Add a couple of questions on containers

Also, fixed some minor styling issues in random_question.py script.

exercises/devops/ci_for_open_source_project.md

@@ -9,4 +9,18 @@
 
 ### Bonus
 
-Containerize the app of the project you forked using any containerization technology you would like.
+Containerize the app of the project you forked using any container engine you would like (e.g. Docker, Podman).<br>
+Once you successfully ran the application in a container, submit the Dockerfile to the original project (but be prepared that the maintainer might not need/want that).
+
+### Suggestions for Projects
+
+The following is a list of projects without CI (at least at the moment):
+
+Note: I wrote a script to find these (except the first project on the list, of course) based on some parameters in case you wonder why these projects specifically are listed.
+
+* [This one](https://github.com/bregman-arie/devops-exercises) - We don't have CI! help! :)
+* [image retrieval platform](https://github.com/skx6/image_retrieval_platform)
+* [FollowSpot](https://github.com/jenbrissman/FollowSpot)
+* [Pyrin](https://github.com/mononobi/pyrin)
+* [food-detection-yolov5](https://github.com/lannguyen0910/food-detection-yolov5)
+* [Lifely](https://github.com/sagnik1511/Lifely)

exercises/devops/containerize_app.md

@@ -6,18 +6,9 @@
 https://github.com/bregman-arie/node-hello-world
 https://github.com/bregman-arie/flask-hello-world
 ```
-
-`git clone https://github.com/bregman-arie/node-hello-world`
-
 2. Write a Dockerfile you'll use for building an image of the application (you can use any base image you would like)
-
-```
-FROM alpine
-LABEL maintainer="your name/email"
-RUN apk add --update nodejs nodejs-npm
-COPY . /src
-WORKDIR /src
-RUN npm install
-EXPOSE 8080
-ENTRYPOINT ["node", "./app.js"]
-```
+3. Build an image using the Dockerfile you've just wrote
+4. Verify the image exists
+5. [Optional] Push the image you've just built to a registry
+6. Run the application
+7. Verify the app is running

exercises/devops/solutions/containerize_app.md

@@ -0,0 +1,54 @@
+## Containerize an Application
+
+1. Clone an open source project you would like to containerize. A couple of suggestions:
+
+```
+https://github.com/bregman-arie/node-hello-world
+https://github.com/bregman-arie/flask-hello-world
+```
+
+`git clone https://github.com/bregman-arie/node-hello-world`
+
+2. Write a Dockerfile you'll use for building an image of the application (you can use any base image you would like)
+
+```
+FROM alpine
+LABEL maintainer="your name/email"
+RUN apk add --update nodejs npm
+COPY . /src
+WORKDIR /src
+RUN npm install
+EXPOSE 3000
+ENTRYPOINT ["node", "./app.js"]
+```
+
+3. Build an image using the Dockerfile you've just wrote
+
+`docker image build -t web_app:latest .`
+
+4. Verify the image exists
+
+`docker image ls`
+
+5. [Optional] Push the image you've just built to a registry
+
+```
+docker login
+docker image tag web_app:latest <your username>/web_app:latest
+# Verify with "docker image ls"
+docker image push <your username>/web_app:latest
+```
+
+6. Run the application
+
+```
+docker container run -d -p 80:3000 web_app:latest
+```
+
+7. Verify the app is running
+
+```
+docker container ls
+docker logs <container ID/name>
+# In the browser, go to 127.0.0.1:80
+```