Slow connection when using private hostname
- MySQL Managed Database.
- Droplet with our web server (nginx + php-fpm).
Both servers are hosted in the same network.
We recently ran into a problem when using a Managed MySQL database in a PHP application that is under higher load (200-300 requests / minute). Initially the requests were quiet fast but when the load increased the application became slower. We were able to trace this back to the part where we connect to our database using the private hostname.
Our problem appears to be fixed once we switched to using the private IP instead of the hostname. We suspected that there is some DNS resolution going on that caused the delay.
I’m wondering if this is a known issue and if there is a better way to fix it? For our Redis server we had a similar issue that was solved once we added the private IP and hostname to /etc/hosts.
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