dive

README

dive

A tool for exploring a docker image, layer contents, and discovering ways to shrink your Docker image size.

To analyze a Docker image simply run dive with an image tag/id/digest:

dive <your-image-tag>

or if you want to build your image then jump straight into analyzing it:

dive build -t <some-tag> .

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 you docker build command with the same dive build command.

Installation

Ubuntu/Debian

wget https://github.com/wagoodman/dive/releases/download/v0.0.5/dive_0.0.5_linux_amd64.deb
sudo apt install ./dive_0.0.5_linux_amd64.deb

RHEL/Centos

wget https://github.com/wagoodman/dive/releases/download/v0.0.5/dive_0.0.5_linux_amd64.rpm
rpm -i dive_0.0.5_linux_amd64.rpm

Mac

brew tap wagoodman/dive
brew install dive

or download a Darwin build from the releases page.

Go tools

go get github.com/wagoodman/dive

Docker

docker pull wagoodman/dive

or

docker pull quay.io/wagoodman/dive

When running you'll need to include the docker client binary and socket file:

docker run --rm -it \
    -v /var/run/docker.sock:/var/run/docker.sock \
    -v $(which docker):/bin/docker \
    wagoodman/dive:latest <dive arguments...>