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Questions tagged [availability-zone]

77 questions
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How can I scale EC2 instances in ASG in Zone Sequence

How can I make sure ASG is scaling EC2 instances in a correct Zone sequence, i.e when I scale ASG from 3 instances to 5 instances, it needs to have 2 nodes in Zone-A, 2 in Zone-B and 1 in Zone-C. But in our case, it ends up in 2 nodes in Zone-A, 1…
Ravichandra
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Are AWS availability zone labels the same across time/users?

I'm trying to colocate my AWS instance with a website which, according to them, is hosted on availability zone ap-southeast-1c. I'm wondering if the 1c designation is stable over time and across users? I recall reading somewhere a long time ago…
ABC
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microservices with multiregion HA

when using microservices and microservice A wants to talk to microservice B there is some kind of loadbalancing as we can have multiple instances of B. it can be either infrastructure LB (kubernetes) or client side LB (eureka + ribbon). it's pretty…
piotrek
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Terraform ec2 module with conditional ebs device

We have a requirement to create a ec2 module and use it to create a ec2 instances (1 or more) + ebs device/ebs volume and use the same ec2 module to create ec2 (1 or more) w/o any ebs volumes. I tried it via conditional (count) but hitting all sorts…
iaav
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How to measure response time to different endpoints from different AWS regions?

Let's supposed I am running an API that are available via different endpoints, each being deploy in different data centres. For instance: ny.api.example.com (New York, US data centre) ln.api.example.com (London, UK data centre) sg.api.example.com…
dayuloli
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AWS Cloudformation Fn::GetAZs not working after timezone change

I am using AWS Cloudformation to create an application that deploys some instances inside a cluster with an Autoscaling group. I'm deploying it at us-east-1 The thing is that yesterday we changed to Summertime, and my script stopped working, giving…
Juan Rivillas
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Is there a allowed pattern regex to validate List

I wanted to have a regex to ensure user provides 2 elements to parameter which is List AvailabilityZones: Description: List of Availability Zones to use for the subnets in the VPC. Only two Availability Zones are used for this deployment,…
Sasi
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AZ mapping per user

I read "Each AWS Account has independently mapped AZs, which can vary between different accounts" in a book. As far as I know , each region has its well-defined AZs. So how does it come that the AZs vary from a user to another ?
loser8
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Instances not communicating across Availability Zones within a single region

I have the following instances, they are in the same VPC and region but different AZs, both of them are in the same SecurityGroup. Subnets: us-west-2a instance-a 172.31.32.0/20 us-west-2b instance-b 172.31.16.0/20 These two…
Danny D
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How do I ensure traffic remains restricted to an availability zone?

I'm looking at two sets of auto-scaled, load balanced, servers, owned by two aws clients, both deployed within the same availability zone and communicating over http. How do I make sure that the traffic between the two sets of servers doesn't go out…
blueberryfields
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openstack: The visibility of availability zone

Is it possible that one availability_zone/host_aggregate could be only used by only one specified project in openstack?
Alben Shao
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Running aws RDS MySQL in 3 AZs

I'm planning to run MySQL RDS. My question is Is it possible to run MySQL in 3 availability zones? Or is it only limited to 2 AZs. If it's running in 3AZs does it mean I get better redundancy compare with running in two AZs?
ljaerj
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Does Heroku standalone PostgreSQL available on Asia(Tokyo/Singapore) region?

I am building a service, and considering using of Heroku standalone PostgreSQL. Anyway I need to deploy the service to the Asian area (Tokyo/Singapore replicated), and I saw PostgreSQL is available only on US/EU region for Heroku dynos. I want to…
eonil
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How is Amazon EBS disk space shared across instances?

If a 2GB Amazon EBS volume is attached to 2 Amazon EC2 instances, is that EBS space divided per EC2 instance or is that space of 2GB is available for all of the EC2 instances?
user3048388
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How to access instances in the Availability Zone which is Down.?

There are two Availability Zone in a VPC, I would like to access instances which are in one Availability Zone when the other availability zones is down. Doesn't matter Private or Public instances.
roshni k
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