get ec2 instances with a certain tag using aws sdk

Question

I am trying to figure out what is the best way to get a list of ec2 instances with a certain tag for example "testing" using the ruby aws sdk.

ec2 = AWS::EC2.new(:access_key_id => "XXXXXXXXXXXXX", :secret_access_key => "YYYYYYYYY")
ec2list = ec2.instances.filter("Name", "testing)

This does not seem to work for some reason. It was thinking it will filter out the collection and just give me instances with tag testing. Is there a way to do this using the ruby sdk? thank you.

Answer 1

If you want the tag "Name" with the value of "testing" use:

instances = resource.instances(
  filters: [
    { 
      name: 'tag:Name',
      values: ["testing"] 
    }
  ]
)

For all instances with a tag key of "testing" the following is used.

instances = resource.instances(
  filters: [
    { 
      name: 'tag:Key',
      values: ["testing"] 
    }
  ]
)

See the #instances docs for more filter options.

Answer 2

This worked for me:

ec2.instances.tagged("testing")