aws-ec2-summary.rb

#!/usr/bin/env ruby
# coding: utf-8
 
# usage: $0 [some options for `aws ec2`]
 
require 'json'
 
line_format = "%-19s %-23s %-11s %-15s %-15s %-12s %-16s %s"
line_length = 142
 
# command line
aws_cli_cmd = ["aws","ec2",ARGV,"describe-instances"].join(" ")
 
# header
puts line_format % [
       "InstanceID","Name","Status","PublicIP","PrivateIP","InstanceType","AvailabilityZone","LaunchTime"
     ]
puts "-" * line_length
 
# run aws cli and parse
JSON.parse(%x(#{aws_cli_cmd}))["Reservations"].each{|n|
  # ReservationId loop
  n["Instances"].each{|i|
    puts line_format % [
      i["InstanceId"],
      if i.has_key?("Tags") then i["Tags"].find{|tag| tag["Key"] == "Name" }["Value"] else "" end,
      i["State"]["Name"],
      if i.has_key?("PublicIpAddress")  then i["PublicIpAddress"]  else "" end,
      if i.has_key?("PrivateIpAddress") then i["PrivateIpAddress"] else "" end,
      i["InstanceType"],
      i["Placement"]["AvailabilityZone"],
      i["LaunchTime"]
    ]
  }
}
 
# footer
puts "-" * line_length
puts "%#{line_length}s" % [aws_cli_cmd]