Lab 1

Create Directory and Files

In this lab you will create a Dockerfile which will be used to create a static container.

Create

Project folder called lab1

mkdir ~/lab1

Create the following files inside the lab1 directory
- index.html
- web.conf
- Dockerfile

What did I just do?

index.html

This is the default webserver page that gets served up first

web.conf

This has our server block configurations for our Nginx webserver

Dockerfile

Holds instructions for Docker to build our customer docker image and adds it to our local docker repository

index.html

<html>
<head>
<title> TEST SITE</title>
</head>
<body>
First Page
<p>Demo site for training.</p>
</body>
</html>

web.conf

server {
  listen 80;
  server_name docweb.lab.lan;

  root /usr/share/nginx/html;
  index index.html;

  location / {

  }

  location /doc_status {
    stub_status on;
    allow 172.17.0.1;
    deny all;
  }
}

Dockerfile

FROM nginx

RUN rm -f /etc/nginx/conf.d/default.conf

COPY web.conf /etc/nginx/conf.d/web.conf
COPY index.html /usr/share/nginx/html/index.html

How the Dockerfile works:

FROM the publicly available Nginx container, usually Docker Hub (use this as our base image)

FROM nginx

RUN the Linux command to remove the default.conf file we will install our own web.conf file

RUN rm -f /etc/nginx/conf.d/default.conf

COPY in the new files to the container during creation
COPY web.conf /etc/nginx/conf.d/web.conf
COPY index.html /usr/share/nginx/html/index.html

Build and Run the Container

From the lab1 directory

Build image

docker build -t docimg .

Run Container

docker run -p 81:80 --name docweb -h docweb.lab.local -dit docimg

Let’s validate the new container is running. docker ps -a will show all docker processes both running and excited. Take note of the column hearders. On note Container ID, Image, Status, Ports and Names.

docker ps -a

For additional container inspection run the command ifconfig, this command is much like the windows ipconfig and will show all the interfaces on your machine, we want to see the docker0 interface and ip address. Typically this lives in the 172.17.0.0 neighborhood. Mac and Windows do NOT expose the docker bridge.

Docker inspect

docker inspect docweb

This command will show up all the details of our newly constructed container. You should find it’s ip address within the docker0 cidr.

Container Shell

docker exec -it docweb nginx -t
docker exec -it docweb nginx -s reload
docker exec -it docweb /bin/bash

Using your browser, navigate to

Now let’s view the logs from your container

Docker Logs

docker logs docweb

Remove Container

We will force remove the container, this will stop and delete it in one command.

docker rm -f docweb

Now we want to find and delete our now old customer docker image. Let’s get its container id:

Image ID

docker images | grep docimg

Copy the contianer id from the above step and paste it in place of the words container_id below.

Delete Image

docker rmi container_id

After running the rmi (remove image) command we should no longer see our docimg when running docker images