Default password of mysql in ubuntu server 16.04

Question

I have installed ubuntu 16.04 server. Mysql server was installed by default in it. When I am trying to access the mysql with mysql -u root -p, I am unable to log in to mysql because I dont have the password. Is there any default password?

I have also tried with --skip-grant-tables, even this does not work. Even trying to log in with just mysql -u root is a failure.

Answer 1

This is what you are looking for:
sudo mysql --defaults-file=/etc/mysql/debian.cnf
MySql on Debian-base Linux usually use a configuration file with the credentials.

Answer 2

Mysql by default has root user's authentication plugin as auth_socket, which requires the system user name and db user name to be the same.

Specifically, log in as root or sudo -i and just type mysql and you will be logged in as mysql root, you can then create other operating users.

If you do not have a root on host, I guess you should not be allowed to login to mysql as root?

Answer 3

I had a fresh installation of mysql-server on Ubuntu 18.10 and couldn't login with default password. Then only I got to know that by default root user is authenticated using auth_socket. So as in the answer when the plugin changed to mysql_native_password, we can use mysql default password

$ sudo apt install mysql-server
$ sudo cat /etc/mysql/debian.cnf

You can find the following lines in there

user     = debian-sys-maint
password = password_for_the_user

Then:

$ mysql -u debian-sys-maint -p
Enter password: 

type the password from debian.cnf

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

+------------------+-----------+-----------------------+
| User             | Host      | plugin                |
+------------------+-----------+-----------------------+
| root             | localhost | auth_socket           |
| mysql.session    | localhost | mysql_native_password |
| mysql.sys        | localhost | mysql_native_password |
| debian-sys-maint | localhost | mysql_native_password |
+------------------+-----------+-----------------------+
4 rows in set (0.00 sec)

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

Either:

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'new_password';

Or:

// For MySQL 5.7+

mysql>UPDATE mysql.user SET authentication_string=PASSWORD('new_password') where user='root';

--Update--

Sometimes you will need to restart your mysql server.

sudo service mysql restart

or

sudo systemctl restart mysql

Answer 4

You can simply reset the root password by running the server with --skip-grant-tables and logging in without a password by running the following as root or with sudo:

service mysql stop
mysqld_safe --skip-grant-tables &
mysql -u root

mysql> use mysql;
mysql> update user set authentication_string=PASSWORD("YOUR-NEW-ROOT-PASSWORD") where User='root';
mysql> flush privileges;
mysql> quit

# service mysql stop
# service mysql start
$ mysql -u root -p

Answer 5

1. the first you should stop mysql
2. use this command sudo mysqld_safe --skip-grant-tables --skip-networking &
3. and then input mysql -u root try this way,I have been solved my problem with this method.

Answer 6

Although this is an old question, there are several of us still struggle to find an answer. At least I did. Please don't follow all the lengthy solutions. You could simply login to your mysql as root without providing any password (provided it is a fresh installation or you haven't changed the password since your installation) by adding sudo before your mysql command. $sudo mysql -uroot -p mysql> This is because mysql changed the security model in one of the latest versions.

Hope this helps

Answer 7

I think another place to look is /var/lib. If you go there you can see three mysql folders with 'interesting' permissions:

user   group 
mysql  mysql

Here is what I did to solve my problem with root password:

after running

sudo apt-get purge mysql*
sudo rm -rf /etc/mysql

I also ran the following (instead of my_username put yours):

cd /var/lib
sudo chown --from=mysql <my_username> mysql* -R
sudo rm -rf mysql*

And then:

sudo apt-get install mysql-server

which prompted me to select a new root password. I hope it helps

Answer 8

Simply run sudo dpkg-reconfigure mysql-server-5.7

You can find the version you have installed by running dpkg --get-selections | grep mysql-server

Answer 9

Note that in Ubuntu systems running MySQL 5.7 (and later versions), the root MySQL user is set to authenticate using the auth_socket plugin by default rather than with a password. you will need to switch its authentication method from auth_socket to mysql_native_password

as @BeNiza said, they changed the security model. I did following steps and it works for mysql 5.7.27 on ubuntu 18.04

sudo apt install mysql-server

The MySQL database software is now installed, but its configuration is not yet complete.

To secure the installation, MySQL comes with a script that will ask whether we want to modify some insecure defaults. Initiate the script by typing:

sudo mysql_secure_installation

you should press Y and hit the ENTER key at each prompt.

This will cause issues if you use a weak password

You can simply login to your mysql as root without providing any password by adding sudo before your mysql command.

sudo mysql

mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'your-password';

If you set a weak password you would see the following error:

ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

mysql> FLUSH PRIVILEGES;

mysql> exit

Note: After configuring your root MySQL user to authenticate with a password, you’ll no longer be able to access MySQL with the sudo mysql command used previously. Instead, you must run the following: mysql -u root -p

After entering the password you just set, you will see the MySQL prompt.