The goal of this repo is to show how to containerize a development environment so that one gets the benefits of a local environment, like hot reloading, with the benefits of containerization– a development environment defined in code.
- macOS or Windows:
- Docker Desktop
- make
- Linux:
Get started by running make dev:
$ make dev
Once you see the message "Started server on port 3000", open your browser to http://localhost:3000
COMPOSE_DOCKER_CLI_BUILD=1 DEV_IMAGE=clojure-demo:latest docker-compose up --build
...
Starting clojure_demo_1 ... done
Attaching to clojure_demo_1
demo_1 | OpenJDK 64-Bit Server VM warning: Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.
demo_1 | 2020-08-11 15:08:55.742:INFO::main: Logging initialized @16243ms
demo_1 | 2020-08-11 15:08:55.781:INFO:oejs.Server:main: jetty-9.2.10.v20150310
demo_1 | 2020-08-11 15:08:55.900:INFO:oejs.ServerConnector:main: Started ServerConnector@3741a170{HTTP/1.1}{0.0.0.0:3000}
demo_1 | 2020-08-11 15:08:55.900:INFO:oejs.Server:main: Started @16402ms
demo_1 | Started server on port 3000Once you see the "Started server on port 3000", navigate to http://localhost:3000 in a Web browser.
Open my-webapp/src/my_webapp/views.clj in
your favorite code editor and edit the home-page view. When you save the file,
your browser will automatically reload the page.
You can learn more about how this works by looking at the docker-compose.yaml file.
To run the unit tests, simply run make unit-test or make test:
$ make test
docker build --target unit-test --progress=plain .
...
#14 [unit-test 2/2] RUN lein test
#14 0.277 OpenJDK 64-Bit Server VM warning: Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.
#14 10.82
#14 10.82 lein test my-webapp.handler-test
#14 10.92
#14 10.92 Ran 1 tests containing 2 assertions.
#14 10.92 0 failures, 0 errors.
#14 DONE 11.3s
...
#15 DONE 0.3sThe unit test code can be found in my-webapp/test/my_webapp.
To build a "production" image containing a standalone jar of the application,
you can run make build.
To run the production image, you can run make run. You will then find the
application served at http://localhost:8080.
$ make run
...
docker run --rm -p 8080:8080 --name myapp ccrone/clojure-demo:latest
2020-08-12 16:14:57.159:INFO::main: Logging initialized @6261ms
2020-08-12 16:14:59.128:INFO:oejs.Server:main: jetty-9.2.z-SNAPSHOT
2020-08-12 16:14:59.353:INFO:oejs.ServerConnector:main: Started ServerConnector@3ed981e1{HTTP/1.1}{0.0.0.0:8080}
2020-08-12 16:14:59.354:INFO:oejs.Server:main: Started @8456msThere are extensive comments in the following files:
- Makefile for aliasing commands
- Dockerfile for building images
- docker-compose.yaml for the developer flow