我一直在按照手册在Ubuntu上安装软件套件。我完全不了解MySQL。我已经在我的Ubuntu上完成了以下安装。
sudo apt-get update
sudo apt-get install mysql-server-5.5
sudo apt-get install mysql-client-5.5
sudo apt-get install mysql-common
sudo apt-get install glade
sudo apt-get install ntp
然后我做了
cd ~/Desktop/iPDC-v1.3.1/DBServer-1.1
mysql -uroot -proot <"Db.sql"
我最终得到以下错误消息。
错误1045(28000):拒绝访问用户'root'@'localhost'(使用密码:YES)
我该如何修复它并继续?
当前回答
如果问题仍然存在，请尝试强制修改密码。
停止MySQL服务器(Linux):
/etc/init.d/mysql stop
停止MySQL服务器(Mac OS X):
mysql.server stop
使用——skip-grant-tables启动mysqld_safe守护进程:
mysqld_safe --skip-grant-tables &
mysql -u root
设置新的MySQL root用户密码:
use mysql;
update user set password=PASSWORD("NEW-ROOT-PASSWORD") where User='root';
flush privileges;
quit;
停止MySQL服务器(Linux):
/etc/init.d/mysql stop
停止MySQL服务器(Mac OS X):
mysql.server stop
启动MySQL服务器服务，测试以root用户登录:
mysql -u root -p
其他回答
虽然上面的答案(使用mysqladmin)在macOS v10.15 (Catalina)上有效，但在Ubuntu上无效。然后我尝试了许多其他的选项，包括MySQL的安全启动，但都不起作用。
下面是一个例子:
至少在这个版本中，我得到了5.7.28-0ubuntu0.18.04.4的答案缺少IDENTIFIED WITH mysql_native_password。5.7.28是当前LTS的默认设置，因此应该是大多数新系统的默认设置(直到Ubuntu 20.04 (Focal Fossa) LTS问世)。
我发现不能设置root密码MySQL服务器，现在应用
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'your_pass_here';
这是可行的。
注意:对于MySQL 5.7+，请参见Lahiru对这个问题的回答。这包含了更多的最新信息。
对于MySQL < 5.7:
默认root密码为空(即空字符串)，而不是root。所以你可以登录为:
mysql -u root
安装完成后，您显然应该更改root密码:
mysqladmin -u root password [newpassword]
在大多数情况下，您还应该在广泛使用数据库之前设置个人用户帐户。
我使用的是mysql-5.7.12-osx10.11-x86_64。dmg在Mac OS X上。
安装过程会自动为root用户设置一个临时密码。你应该保存密码。密码不可恢复。
按照说明操作:
Go to cd /usr/local/mysql/bin/ Enter the temporary password (which would look something like, "tsO07JF1=>3") You should get the mysql> prompt. Run, SET PASSWORD FOR 'root'@'localhost' = PASSWORD('{YOUR_PASSWORD}'); If you wish to set your password: "root" then the command would be, SET PASSWORD FOR 'root'@'localhost' = PASSWORD('root'); Run ALTER USER 'root'@'localhost' PASSWORD EXPIRE NEVER; Run exit Run ./mysql -u root -p Type your password. In my case I would type, "root" (without quote) That's all.
为了方便起见，您应该在PATH环境变量中添加“/usr/local/mysql/bin”。
现在你可以在任何地方输入。/mysql -u root -p，然后输入密码，你会得到mysql>提示。
我可以通过执行这条语句来解决这个问题
sudo dpkg-reconfigure mysql-server-5.5
这将改变根密码。
当您的密码丢失时就会发生这种情况。
忘记密码时的修改步骤:
Stop MySQL Server (on Linux): sudo systemctl stop mysql Start the database without loading the grant tables or enabling networking: sudo mysqld_safe --skip-grant-tables --skip-networking & The ampersand at the end of this command will make this process run in the background, so you can continue to use your terminal and run mysql -u root (as root). It will not ask for a password. If you get error like as below: 2018-02-12T08:57:39.826071Z mysqld_safe Directory '/var/run/mysqld' for UNIX socket file don't exists. mysql -u root ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) [1]+ Exit 1 Make MySQL service directory. sudo mkdir /var/run/mysqld Give MySQL user permission to write to the service directory. sudo chown mysql: /var/run/mysqld Run the same command in step 2 to run MySQL in background. Run mysql -u root. You will get the MySQL console without entering a password. Run these commands FLUSH PRIVILEGES; For MySQL 5.7.6 and newer ALTER USER 'root'@'localhost' IDENTIFIED BY 'new_password'; For MySQL 5.7.5 and older SET PASSWORD FOR 'root'@'localhost' = PASSWORD('new_password'); If the ALTER USER command doesn't work use: UPDATE mysql.user SET authentication_string = PASSWORD('new_password') WHERE User = 'root' AND Host = 'localhost'; Now exit To stop the instance started manually: sudo kill `cat /var/run/mysqld/mysqld.pid` Restart MySQL sudo systemctl start mysql
