Can't connect to Mysql installation on Centos 7 - mysql

Question

Install MySQL using mysql57-community-release-el7-7.noarch.rpm
started the MySQL server using service mysqld start
when I try to connect MySQL or any other client app on the localhost I get.
ERROR 1045 (28000): Access denied for user 'root'#'localhost' (using password: NO)
I never set an admin password not sure what is the default and what am I missing.

Answer 1

First you will have to reset the password,in some cases theres no need to enter any password simply press Enter when prompted and then you can change the password using ALTER USER command,but if it doesn't works Go through the following procedure,
First you will have to get the temporary password , type in the terminal :
grep 'temporary password' /var/log/mysqld.log
You will get a temporary password at the end of the sentence, login to mysql using that temporary password as
mysql -u root -p
Enter Password : (Enter you Temporary password Here)
Now you will have to change the default password, for that you will have to go through some rules.
NOTE: Type the following command inside mysql
mysql> SHOW VARIABLES LIKE 'validate_password%';
You will get a table like :
+--------------------------------------+--------+
| Variable_name | Value |
+--------------------------------------+--------+
| validate_password_dictionary_file | |
| validate_password_length | 8 |
| validate_password_mixed_case_count | 1 |
| validate_password_number_count | 1 |
| validate_password_policy | MEDIUM |
| validate_password_special_char_count | 1 |
+--------------------------------------+--------+
For minimal validation, type(optional you can change it anytime)
mysql> SET GLOBAL validate_password_length=6;
mysql> SET GLOBAL validate_password_policy=LOW;
This will check for minimum 6 digit password
Now you can change the default password,
For E.g if you want to set 123456 as your new password
mysql> ALTER USER 'root'#'localhost' IDENTIFIED BY '123456';
Hope it will solve your problem.

Answer 2

Check /var/log/messages for more details.