What are the eight life cycle hook functions of Vue>>>

1. After modifying 504 error, 502 error appears

The 2.502 error was supposed to be caused by the configuration problems of nginx or PHP FPM, but it was not caused by these problems

3. Later, it was found that MySQL could not connect, and there was MySQL error 1040 (HY000): too many connections error

Solution: there are modifications and no additions

set-variable = max_ connections=1000

4. Restart MySQL/etc/init.d/mysql restart

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