ubuntu 卸载mysql并重新安装

Posted 2021-08-30 hequnwang10

dpkg --list|grep mysql
sudo apt-get remove mysql-*
 sudo apt-get autoremove mysql* --purge
 dpkg -l |grep ^rc|awk '{print $2}' |sudo xargs dpkg -P

安装

apt install mysql-server
netstat -tap | grep mysql
mysql -u root -p  
#输入密码时直接按回车建
 show databases;

这里就安装成功了！
接下来，为了确保数据库的安全性和正常运转，对数据库进行初始化操作。这个初始化操作涉及下面5个步骤。

1. 安装验证密码插件。

2. 设置root管理员在数据库中的专有密码。

3. 随后删除匿名账户，并使用root管理员从远程登录数据库，以确保数据库上运行的业务的安全性。

4. 删除默认的测试数据库，取消测试数据库的一系列访问权限。

5. 刷新授权列表，让初始化的设定立即生效。

对于上述数据库初始化的操作步骤，在下面的输出信息旁边我做了简单注释。

root@ubuntu-virtual-machine:~# 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? # 要安装验证密码插件吗?

Press y|Y for Yes, any other key for No: N == # 这里我选择N==
Please set the password for root here.

New password: == # 输入要为root管理员设置的数据库密码==

Re-enter new password: # 再次输入密码

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 == # 删除匿名账户==
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) : N == # 禁止root管理员从远程登录，这里我没有禁止==

… skipping.
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 == # 删除test数据库并取消对它的访问权限==

• 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 # 刷新授权表，让初始化后的设定立即生效
Success.

All done!

检查mysql服务状态：

systemctl status mysql

显示如下结果说明mysql服务运行是正常的：

再次用mysql -u root -p命令，Enter password:处输入刚设置的密码，回车，就能够进入mysql数据库。

使用 use mysql; 命令打开mysql命名的数据库，显示当前数据库的表：show tables; 查询user表里的数据：select * from user;（user表里是mysql数据库的所有账户信息）

现在配置mysql允许远程访问，首先编辑 /etc/mysql/mysql.conf.d/mysqld.cnf 配置文件：

vim /etc/mysql/mysql.conf.d/mysqld.cnf

注释掉bind-address = 127.0.0.1

保存退出，然后进入mysql数据库，执行授权命令：

mysql -u root -p

mysql> grant all on . to root@’%’ identified by ‘你的密码’ with grant option;

mysql> flush privileges; # 刷新权限

mysql> exit

然后执行exit命令退出mysql服务，再执行如下命令重启mysql：

systemctl restart mysql

现在Windows下可以使用Navicat图形化工具远程连接Ubuntu下的MySQL数据库，输入刚授权远程权限的密码。