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EX180 Practice Exam

Setup

  1. Before you start, make sure you have a quay.io account.
  2. Clone this repo: git clone https://github.com/FWSquatch/do180-practice
  3. Change directory: cd do180-practice
  4. Fire up the VMs: vagrant up
  5. You will now have 2 VMs:
  • workstation.do180.lab - 192.168.88.4
  • registry.do180.lab - 192.168.88.5
  1. Login to the workstation machine with ssh [email protected] and complete the following tasks:

Task 1

Install podman on the workstation machine and add registry:5000 as an insecure registry. Also make sure that podman searches this registry before trying any others.

Task 2

Pull the latest httpd image from the registry.do180.lab registry and run it as root it in the background with the following parameters:

  • Publish container port 80 on host port 8080
  • Attach the /web directory as a volume that maps to /usr/local/apache2/htdocs
  • Give the container the name reg-httpd
  • Make the container start as a service called reg-httpd.service.

Task 3

Pull the latest version of the mariadb image from the registry on registry.do180.lab. Run a container in the background with the following parameters:

  • Give the container the name of testql

  • Publish port 3306.

  • Set the following environment variables:

  • MYSQL_USER: duffman

  • MYSQL_PASSWORD: saysoyeah

  • MYSQL_ROOT_PASSWORD: SQLp4ss

  • MYSQL_DATABASE: beer

  • Connect to your database as the root user and check for the existence of the beer database:

    echo “show databases;” | mysql -uduffman -h 192.168.88.4 -psaysoyeah

  • Run the command located in /sql/beer.sql to insert values into the database.

    mysql -uroot -h 192.168.88.4 -pSQLp4ss < /sql/beer.sql

Task 4

Use skopeo to find all of the tags associated with httpd on the registry.do180.lab server. Create and run a container with the following parameters:

  • Use an httpd image from registry.do180.lab that is NOT tagged with latest
  • Publish port 80 on 8008
  • Give the container the name alp-httpd
  • Run the container in detached mode

Task 5

Do the following with your newly created alp-httpd container:

  • Execute an interactive shell (/bin/sh) in the alp-httpd container
  • Change the text in /usr/local/apache2/htdocs/index.html from “It works!” to “It Twerks!”
  • Use curl to test your changes.
  • Commit the container to an image named registry:5000/httpd:twerks.
  • Push your new image to the registry server (you can check this by visiting http://registry.do180.lab
  • Kill your alp-httpd container and run a new one based on the twerks image using port 8008. Name it tw-httpd.

Task 6

Use the incomplete file located at /dockerfiles/nginx/Dockerfile to create a new image. It must meet these requirements:

  • Pull from centos:8
  • Install nginx
  • Publish port 80 to the outside world
  • Copy index.html and duffman.png into /usr/share/nginx/html directory
  • Run the command nginx -g daemon off

Tag this image as quay.io/YOURUSERNAME/duff-nginx:1.0 and push it to your quay.io account.

Run a container in detached mode named duffman that publishes port 80 to 8989. Test it with curl localhost:8989.

Task 7

Use the incomplete files located in /dockerfiles/mosquitto/Dockerfile to create a new image. Use the comments in the Dockerfile to guide you through creating an image that meets the following requirements:

  • Use the centos 7 base image
  • Add your maintainer info
  • Create a user named duffman
  • Install epel-release and mosquitto (epel-release must be installed first)
  • Create a /colors directory using colors.tar
  • Move skeeter.sh over to /skeeter.sh
  • Make skeeter.sh executable
  • Allows connections to port 1883
  • Switch to the duffman user
  • Run the skeeter.sh script

Build your image with a tag of skeeter:1.0. Run a container in detached mode named mosquitto-1 that publishes port 1883 on port 11883.

You can test your container by running

mosquitto_sub -h 127.0.0.1 -p 11883 -t “#”

If your container is working correctly, every 3 seconds you will see:

Fri Mar 19 15:03:10 UTC 2021 (a timestamp)
purple (a random color)
duffman (the user running the script)