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DIT Digital CD Pipeline

The pipeline is designed to deploy apps to multiple PaaS platforms using a unified process.

Prerequisite

  • Jenkins 2 LTS
  • Consul
  • Vault
  • Docker
  • Kubernetes

Config Syntax

Pipeline config for projects are stored in another Git repository: https://github.com/uktrade/ci-pipeline-config

---
name: sandbox
namespace: shared
scm: git@github.com:uktrade/cf-sample-app-nodejs.git
environments:
  - environment: dev
    type: gds
    # PaaS specific path where app deployed to
    app: dit-staging/sandbox/cf-nodejs
    vars: []
    secrets: true # True to pull secrets stored in Vault
    run: []
  - environment: s3
    type: s3
    app: ci-pipeline-s3-test
    # Deprecated: public available environment variables for app
    vars:
      - S3_WEBSITE_SRC: public
    secrets: true
    # Pre deploy commands to run, eg. build css, download binary, etc.
    run:
      - "ls -al ${WORKSPACE}"
      - "env | sort"
      - "echo hello\ world"

Config files are validated using a json schema.

Build Environment

The pipeline allows users to run commands to before deploying, for some project specific commands to work it has to provide language specific runtime and libraries, following languages are supported with tools,

  • Python: using pyenv with .python-version in your project.
  • Nodejs: using nvm with .nvmrc in your project.
  • Ruby: using rvm with .ruby-version in your project.
  • JAVA: using jabba with .jabbarc in your project.

Supported PaaS

  • GOV.UK PaaS (CloudFoundry)
  • AWS S3

GOV.UK PaaS

GOV.UK PaaS is CloudFoundry based PaaS.

app attribute in app config represents org/space/app.

Since CloudFoundry API V3 has removed support for manifest.yml, however the pipeline has inherited some functionalities.

Regions

GOV.UK PaaS now offers both Ireland (eu-west-1) and London (eu-west-2) regions, to specify your region,

manifest.yml:

---
name: sandbox
namespace: shared
scm: git@github.com:uktrade/cf-sample-app-nodejs.git
environments:
  - environment: dev
    type: gds
    # PaaS specific path where app deployed to
    app: dit-staging/sandbox/cf-nodejs
    region: eu-west-2
    vars: []
    secrets: true # True to pull secrets stored in Vault
    run: []

Note: The default region is eu-west-1 if region is not specified.

Buildpack

App can specify different buildpack other than PaaS natively installed buildpacks.

Multiple Buildpacks

manifest.yml:

applications:
  - buildpacks:
    - https://github.com/cloudfoundry/apt-buildpack.git
    - https://github.com/cloudfoundry/python-buildpack.git

Stack

manifest.yml:

applications:
  - stack: cflinuxfs3

Health Check

CloudFoundry supports multiple types of health checks,

  • port
  • process
  • http

For apps would like to use blue/green deployments require to use http health check and provide a URL. CF will wait for new deployment to become healthy before switching routing from old version of app to it.

---
applications:
  - health-check-type: http
  - health-check-http-endpoint: /health

Timeout

manifest.yml:

applications:
  - timeout: 60

For more info: https://docs.cloudfoundry.org/devguide/deploy-apps/manifest.html

AWS S3

app attribute in app config represents S3 bucket.

Required envars:

  • AWS_DEFAULT_REGION
  • AWS_ACCESS_KEY_ID
  • AWS_SECRET_ACCESS_KEY

Optional envars:

  • S3_WEBSITE_SRC: local docroot path
  • S3_WEBSITE_REDIRECT: S3 redirect rule