Cloud Native Application Bundle

Cloud Native Application Bundle

CNAB is a standard packaging format for multi-component distributed applications

Features

1. Single logical unit (app)
2. Lifecycle management (install, upgrade, uninstall)
3. Digital signatures for bundles
4. Digital signatures for lifecycle state
5. Support for air gapped environments
6. Distribution

Specification

• Core spec addresses features 1, 2, 6
• Registry spec address features 5, 6
• Security spec addresses features 3, 4
• All specifications

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CNAB reference implementation

Easily create bundles with Duffle

Containerized install script

Must accept parameters install|uninstall|upgrade|downgrade|status

Directory layout:

.
├── bundle.json
├── cnab
│   ├── app
│   │   └── run
│   └── Dockerfile
└── duffle.json

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Demo: duffle

Basic example:

Clone examples:

git clone https://github.com/deislabs/duffle

Build bundle:

duffle build ./examples/helloworld/

List existing bundles:

duffle bundle list

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Demo: duffle

Install bundle:

duffle install helloworld-demo helloworld:0.1.1

List installed bundles:

duffle list

Uninstall bundle:

duffle uninstall helloworld-demo

Many example bundles are available

Start a new bundle:

duffle create foo

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CNAB Installer

Interface with Helm, Terraform etc. using Porter

What it is

Containerized installer

Executes commands defined in porter.yaml

Mixins provide templates for common tasks

Publish to OCI registry

Use CNAB compliant tool to install from registry

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Demo: porter

Play with a new package

Create and build package:

porter create

Check porter.yaml:

vim porter.yaml

Build package:

porter build

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CNAB and Registries

Uses OCI registries as storage

cnab-to-oci manages bundles in registries

Convert a CNAB bundle for upload:

# Clone examples
git clone https://github.com/docker/cnab-to-oci

# Push and pull
cnab-to-oci push cnab-to-oci/examples/helloworld-cnab/bundle.json --target myhubusername/repo
cnab-to-oci pull myhubusername/repo@sha256:6cabd752cb01d2efb9485225baf7fc26f4322c1f45f537f76c5eeb67ba8d83e0

Better experience with duffle, porter and docker-app