Dive: A tool for exploring a docker image, layer contents
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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 your docker build
command with the same dive build
command.
Installation
Ubuntu/Debian
wget https://github.com/wagoodman/dive/releases/download/v0.3.0/dive_0.3.0_linux_amd64.deb sudo apt install ./dive_0.3.0_linux_amd64.deb
RHEL/Centos
wget https://github.com/wagoodman/dive/releases/download/v0.3.0/dive_0.3.0_linux_amd64.rpm rpm -i dive_0.3.0_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 \ wagoodman/dive:latest <dive arguments...>
Docker for Windows (showing PowerShell compatible line breaks; collapse to a single line for Command Prompt compatibility)
docker run --rm -it ` -v /var/run/docker.sock:/var/run/docker.sock ` wagoodman/dive:latest <dive arguments...>
Note:depending on the version of docker you are running locally you may need to specify the docker API version as an environment variable:
DOCKER_API_VERSION=1.37 dive ...
or if you are running with a docker image:
docker run --rm -it \ -v /var/run/docker.sock:/var/run/docker.sock \ -e DOCKER_API_VERSION=1.37 wagoodman/dive:latest <dive arguments...>
KeyBindings
Key Binding Description Ctrl + C Exit Tab or Ctrl + Space Switch between the layer and filetree views Ctrl + F Filter files Ctrl + A Layer view: see aggregated image modifications Ctrl + L Layer view: see current layer modifications Space Filetree view: collapse/uncollapse a directory Ctrl + A Filetree view: show/hide added files Ctrl + R Filetree view: show/hide removed files Ctrl + M Filetree view: show/hide modified files Ctrl + U Filetree view: show/hide unmodified files PageUp Filetree view: scroll up a page PageDown Filetree view: scroll down a pageConfiguration
No configuration is necessary, however, you can create a config file and override values:
log: enabled: true path: ./dive.log level: info # Note: you can specify multiple bindings by separating values with a comma. # Note: UI hinting is derived from the first binding keybinding: # Global bindings quit: ctrl+c toggle-view: tab, ctrl+space filter-files: ctrl+f, ctrl+slash # Layer view specific bindings compare-all: ctrl+a compare-layer: ctrl+l # File view specific bindings toggle-collapse-dir: space toggle-added-files: ctrl+a toggle-removed-files: ctrl+r toggle-modified-files: ctrl+m toggle-unmodified-files: ctrl+u page-up: pgup page-down: pgdn diff: # You can change the default files show in the filetree (right pane). All diff types are shown by default. hide: - added - removed - changed - unchanged filetree: # The default directory-collapse state collapse-dir: false # The percentage of screen width the filetree should take on the screen (must be >0 and <1) pane-width: 0.5 layer: # Enable showing all changes from this layer and ever previous layer show-aggregated-changes: false
dive will search for configs in the following locations:
~/.dive.yaml $XDG_CONFIG_HOME/dive.yaml ~/.config/dive.yaml
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