一、通过apt 安装MySQL服务（推荐，会安装最新版）
#命令1 更新源
sudo apt-get update
#命令2 安装mysql服务
sudo apt-get install mysql-server
二、初始化配置
sudo mysql_secure_installation
配置项较多，如下所示：
#1
VALIDATE PASSWORD PLUGIN can be used to test passwords...
Press y|Y for Yes, any other key for No: N (选择N ,不会进行密码的强校验)
#2
Please set the password for root here...
New password: (输入密码)
Re-enter new password: (重复输入)
#3
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 (选择N，不删除匿名用户)
#4
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 (选择N，允许root远程连接)
#5
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 (选择N，不删除test数据库)
#6
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 (选择Y，修改权限立即生效)
三、检查mysql服务状态
systemctl status mysql.service
四、配置远程访问
在Ubuntu下MySQL缺省是只允许本地访问的，使用workbench连接工具是连不上的；
如果你要其他机器也能够访问的话，需要进行配置；
找到 bind-address 修改值为 0.0.0.0(如果需要远程访问)
sudo vi /etc/mysql/mysql.conf.d/mysqld.cnf
#找到 bind-address 修改值为 0.0.0.0(如果需要远程访问)
sudo /etc/init.d/mysql restart #重启mysql
登录数据库
sudo mysql -uroot -p
如果为了安全性，设置了用户验证，必须使用sudo，才能登录，出现如下情况：（尽量不要设置ubuntu用户在验证，否则会很麻烦）
mysql -uroot -p
解决方法：
sudo vim /etc/mysql/my.cnf
添加以下字段
[mysqld]
skip-grant-tables
保存后重启mysql，可以正常登陆了
systemctl restart mysql
这样操作后，是相当于跳过了mysql的密码认证。很不安全，直接就可以登录进去。
