是否卸载干净（无返回就是卸载完成）

dpkg -l | grep php7.0