The Docker commands to do this are quite simple.
DOCKER RUN IMAGE HOW TO
However, we want to know how to save this container as an image so we can make other containers based on this one. So at this point, we’ve updated the contents of a running container and as long as we keep that container around, we don’t need to do anything. Now reload your browser or revisit You will see the message “Hello World!” in place of the default nginx welcome page. ➜ ~ docker cp index.html nginx_base:/usr/share/nginx/html/index.html We will use the docker cp command to copy this file onto the running container. Then save the file and return to the command line. Using an editor on your machine, create an index.html file in the same directory that you have been running Docker commands from. Let’s create a new index.html file and copy it onto the running container. You could do practically anything you wanted here. In order to keep things as simple as possible, we are just going to copy a new index.html file onto the server. So if you wanted to modify this running container so that it behaves in a specific way, there are a variety of ways to do that. You will see the default “Welcome to nginx!” page. Let’s start the container and see what happens. ➜ ~ docker ps -aĬONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMESĬ365af6303e4 nginx:alpine "/docker-entrypoint.…" 6 minutes ago Created nginx_base Note here that the container is not running, so you won’t see it in the container list unless you use the -a flag (-a is for all). Nginx alpine 51696c87e77e 4 weeks ago 23.4MB Web-server-app latest 09a0abf08e08 3 weeks ago 58.3MB Nginx-reverse-proxy latest 1037dc5f8db4 3 weeks ago 142MBĪmitsharma/web-server-app v1 09a0abf08e08 3 weeks ago 58.3MB If you look at the list of images on your system, you will now see the nginx:alpine image: ➜ ~ docker images -aĪmitsharma/nginx-reverse-proxy v1 1037dc5f8db4 3 weeks ago 142MB Status: Downloaded newer image for nginx:alpineĨ5b13f4d8a9bcdab4fbae540cf7bf3704eab13b57c5f44a2d3529d86f1c72ba5 Step 2: Inspect Images When this happens, you will see something like this: Unable to find image 'nginx:alpine' locallyĭigest: sha256:5a0df7fb7c8c03e4158ae9974bfbd6a15da2bdfdeded4fb694367ec812325d31
DOCKER RUN IMAGE DOWNLOAD
If you don’t have the nginx:alpine image in your local docker image repository, it will download automatically. We are using nginx:alpine as a base image for the container. Here we have requested a new container named nginx_base with port 80 exposed to localhost. The Docker create command will create a new container for us from the command line: ~ docker create -name nginx_base -p 80:80 nginx:alpine
So that we don’t get bogged down in the details of any particular container, we can use nginx. Let’s get started by creating a running container.
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