Dive is a tool for exploring a docker image, layer contents, and discovering ways to shrink the size of your Docker/OCI image.
- 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
--source option, you can select where to fetch the container image from:
dive <your-image> --source <source>
or if you want to build your image then jump straight into analyzing it:
dive 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>
No configuration is necessary, however, you can create a config file and override values:
# supported options are "docker" and "podman"
dive will search for configs in the following locations: