Unable to login (First time) after install mysql 5.7.16 - ERROR 1045 (28000): Access denied for user 'root'@'localhost'

Unable to login (First time) after install mysql  5.7.16

Problem:-

[root@exa1 ~]# mysql

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

[root@exa1 ~]#

[root@exa1 ~]# mysql -u root -p

Enter password:

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

[root@exa1 ~]# mysql -u root -p

Enter password:

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

Solution: -

[root@exa1 lib]# grep 'temporary password' /var/log/mysqld.log

2016-11-08T22:48:17.341024Z 1 [Note] A temporary password is generated for root@localhost: qPbmqbe5Mp#J

[root@exa1 ~]# mysql -u root -p

Enter password:

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 4

Server version: 5.7.16-log

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