Get Public IP Address on current EC2 Instance

Using Amazon CLI, is there a way to get the public ip address of the current EC2? I'm just looking for the single string value, so not the json response describe-addresses returns.

Solution

UPDATE: This answer assumes the instance is configured with Instance Metadata Service v1 (IMDSv1). For v2, see the comments below.

The AWS Command-Line Interface (CLI) can be used to return information on any/all Amazon EC2 instances, eg:

$ aws ec2 describe-instances --instance-ids i-0c9c9b44b --query 'Reservations[*].Instances[*].PublicIpAddress' --output text

54.232.200.77

If you are seeking information about the EC2 instance from which you are executing the command, then the current IP address can be obtained via the instance metadata service:

$ curl http://169.254.169.254/latest/meta-data/

ami-id
ami-launch-index
ami-manifest-path
block-device-mapping/
hostname
iam/
instance-action
instance-id
instance-type
local-hostname
local-ipv4
mac
metrics/
network/
placement/
profile
public-hostname
public-ipv4
public-keys/
reservation-id
security-groups
services/

So, the private IP address is available via:

$ curl http://169.254.169.254/latest/meta-data/local-ipv4

172.31.10.221

The public IP address is available via:

$ curl http://169.254.169.254/latest/meta-data/public-ipv4

54.232.200.77