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Interactive visualizations of Terraform dependency graphs

Project description

# Blast Radius

[![PyPI version](](

*Blast Radius* is a tool for reasoning about *Terraform* dependency graphs with interactive visualizations. Use *Blast Radius* to:
* **Learn** about *Terraform* or one of its cloud providers, through [example configurations](
* **Document** your infrastructure
* **Reason** about relationships between resources, and evaluate changes to them.

<img src="doc/blastradius-interactive.png">

* **Interact** with this diagram (and many others) [here](

# Quickstart

Install *Blast Radius* with pip, and *Graphviz* through your system's package manager.

[...]$ pip3 install BlastRadius
[...]$ brew install graphviz

Point *Blast Radius* at an `init-ed` *Terraform* project, and connect with your browser.

[...]$ blast-radius --serve /path/to/terraform-project
* Running on (Press CTRL+C to quit)
## Docker
*Alternatively*, you can launch *Blast Radius* in a docker container. (In this example, the current working directory contains a *Terraform* project.)

[...]$ docker run --cap-add=SYS_ADMIN -it --rm -p 5000:5000 -v $(pwd):/workdir:ro 28mm/blast-radius

*Please note*: because terraform saves module links as _absolute_ paths in _.terraform/modules/<uuid>_ we mount the host's filesystem read-only and force terraform to update the modules path at start. This way we don't interfere with the real project. Thus docker has to be run with the `--cap-add=SYS_ADMIN` flag to use the [overlayFS]( see [Docker's documentation](

*Additional note*:
If you organised your terraform directories with stacks and modules, please call *Blast Radius* from the root directory and give the stack's directory as argument (plus the `--serve` argument).

[...]$ tree -d
/-- project
|-- modules
| |-- foo
| |-- bar
| `-- dead
`-- stacks
`-- beef
`-- .terraform

[...]$ cd project
docker run --cap-add=SYS_ADMIN -it --rm -p 5000:5000 -v $(pwd):/workdir:ro 28mm/blast-radius --serve stacks/beef
# Embedded Figures

You may wish to embed figures produced with *Blast Radius* in other documents. You will need the following:

1. an `svg` file and `json` document representing the graph and its layout.
2. `javascript` and `css` found in `.../blastradius/server/static`
3. a uniquely identified DOM element, where the `<svg>` should appear.

Further details available [here](doc/

# Implementation Details

*Blast Radius* uses the [*Graphviz*]( package to layout graph diagrams, [*PyHCL*]( to parse [*Terraform*]( configurations, and [*d3.js*]( to implement interactive features and animations.

# Further Reading

The development of *Blast Radius* is documented in a series of [blog]( posts:

* [part 1]( motivations, d3 force-directed layouts vs. vanilla graphviz.
* [part 2]( d3-enhanced graphviz layouts, meaningful coloration, animations.
* [part 3]( limiting horizontal sprawl, supporting modules.
* [part 4]( search, pan/zoom, prune-to-selection, docker.

A catalog of example *Terraform* configurations, and their dependency graphs can be found [here](

* [AWS two-tier architecture](
* [AWS networking (featuring modules)](
* [Google two-tier architecture](
* [Azure load-balancing with 2 vms](

These examples are drawn primarily from the `examples/` directory distributed with various *Terraform* providers, and aren't necessarily ideal. Additional examples, particularly demonstrations of best-practices, or of multi-cloud configurations strongly desired.

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