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

When i had been working with nginx, i got the issue "ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)" when i execute the following command:

$ mysql -u root 

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

To Fix the issue, i performed the bellow command:

1. Stop mysqld deamons.

$ sudo service mysql stop

2. Go to mysql/bin directory

$ cd /usr/bin

3. Start mysql deamons with option.

$ sudo mysqld_safe --skip-grant-tables

4. Open another terminal and open a mysql session to execute this:

$ mysql

mysql> use mysql;

mysql> UPDATE user SET password=PASSWORD('YOUR_NEW_PASSWORD_HERE') WHERE user = 'root';

mysql> exit;

5. Now kill the mysqld_safe process and restart mysqld normally:  

$ sudo service mysql start

That's it. Now you can access the mysql console :)

Fix: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

I have already apache web server installed. Then i am going to install nginx. After installation i gonna start nginx server but failed! and shows mw the following message:

nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

The issue is arise due to apache web server. Because i already run this within port 80. So the issue is fixed when i stop apache web server process and then start  again nginx web server. I followed the bellow command in terminal:

sudo service apache2 stop

sudo service nginx start

The above fixed my issue!