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I am running a single instance t1.micro to host centos with an open source erp program Now I wish to also host another instance with a 2nd erp program. Will this be within my free tier limit.
Is there a count on the no# of instance I can use / start?
How many elastic Ip's can I associate?
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Q: How many instances can I run in Amazon EC2? You are limited to running On-Demand Instances per your vCPU-based On-Demand Instance limit, purchasing 20 Reserved Instances, and requesting Spot Instances per your dynamic Spot limit per region.
When your Free Tier period with AWS expires, you can continue to use services or stop using services. If you continue using AWS services, then all resources on your account are billed at On-Demand rates.
AWS Budgets has a Free Tier limit of 62 budget days per month, so creating a single budget falls within the AWS Free Tier limit. As the name implies, AWS Free Tier-eligible service usage is free.
Your eligibility for the AWS Free Tier expires 12 months after you first create your account. You can't extend your Free Tier eligibility after this time. You can continue to use Always Free offers, even after your Free Tier eligibility expires. To learn more about available Always Free offers, see AWS Free Tier .
For Question #1: Number of Instances
Amazon charges based on hours of usage, not based on number of instances you are running. Check this Amazon AWS Free tier details.
They have clearly mentioned that the free tier includes:
750 hours of Amazon EC2 Linux/UNIX or RHEL or SLES Micro Instance usage (613 MB of memory and 32-bit and 64-bit platform support) – enough hours to run continuously each month*
750 hours of Amazon EC2 Microsoft Windows Server‡ Micro Instance usage (613 MB of memory and 32-bit and 64-bit platform support) – enough hours to run continuously each month*
750 hours of an Elastic Load Balancer plus 15 GB data processing*
30 GB of Amazon Elastic Block Storage, plus 2 million I/Os and 1 GB of snapshot storage
For Question #2: Elastic IP addresses
Allocating and using one Elastic IP addresses per instance is basically free, except if the Elastic IP address is not currently associated with an instance, see section Elastic IP Addresses on page Amazon EC2 Pricing:
$0.00 for one Elastic IP address associated with a running instance $0.005 per additional Elastic IP address associated with a running instance per hour on a pro rata basis $0.005 per Elastic IP address not associated with a running instance per hour on a pro rata basis $0.00 per Elastic IP address remap for the first 100 remaps per month $0.10 per Elastic IP address remap for additional remaps over 100 per month It says,
750 hours of Amazon EC2 Linux/UNIX or RHEL or SLES Micro Instance usage (613 MB of memory and 32-bit and 64-bit platform support)
To clarify, if you have 2 EC2 instances run 24/7, that will make them a total of 1,488 hours in 31 days (1 month)
24 hrs * 31 days = 744 hours. 744 hours * 2 instances = 1,488 hours If you don't want to pay an excess. Your 2 instances would only last around 15 days so it won't exceed 750 hours allocation per month.
Furthermore, this free tier expires in 12 month and only for new customers following your AWS sign-up date.
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