Current setup:

  • 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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1 answer

Hi @bramdevries93,

When did you create your hostname and DNS record? Usually, the propagation can take up to 24 hours so this behavior is expected at first.

Additionally, you’ll need to have a reverse DNS setup as well as this might slow you down. My best solution would be to use the IP address of your Droplet, unless of course you need SSL for some reason where the IP won’t be suitable.

Regards,
KFSys

  • When did you create your hostname and DNS record? Usually, the propagation can take up to 24 hours so this behavior is expected at first.

    The database (and the hostname) was created last week, so 24 hours had passed at the time.

    Additionally, you’ll need to have a reverse DNS setup as well as this might slow you down. My best solution would be to use the IP address of your Droplet, unless of course you need SSL for some reason where the IP won’t be suitable.

    I’m not entirely sure how this would solve the problem? If you meant that we should add the private IP address and the private hostname to the /etc/hosts file on our Droplet then that is was what we did. I’m just wondering if there are any downsides to doing this (what if the private IP changes, does it work for our standby node?)

    Our expectation with using managed databases was this this is not necessary.

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