Listing EC2 instances in all regions

Tech

When working with EC2 instances across multiple regions I’ve found it’s near impossible to get a good overview of what is running where. This can be especially annoying when you are automatically launching a number of short lived instances.

To prevent me having to go through 9 different web pages to see what I currently have running I found it easier to just use the API and list active instances from the CLI.

Install dependencies:

$ gem install aws-sdk pmap

/usr/local/bin/aws-list:

#!/usr/bin/ruby

require 'aws-sdk'
require 'pmap'

def ec2(region = 'us-east-1')
ec2 = AWS::EC2.new(
access_key_id: ENV['AWS_ACCESS_KEY'],
secret_access_key: ENV['AWS_SECRET_KEY'],
region: region
)
ec2
end

def list_instances
instances = []
ec2.regions.peach do |region|
ec2.regions[region.name].instances.peach do |instance|
next if instance.status == :terminated
instances << instance
end
end
instances
end

list_instances.peach do |instance|
puts "#{instance.id}\t\t#{instance.availability_zone}\t\t#{instance.status}\t\t#{instance.ip_address}\n"
end

Listing instances:

$ export AWS_ACCESS_KEY="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
$ export AWS_SECRET_KEY="ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"
$ aws-list

i-16b78754 eu-west-1a running 54.77.218.113
i-0025e1e6 eu-west-1a running 54.76.129.127
i-3926e2df eu-west-1a running 54.154.52.146
i-4924e0af eu-west-1a running 54.154.52.77
i-c424e022 eu-west-1a running 54.72.131.127
i-0c25e1ea eu-west-1a running 54.154.51.140
i-9c25e17a eu-west-1a running 54.154.49.204
i-4b24e0ad eu-west-1a running 54.77.225.135
i-33e929f2 eu-central-1b running 54.93.164.233
i-c324e025 eu-west-1a running 54.76.98.165
i-3f26e2d9 eu-west-1a running 54.154.47.126
i-8027e366 eu-west-1a running 54.154.20.140
i-0d25e1eb eu-west-1a running 54.77.100.132
i-d718edd9 us-west-2c running 54.149.35.63
i-0c2028e6 us-east-1a running 54.164.193.104
i-5b95e54e sa-east-1a running 54.94.165.7
i-2dad38de ap-northeast-1a running 54.65.157.129
i-625a80af ap-southeast-1a running 54.169.195.201
i-a06e006f ap-southeast-2a running 54.66.184.34
i-2dbce5e5 us-west-1a running 54.67.67.18
Published