Gitkube

Gitkube is a tool for building and deploying Docker images on Kubernetes using git push .

After a simple initial setup, users can simply keep git push -ing their repos to build and deploy to Kubernetes automatically.

When should I use gitkube?

Ideal for development where you can push your WIP branch to the cluster to test. Reference implementation for writing git-based automation on your server. Fork this repo and create your own CRD + controller + git remote hook that can do things on the Kubernetes cluster.

Features:

No dependencies except native tooling (git, kubectl)

Plug and play installation

Simple public key based authentication

RBAC ready - Control access to git remotes using RBAC

Support for namespace based multi-tenancy - Remotes can only deploy to their own namespace

No assumptions about repository structure

Getting started

Gitkube will run on any Kubernetes vendor/distribution AS IS. In case you find any difficulties in the setup, please comment on #33

Install gitkube

Using kubectl

kubectl create -f https://raw.githubusercontent.com/hasura/gitkube/master/manifests/gitkube-setup.yaml #expose gitkubed service kubectl --namespace kube-system expose deployment gitkubed --type = LoadBalancer --name = gitkubed

Using gitkube CLI (DEPRECATED)

Install Gitkube CLI: Linux/MacOS curl https://raw.githubusercontent.com/hasura/gitkube/master/gimme.sh | bash

Windows (using scoop) scoop install gitkube Or download the latest release and add it to your PATH . Use Gitkube CLI to install Gitkube on the cluster: gitkube install

Workflow

Local dev: User creates a base git repo for the application with Dockerfile and K8s deployment

Setting Remote: User defines a spec for Remote containing the rules for git push

Deploying application: Once a Remote is setup, application can be deployed to K8s using git push <remote> master

Local dev

User should have a git repo with source code and a Dockerfile. User should also create a base K8s deployment for the application.

Setting Remote

A Remote resource consists of 3 parts:

authorizedKeys: List of ssh-keys for authorizing git push . registry: Details of docker registry where images are pushed post-build. deployments: Spec for building docker image and updating corresponding K8s deployment.

Here is a typical spec for a Remote:

apiVersion : gitkube.sh/v1alpha1 kind : Remote metadata : name : sampleremote namespace : default spec : # Insert ssh-keys for allowing users to git push authorizedKeys : - " ssh-rsa your-ssh-public-key" # Provide registry details: https://github.com/hasura/gitkube/blob/master/docs/registry.md registry : url : " docker.io/user" credentials : secretRef : regsecret # Name of docker-registry secret # Define deployment rules deployments : - name : www # Name of K8s deployment which is updated on git push containers : - name : www # Name of container in the deployment which is built during git push path : example/www # Docker build context path in the git repo dockerfile : example/www/Dockerfile # Location of Dockerfile for the source code

Deploying application

Once a Remote is created, it gets a git remote URL which you can find in its status spec

$ kubectl get remote sampleremote -o yaml ... status: remoteUrl: ssh://[email protected]/~/git/default-sampleremote remoteUrlDesc: ""

Add the generated remoteUrl in git

$ git remote add sampleremote ssh://[email protected]/~/git/default-sampleremote

And finally, git push

$ git push sampleremote master

More examples

Follow this example repo for more workflows with gitkube.

How it works

Gitkube has three components:

Remote: Custom resource defined by a K8s CRD gitkube-controller: Controller that manages Remote objects and propogates changes to gitkubed gitkubed: Git host that builds docker image from the repo and rolls out deployment

High-level architecture

Contributing

Gitkube is an open source project licensed under Apache License 2.0

Contributions are welcome.

Community and Support

Join the Gitkube channel in the Kubernetes Slack group



Maintainers

This project has come out of the work at hasura.io. Current maintainers @Tirumarai, @shahidh_k.

Follow @gitkube to stay updated.

Gitkube logo concept and design by Samudra Gupta.