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15 Cards in this Set
- Front
- Back
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What is a region defined as? |
A physical location/geographic area |
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What are Availability Zones? |
One of many locations inside a region, that houses a data centre |
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Which technology do regions and availability zones apply to? |
EC2 |
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Which resources are segregated into regions and availability zones? |
EC2 instances, and data |
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What is meant by a resource being global? |
It's an EC2 resource, that's tied to a region |
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What's the counterpart to this? |
When an EC2 resource is tied to an availability zone instead |
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Regions are completely isolated for fault tolerance - what is a side effect of this when working with EC2 resources? |
By default, you'll only see data for the region you are currently operating as. |
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How do I set up my EC2 instances with Elastic IP for a graceful failover? |
By placing EC2 instances in multiple availability zones - when there's a failure, we point the struggling instance to a different IP address but the hostname remains the same. |
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In which format are availability zones represented? Use Sydney and an availability zone of 'b'. |
Region, then a letter, e.g. for Australia (Sydney) we'd use ap-southeast-2b as the availability zone 'b' with for the region ap-southeast-2 |
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What is the important distinction between what you control and AWS controls in terms of availability zones? |
You specify a logical availability zone, but AWS specify the physical one - therefore different accounts may map to different physical availability zones. |
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What is the AZ-ID, and what is it used for? |
It's a canonical representation of a real availability zone. |
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What is the format of the AZ-ID? Use an example of availability zone 2 in (Australia/Sydney |
The region squashed down to just first letters/numbers, then az, then a number for the availability zone e.g apse-2-az2 would be Asia Pacific SouthEast-2 (Australia/Sydney) and availability zone 2 |
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When I deal with EC2 instances, I need to provide which parameter? |
The region endpoint |
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How do I find the regions available to my accounts EC2 instances using the CLI? |
aws ec2 describe-regions |
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How do I find the availability zone available to my accounts EC2 instances using the CLI? |
By specifying the region and using aws ec2 describe-availability-zones --region region-name |
