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AWS Cloud Formation deployment CLI

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  • License: Apache Software License (Apache License 2.0)
  • Author: Henning Jacobs
  • Tags aws , cloud , formation , cf , elb , ec2 , stups , immutable , stacks , route53 , boto
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Senza is a command line tool that enables you to generate and execute AWS CloudFormation templates in a sane, simple way. With Senza, you can write YAML documents and reuse common application stack solutions such as load balancing, auto-scaling, IAM role management, and other configurations. Senza also provides base CloudFormation templates for web applications, background applications, PostgreSQL, Redis clusters, and Amazon ElastiCache stack types.

What Senza Solves

AWS CloudFormation is great for managing immutable stacks on AWS. However, writing CloudFormation templates in JSON format is not human-friendly, which hinders developer productivity. Also, many parts of a CloudFormation template are reusable among applications of the same kind and CloudFormation does not provide a way to reuse templates. Senza addresses those problems by supporting CloudFormation templates as YAML input and adding its own ‘components’ on top. Components are predefined, easily configurable CloudFormation snippets that generate all the boilerplate JSON that CloudFormation requires.

Installation

$ sudo pip3 install --upgrade stups-senza

Usage

$ senza init my-definition.yaml # bootstrap a new app
$ senza create ./my-definition.yaml 1 1.0

Please read the STUPS.io documentation on Senza to learn more.

Senza Definition

# basic information for generating and executing this definition
SenzaInfo:
  StackName: kio
  OperatorTopicId: kio-operators
  Parameters:
      - ImageVersion:
          Description: "Docker image version of Kio."

# a list of senza components to apply to the definition
SenzaComponents:
  - Configuration:
      Type: Senza::StupsAutoConfiguration # auto-detect network setup
  # will create a launch configuration and auto scaling group with min/max=1
  - AppServer:
      Type: Senza::TaupageAutoScalingGroup
      InstanceType: t2.micro
      SecurityGroups: [app-kio] # can be either name or id ("sg-..")
      ElasticLoadBalancer: AppLoadBalancer
      TaupageConfig:
        runtime: Docker
        source: stups/kio:{{Arguments.ImageVersion}}
        ports:
          8080: 8080
        environment:
          PGSSLMODE: verify-full
          DB_SUBNAME: "//kio.example.eu-west-1.rds.amazonaws.com:5432/kio?ssl=true"
          DB_USER: kio
          DB_PASSWORD: aws:kms:abcdef1234567890abcdef=
  # creates an ELB entry and Route53 domains to this ELB
  - AppLoadBalancer:
      Type: Senza::WeightedDnsElasticLoadBalancer
      HTTPPort: 8080
      HealthCheckPath: /ui/
      SecurityGroups: [app-kio-lb]
      Scheme: internet-facing

# just plain Cloud Formation definitions are fully supported:
Outputs:
  URL:
    Description: "The ELB URL of the new Kio deployment."
    Value:
      "Fn::Join":
        - ""
        -
          - "http://"
          - "Fn::GetAtt":
              - AppLoadBalancer
              - DNSName

During evaluation, you can mustache templating with access to the rendered definition, including the SenzaInfo, SenzaComponents and Arguments key (containing all given arguments).

See the STUPS.io documentation on Senza for details.

Unit Tests

$ python3 setup.py test --cov-html=true

Releasing

$ ./release.sh <NEW-VERSION>

Supported by

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