dongtangu6889 2018-07-22 19:41
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AWS RDS DB在部署时会变慢

I'm trying to implement a CMS on AWS using mostly free tier services and am doing so using PHP, and have already implemented this using PHPMyAdmin in school.

The problem:

I wanted to do this using RDS, but I've come up with a pretty strange issue.

When I upload my site to Elastic Beanstalk and try to connect to the DB from there, I face incredibly long wait times. Sometimes it returns error 504 from long wait times.

This is not an issue with the Database's speed, however. I know this because I can run this code on localhost and it works exactly as intended (see photo)

Speed on localhost

Only half a second to load!

What I think is happening:

Something must be going on while it's being executed in Elastic Beanstalk. I don't know quite what, but it's taking way too long.

Extra info:

I connect to the DB using the following code (credentials are spoofed):

$conn = mysqli_connect("","USERNAME","PASSWORD","mydb");

Both my database and EL instance are run from ca-central. The connection is not failing, it is taking an extreme amount of time.

the page that is failing is

If you have any ideas on what it could be, I would appreciate it very much. Thanks!


I will post certain bits of my code, but creating an MCVE is really not feasible as I would have to give my DB password, and you would need to re-create my AWS environment, so please don't ask for one, I can always give more detail.

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  • duansha6410 2018-07-22 22:51

    After @colde mentioned checking logs, I quickly found an error code which lead me to the right resources.

    My database was only configured to allow connections from my IP, and the firewall was blocking out my Elastic Beanstalk instance, I just had to add a new security rule.


    本回答被题主选为最佳回答 , 对您是否有帮助呢?



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