Name	Name	Last commit message	Last commit date
parent directory ..
ex1.10	ex1.10
ex1.11	ex1.11
ex1.12	ex1.12
ex1.13	ex1.13
ex1.14	ex1.14
ex1.17	ex1.17
ex1.6	ex1.6
ex1.7	ex1.7
README.md	README.md

Part 1

Exercise 1.1

Start three containers.
Stop two of them.
Show the process-list.

frodo ~ $ docker ps -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                      PORTS               NAMES
e760a03984d4        nginx               "nginx -g 'daemon of…"   8 seconds ago       Exited (137) 1 second ago                       blissful_williamson
47107e25d76a        nginx               "nginx -g 'daemon of…"   9 seconds ago       Exited (137) 1 second ago                       cool_liskov
370c4825b5ac        nginx               "nginx -g 'daemon of…"   10 seconds ago      Up 9 seconds                80/tcp              trusting_williamson

Exercise 1.2

Clean the docker daemon from all images and containers.
Submit the output for docker ps -a and docker images

Terminated all containers:

frodo ~ $ docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
frodo ~ $

Removed all images:

frodo ~ $ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

Exercise 1.3

Run docker run -it devopsdockeruh/pull_exercise
Submit the secret message and commands to get it.

Give me the password: basics
You found the correct password. Secret message is:
"This is the secret message"

The docker file:
- https://hub.docker.com/r/devopsdockeruh/pull_exercise/dockerfile
The source repository:
- https://github.com/docker-hy/docs-exercise
The code :
- https://github.com/docker-hy/docs-exercise/blob/master/index.js
- basics -> victory()

Exercise 1.4

Start image devopsdockeruh/exec_bash_exercise.
Read the secret message from ./logs.txt

frodo ~ $ docker run -d devopsdockeruh/exec_bash_exercise
9b995503a3307192080b7825683bdc687d5308c3320f365bcce67f1e6fb11ce4

frodo ~ $ docker exec -it 9b995503a3307192080b7825683bdc687d5308c3320f365bcce67f1e6fb11ce4 tail ./logs.txt
..
..
Wed, 15 Apr 2020 08:27:27 GMT
Secret message is:
"Docker is easy"

frodo ~ $ docker kill 9b995503a3307192080b7825683bdc687d5308c3320f365bcce67f1e6fb11ce4

Exercise 1.5

Run Ubuntu.
Prompt and fetch a remote URL.

Suspect the answer here is mostly to install curl, but I might have missed somethign:

docker run -it ubuntu:16.04 sh -c 'apt-get update --quiet --quiet; \
   apt-get install --yes curl ;\
   echo "Input website:"; \
   read website; \
   echo "Searching.."; \
   sleep 1; \
   curl http://$website;'

The output of that works as expected, albeit a lot of noise from the apt-get package installation:

...
Setting up curl (7.47.0-1ubuntu2.14) ...
Processing triggers for libc-bin (2.23-0ubuntu11) ...
Processing triggers for ca-certificates (20170717~16.04.2) ...
Updating certificates in /etc/ssl/certs...
148 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d...
done.
Input website:
helsinki.fi
Searching..
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>301 Moved Permanently</title>
</head><body>
<h1>Moved Permanently</h1>
<p>The document has moved <a href="http://www.helsinki.fi/">here</a>.</p>
</body></html>

Exercise 1.6

Create a Dockerfile..

Result visible as ex1.6/Dockerfile, and can be executed like so:

$ cd ex1.6 && docker build -t docker-clock .
Sending build context to Docker daemon  2.048kB
dStep 1/2 : FROM devopsdockeruh/overwrite_cmd_exercise
 ---> 3d2b622b1849
Step 2/2 : CMD ["--clock"]
 ---> Using cache
 ---> 75f7c28d7c87
Successfully built 75f7c28d7c87
Successfully tagged docker-clock:latest
$ docker run docker-clock
1
2
Ctrl-c

Exercise 1.7

Create a Dockerfile.

Result visible as ex1.7/Dockerfile, and can be executed like so:

$ cd ex1.7 && docker build -t curler .
$ docker run -it curler
Input website:
helsinki.fi
Searching..
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>301 Moved Permanently</title>
</head><body>
<h1>Moved Permanently</h1>
<p>The document has moved <a href="http://www.helsinki.fi/">here</a>.</p>
</body></html>

Exercise 1.8

Image devopsdockeruh/first_volume_exercise has instructions to create a log into /usr/app/logs.txt.
Start that container with a bind-mount.

Note there are no instructions, but we can guess :)

$ touch logs.txt
$ docker run -v $(pwd)/logs.txt:/usr/app/logs.txt devopsdockeruh/first_volume_exercise
...
Wrote to file /usr/app/logs.txt
Wrote to file /usr/app/logs.txt
..
Wrote to file /usr/app/logs.txt
Wrote to file /usr/app/logs.txt
^C

Now we can see the secret message, on the host-system:

$ cat logs.txt
Wed, 15 Apr 2020 08:50:35 GMT
Wed, 15 Apr 2020 08:50:38 GMT
Wed, 15 Apr 2020 08:50:41 GMT
Wed, 15 Apr 2020 08:50:44 GMT
Secret message is:
"Volume bind mount is easy"
Wed, 15 Apr 2020 08:50:50 GMT
Wed, 15 Apr 2020 08:50:53 GMT
Wed, 15 Apr 2020 08:50:56 GMT
Wed, 15 Apr 2020 08:50:59 GMT

Exercise 1.9

Map a port to the container HTTP on :80

$ docker run -p 2030:80 -d devopsdockeruh/ports_exercise

Show it worked:

$ curl http://localhost:2030/
Ports configured correctly!!

