CODEWITHSUNDEEP
rubyamazon-ec2aws-sdk
Simply Seth
Simply Seth

Reputation: 3506

listing EC2 instances by wildcard with Ruby

I want to list all instances that have a name containing loadtest.

I've tried various forms of filter and filters unsuccessfully What I have so far is:

ec2 = Aws::EC2::Client.new
ec2.describe_instances.each do |page|
  page.reservations.each do |reservation|
    reservation.instances.each do |instance|
      puts instance.tags
      puts instance.state
      puts instance.state.name
    end 
  end 
end

I wish to get a hash similar to :

{Name: loadtest-1west, id: <someid>, state: running}
{Name: loadtest-10west, id: <someid>, state: stopped}

Upvotes: 1

Views: 572

Answers (1)

Karen B
Karen B

Reputation: 2761

Assuming you're using the Name tag on your instances, the describe_instances call would look like this:

ec2.describe_instances({
  filters: [{ name: 'tag:Name', values: ['loadtest*'] }]
})

For tags, the filter name is tag:<name-of-tag>.

You can just iterate through the response and output the fields you want (example without pagination):

def name_tag(tags)
  name = tags.select {|t| t.key == 'Name'}
  name[0].value if name.length > 0
end

ec2.describe_instances({
  filters: [{ name: 'tag:Name', values: ['loadtest*'] }]
}).reservations.each do |reservation|
  reservation['instances'].each do |instance|
    name = name_tag(instance.tags)
    puts "{Name: #{name}, id: #{instance.instance_id}, state: #{instance.state.name}}"
  end
end

Upvotes: 4

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