AWS_ec2_InstanceData

Notes on how to get ec2 host's information from the command line and not getting into the aws console:

1. Login to the ec2 instance.

2. curl http://169.254.169.254/latest/meta-data/   [ This will show you all the system's meta-data that can be extracted using the command line:

example:

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

ami-id

ami-launch-index

ami-manifest-path

block-device-mapping/

hostname

instance-action

instance-id

instance-type

kernel-id

local-hostname

local-ipv4

mac

metrics/

network/

placement/

profile

public-hostname

public-ipv4

public-keys/

reservation-id

Further few of the above meta-data have few more sub values as:

block-device-mapping/   [ Over here you will get ec2 instance's disk information. ]

ami

ephemeral0

root

swap

metrics/

vhostmd   [ you will get some output like: <?xml version="1.0" encoding="UTF-8"?> ]

network/

interfaces/
macs/  [ network/interfaces/macs -> you will get the mac info [ same as user-data/mac ]

placement/

availability-zone   [ you will get the host's zone information example: us-east-1 ]

public-keys/

0=key_info

Further information about each of these meta data can be found at the following location:

http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/AESDG-chapter-instancedata.html

http://docs.aws.amazon.com/AWSEC2/2007-03-01/DeveloperGuide/AESDG-chapter-instancedata.html

This use a REST (RESTful) API or a web api to fetch system informations.

Following is a simple curl command to get most of the system details in a single line:

for i in `curl http://169.254.169.254/latest/meta-data/`; do echo ${i}; curl http://169.254.169.254/latest/meta-data/${i}/; echo -e '\n' ; done

I believe few of the following informations you might need handy: [ that you can create a small bash script and put that in your command path [ e.g. /bin/ as hostinfo.sh ]



echo "ami-id: "; curl http://169.254.169.254/latest/meta-data/ami-id/; echo -e "\n"
echo "hostname: "; curl http://169.254.169.254/latest/meta-data/hostname/; echo -e "\n"
echo "instance-type: "; curl http://169.254.169.254/latest/meta-data/instance-type/; echo -e "\n"
echo "local-hostname: "; curl http://169.254.169.254/latest/meta-data/local-hostname/; echo -e "\n"
echo "local-ipv4: "; curl http://169.254.169.254/latest/meta-data/local-ipv4/; echo -e "\n"
echo "mac: "; curl http://169.254.169.254/latest/meta-data/mac/; echo -e "\n"
echo "zone: "; curl http://169.254.169.254/latest/meta-data/placement/availability-zone/; echo -e "\n"
echo "public-hostname: "; curl http://169.254.169.254/latest/meta-data/public-hostname/; echo -e "\n"
echo "public-ipv4: "; curl http://169.254.169.254/latest/meta-data/public-ipv4/; echo -e "\n"
echo "public-keys: "; curl http://169.254.169.254/latest/meta-data/public-keys/; echo -e "\n"
echo "security-group: "; curl http://169.254.169.254/latest/meta-data/security-groups/; echo -e "\n"

vi publicip

curl http://169.254.169.254/latest/meta-data/public-ipv4/; echo -e "\n"


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