Mongo connecting error Failed to connect to: *.*.201.18:27018:remote server has closed the Conne

The service uses the Redis+mongo cluster because the MONGO cluster machine memory is too small, so migrate to other larger space machines to do stress testing.

But after the machine migration, client call, found the following error

Mongo connecting error Failed to connect to: *.*.201.18:27018:remote Server has closed the connection

MONGO cannot connect, but test OK on the server side.

Looking for a long time to find an English information, said the client side of the MONGO extension also need to restart.

So quickly reboot PHP:

KILL-USR2 ' Cat/usr/local/php/var/run/php-fpm.pid '

The client refreshes the page and the error disappears.