How do i retrieve instance metadata on aws ec2?

amurleopard

Link: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-metadata.html

The stored information about your ec2 instance can be accessed via the reserved IP URL.

The /latest mean the latest API.

$ 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
local-hostname
local-ipv4
mac
metrics/
network/
placement/
profile
public-hostname
public-ipv4
public-keys/
reservation-id
security-groups

An older API has less metadata available to it.

$ curl http://169.254.169.254/2007-01-19/meta-data/ 
ami-id
ami-launch-index
ami-manifest-path
hostname
instance-id
local-hostname
local-ipv4
public-hostname
public-ipv4
public-keys/
reservation-id

If defined when creating the instance user data can also be retrieved.