AWS/Ec2MetaData

• https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instancedata-data-retrieval.html

• Get TOKEN env var and then list of endpoints

  TOKEN=`curl -sS -X PUT "http://169.254.169.254/latest/api/token" -H "X-aws-ec2-metadata-token-ttl-seconds: 21600"`
  echo "TOKEN=$TOKEN"
  curl -H "X-aws-ec2-metadata-token: $TOKEN" -v http://169.254.169.254/latest/meta-data/

• Use TOKEN env to get hostname

  # for debug replace -sS with -v
  curl -H "X-aws-ec2-metadata-token: $TOKEN" -sS http://169.254.169.254/latest/meta-data/local-hostname ; echo
  curl -H "X-aws-ec2-metadata-token: $TOKEN" -sS http://169.254.169.254/latest/meta-data/public-hostname ; echo

• Use TOKEN to get tags (Tags not available by default, have to enable see --metadata-options "InstanceMetadataTags=enabled"

  TOKEN=`curl -sS -X PUT "http://169.254.169.254/latest/api/token" -H "X-aws-ec2-metadata-token-ttl-seconds: 21600"`
  echo "TOKEN=$TOKEN"
  ## Check for tags
  curl -H "X-aws-ec2-token: $TOKEN" -sS http://169.254.169.254/latest/meta-data/ | grep "tags" || ( echo "no tags exit=$? in metadata, InstanceMetadataTags not enabled for this instance ?")
  #
  curl -H "X-aws-ec2-metadata-token: $TOKEN" -sS http://169.254.169.254/latest/meta-data/tags/instance

• Get account number from aws meta-data (search with jq or grep)

  TOKEN=`curl -sS -X PUT "http://169.254.169.254/latest/api/token" -H "X-aws-ec2-metadata-token-ttl-seconds: 21600"`
  echo "TOKEN=$TOKEN"
  curl -s http://169.254.169.254/latest/dynamic/instance-identity/document ; echo

  • Online grep for account using linux

    curl -s http://169.254.169.254/latest/dynamic/instance-identity/document | grep -oP '"accountId"\s*:\s*"\K[^"]+'