What is the default root pasword for MySQL 5.7

问题:

Cannot login to MySQL database after fresh install with root ID and empty/no password like other older MySQL versions do

回答1:

After you installed MySQL-community-server 5.7 from fresh on linux, you will need to find the temporary password from /var/log/mysqld.log to login as root.

1. grep 'temporary password' /var/log/mysqld.log
2. Run mysql_secure_installation to change new password

ref: http://dev.mysql.com/doc/refman/5.7/en/linux-installation-yum-repo.html

回答2:

There's so many answers out there saying to reinstall mysql or use some combo of

mysqld_safe --skip-grant-tables

and / or

UPDATE mysql.user SET Password=PASSWORD('password')

and / or something else ...

... None of it was working for me

---

Here's what worked for me, on Ubuntu 18.04, from the top

With special credit to this answer for digging me out of the frustration on this ...

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

Note the lines which read:

user     = debian-sys-maint
password = blahblahblah

Then:

$ mysql -u debian-sys-maint -p
Enter password: // type 'blahblahblah', ie. 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;  // When you don't have auto-commit switched on

Either:

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

Or:

// For MySQL 5.7+
UPDATE mysql.user SET authentication_string=PASSWORD('new_password') where user='root';

Then:

mysql> FLUSH PRIVILEGES;
mysql> COMMIT;  // When you don't have auto-commit switched on
mysql> EXIT

$ sudo service mysql restart
$ mysql -u root -p
Enter password: // Yay! 'new_password' now works!

回答3:

In case you want to install mysql or percona unattended (like in my case ansible), you can use following script:

# first part opens mysql log
# second part greps lines with temporary password
# third part picks last line (most recent one)
# last part removes all the line except the password
# the result goes into password variable

password=$(cat /var/log/mysqld.log | grep "A temporary password is generated for" | tail -1 | sed -n 's/.*root@localhost: //p')

# setting new password, you can use $1 and run this script as a file and pass the argument through the script

newPassword="wh@teverYouLikE"

# resetting temporary password

mysql -uroot -p$password -Bse "ALTER USER 'root'@'localhost' IDENTIFIED BY '$newPassword';"

回答4:

MySQL 5.7 changed the secure model: now MySQL root login requires a sudo

The simplest (and safest) solution will be create a new user and grant required privileges.

1. Connect to mysql

sudo mysql --user=root mysql

2. Create a user for phpMyAdmin

CREATE USER 'phpmyadmin'@'localhost' IDENTIFIED BY 'some_pass';
GRANT ALL PRIVILEGES ON *.* TO 'phpmyadmin'@'localhost' WITH GRANT OPTION;
FLUSH PRIVILEGES;

Reference - https://askubuntu.com/questions/763336/cannot-enter-phpmyadmin-as-root-mysql-5-7

回答5:

Mysql generates a default temporary password as it is installed so to use mysql firstly you would be required to get that password from the log file which is present at the /var/log/mysqld.log. So follow the following process -

grep 'temporary password' /var/log/mysqld.log

mysql_secure_installation - This is required to change the password for mysql and also to make certain other changes like removing temporary databases , allow or disallow remote access to root user , delete Anonymous users etc.

回答6:

I just installed Linux Mint 19 (based on Ubuntu 18.04) on my machine. I installed MySQL 5.7 from the repo (sudo apt install mysql-server) and surprisingly during installation, the setup didn't prompt to enter root password. As a result I wasn't able to login into MySQL. I googled here and there and tried various answers I found on the net, including the accepted answer above. I uninstalled (purging all dpkgs with mysql in its name) and reinstalled again from the default Linux Mint repositories. NONE works.

After hours of unproductive works, I decided to reinstall MySQL from the official page. I opened MySQL download page (https://dev.mysql.com/downloads/repo/apt) for apt repo and clicked Download button at the bottom right.

Next, run it with dpkg:

sudo dpkg -i mysql-apt-config_0.8.10-1_all.deb

At the installation setup, choose the MySQL version that you'd like to install. The default option is 8.0 but I changed it to 5.7. Click OK to quit. After this, you have a new MySQL repo in your Software Sources.

Update your repo:

sudo apt update

Finally, install MySQL:

sudo apt install mysql-server

And now I was prompted to provide root password! Hope it helps for others with this same experience.

回答7:

I to was experiencing the same problem and the only thing I was able to do to make it work was to go this route:

drop user admin@localhost; flush privileges; create user admin@localhost identified by 'admins_password'

This allowed me to recreate my username and enter a password for the user name

回答8:

In my case the data directory was automatically initialized with the --initialize-insecure option. So /var/log/mysql/error.log does not contain a temporary password but:

[Warning] root@localhost is created with an empty password ! Please consider switching off the --initialize-insecure option.

What worked was:

shell> mysql -u root --skip-password
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'new_password';

Details: MySQL 5.7 Reference Manual > 2.10.4 Securing the Initial MySQL Account

回答9:

None of these answers worked for me on Ubuntu Server 18.04.1 and MySQL 5.7.23. I spent a bunch of time trying and failing at setting the password and auth plugin manually, finding the password in logs (it's not there), etc.

The solution is actually super easy:

sudo mysql_secure_installation

It's really important to do this with sudo. If you try without elevation, you'll be asked for the root password, which you obviously don't have.

回答10:

It seems things were designed to avoid developers to se the root user, a better solution would be:

sudo mysql -u root

Then create a normal user, set a password, then use that user to work.

create user 'user'@'localhost' identified by 'user1234';
grant all on your_database.* to 'user'@'localhost';
select host, user from mysql.user;

Then try to access:

mysql -u user -p

Boom!