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 🙂
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.
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:
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.
Ctrl + C
Switch between the layer and filetree views
Ctrl + F
Scroll up a page
Scroll down a page
Ctrl + A
Layer view: see aggregated image modifications
Ctrl + L
Layer view: see current layer modifications
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
Filetree view: scroll up a page
Filetree view: scroll down a page
No configuration is necessary, however, you can create a config file and override values:
# 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