Ubuntu18.04 安装MySQL

Ubuntu18.04 安装MySQL

环境信息： 
OS：Ubuntu18.04 
MySQL: 5.7.22

1.安装MySQL

在 Ubuntu 18.04 中，默认情况下，只有最新版本的 MySQL 包含在 APT 软件包存储库中,要安装它，只需更新服务器上的包索引并安装默认包 apt-get。

#命令1
sudo apt-get update
#命令2
sudo apt-get install mysql-server

2.配置MySQL

2.1 安装配置

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 (我的选项)

#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 (我的选项)

#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) : Y (我的选项)

#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 (我的选项)

#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 (我的选项)

部分图示： 
 

2.2 检查mysql服务状态：

systemctl status mysql.service

显示如下结果说明mysql服务是正常的：

● mysql.service - MySQL Community Server
   Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: en
   Active: active (running) since Sat 2018-06-23 11:09:03 CST; 6min ago
 Main PID: 14078 (mysqld)
    Tasks: 29 (limit: 4915)
   CGroup: /system.slice/mysql.service
           └─14078 /usr/sbin/mysqld --daemonize --pid-file=/run/mysqld/mysqld.pi
6月 23 11:09:02 weision systemd[1]: Starting MySQL Community Server...
6月 23 11:09:03 weision systemd[1]: Started MySQL Community Server.

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3.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，那么需要改变/etc/mysql/my.cnf配置文件； 
3.1 首先用根用户进入：

sudo mysql -uroot -p

默认的MySQL安装之后根用户是没有密码的，命令执行后会让你设置root的密码，进入root后才能进行其他设置： 
 
以root进入mysql后也可用命令给root设置密码：

GRANT ALL PRIVILEGES ON *.* TO root@localhost IDENTIFIED BY "123456";

 
3.2 新建数据库和用户 
用root用户新建数据和用作远程访问的用户

##1 创建数据库weixx
CREATE DATABASE weixx;
##2 创建用户wxx(密码654321) 并赋予其weixx数据库的所有权限
GRANT ALL PRIVILEGES ON weixx.* TO wxx@localhost IDENTIFIED BY "654321";

3.3 进行远程访问或控制配置

##1 允许wxx用户可以从任意机器上登入mysql
GRANT ALL PRIVILEGES ON weixx.* TO wxx@"%" IDENTIFIED BY "654321"; 

$sudo gedit /etc/mysql/my.cnf
##在最后添加如下配置，允许其他机器访问MySQL
>skip-networking => # skip-networking

到此位置，就配置好了。

4.使用workbench连接数据库

打开workbench进行连接配置： 
 
配置完成后，在主界面选择weixx数据库进行连接：