Write a Dockerfile Let’s start with a simple Dockerfile, which lives in Rails’ root:In Docker Desktop, you configure resource usage on the Advanced tab in Preference (macOS) or Settings (Windows). You can find an example Rails application running in Docker here. Developing with Docker, Docker Compose, and Rails With Docker and Docker Compose running on OS X, we can move forward by preparing a Rails app to run in a Dockerized environment.What if my computer’s running a different version of one of these services than yours is? That could easily cause inconsistencies if we’re developing in a team environment. – and when you start having a bunch of services all relying on each other, it makes development more difficult, especially collaborative development. These services can be practically anything: a web server, app server, database, background job processor, etc. See, where Docker truly excels is when you have multiple services that are all communicating together. I don’t want to just show you how to run a Rails app with Docker I want to build with you an actual use-case scenario where using Docker makes a ton of sense. If you Google around, you’re bound to find plenty of tutorials that review how to get started with Docker and ( insert your favorite language) – but I want to take it a step further.
AppTo take things a step further, we’ll also be talking about docker-compose – a wonderful tool by the Docker team that helps manage the running of multiple containers.Im trying to use gruntjs livereload with a wordpress theme development. Let’s take a thorough look at each service. That makes sense: in development, you rarely need all of the services up and running (Webpacker, Sidekiq, etc.). Whenever we create a comment (i.e. The ScenarioWe want to build a simple Rails blog API with user, post, and comment resources you can see the ERD of our planned database over to the right. If the server.Let’s talk a bit about what we actually want to build. ![]() Docker Rails Development Software That AreContainers are also designed to be spun up and down very quickly, which helps make them appealing. Lightweight pieces of software that are geared to running a single specific process. They’re sort of like virtual machines, but much, much smaller and they each have a specific job to do. Docker is a platform for running and managing what are called containers – i.e. Best recovery for macThat last statement’s really important, because networks in Docker are really cool. All we’re doing here is preparing 4 different images (2 of which are built with this project’s Dockerfile) that will all be run at the same time – in the same network. For now, we’ll stick with the default SQLite).I won’t lie – it looks like there’s a lot going on here, but stay with me. There’s a little bit of setup for us to get through before we take that step.Run the following command line commands to get our base database structure going (for a real app, we would use a serious database such as PostgreSQL, MySQL, etc. Getting StartedNote: For the following code, we’ll be using Rails v5.0.2.We’re ready to start building our app – but for this first segment, we’re not even gonna use Docker. Microservices have been around for a while, but with the popularization of Docker (and containers in general), it’s being talked about a lot more as a viable architecture for even small- to mid-size projects.You’ve now got the knowledge, so when you get a chance, play around with Docker and see if it’s right for your Rails app. If you enjoyed this post about Docker and want to check out how companies use containerization in the real world, you should read more into the microservice architecture. After you issue that POST request, jump to to see Maildev in action – and you can see the exact email you just created!While Docker is definitely a hot topic right now, will it stand the test of time? Who knows – but the concepts behind containerization are here to stay – that much we know for sure, and Docker is really helping to push that movement forward. This command still works because we’re mapping port 3000 of our Rails app container to port 3000 on the Docker host (which is our local machine) – so we can communicate with it the same way we did before. This is difficult to get a grasp on the first time you see it (and many times after that, too) – but believe it or not, we’re almost done here, so let’s keep going.Next, we need to add a few settings in our development.rb config file to set up SMTP to send to the Maildev container’s SMTP server:Curl - X POST ' - d "comment=foo" - d "comment=2" - d "comment=1"If everything’s set up properly, you should get a successful JSON response that includes the comment record you just created. Docker networks are great because they will automatically resolve the hostname of a container based on what you name it – so that if you want to communicate with a container that’s titled sidekiq in the docker-compose.yml file, then you only have to specify its address by its name – “sidekiq”! You do still need to include any ports that the service is running on, though.If this all sounds confusing – don’t worry, you’re not alone. If you’d like to pull down the code we discussed here, check out the demo based on this blog post.
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