Find out the instance id from within an ec2 machine

How can I find out, from within an ec2 machine (user root) what is my instance id?

From stackoverflow

• See this post - note that the IP address in the URL given is constant (which confused me at first), but the data returned is specific to your instance.

• See the EC2 documentation on the subject.

  Run:

  wget -q -O - http://169.254.169.254/latest/meta-data/instance-id
  

  If you need programatic access to the instance ID from within a script,

  die() { status=$1; shift; echo "FATAL: $*"; exit $status; }
  EC2_INSTANCE_ID="`wget -q -O - http://169.254.169.254/latest/meta-data/instance-id || die \"wget instance-id has failed: $?\"`"
  

  An example of a more advanced use (retrieve instance ID as well as availability zone and region, etc.):

  EC2_INSTANCE_ID="`wget -q -O - http://169.254.169.254/latest/meta-data/instance-id || die \"wget instance-id has failed: $?\"`"
  test -n "$EC2_INSTANCE_ID" || die 'cannot obtain instance-id'
  EC2_AVAIL_ZONE="`wget -q -O - http://169.254.169.254/latest/meta-data/placement/availability-zone || die \"wget availability-zone has failed: $?\"`"
  test -n "$EC2_AVAIL_ZONE" || die 'cannot obtain availability-zone'
  EC2_REGION="`echo \"$EC2_AVAIL_ZONE\" | sed -e 's:\([0-9][0-9]*\)[a-z]*\$:\\1:'`"
  

  You may also use curl instead of wget, depending on what is installed on your platform.

  Cheers, V.

  flybywire : works as advertised - great!