Dive – A Tool For Exploring Each Layer In A Docker Image

dive <your-image-tag>

dive build -t <some-tag> .

docker run --rm -it \
-v /var/run/docker.sock:/var/run/docker.sock \
-v "$(pwd)":"$(pwd)" \
-w "$(pwd)" \
-v "$HOME/.dive.yaml":"$HOME/.dive.yaml" \
wagoodman/dive:latest build -t <some-tag> .

Additionally you can run this in your CI pipeline to ensure you’re keeping wasted space to a minimum (this skips the UI):

CI=true dive <your-image>

This is beta quality! Feel free to submit an issue if you want a new feature or find a bug 🙂

Basic Features

Show Docker image contents broken down by layer

As you select a layer on the left, you are shown the contents of that layer combined with all previous layers on the right. Also, you can fully explore the file tree with the arrow keys.

Indicate what’s changed in each layer

Files that have changed, been modified, added, or removed are indicated in the file tree. This can be adjusted to show changes for a specific layer, or aggregated changes up to this layer.

Estimate “image efficiency”

The lower left pane shows basic layer info and an experimental metric that will guess how much wasted space your image contains. This might be from duplicating files across layers, moving files across layers, or not fully removing files. Both a percentage “score” and total wasted file space is provided.

Quick build/analysis cycles

You can build a Docker image and do an immediate analysis with one command: dive build -t some-tag .

You only need to replace your docker build command with the same dive build command.

CI Integration

Analyze an image and get a pass/fail result based on the image efficiency and wasted space. Simply set CI=true in the environment when invoking any valid dive command.

Multiple Image Sources and Container Engines Supported

With the --source option, you can select where to fetch the container image from:

dive <your-image> --source <source>

or

dive <source>://<your-image>

With valid source options as such:

• docker: Docker engine (the default option)
• docker-archive: A Docker Tar Archive from disk
• podman: Podman engine (linux only)

Installation

Ubuntu/Debian

wget https://github.com/wagoodman/dive/releases/download/v0.9.2/dive_0.9.2_linux_amd64.deb
sudo apt install ./dive_0.9.2_linux_amd64.deb

RHEL/Centos

curl -OL https://github.com/wagoodman/dive/releases/download/v0.9.2/dive_0.9.2_linux_amd64.rpm
rpm -i dive_0.9.2_linux_amd64.rpm

Arch Linux

Available as dive in the Arch User Repository (AUR).

yay -S dive

The above example assumes yay as the tool for installing AUR packages.

Mac

If you use Homebrew:

brew install dive

If you use MacPorts:

sudo port install dive

Or download the latest Darwin build from the releases page.

Windows

Download the latest release.

Go tools Requires Go version 1.10 or higher.

go get github.com/wagoodman/dive

Note: installing in this way you will not see a proper version when running dive -v.

Docker

docker pull wagoodman/dive

or

docker pull quay.io/wagoodman/dive

When running you’ll need to include the docker socket file:

<div class="highlight highlight-source-shell position-relative overflow-auto" data-snippet-clipboard-copy-content="docker run –rm -it \ -v /var/run/docker.sock:/var/run/docker.sock \ wagoodman/dive:latest “>

docker run --rm -it \
-v /var/run/docker.sock:/var/run/docker.sock \
wagoodman/dive:latest <dive arguments...>