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@mmm
Last active December 28, 2016 11:23
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checked used -vs- reserved instances in ec2
#!/usr/bin/ruby
# reports used -vs- reserved instances in ec2
#
# needs `{apt-get,brew} install awscli` with an `AWS_PROFILE` configured
require 'json'
def reserved_instances
JSON(`aws --profile=#{AWS_PROFILE} ec2 describe-reserved-instances`)["ReservedInstances"]
end
def active_reserved_instances
reserved_instances.select{ |instance| instance["State"] == "active" }
end
def active_reserved_instance_types
instance_types = Hash.new(0)
active_reserved_instances.each do |instance|
az = instance["AvailabilityZone"]
type = instance["InstanceType"]
count = instance["InstanceCount"]
unless instance_types.has_key?(az) then
instance_types[az] = Hash.new(0)
end
instance_types[az][type] += count
end
instance_types
end
def current_reservations
JSON(`aws --profile=#{AWS_PROFILE} ec2 describe-instances`)["Reservations"]
end
def current_instance_types
instance_types = Hash.new(0)
current_reservations.each do |reservation|
reservation["Instances"].each do |instance|
pg = instance["Placement"]
az = pg["AvailabilityZone"]
#az = instance["Placement"]["AvailabilityZone"]
type = instance["InstanceType"]
unless instance_types.has_key?(az) then
instance_types[az] = Hash.new(0)
end
instance_types[az][type] += 1
end
end
instance_types
end
def sorted(hash)
Hash[hash.sort_by(&:first)]
end
%w(us-west-2a us-west-2b us-west-2c).each do |az|
puts "for az #{az}:"
puts "reserved: #{sorted(active_reserved_instance_types[az])}"
puts " used: #{sorted(current_instance_types[az])}"
puts
end
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