How to start MySQL with --skip-grant-tables?

问题

I locked my root user out from our database. I need to get all privileges back to the root user. I have my password and I can log in to MySQL. But the root user has no all privileges.

回答1:

I had the same problem as the title of this question, so incase anyone else googles upon this question and wants to start MySql in 'skip-grant-tables' mode on Windows, here is what I did.

Stop the MySQL service through Administrator tools, Services.

Modify the my.ini configuration file (assuming default paths)

C:\Program Files\MySQL\MySQL Server 5.5\my.ini

or for MySQL version >= 5.6

C:\ProgramData\MySQL\MySQL Server 5.6\my.ini

In the SERVER SECTION, under [mysqld], add the following line:

skip-grant-tables

so that you have

# SERVER SECTION
# ----------------------------------------------------------------------
#
# The following options will be read by the MySQL Server. Make sure that
# you have installed the server correctly (see above) so it reads this 
# file.
#
[mysqld]

skip-grant-tables

Start the service again and you should be able to log into your database without a password.

回答2:

How to re-take control of the root user in MySQL.

DANGER: RISKY OPERATTION

Start session ssh (using root if possible).
Edit my.cnf file using.
```
sudo vi /etc/my.cnf
```
Add line to mysqld block.*
```
skip-grant-tables
```
Save and exit.
Restart MySQL service.
```
service mysql restart
```
Check service status.
```
service mysql status
```
Connect to mysql.
```
mysql
```
Using main database.
```
use mysql;
```

Redefine user root password.

UPDATE user SET `authentication_string` = PASSWORD('myNuevoPassword') WHERE `User` = 'root';

Edit file my.cnf.
```
sudo vi /etc/my.cnf
```
Erase line.
```
skip-grant-tables
```
Save and exit.
Restart MySQL service.
```
service mysqld restart
```
Check service status.
```
service mysql status
```
Connect to database.
```
mysql -u root -p
```
Type new password when prompted.

This action is very dangerous, it allows anyone to connect to all databases with no restriction without a user and password. It must be used carefully and must be reverted quickly to avoid risks.

回答3:

After trying lots of things, this is what worked for me:

sudo mysql -u root
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'newpassword';

So first we use sudo to log in mysql as root without needing a password. Then we just update root's password.

After that, I restarted mysqld:

sudo service mysql restart

And the newpassword logged root in!

回答4:

On the Linux system you can do following (Should be similar for other OS)

Check if mysql process is running:

sudo service mysql status

If runnning then stop the process: (Make sure you close all mysql tool)

sudo service mysql stop

If you have issue stopping then do following

Search for process: ps aux | grep mysqld Kill the process: kill -9 process_id

Now start mysql in safe mode with skip grant

sudo mysqld_safe --skip-grant-tables &

回答5:

If you use mysql 5.6 server and have problems with C:\Program Files\MySQL\MySQL Server 5.6\my.ini:

You should go to C:\ProgramData\MySQL\MySQL Server 5.6\my.ini.

You should add skip-grant-tables and then you do not need a password.

# SERVER SECTION
# ----------------------------------------------------------------------
#
# The following options will be read by the MySQL Server. Make sure that
# you have installed the server correctly (see above) so it reads this 
# file.
#
# server_type=3
[mysqld]
skip-grant-tables

Note: after you are done with your work on skip-grant-tables, you should restore your file of C:\ProgramData\MySQL\MySQL Server 5.6\my.ini.

回答6:

if you are running on Apple MacBook OSX then:

Stop your MySQL server (if it is already running).
Find your MySQL configuration file, my.cnf. (For me it was placed @ /Applications/XAMPP/xamppfiles/etc. You can just search if you can't find it).
Open my.cnf file in any text editor.
Add "skip-grant-tables" (without quotes) at the end of [mysqld] section and save the file.
Now start your MySQL server. It'll start with skip-grant-tables option.

Do what you want now!!

PS: Please remove skip-grant-tables from my.cnf file once you are done with whatsoever you want to do ELSE MySQL server will always run without access grants.

回答7:

Use the following command (notice the "d"): mysqld --skip-grant-tables

回答8:

if this is a windows box, the simplest thing to do is to stop the servers, add skip-grant-tables to the mysql configuration file, and restart the server.

once you've fixed your permission problems, repeat the above but remove the skip-grant-tables option.

if you don't know where your configuration file is, then log in to mysql send SHOW VARIABLES LIKE '%config%' and one of the rows returned will tell you where your configuration file is.

回答9:

Edit my.ini file and add skip-grant-tables and restart your mysql server :

[mysqld]
port= 3306
socket = "C:/xampp/mysql/mysql.sock"
basedir = "C:/xampp/mysql" 
tmpdir = "C:/xampp/tmp" 
datadir = "C:/xampp/mysql/data"
pid_file = "mysql.pid"
# enable-named-pipe
key_buffer = 16M
max_allowed_packet = 1M
sort_buffer_size = 512K
net_buffer_length = 8K
read_buffer_size = 256K
read_rnd_buffer_size = 512K
myisam_sort_buffer_size = 8M
log_error = "mysql_error.log"
skip-grant-tables
# Change here for bind listening
# bind-address="127.0.0.1" 
# bind-address = ::1

回答10:

I'm in windows 10, using WAMP64 server. Searched for my.cnf and my.ini. Found my.ini in C:\wamp64\bin\mariadb\mariadb10.2.14.

Following the instructions from the colleagues:

Opened the quick start menu from Wampserver, selected 'Stop All Services'
Opened my.ini in a text editor, searched for [mysqld]
Added 'skip-grant-tables' at the end of the [mysqld] section (but within it)
Save the file, leave the editor open
In the Wampserver menu, select "Restart Services'. There will be a warning about the skip-grant-tables option
In the Wampserver menu select MySQL to open the prompt
It asked for a password, just press enter
Paste the command ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'newpassword';
It must report that the operation was successful (no tables affected)
In the my.ini file, erase the 'skip-grant-tables' line, save the file
In the WampServer menu, select once more Restart Service

Now you can enter with the new password. Thanks to all answers here.

回答11:

Please run this below command from the console to skip the user table verification while launching mysql database from command prompt

mysqld -skip-grant-tables

来源：https://stackoverflow.com/questions/1708409/how-to-start-mysql-with-skip-grant-tables

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