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# vidar

`vidar` is a set of docker & k8s deployment tools based on thor gem

## Installation

Add this line to your application's Gemfile:

```ruby
gem 'vidar'
```

And then execute:

    $ bundle

Or install it yourself as:

    $ gem install vidar


#### Requirements :

* multistage `Dockerfile`, with at least 2 stages defined: `base`, `release`.
* `docker-compose.ci.yml` file with defined services for all mentioned stages, e.g.

```yml
version: '3.7'

services:
  base:
    image: gcr.io/[GCP-PROJECT-ID]/[APP-NAME]:base-${CURRENT_BRANCH:?err}
    build:
      dockerfile: Dockerfile
      context: .
      target: base
      cache_from:
        - gcr.io/[GCP-PROJECT-ID]/[APP-NAME]:base-master
        - gcr.io/[GCP-PROJECT-ID]/[APP-NAME]:base
        - gcr.io/[GCP-PROJECT-ID]/[APP-NAME]:release
        - gcr.io/[GCP-PROJECT-ID]/[APP-NAME]:$REVISION
    env_file:
      - .env
    environment:
      - RACK_ENV=test

  release:
    image: gcr.io/[GCP-PROJECT-ID]/[APP-NAME]:release
    build:
      dockerfile: Dockerfile
      context: .
      target: release
      args:
        - REVISION=${REVISION:?err}
      cache_from:
        - gcr.io/[GCP-PROJECT-ID]/[APP-NAME]:base-${CURRENT_BRANCH:?err}
        - gcr.io/[GCP-PROJECT-ID]/[APP-NAME]:base-master
        - gcr.io/[GCP-PROJECT-ID]/[APP-NAME]:base
        - gcr.io/[GCP-PROJECT-ID]/[APP-NAME]:$REVISION
```

* `vidar.yml` file to the project root directory, which following content:

```yml
# docker image name, required
image: gcr.io/[GCP-PROJECT-ID]/[APP-NAME]
# k8s namespace, required
namespace: borrower
# github name used to build deployment notification content
github: RenoFi/vidar
# deployments config per kubectl context, required for `monitor_deploy_status` command
deployments:
  gke_project_us-east4_staging:
    # Deployment Name
    name: staging cluster
    # Color of successful notification, default value: 008800
    success_color: "00ff00"
    # Color of failed notification, default value: ff1100
    failure_color: "ff0000"
    # Deployment url, e.g. url to gke cluster workloads filtered by namespace
    # Similar to all other values it may contain references to others using mustache-like interpolation.
    url: "https://console.cloud.google.com/kubernetes/workload?project=project&namespace={{namespace}}"
    # Sentry webhook url used to send deploy notifications
    # (make sure you use the exact url with trailing slash provided by sentry), optional
    sentry_webhook_url: https://sentry.io/api/hooks/release/builtin/123/asdf/
    # Slack webhook url used to send deploy notifications, optional
    slack_webhook_url: https://hooks.slack.com/services/ASCKNZ0vug2R3Ydo/ASCKNZ0vug2R3Ydo/ASCKNZ0vug2R3Ydo
# docker-compose file, optional, default value: docker-compose.ci.yml
compose_file: docker-compose.ci.yml
# default_branch, optional, default value: master
default_branch: dev
# console_command, optional, default value: bin/console
console_command: rake console
```

## Usage

Available commands are:

`vidar pull` - pulls existing docker images from repository to levarage docker caching and make build faster

`vidar build` - builds docker images

`vidar cache` - caches intermediate stages

`vidar publish` - publishes docker images

`vidar release` - a set of `pull`, `build`, `cache` and `publish`

`vidar deploy` - deploys/applies release image with `REVISION` tag in given k8s namespace and cluster (unser the hood it's `kubectl set image` command). Before calling the command you must have `kubectl` context set. If you use GCP/GKE simply call `gcloud container clusters get-credentials you-cluser-name --zone=us-east4`. If you have `deploy-hook-template` job defined, it creates `deploy-hook` job with given `REVISION`.

`vidar monitor_deploy_status` - monitors if all containers are up and running, if slack_webhook_url if defined, sends a noficiation (on both failure and success).

`vidar kube_exec --name=web --command='bin/console'` - execute given command (`/bin/ssh` by default) inside the first pod with given name (all pods by default).

`vidar console --name=web` - execute console command (`bin/console` by default) inside the first pod with given name (all pods by default).

## Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/RenoFi/vidar. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct.

## License

The gem is available as open source under the terms of the [MIT License](https://opensource.org/licenses/MIT).