ubuntu@ip-172-31-45-140:~$ cd /var/run
ubuntu@ip-172-31-45-140:/var/run$ sudo cp mysqld/ mysqld.bc -rf
cp: cannot stat 'mysqld/': No such file or directory
ubuntu@ip-172-31-45-140:/var/run$ sudo chown mysql:mysql mysqld.bc/
chown: cannot access 'mysqld.bc/': No such file or directory
ubuntu@ip-172-31-45-140:/var/run$ sudo service mysql stop
ubuntu@ip-172-31-45-140:/var/run$ sudo cp mysqld.bc/ mysqld -rf
cp: cannot stat 'mysqld.bc/': No such file or directory
ubuntu@ip-172-31-45-140:/var/run$ sudo chown mysql:mysql mysqld -R
chown: cannot access 'mysqld': No such file or directory
ubuntu@ip-172-31-45-140:/var/run$ sudo /usr/sbin/mysqld --skip-grant-tables --skip-networking &
[1] 2614
ubuntu@ip-172-31-45-140:/var/run$ 180920 23:21:23 [Note] /usr/sbin/mysqld (mysqld 10.0.36-MariaDB-0ubuntu0.16.04.1) starting as process 2615 ...