exolever devops recruiting exercises

It is not mandatory to finish all these exercises, but we would appreciate it if you explain how you solved them. Do a PR with your answers.

1. Check this configuration file and answer the questions

 http {
    default_type  application/octet-stream;
    include       /etc/nginx/mime.types;
  server {
      location ~* ^/.+/backup/$ {
          deny all;
      }
      location ~ ^/calendar/(.*)  {
          set $calendar_app_server exo-calendar:8891;
          proxy_pass         http://$calendar_app_server/$1$is_args$args;
          proxy_http_version 1.1;
          proxy_set_header   Upgrade $http_upgrade;
          proxy_set_header   Connection $connection_upgrade;
          proxy_set_header   Host $host;
          proxy_set_header   X-Real-IP $remote_addr;
          proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for
          proxy_set_header   X-Forwarded-Host $server_name;
          add_header         X-Bender "Bite my shiny metal ass";
      }
      location / {
          proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
          proxy_set_header Host $http_host;
          proxy_redirect off;
          proxy_buffer_size 128k;
          proxy_buffers	4 256k;
          proxy_busy_buffers_size	256k;
          # *application* server like Unicorn/Rainbows! serve static files.
          if (!-f $request_filename) {
              proxy_pass http://exolever_app_server;
              break;
          }
      }
      gzip             on;
      gzip_min_length  1000;
      gzip_proxied     expired no-cache no-store private auth;
      gzip_types       text/plain text/html text/xml text/css text/javascript application/xml application/xhtml+xml;
  }

• What is this file?
• There are errors on it? Which ones?
• If you found errors, how did you found it?
• What is doing the section:

      location ~* ^/.+/backup/$ {
          deny all;
      }
  

• What is doing this line? set $calendar_app_server exo-calendar:8891

2. Create a REST service (choose your favourite language, but you cannot use Flask) with three entrypoints, we will test it with this sentences

• curl -X POST -H "Content-Type: application/json" -d '{"name":"your name"}' localhost:8001/hello/ must return your name
• curl -X GET localhost:8001/hour/japan/ must return the current time in Tokyo
• curl -X GET localhost:8001/weather/japan/ must return the current temperature in Tokyo, you should use a public forecast API.

3. Write a Dockerfile to pack the previous REST service in a Docker container, try to create it as smallest as you can.

4. Check the next Dockerfile and answer the questions:

FROM node:11-alpine AS base

LABEL maintainer="Bender the Offender "

WORKDIR /app

# Configure timezone to Europe/Madrid (required by tests)
RUN apt-get install nodejs

# Define registry to improve porformance
RUN npm config set registry https://registry.npmjs.org/

COPY package.json npm-shrinkwrap.json .

RUN npm install

COPY . .

CMD [ "npm", "start" ]

• What is wrong in this Dockerfile
• There are missing parts, can you complete it?
• Why are we using COPY twice?
• Upload it to Docker Hub

4. Check this repo, there is a python_app folder. Modify the code to allow printing the weather of every city in the list. Try to do TDD also.

5. Which ports are open in www.exolever.com? How did you check it?

6. Which is the latest version of the Docker compose file reference?

7. Create a bash script that asks the user for a "name" and call your webservice. Use colors if you can!

8. OPTIONAL Build the container of the question 3 with travis-ci

9. OPTIONAL Create a docker-compose.yml to run the previous container

10. OPTIONAL What is true regarding the following code?

async function getList () {
  return functionThatReturnsAPromise()
}

async function main () {
  const list = await getList()
  // ...
}

main()

• a) It will fail to execute as the async keyword is incorrectly used
• b) This code is correct and does not need to be improved
• c) The code will execute but the await function call will never return as the promises are not properly chained
• d) The code will execute correctly but the first async keyword should be removed as the function getList() already returns a promise