Can not connect to local MySQL server through socket ‘/tmp/mysql. sock (2)‘

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ERROR! The server quit without updating PID file（usr/local/mysql/data/rdp01.pid）

When starting the service , There have been such errors . Later, I copied this file to this path , It can be started , But it seems that the startup was unsuccessful , After various searches and attempts , Can not be resolved after the choice of reboot.
After reboot , I went straight to /usr/local/mysql/bin/ Start directly under the directory ./mysql start . After successful startup , open MySQL The times is wrong ,Can not connect to local MySQL server through socket '/tmp/mysql.sock (2)
I have tried many times , Also modified various ways , Finally, I saw that it might be a permission problem , I'll just give it to /tmp/ Increased permissions chmod 777 /tmp, I don't know whether it is right . Try starting again , Found that the startup was successful . But there is still a mistake , I don't know whether it has any impact