ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' - Mariadb running on RHEL7

Situation : 
                  I have tried to login as root to MariaDB Database in Linux Server, Getting below error.

[root@nsk ~]# mysql -u root -p
Enter password:
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock'

Solution: 
                We need to recover the root password of mariadb. Follow the below steps to achieve root password recovery.

STEP 1 : Stop the mariadb service
[root@nsk ~]# systemctl stop mariadb.service
[root@nsk ~]#

STEP 2 : Run mysql in safe mode
[root@nsk ~]# mysqld_safe --skip-grant-tables &
[1] 8051
[root@nsk ~]# 180907 13:23:49 mysqld_safe Logging to '/var/log/mariadb/mariadb.log'.
180907 13:23:49 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql

STEP 3 : Login as root and select mysql db. Then reset root password.
[root@nsk ~]# mysql -u root -p
Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 1
Server version: 5.5.60-MariaDB MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> show databases;
+-------------------------------+
| Database                      |
+-------------------------------+
| information_schema     |
| company                       |
| mydb                             |
| mysql                            |
| performance_schema   |
| test                                |
+-------------------------------+
6 rows in set (0.00 sec)

MariaDB [(none)]> use mysql;
Database changed
MariaDB [mysql]> update user set password=PASSWORD("NewPassword") where User='root';
Query OK, 0 rows affected (0.00 sec)
Rows matched: 3  Changed: 0  Warnings: 0

MariaDB [mysql]>
MariaDB [mysql]> flush privileges;
Query OK, 0 rows affected (0.00 sec)

MariaDB [mysql]> quit
Bye

STEP 4 : Now stop and start the mariadb service and test the new password.

[root@nsk ~]# systemctl stop mariadb.service
[root@nsk ~]#
[root@nsk ~]# systemctl start mariadb.service
[root@nsk ~]#
[root@nsk ~]# mysql -u root -p
Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 5
Server version: 5.5.60-MariaDB MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]>

Hope it helps.