查看是否安裝Mysql

sudo netstat -tap | grep mysql

如果為空則沒有安裝，進行安裝：

sudo apt-get install mysql-server mysql-client

根據提示輸入密碼，然后確認..

Mysql 連接測試

mysql -u root -h localhost -p

啟動，停止，重啟 Mysql命令

sudo service mysql start

sudo service mysql stop

sudo service mysql restart

Ubuntu 安裝 mysql 忘記初始密碼解決方法

//打開這個文件 /etc/mysql/debian.cnf

//查看默認分配的密碼

[client]

host = localhost

user = debian-sys-maint

password = eyPDN7kavhmjCZUn (記住這個密碼)

socket = /var/run/mysqld/mysqld.sock

輸入命令進入mysql修改用戶密碼

// 輸入命令后把上面的密碼粘貼進去

mysql -udebian-sys-maint -p

//進入到mysql界面厚修改密碼

update mysql.user set authentication_string=password('newpassword') where user='root'

//都要使用刷新權限列表

flush privileges;

重新啟動Mysql服務即可

https://stackoverflow.com/questions/39281594/error-1698-28000-access-denied-for-user-rootlocalhost

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The reason is that recent Ubuntu installation (maybe others also), mysql is using by default the UNIX auth_socket plugin.

Basically means that: db_users using it, will be "auth" by the system user credentias. You can see if your root user is set up like this by doing the following:

$ sudo mysql -u root # I had to use "sudo" since is new installation

mysql> USE mysql;

mysql> SELECT User, Host, plugin FROM mysql.user;

+------------------+-----------------------+

| User | plugin |

+------------------+-----------------------+

| root | auth_socket |

| mysql.sys | mysql_native_password |

| debian-sys-maint | mysql_native_password |

+------------------+-----------------------+

As you can see in the query, the root user is using the auth_socket plugin

There are 2 ways to solve this:

You can set the root user to use the mysql_native_password plugin

You can create a new db_user with you system_user (recommended)

Option 1:

$ sudo mysql -u root # I had to use "sudo" since is new installation

mysql> USE mysql;

mysql> UPDATE user SET plugin='mysql_native_password' WHERE User='root';

mysql> FLUSH PRIVILEGES;

mysql> exit;

$ service mysql restart

Option 2: (replace YOUR_SYSTEM_USER with the username you have)

$ sudo mysql -u root # I had to use "sudo" since is new installation

mysql> USE mysql;

mysql> CREATE USER 'YOUR_SYSTEM_USER'@'localhost' IDENTIFIED BY '';

mysql> GRANT ALL PRIVILEGES ON *.* TO 'YOUR_SYSTEM_USER'@'localhost';

mysql> UPDATE user SET plugin='auth_socket' WHERE User='YOUR_SYSTEM_USER';

mysql> FLUSH PRIVILEGES;

mysql> exit;

$ service mysql restart

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可以通過如下命令進入MySQL服務：

mysql -uroot -p你的密碼

現在設置mysql允許遠程訪問，首先編輯文件/etc/mysql/mysql.conf.d/mysqld.cnf：

sudo vi /etc/mysql/mysql.conf.d/mysqld.cnf

注釋掉bind-address = 127.0.0.1：

保存退出，然后進入mysql服務，執行授權命令：

grant all on *.* to root@'%' identified by '你的密碼' with grant option;

flush privileges;

然后執行quit命令退出mysql服務，執行如下命令重啟mysql：

service mysql restart

總結

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