Good option is to set docker to use this without writing sudo

The Ops Perspective

check the docker version

docker version

Download an Image

Image is similar to VM templates (for people working in operations) and to classes (for developers).

check current (pulled) images

docker images

Pull the ubuntu:latest image (if you don’t have it)

docker pull nginx:latest

NGINX is a server-side application that handles web requests.

Start a container from the image

Running new container

docker run --name test -d -p 8080:80 nginx:latest

Long number confirms the container was created

docker run starts new container
--name test name for container ‘test’
-d start container in the background
-p 8080:80 map port 80 in the container to port on Docker host
nginx:latest image to base container

see running container

docker ps

Execute a command inside the container

Attach your shell to a new Bash process inside the container

docker exec -it test bash

docker exec executes a command inside a running container
-i (interactive) keeps STDIN open so you can type
-t (tty) gives you a terminal (so it feels like a real shell)
test the name (or ID) of the container
bash the command being run (starts a Bash shell)

Delete the container

stop

docker stop test

delete

docker rm test

verify

docker ps -a

-a even those in stopped state

---

The Dev Perspective

clone the sample repo

git clone https://github.com/nigelpoulton/psweb.git

Create image – Containerize the app

Go to the cloned repo.

create a Docker image (required Dockerfile)

docker build -t test:latest .

docker build creates a Docker image from a Dockerfile
. use the current folder as the build context
-t test:latest tags (names) the image

check

docker images

Run the app as a container

start container from created image

docker run -d \ --name web1 \ --publish 8080:8080 \ test:lates

docker run starts a new container from an image
-d runs it in detached mode (in background)
--name web1 gives the container the name web1
--publish 8080:8080 maps ports: (8080 is often used for web server development)

• left side (8080) = your computer (host/127.0.0.1)
• right side (8080) = container
  test:latest the image used to create the container

Run app

in browser
127.0.0.1:8080

Clean up

commands to terminate the container and delete the image.

docker rm web1 -f

docker rmi test:latest