Continuous Delivery with Ansible and Docker

Published: August 7, 2020 by Author's Photo Shane Rainville | Reading time: 3 minutes.
Learn how to use Ansible and Docker to implement an effectively Continuous Delivery strategy in your environment, and accelerate your production releases.

Continuous Delivery is the ability to continuously delivery your application into a target environment. Continuous delivery has empowered today’s most successful tech companies and it is a key ingredient to highly effective DevOps cultures. In this guide you will learn how to implement a continuous delivery solution using Ansible and Docker.

Getting Started

In order to follow along with this guide you will need the following installed on your local development machine.

  • Docker
  • Ansible

You should also have the following on a separate machine.

Docker images should be as lean as possible

commit -> dockerfile –> push dockerhub

Workflow

  • Build Docker Image
  • Test Docker Image
  • Release Docker Image

Test

Integration Tests using Docker

Integration tests are important for testing new feature merges against components of your application. Our pipeline will use

stage("IST") {
  sh: go test
}

Build

We provide the build

docker build -t todobackend-dev -f dockerfile/dev/Dockerfile .
docker run -v ./src:/src golang:1.14.7 go test /src/...
FROM golang:1.14.7 AS build

Base Docker Images

When containerizing an application a base image must be chosen. There are plenty of base images created and maintained by the community available. In the past it was common to use treat containers like an operating system, and as such, base images of operating systems were often used. Over the years this approach has fallen out of favour, due to security and storage efficiency. A base image based on a popular distribution of Linux, such as Ubuntu, will have many packages that are not required to run most applications. Distro images create a large security footprint that must be protected.

Light-weight images are strongly recommended as a base. Alpine Linux is an ultra light-weight distribution of Linux and is one of the most popular for base images. So popular that third-party images typically have an Alpine release.

Multistage Docker Builds

When working with applications that must be compiled prior to being released a single stage docker build, the default build strategy, is a poor choice. With a single stage build your image will contain more than just the product of the compile, it will also include the required build tools and source files.

FROM golang:1.13 AS build

COPY ./src ./

RUN go test

Release

Deploy

Once you’ve successfully built a release-ready Docker image you are ready to move onto the deployment phase.

Ansible Role

---
tasks:
- name: Deploy MyAPP
  command: docker -h ${docker_host} run myapp:${release_version}

Running Jenkins as a Container

For the purpose of this guide a Jenkins server will be deployed using Docker. In a typical environment your build server would be hosted on a separate server or compute instance.

docker pull jenkins\jenkins

Start a development version of Jenkins in a container from the image just pulled down.

docker run -d -p 8080:8080 -v /usr/jenkins/workspace jenkins\jenkins
Author Photo
Blogger, Developer, pipeline builder, cloud engineer, and DevSecOps specialist. I have been working in the cloud for over a decade and running containized workloads since 2012, with gigs at small startups to large financial enterprises.

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