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Docker Intro – Installation, nginx image and localhost

This is a very quick guide on getting an NGINX image running in a docker container, and accessible through your devices localhost.

Step 1: Install Docker Desktop




Step 2: Start docker desktop

Double click the desktop icon the start the docker desktop app:

Step 3: Pull the nginx image and launch a container

Open the command line (cmd or terminal), run the following command:

docker run -d nginx:latest

The ‘-d’ argument stands for ‘detached’, meaning we can continue to use the cmd/terminal window while the container is running.

This will fetch the latest Nginx image from dockerhub and mount it in a new container. This method will first check if you have already pulled the nginx image:

If you refer back to the Docker desktop app you’ll see both the nginx image (latest) and also a running container:

Step 4: Port Binding

We need to expose the closed container to our local network.

Run the following command to see the running container, including the default assigned port:

docker ps

If you try to visit localhost and specify the above port, the nginx server will not be reachable:

We need to tell docker to assign the container port to a port we specify, to allow us to access it via our browser.

Firstly we need to stop the running docker container, type the following to see the running container:

docker ps

Copy the container id, then run:

docker stop <container_id>

Now we’ll start a new container, passing in the arguments to assign the network port we can use to visit the docker container through our browsers:

docker run -d -p 9000:80 nginx:latest

‘-p’ = Publish a containers port to a host

‘9000:80’ = Take port 80, and bind it to localhost port 9000

Now if we visit http://localhost:9000/, you’ll see the nginx server welcome page:

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