Exercise 1.10

Create a Dockerfile to expose an application which is a HTTP-server on :5000.

See the ex1.10/Dockerfile, which can be executed like so:

$ cd ex1.10
$ docker build -t front .
$ docker run -p 5000:5000 -d front
$ curl http://127.0.0.1:5000/
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta content="ie=edge" http-equiv="x-ua-compatible">
    <title>Webpack App</title>
    <link href="vendors~main-1.css" rel="stylesheet" />
    <link href="main.css" rel="stylesheet" />
  </head>
  <body>
    <div id="root">
    </div>
    <script src="vendors~main.js" type="text/javascript"></script>
    <script src="main.js" type="text/javascript"></script>
  </body>
</html>

Exercise 1.11

Create a Dockerfile to expose an application which is a HTTP-server on :8000.

See the ex1.11/Dockerfile, which can be executed like so:

$ cd ex1.11
$ docker build -t backend .
$ touch logs.txt
$ docker run -d -v $(pwd)/logs.txt:/webserver/backend-example-docker/logs.txt -p 8000:8000 backend
$ curl http://127.0.0.1:8000/
Port configured correctly, generated message in logs.txt
$ cat logs.txt
4/15/2020, 9:38:09 AM: Connection received in root
$ cat logs.txt

Exercise 1.12

Basically a repeat of the previous two exercise:
- Update the Dockerfile for the backend & frontend containers.
Click the button and show that it works.

The updated Dockerfiles are here:

The changes here were just adding the ENV ... lines.

Now rebuild both images:

$ cd ex1.12
$ docker build -f Dockerfile.back  -t backend .
$ docker build -f Dockerfile.front -t front .

Start both images:

$ docker run -p 5000:5000 -d front
$ touch logs.txt
$ docker run -d -v $(pwd)/logs.txt:/webserver/backend-example-docker/logs.txt -p 8000:8000 backend

Finally open http://127.0.0.1:5000/, and click the button which, when clicked, shows:

Exercise 1.12: Working!

(Note: Explicitly setup both the browser and the environment variables to use 127.0.0.1, since localhost resulted in CORS issues.)

Exercise 1.13

Create a Dockerfile for a Java-based application.

The created Dockerfile is ex1.13/Dockerfile.

Build it:

cd ex1.13 && docker build -t spring .

Launch it, and test it:

$ docker run -d -p8080:8080 spring
$ curl http://127.0.0.1:8080/
..
            <button class="btn btn-info btn-outline-dark" type="submit">Press here</button>
..

Exercise 1.14

Create a Dockerfile for a Rails-based application.

The created Dockerfile is ex1.14/Dockerfile.

Build it:

cd ex1.14 && docker build -t rails .

Launch it, and test it:

$ docker run -d -p3000:3000 rails
$ curl http://127.0.0.1:3000/
..
    <h1>New Press</h1>
..

Exercise 1.15

Publish your own application, on Docker Hub.

Published Dockerfile for simple application:

Application
- https://github.com/skx/httpd
Docker Hub Entry
- https://hub.docker.com/r/stevekemp/skx_httpd

Exercise 1.16

Publish the existing docker-image devopsdockeruh/heroku-example to heroku.
Share the result.

I did that.

Pulled locally:
- docker pull devopsdockeruh/heroku-example
Created heroku login & installed the heroku CLI tool.
Did the necessary initial steps:
- /opt/heroku/bin/heroku login
- /opt/heroku/bin/heroku container:login
Tagged the image which was downloaded:
- docker tag 5221e4b03bc7 registry.heroku.com/skx-dwd/web
Pushed the image:
- docker push registry.heroku.com/skx-dwd/web
Started the app (?)
- /opt/heroku/bin/heroku container:release -a skx-dwd web

The result was a working Rails application located at:

https://skx-dwd.herokuapp.com/

Exercise 1.17

Create an image that contains your favorite programming environment in it’s entirety.

The created Dockerfile is ex1.17/Dockerfile, which installs the golang compiler, etc.

The entry online is here:

https://hub.docker.com/r/stevekemp/skx_golang

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part1

part1

README.md

Part 1

Exercise 1.1

Exercise 1.2

Exercise 1.3

Exercise 1.4

Exercise 1.5

Exercise 1.6

Exercise 1.7

Exercise 1.8

Exercise 1.9

Exercise 1.10

Exercise 1.11

Exercise 1.12

Exercise 1.13

Exercise 1.14

Exercise 1.15

Exercise 1.16

Exercise 1.17

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Part 1

Exercise 1.1

Exercise 1.2

Exercise 1.3

Exercise 1.4

Exercise 1.5

Exercise 1.6

Exercise 1.7

Exercise 1.8

Exercise 1.9

Exercise 1.10

Exercise 1.11

Exercise 1.12

Exercise 1.13

Exercise 1.14

Exercise 1.15

Exercise 1.16

Exercise 1.17