Pages with tag Docker

Deploying Docker images to a server without using a Docker Registry

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.

Make your own Raspberry Pi git repository server with Gogs and Docker The Raspberry Pi is an amazing little computer that, while it's targeted at the DIY Hardware Maker, it is a full-fledged Linux computer that can be used to run services that used to require much bigger and more expensive computers. How long ago were office servers required to be $4000 systems from the likes of Dell Computers? It seems that the Raspberry Pi (and other tiny computers) can perform the same tasks at a low cost with minuscule energy requirements. To this end I'm setting up Gogs (a github-like server for Git repositories) on a Raspberry Pi. As I worked on the project it seemed most straightforward to use Docker to manage the Gogs process, and therefore the project became setting up Docker on Raspberry Pi to run other services.
Using Docker to host ARM toolchain to cross-compile C code I'm starting up a project that will see me doing custom software development for an ARM single-board-computer running Linux. The recommendation isn't to do compiles ON the board, but instead to cross compile from a Linux workstation (Debian). But, I use a Mac laptop, as do most software engineers these days. While I could run VirtualBox to set up a Debian cross-compiling environment, Docker is much lighter weight. While Docker was originally targeted for deploying server applications, it is useful for packaging anything. In this case there's a ready-made set of Docker containers for cross-compilation including for ARM CPU's.
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