Find region from EC2 instance

Question

Is there a way to find the scope of an instance from an instance?

I'm looking for something similar to an instance id lookup method.

Answer 1

This URL ( http://169.254.169.254/latest/dynamic/instance-identity/document ) no longer works. I get 404 when I tried to use it. I have the following code that seems to work though:

EC2_AVAIL_ZONE='curl -s http://169.254.169.254/latest/meta-data/placement/availability-zone' EC2_REGION="'echo \"$EC2_AVAIL_ZONE\" | sed 's/[az]$//''" 

Hope this helps.

EDIT: Improved sed based on comments

Answer 2

There is another way to achieve this:

 REGION=`curl http://169.254.169.254/latest/dynamic/instance-identity/document|grep region|awk -F\" '{print $4}'` echo $REGION us-east-1 

Answer 3

If you use jq , you can run the following:

 curl -s http://169.254.169.254/latest/dynamic/instance-identity/document | jq .region -r 

I think this is the cleanest way.

Answer 4

 ec2-metadata --availability-zone | sed 's/.$//' 

Answer 5

You can use ec2-metadata:

 ec2-metadata -z | grep -Po "(us|sa|eu|ap)-(north|south|central)?(east|west)?-[0-9]+" 

Answer 6

If you want to avoid regex, here you can do single-line code with Python:

 curl -s http://169.254.169.254/latest/dynamic/instance-identity/document | python -c "import json,sys; print json.loads(sys.stdin.read())['region']" 

Answer 7

The easiest thing I have found so far

  curl -s 169.254.169.254/latest/meta-data/placement/availability-zone | sed 's/.$//' 

Answer 8

very simple one liner

 export AVAILABILITY_ZONE=`wget -qO- http://instance-data/latest/meta-data/placement/availability-zone` export REGION_ID=${AVAILABILITY_ZONE:0:${#AVAILABILITY_ZONE} - 1} 

Answer 9

If you have jq installed, you can also go this way (perhaps the most "elegant" method) as follows:

 curl -s http://169.254.169.254/latest/dynamic/instance-identity/document | jq -c -r .region 

This simply returns the raw value of the "region" without any nice printing or other formatting. Link: AWS Forum

Answer 10

Get the area from the availability zone, delete the last letter of it.

 ec2-metadata -z | awk '{print $2}' | sed 's/[az]$//' 

Answer 11

Use JQ:

 curl -s http://169.254.169.254/latest/dynamic/instance-identity/document | jq -r .region 

Answer 12

If you can use the Java SDK, there is now a method that will return the current region name (for example, "us-east-1", "eu-west-1"):

http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/regions/Regions.html#getCurrentRegion ()

Answer 13

This is the cleanest solution I have found:

curl -s http://169.254.169.254/latest/dynamic/instance-identity/document |sed -n 's/ "region" : "\(.*\)"/\1/p'

eg.

export REGION=$(curl -s http://169.254.169.254/latest/dynamic/instance-identity/document |sed -n 's/ "region" : "\(.*\)"/\1/p')

• Does not make an API call, uses metadata of an EC2 instance
• Uses only curl and basic sed, so there are no SDK dependencies or tools that are unlikely to be installed.
• Doesn’t try to parse the availability zone name, so don’t worry if AWS changes the format of the name AZ / Region

Answer 14

Thanks to https://unix.stackexchange.com/a/144330/135640 with bash 4.2+ we can simply remove the last char from the availability zone:

 $ region=`curl -s 169.254.169.254/latest/meta-data/placement/availability-zone` $ region=${region::-1} $ echo $region us-east-1 

This assumes that AWS continues to use a single character for availability zones that are joined to the region.

Answer 15

Either do not make Ubuntu or this tool necessary and just do:

 : "${EBS_VOLUME_AVAILABILITY_ZONE:=$(curl -s http://169.254.169.254/latest/meta-data/placement/availability-zone)}" : ${EBS_VOLUME_REGION:="${EBS_VOLUME_AVAILABILITY_ZONE%%*([![:digit:]])}"} 

Answer 16

If you work with json - use the necessary tools. jq is much more powerful in this case.

 # curl -s curl -s http://169.254.169.254/latest/dynamic/instance-identity/document | jq -r '.region' eu-west-1 

Answer 17

2, which works as long as you use ec2.internal as your search domain:

 az=$(curl -s http://instance-data/latest/meta-data/placement/availability-zone) region=${az:0:${#az} - 1} 

Answer 18

For those who want to do this with a good old PowerShell

 $var = (curl http://169.254.169.254/latest/dynamic/instance-identity/document | Select-String-Pattern "Zone" | ConvertFrom-Json | Select-Object -ExpandProperty "region") echo $var 

Answer 19

This works for eu-central-1 as well as for various letter zones. (I don't have enough representatives to answer sed answer above)

 ec2-metadata --availability-zone | sed 's/[az]$//' 

Answer 20

If you are running Windows, you can use this single-line PowerShell:

 $region=(Invoke-RestMethod "http://169.254.169.254/latest/dynamic/instance-identity/document").region 

Answer 21

Also searched for a solution to find the region from the instance, and here is my clean Bash solution:

 az=$(curl -s http://169.254.169.254/latest/meta-data/placement/availability-zone) region=${az:0:${#az}-1} 

unless there are regions where AZ has more than two letters, which I do not know about.

Answer 22

You can use ec2-metadata to find out the EC2 information you are logged into.

You can install this tool by following this link. After installing the tool, you can run

# ec2-metadata -z

to find out the area.

These tools are installed with the latest (10.10) AMI Ubuntu,

Answer 23

If you want to get the region using JS, this should work:

 meta.request("/latest/meta-data/placement/availability-zone",function(err,data){ if(err) console.log(err); else{ console.log(data); str = data.substring(0, data.length - 1); AWS.config.update({region:str}); ec2 = new AWS.EC2(); } }); 

This mapping, found from AWS DOCS, in response to a metadata API call, just trimming the last character should work.

  eu-west-1a :eu-west-1 eu-west-1b :eu-west-1 eu-west-1c :eu-west-1 us-east-1a :us-east-1 us-east-1b :us-east-1 us-east-1c :us-east-1 us-east-1d :us-east-1 ap-northeast-1a :ap-northeast-1 ap-northeast-1b :ap-northeast-1 us-west-1a :us-west-1 us-west-1b :us-west-1 us-west-1c :us-west-1 ap-southeast-1a :ap-southeast-1 ap-southeast-1b :ap-southeast-1