ec2-metadata

$ ec2-metadata 
ami-id: ami-xxxxxxxxxxxx
ami-launch-index: 0
ami-manifest-path: (unknown)
ancestor-ami-ids: not available
block-device-mapping: 
	 ami: xvda
	 root: /dev/xvda
instance-id: i-xxxxxxxxxxxxx
instance-type: t3.medium
local-hostname: ip-xxxxxxx.ap-northeast-1.compute.internal
local-ipv4: xxxxxxxx
kernel-id: not available
placement: ap-northeast-1a
product-codes: not available
public-hostname: not available
public-ipv4: xxxxxxx
public-keys: 
not available
ramdisk-id: not available
reservation-id: r-xxxxxxxxx
security-groups: role_xxxxx
user-data: not available
$ ec2-metadata --help
ec2-metadata v0.1.2
Use to retrieve EC2 instance metadata from within a running EC2 instance. 
e.g. to retrieve instance id: ec2-metadata -i
		 to retrieve ami id: ec2-metadata -a
		 to get help: ec2-metadata --help
For more information on Amazon EC2 instance meta-data, refer to the documentation at
http://docs.amazonwebservices.com/AWSEC2/2008-05-05/DeveloperGuide/AESDG-chapter-instancedata.html

Usage: ec2-metadata <option>
Options:
--all                     Show all metadata information for this host (also default).
-a/--ami-id               The AMI ID used to launch this instance
-l/--ami-launch-index     The index of this instance in the reservation (per AMI).
-m/--ami-manifest-path    The manifest path of the AMI with which the instance was launched.
-n/--ancestor-ami-ids     The AMI IDs of any instances that were rebundled to create this AMI.
-b/--block-device-mapping Defines native device names to use when exposing virtual devices.
-i/--instance-id          The ID of this instance
-t/--instance-type        The type of instance to launch. For more information, see Instance Types.
-h/--local-hostname       The local hostname of the instance.
-o/--local-ipv4           Public IP address if launched with direct addressing; private IP address if launched with public addressing.
-k/--kernel-id            The ID of the kernel launched with this instance, if applicable.
-z/--availability-zone    The availability zone in which the instance launched. Same as placement
-c/--product-codes        Product codes associated with this instance.
-p/--public-hostname      The public hostname of the instance.
-v/--public-ipv4          NATted public IP Address
-u/--public-keys          Public keys. Only available if supplied at instance launch time
-r/--ramdisk-id           The ID of the RAM disk launched with this instance, if applicable.
-e/--reservation-id       ID of the reservation.
-s/--security-groups      Names of the security groups the instance is launched in. Only available if supplied at instance launch time
-d/--user-data            User-supplied data.Only available if supplied at instance launch time.

便利・・・だけど、ec2-metadataに関する記事が引っかからないのは・・・deprecated？？？