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https://github.com/wagoodman/dive

A tool for exploring each layer in a docker image
https://github.com/wagoodman/dive

cli docker docker-image explorer inspector tui

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A tool for exploring each layer in a docker image

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README 

        
# dive

[![GitHub release](https://img.shields.io/github/release/wagoodman/dive.svg)](https://github.com/wagoodman/dive/releases/latest)

[![Validations](https://github.com/wagoodman/dive/actions/workflows/validations.yaml/badge.svg)](https://github.com/wagoodman/dive/actions/workflows/validations.yaml)

[![Go Report Card](https://goreportcard.com/badge/github.com/wagoodman/dive)](https://goreportcard.com/report/github.com/wagoodman/dive)

[![License: MIT](https://img.shields.io/badge/License-MIT%202.0-blue.svg)](https://github.com/wagoodman/dive/blob/main/LICENSE)

[![Donate](https://img.shields.io/badge/Donate-PayPal-green.svg?style=flat)](https://www.paypal.me/wagoodman)



**A tool for exploring a docker image, layer contents, and discovering ways to shrink the size of your Docker/OCI image.**



![Image](.data/demo.gif)



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

```bash

dive 

```



or you can dive with docker command directly

```

alias dive="docker run -ti --rm  -v /var/run/docker.sock:/var/run/docker.sock wagoodman/dive"

dive 



# for example

dive nginx:latest

```



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

```bash

dive build -t  .

```



Building on Macbook (supporting only the Docker container engine)



```bash

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  .

```



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 

```



![Image](.data/demo-ci.png)



**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:

```bash

dive  --source 

```

or

```bash

dive ://

```



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**



Using debs:

```bash

DIVE_VERSION=$(curl -sL "https://api.github.com/repos/wagoodman/dive/releases/latest" | grep '"tag_name":' | sed -E 's/.*"v([^"]+)".*/\1/')

curl -OL https://github.com/wagoodman/dive/releases/download/v${DIVE_VERSION}/dive_${DIVE_VERSION}_linux_amd64.deb

sudo apt install ./dive_${DIVE_VERSION}_linux_amd64.deb

```



Using snap:

```bash

sudo snap install docker

sudo snap install dive

sudo snap connect dive:docker-executables docker:docker-executables

sudo snap connect dive:docker-daemon docker:docker-daemon

```



**RHEL/Centos**

```bash

DIVE_VERSION=$(curl -sL "https://api.github.com/repos/wagoodman/dive/releases/latest" | grep '"tag_name":' | sed -E 's/.*"v([^"]+)".*/\1/')

curl -OL https://github.com/wagoodman/dive/releases/download/v${DIVE_VERSION}/dive_${DIVE_VERSION}_linux_amd64.rpm

rpm -i dive_${DIVE_VERSION}_linux_amd64.rpm

```



**Arch Linux**



Available in the [extra repository](https://archlinux.org/packages/extra/x86_64/dive/) and can be installed via [pacman](https://wiki.archlinux.org/title/Pacman):



```bash

pacman -S dive

```



**Mac**



If you use [Homebrew](https://brew.sh):



```bash

brew install dive

```



If you use [MacPorts](https://www.macports.org):



```bash

sudo port install dive

```



Or download the latest Darwin build from the [releases page](https://github.com/wagoodman/dive/releases/latest).



**Windows**



Download the [latest release](https://github.com/wagoodman/dive/releases/latest).



**Go tools**

Requires Go version 1.10 or higher.



```bash

go get github.com/wagoodman/dive

```

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



**Nix/NixOS**



On NixOS:

```bash

nix-env -iA nixos.dive

```

On non-NixOS (Linux, Mac)

```bash

nix-env -iA nixpkgs.dive

```



**Docker**

```bash

docker pull wagoodman/dive

```



or



```bash

docker pull quay.io/wagoodman/dive

```



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

```bash

docker run --rm -it \

    -v /var/run/docker.sock:/var/run/docker.sock \

    wagoodman/dive:latest 

```



Docker for Windows (showing PowerShell compatible line breaks; collapse to a single line for Command Prompt compatibility)

```bash

docker run --rm -it `

    -v /var/run/docker.sock:/var/run/docker.sock `

    wagoodman/dive:latest 

```



**Note:** depending on the version of docker you are running locally you may need to specify the docker API version as an environment variable:

```bash

   DOCKER_API_VERSION=1.37 dive ...

```

or if you are running with a docker image:

```bash

docker run --rm -it \

    -v /var/run/docker.sock:/var/run/docker.sock \

    -e DOCKER_API_VERSION=1.37 \

    wagoodman/dive:latest 

```



## CI Integration



When running dive with the environment variable `CI=true` then the dive UI will be bypassed and will instead analyze your docker image, giving it a pass/fail indication via return code. Currently there are three metrics supported via a `.dive-ci` file that you can put at the root of your repo:

```

rules:

  # If the efficiency is measured below X%, mark as failed.

  # Expressed as a ratio between 0-1.

  lowestEfficiency: 0.95



  # If the amount of wasted space is at least X or larger than X, mark as failed.

  # Expressed in B, KB, MB, and GB.

  highestWastedBytes: 20MB



  # If the amount of wasted space makes up for X% or more of the image, mark as failed.

  # Note: the base image layer is NOT included in the total image size.

  # Expressed as a ratio between 0-1; fails if the threshold is met or crossed.

  highestUserWastedPercent: 0.20

```

You can override the CI config path with the `--ci-config` option.



## KeyBindings



Key Binding                                | Description

-------------------------------------------|---------------------------------------------------------

Ctrl + C or Q        | Exit

Tab                             | Switch between the layer and filetree views

Ctrl + F                        | Filter files

PageUp                          | Scroll up a page

PageDown                        | Scroll down a page

Ctrl + A                        | Layer view: see aggregated image modifications

Ctrl + L                        | Layer view: see current layer modifications

Space                           | Filetree view: collapse/uncollapse a directory

Ctrl + Space                    | Filetree view: collapse/uncollapse all directories

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

Ctrl + B                        | Filetree view: show/hide file attributes

PageUp                          | Filetree view: scroll up a page

PageDown                        | Filetree view: scroll down a page



## UI Configuration



No configuration is necessary, however, you can create a config file and override values:

```yaml

# supported options are "docker" and "podman"

container-engine: docker

# continue with analysis even if there are errors parsing the image archive

ignore-errors: false

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

  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-collapse-all-dir: ctrl+space

  toggle-added-files: ctrl+a

  toggle-removed-files: ctrl+r

  toggle-modified-files: ctrl+m

  toggle-unmodified-files: ctrl+u

  toggle-filetree-attributes: ctrl+b

  page-up: pgup

  page-down: pgdn



diff:

  # You can change the default files shown in the filetree (right pane). All diff types are shown by default.

  hide:

    - added

    - removed

    - modified

    - unmodified



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



  # Show the file attributes next to the filetree

  show-attributes: true



layer:

  # Enable showing all changes from this layer and every previous layer

  show-aggregated-changes: false



```



dive will search for configs in the following locations:

- `$XDG_CONFIG_HOME/dive/*.yaml`

- `$XDG_CONFIG_DIRS/dive/*.yaml`

- `~/.config/dive/*.yaml`

- `~/.dive.yaml`



`.yml` can be used instead of `.yaml` if desired.