Docker Node Install
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In the Dockerfile introduction post I introduced a simple Node.js Dockerfile example:
Finally, install Docker: sudo apt install docker-ce Docker should now be installed, the daemon started, and the process enabled to start on boot. Check that it’s running: sudo systemctl status docker The output should be similar to the following, showing that the service is active and running. So, Docker can be a perfect candidate for web app development and testing on Raspberry Pi. Of course, you can do other things like running a web server, proxy server or a database server etc. On Docker on Raspberry Pi single board computer. In this article, I am going to show you how to install Docker on Raspbian OS that runs on Raspberry Pi. For Rancher v2.5+, the Rancher backup operator can be used to migrate Rancher from the single Docker container install to an installation on a high-availability Kubernetes cluster. For details, refer to the documentation on migrating Rancher to a new cluster. This sample Docker Compose file brings up a three-node Elasticsearch cluster. Node es01 listens on localhost:9200 and es02 and es03 talk to es01 over a Docker network. Please note that this configuration exposes port 9200 on all network interfaces, and given how Docker manipulates iptables on Linux, this means that your Elasticsearch cluster is publically accessible, potentially ignoring any. But Docker also gives you the capability to create your own Docker images, and it can be done with the help of Docker Files. A Docker File is a simple text file with instructions on how to build your images. The following steps explain how you should go about creating a Docker File. Step 1 − Create a file called Docker File and edit it using.
NOTE: use double quotes in the CMD line. Single quotes will result in an error.
Let’s use this Dockerfile to build an image, and then run the container.
I’m going to create this file in the dev/docker/examplenode folder. I create a simple Node.js app in the app.js file, using Express:
Super simple, but we have one dependency. I need to add it to the package.json file, so I run
Now you can run node app.js and make sure it works:
Stop this process and let’s create a Docker Image from this.
All you need are the app.js, package.json and package-lock.json files.
And the Dockerfile. Create a Dockerfile file in the same folder, with no extension (not Dockerfile.txt).
You can freely delete the node_modules folder that now contains the Express library and its dependencies, but you can also create a .dockerignore file and add node_modules inside it, to make Docker ignore this folder completely.
It works like .gitignore in Git.
Run the command
It will take a while to download the Node image and run npm install, then you’ll get a successful message.
It’s important to note that after you first download a base image like the node one we use here, that will be cached locally, so you don’t need to download it again and the image building process will be much faster.
Now we can run a container from the image:
Now you can see the image running in Docker Desktop:
And you can click the “Open in browser” button to open the app running on port 3000:
Just like before! Except now the app is running in its own container, completely isolated, and we can run whatever version of Node we want in the container, with all the benefits Docker gives us.
For example you can remove the container and run it on port 80 instead of 3000, with:
The image does not need to change, all you change is the port mapping. Here’s the result:
Docker Installing Node
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More docker tutorials:
- Docker Tutorial
- Docker Useful Resources
- Selected Reading
In the earlier chapters, we have seen the various Image files such as Centos which get downloaded from Docker hub from which you can spin up containers. An example is again shown below.
If we use the Docker images command, we can see the existing images in our system. From the above screenshot, we can see that there are two images: centos and nsenter.
But Docker also gives you the capability to create your own Docker images, and it can be done with the help of Docker Files. A Docker File is a simple text file with instructions on how to build your images.
The following steps explain how you should go about creating a Docker File.
Install Node In Docker
Step 1 − Create a file called Docker File and edit it using vim. Please note that the name of the file has to be 'Dockerfile' with 'D' as capital.
Step 2 − Build your Docker File using the following instructions.
The following points need to be noted about the above file −
Docker Node Install Package
The first line '#This is a sample Image' is a comment. You can add comments to the Docker File with the help of the # command
The next line has to start with the FROM keyword. It tells docker, from which base image you want to base your image from. In our example, we are creating an image from the ubuntu image.
The next command is the person who is going to maintain this image. Here you specify the MAINTAINER keyword and just mention the email ID.
The RUN command is used to run instructions against the image. In our case, we first update our Ubuntu system and then install the nginx server on our ubuntu image.
The last command is used to display a message to the user.
Docker Node Install Vim
Step 3 − Save the file. In the next chapter, we will discuss how to build the image.