Slim Docker image for Deno

slim-deno

Minimal Deno runtime image from scratch.

Build

docker build -t slim-deno .

Opening Deno repl

docker run -it --init slim-deno deno

Sample Dockerfile

FROM jveres/slim-deno:1.4.4
EXPOSE 80
COPY server.ts .
CMD ["deno", "run", "-A", "server.ts"]

Download Details:

Author: jveres

Demo: https://hub.docker.com/r/jveres/slim-deno

Source Code: https://github.com/jveres/slim-deno

#deno #node #nodejs #javascript

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Slim Docker image for Deno

Docker manifest - A peek into image's manifest.json files

docker manifest – An experimental feature !

The image manifest provides a configuration and a set of layers for a container image.

This is an experimental feature. To enable this feature in the Docker CLI, one can edit the config.json file found in ~/.docker/config.json like :

{
        "auths": {
                "https://index.docker.io/v1/": {
                        "auth": "XXXXXXX"
                }
        },
        "HttpHeaders": {
                "User-Agent": "Docker-Client/19.03.8 (linux)"
        },
        "experimental": "enabled",
        "debug": true
}

What is ‘docker manifest’ ?

The docker manifest command does not work independently to perform any action. In order to work with the docker manifest or manifest list, we use sub-commands along with it. This manifest sub-command can enable us to interact with the image manifests. Furthermore, it also gives information about the OS and the architecture, that a particular image was built for.

A single manifest comprises of information about an image, it’s size, the layers and digest.

A manifest list is a list of image layers (manifests) that are, created by specifying one or more image names. It can then be used in the same way as an image name in docker pull and docker run commands.

Commands to get started with :

After enabling this feature, one would be able to access the following command :

docker-manifest-enter image description here

These commands are easy to use. It basically avoids the need for pulling and running and then testing the images locally, from a docker registry.

Next, to inspect an image manifest, follow this syntax,

 docker manifest inspect image-name

enter image description here

.

#devops #docker #devops #docker #docker learning #docker-image

Iliana  Welch

Iliana Welch

1595249460

Docker Explained: Docker Architecture | Docker Registries

Following the second video about Docker basics, in this video, I explain Docker architecture and explain the different building blocks of the docker engine; docker client, API, Docker Daemon. I also explain what a docker registry is and I finish the video with a demo explaining and illustrating how to use Docker hub

In this video lesson you will learn:

  • What is Docker Host
  • What is Docker Engine
  • Learn about Docker Architecture
  • Learn about Docker client and Docker Daemon
  • Docker Hub and Registries
  • Simple demo to understand using images from registries

#docker #docker hub #docker host #docker engine #docker architecture #api

Docker creating an image | Build and run your image | Docker Fundamentals

Docker create an image from a container | Creating your own image | How to create Docker Image from a Container and Dockerfile.

#docker #image #dockers

Removing Docker Images

1. Introduction

In a previous article, we explained the difference between Docker images and Docker containers. In short: An image is like a Java class, and containers are like Java objects.

In this tutorial, we’ll look at the various ways of removing Docker images.

2. Why Remove Docker Images?

The Docker Engine stores images and runs containers. For that purpose, the Docker Engine reserves a certain amount of disk space as a “storage pool” for images, containers, and everything else (such as global Docker volumes or networks).

Once that storage pool is full, the Docker Engine stops working: We can’t create or download new images anymore, and our containers fail to run.

Docker images take up the majority of the Docker Engine storage pool. So we remove Docker images to keep Docker running.

We also remove images to keep our Docker Engine organized and clean. For instance, we can easily create dozens of images during development that we soon don’t need anymore. Or, we download some software images for testing that we can dispose of later.

We can easily remove a Docker image that we pulled from a Docker repository: If we ever need it again, we’ll just pull it from the repository once more.

But we have to be careful with Docker Images we created ourselves: **Once removed, our own images are gone unless we saved them! **We can save Docker images by pushing them to a repository or exporting them to a TAR file.

3. Downloading PostgreSQL 13 Beta Images

PostgreSQL is an open-source relational database. We’ll use the first two PostgreSQL 13 beta Docker images as examples. These two images are relatively small, so we can download them quickly. And because they are beta software, we don’t have them in our Docker Engine already.

We’ll use the beta 2 image to create a container. We won’t use the beta 1 image directly.

But before we download these two images, let’s check first how much space Docker images take up in the storage pool:

#devops #docker #docker images #docker containers

Haylie  Conn

Haylie Conn

1625886946

Docker Image for Novice

We will learn how to create docker image of Node.js app/service. There are lots of article already on this topic but they have lack of simplicity. When I went through them to create my first docker image. I realized they are complicated. But making a docker image of Node.js app is not as tough as it seems.

Docker is an open platform for developing, shipping, and running applications. Docker enables you to separate your applications from your infrastructure so you can deliver software quickly.

I am assuming that you already have knowledge of working in Node.js. Here I will not go through creating a Node.js project. You can refer this repo for code.

When you start learning Docker, two main terms come up

  1. Image
  2. Container

In this article, we will learn about Images.

What is Docker Image?

A docker image is collection of files that bundle together all essentials (installations, application code and dependencies) required to configure a fully operational container environment. In simple words, it bundle all files necessary to run a container.

For creating docker image, docker needs a manual. This manual is called Dockerfile. Developer just needs to create this. Sounds cool!

Lets create a Dockerfile for our case.

#nodejs #docker #docker-beginner #docker-image #dockerfiles