Missing /var/lib/mysql/mysql.sock file
You need to install the server package:
sudo yum install mysql-serverAfter installation, you have to start the service:
sudo service mysqld start
rm -rvf /var/lib/mysql/ib_logfile*touch /var/lib/mysql/mysql.socktouch /var/lib/mysql/mysql.pidchown -R mysql:mysql /var/lib/mysqlsystemctl restart mysqltry this and check the permission of both /var/lib/mysql/mysql.sock and /tmp
We faced a similar problem in my office setup with the same OS. The actual thing that was happening was low space on the server. It is quite strange, but i believe if the server gets full the files cannot be loaded or of some other resort. Please check to be sure the space on the server is enough else you have to try removing the installed mysql and reinstall. Best of luck.