How many EC2 instances can be used within Amazon VPC?

amazon-ec2 vpc amazon-vpc
shigeta picture shigeta · Oct 26, 2010 · Viewed 7k times · Source

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?

Answer

Till picture Till · Nov 28, 2010

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?:

You can run any number of Amazon EC2 instances within a VPC, so long as your VPC is appropriately sized to have an IP address assigned to each instance. You are initially limited to launching 20 Amazon EC2 instances per VPC at any one time and a maximum VPC size of /16 (65,536 IPs). If you would like to exceed these limits, please complete the following form.

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.

Related questions

How to connect to outside world from amazon vpc?

I have amazon VPC set through wizard as "public only network", so all my instances are in public subnet. Instances within VPC that have Elastic IP assigned connect to internet without any troubles. But instances without elastic IP can't connect …

Read More
Amazon ELB for EC2 instances in private subnet in VPC

I'm using Amazon EC2, and I want to put an internet-facing ELB (load balancer) to 2 instances on a private subnet. I am using VPC with public and private subnets. If I just add the private subnet to the ELB, it …

Read More
Amazon ELB in VPC

We're using Amazon EC2, and we want to put an ELB (load balancer) to 2 instances on a private subnet. If we just add the private subnet to the ELB, it will not get any connections, if we attach both subnets …

Read More