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A tool to investigate Route53, ELB, EC2 and Security Groups
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A tool to investigate Route53, ELB, EC2 and Security Groups

Gem Version


Add this line to your application's Gemfile:

gem install traceroute53


traceroute53 <domain>

To pass credentials, set environment variables or specify --profile=PROFILE option.

An example for healthy domain

Below is an example for healty domain. It show the ELB has a target instance and it can foward requests to it. Because the security group associated the instance allows LB's security group.

% traceroute53
hosted zone:
dns name:
load balancer: foo-aws-1 ["sg-0aaaaaaaaaaaaaa1", "sg-ccccccccccccccccc"]
listener[0]: port:443 arn:aws:elasticloadbalancing:us-east-1:567890123456:listener/app/foo-aws-1/7890123456789abc/0cdef01234567789
listener[0]action[0]: forward arn:aws:elasticloadbalancing:us-east-1:567890123456:targetgroup/foo-aws-1/89abcdef01234567
listener[0]action[0]target[0]: i-0cdef0123456789ab:8080 healthy
group_ids[0]: ["sg-09988776655443322", "sg-39393939"]
group_ids[0]sg[0]: sg-09988776655443322
group_ids[0]sg[0]ip[0]: port:8080 ["sg-ccccccccccccccccc"]
group_ids[0]sg[0]ip[1]: port:22 ["sg-05566778899aabbcc", "sg-f8e8d8c8"]
group_ids[0]sg[1]: sg-39393939
group_ids[0]sg[1]ip[0]: port:8080 ["sg-11223344"]
group_ids[0]sg[1]ip[1]: port:nil ["sg-f8f8f8f8"]
group_ids[0]sg[1]ip[2]: port:22 ["sg-33886655"]

An example for mismatched security groups

In this example Route53's hosted zone correctly have dns resource, which has correct dns_name, listener, target group but its 2nd security group's Permission set is empty.

% traceroute53
hosted zone:
dns name:
load balancer: bar-blah-aws-tokyo-1 ["sg-0eeddccbbaa998877", "sg-06665554443332221"]
listener[0]: port:443 arn:aws:elasticloadbalancing:ap-northeast-1:567890123456:listener/app/bar-blah-aws-tokyo-1/ef0123456789abcd/cccaaabbb9996667
listener[0]action[0]: forward arn:aws:elasticloadbalancing:ap-northeast-1:567890123456:targetgroup/bar-blah-atyo-1/fedcba9876543210
listener[0]action[0]target[0]: i-0cc123456789abcd:8080 unhealthy
group_ids[0]: ["sg-c57c55cc", "sg-0336699ccff003366"]
group_ids[0]sg[0]: sg-c57c55cc
group_ids[0]sg[0]ip[0]: port:8080 ["sg-99776655"]
group_ids[0]sg[0]ip[1]: port:nil ["sg-11335577"]
group_ids[0]sg[0]ip[2]: port:22 ["sg-fe87dc65"]
group_ids[0]sg[1]: sg-0336699ccff003366


After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to


Bug reports and pull requests are welcome on GitHub at


The gem is available as open source under the terms of the MIT License.

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