===MySQL fault finding===

You might get ERROR 2002
%%
# mysql
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
%%

This may mean that mysql failed to start because you have bound mysql by using bind-address in my.cnf and have since changed the ip address or if you have used a hostname of localhost instead of 127.0.0.1 when using mysql via mysql SshPortForward.

(An IP address can change if you were running mysql in a vm, cloned it, generated a new UUID which creates a new MAC address which may cause your DHCP server to issue a new IP address)

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