Amazon VPC 中可以使用多少个 EC2 实例？
Amazon 的 Virtual Private Cloud (Amazon VPC) 允许我打开与 EC2 集群的 VPN 连接。
看起来您可以在虚拟私有云中运行的 EC2 实例数量是 24 个主机 - 这是正确的吗？
Amazon's Virtual Private Cloud (Amazon VPC) allows me to open a VPN connection to the EC2 cluster.
It looks like the number of EC2 instances you can run within a virtual private cloud is 24 hosts - is that correct?
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更新
最初答案中提到的测试版限制同时已取消，新的限制（可以按照概述提出）由相应的常见问题解答 我可以在 VPC 中使用多少个 Amazon EC2 实例？：
此外，每个区域的初始 VPC 数量为 5，每个 VPC 的初始子网数量为 20，请参阅附录 B：限制 了解有关这些限制和其他限制的详细信息。
初步解答
目前，每个 AWS 账户可以拥有 1 个 VPC，最多可包含 20 个子网。这些是测试版限制，如果您需要解除这些限制，请填写表单。
使用单个 AWS 账户运行的实例也有限制，但同样，您可以让它们达到此限制。 AWS 有各种限制，包括 EBS 卷、弹性 IP 等。它们都可以提高。
Update
The beta limitations mentioned in the initial answer have meanwhile been lifted, the new ones (which can be raised as outlined) are addressed by the respective FAQ How many Amazon EC2 instances can I use within a VPC?:
Furthermore, the initial Number of VPCs per region is 5 and the initial Number of subnets per VPC is 20, see Appendix B: Limits for details regarding these and other limitations in place.
Initial Answer
You can currently have 1 VPC per AWS account with up to 20 subnets. These are the beta limitations, complete their form if you need to lift them.
There is also a limit of instances you can run with a single AWS account, but again -- you can get them to up this limit. AWS has all kinds of limits in place, also on EBS volumes, elastic IPs, etc.. They can all be upped.
事情已经改变了。
来源：
http://aws.amazon.com/ec2/faqs/#How_many_instances_can_I_run_in_Amazon_EC2
Things Have Changed.
Source:
http://aws.amazon.com/ec2/faqs/#How_many_instances_can_I_run_in_Amazon_EC2
我非常怀疑。我的理解是，VPC 只是一个 VPN，您可以通过管道传输尽可能多的流量。您是否混淆了主机和子网？可用子网的数量有限制。主机数量也有限制（我认为最多 20 台主机），但这是 EC2 的普遍问题，并非特定于 VPC。请注意，如果您向亚马逊发送电子邮件，这两个限制都可以被推翻。
I highly doubt it. My understanding is that VPC is just a VPN, where you can tunnel as much traffic as it can support through the pipe. Are you confusing hosts with subnets? There is a restrictions on the number of subnets available. There is also a restriction on the number of hosts (I think it's a max of 20 hosts), but that's a general EC2 concern and not specific to VPC. Note that both restrictions can be overturned if you send an email to Amazon.
这取决于实例的类型。使用以下说明检查您的限制：https:// docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-resource-limits.html
It depends on the type of the instance. Check your limits using the following instruction: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-resource-limits.html