Using Docker to deploy applications, encapsulate software tools, and otherwise simplify every software development ask

Learn to use Docker for application development and deployment

(April 3, 2018)

Docker is a wonderful tool that abstracts away all kinds of details about configuring and maintaining Linux Containers. The power to simply type "docker run image-name" and have a bunch of complexity automatically handled is great. However Docker is one of those tools with lots of moving parts behind the scenes, and some training is needed to use it well.

Moving Docker's files to a custom location

(January 30, 2018)

Docker is a wonderful tool that abstracts away all kinds of details about configuring and maintaining Linux Containers. The power to simply type "docker run image-name" and have a bunch of complexity automatically handled is great. But you may want to change Docker's defaults, and just how do you do so? In my case "/var/lib/docker" would be on an SSD drive, and to lengthen its lifetime I want to minimize the number of writes to that drive. Moving this directory to the SSD should help with that goal.

Deploying Docker images to a server without using a Docker Registry

(August 30, 2017)

We formerly deployed server applications to a Linux server using manual processes. An advanced team might use shell scripts to automate deployment. Over time tools like Chef or Ansible and more grew to handle ever-more-complex server application deployment scenarios. A few years ago, Docker came onto the scene with a whole new approach involving building a "Container" housing a complete operating system image that runs your application. Having built the Container, it's easy to ship that container to a server or run it on your laptop. The compelling gain is having the exact same development environment on your laptop as is deployed to your servers. Using the EXACT same environment streamlines your work by removing a ton of potentially destabilizing variables.

The preferred method is to build a Docker container image on your laptop, or on a build server, and upload the image to a Docker Registry. The image can then be downloaded from the Registry onto any number of systems.

What if you don't want to, or cannot, use a Registry? You could instead deploy the source code to the server, and build the container image on the server. That's a very unwise move, and it's better to ship the container image to the server. Turns out that is easy to do.

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