How to Use/Setup Docker

Basic instructions relevant to the project. See extras for extra commands such as deleting a container.

Install

Use the gui installer for windows or Mac

https://docs.docker.com/docker-for-windows/install/
https://docs.docker.com/docker-for-mac/install/#install-and-run-docker-for-mac.

Docker build

build an image from a dockerfile. You may optionally do docker pull to pull the from image. If this is your first time building the image prepare to go for a coffee break ☕️ , this can take a while the 1st time however docker will be faster with subsequent builds.

-t [name] tags the image with a name in this case img

Docker run

Create a new container and run it from an image

docker run --name imgc -p 8080:8080 -ti img
--name [name] name the container
-p 8080:8080 map port 8080 in the container to port 8080 on the host machine
-ti terminal interactive mode (get a shell into the container basically)
[image name] the name of the image to create the new container from

It's alive!

Extras -------------------------------------------------

Docker images

list all the images

Docker pull

pull an image from the internet. I.E. Download ubuntu ahead of time.

Docker ps and Docker rm

View all containers and remove a container.

Security

The files tomcat-users.xml and context.xml aren't secure configurations. You can however access the tomcat ui from the host using user and pass1 ... 🔐

Basic Issues/Troubleshooting

Issue	Basic Solution
I can use docker run	Did you try docker rm [container name]
The container doesn't have the latest code	Rebuild docker image and re-run docker build -t [image name] ./
The container isn't working	Try terminal interactive mode, use -ti in docker run
The container isn't working	Did you forward the port? -p 8080:8080 in docker run