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Please have a look at these links: https://forums.aws.amazon.com/message.jspa?messageID=320196 https://aws.amazon.com/premiumsupport/knowledge-center/rds-mysql-functions/


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[ec2_master].compute.amazonaws.com looks like the hostname for a public IP address. You should be using the private IP address of the EC2 machine, inside VPC. RDS instances may not have access to the VPC's DNS resolver, which would otherwise cause the public hostname to resolve to the private IP address for queries that originate from inside, if the VPC is ...


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Looks like it was a problem with HHVM, and not Laravel or RDS/MySQL. I installed PHP 7 instead, and now it works. Strange...


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The item "regional data transfer - in/out/between EC2 AZs or using IPs or ELB" accounts for data transfer: Between EC2 instances not using the private IP Between EC2 instances on different availability zones Between EC2 instances and ELBs If your cost for "regional data transfer - in/out/between EC2 AZs or using IPs or ELB" is $151.48, then that means ...


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I wouldn't recommend using the RDS DNS domain in my application config ie *.rds.amazonaws.com Set up a private DNS zone in Route53 instead. This is only available within your VPC, so you don't need to register it publicly or anything like that. Then, set up CNAME records for your DB instances, which point to the RDS domain. Set very low TTLs (< 30s). ...



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