![]() ![]() These two options, added in the recent Ansible 1.9.0 release, allow you to use the Docker module to deploy containers in a more idempotent fashion. However, if you’re shipping code often, your application images will be changing frequently, and this task will never see those updates! To deploy new versions of your software, you’ll want to take advantage of the “pull” parameter and the “reloaded” state. However, if any container called “database” is already running on the current host, it won’t launch anything. This task will pull the latest Postgres image from DockerHub if it isn’t present and then launch a single container. Name: database image: postgres:9.4 state: started I also prefer to name my containers whenever I can, so that (1) the output of docker ps is as readable as possible and (2) the container is convenient to reference from other containers and tools later. ![]() It’s good practice to also be explicit about the desired state, even though there’s a default value. The minimum information that you can specify is the name of an image. It supports an intimidating number of module parameters, but you need to know only a few to get started. The Ansible Docker moduleĪnsible includes a Docker module that you use to manage the Docker containers that are active on each host. Most prominently, though, you can use Ansible to manage how and where each of your containers run: image versions, environment variables, volumes and links. Sometimes, you’ll also need to manage the Docker daemon’s configuration or tweak Linux kernel parameters. If the server image you choose doesn’t already have Docker installed, you’ll need some way to do that. Ansible can provision your servers, your networks, your load balancers, and more. ![]() I'm pretty sure Ansible's EULA requires you to use a picture of a cow somewhere Deploying Docker containers with Ansibleĭocker containers provide a powerful way to deliver a consistent environment for your software, from your laptop to a cluster of production machines, but there are still ample responsibilities left for Ansible to take. You can use Ansible to orchestrate the deployment and configuration of your Docker containers on the host, or you can use Ansible to construct your Docker container images based on Ansible playbooks as a more powerful alternative to Dockerfiles. There are two ways that you can combine them, both useful for different reasons. While you certainly can use either on its own with great success, using both together can result in a fast, clean deployment process. ![]() Both offer solutions to the configuration management problem through very different means, enabling you to reliably and repeatably manage complicated software deployments. At first glance, Ansible and Docker seem to be redundant. ![]()
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