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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.
881
The most common reason for no public IP address for your EC2 instance is that you are launching your EC2 instance using a private subnet. A private subnet means any EC2 instances located in that subnet aren't directly addressable from the public web.
For EC2 instances in a public subnet you will need an IP to receive web traffic. For security, make sure the security group associated with the public EC2 instance only allows traffic on the required ports.
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
curl http://checkip.amazonaws.com
this returns the public ip address.
44
If you are inside the instance -
$ curl icanhazip.com
162.202.17.123
here is one more way
$ curl -s ifconfig.me
162.202.17.123
these methods are not limited to just AWS.
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