When to make a comment in a dockerfile?

Docker treats lines that begin with # as a comment, unless the line is a valid parser directive. A # marker anywhere else in a line is treated as an argument.
Similarly, how to build a docker file with a comment?
Docker - File 1 Step 1 . Please note that the name of the file has to be "Dockerfile" with "D" as capital. 2 Step 2 . The first line " 3 This is a sample Image" is a comment. ... The next line has to start with the FROM keyword. 4 Step 3 . In the next chapter, we will discuss how to build the image. More ...
Keeping this in consideration, why are the commands in the dockerfile important? The commands in the Dockerfile are vital to building a Docker image. Every line of command in the Dockerfile creates the layers that make up the Docker image. Provided the Dockerfile remains the same, every time you build an image off it, it’s certain you’d get the same results.
Subsequently, what happens when you add a new line to dockerfile?
Every line of command in the Dockerfile creates the layers that make up the Docker image. Provided the Dockerfile remains the same, every time you build an image off it, it’s certain you’d get the same results. However, when you add a new line of command, Docker simply builds that layer and adds it to the existing layers.
Additionally, how to run a sample image in Docker?
1 The first line "#This is a sample Image" is a comment. ... 2 The next line has to start with the FROM keyword. ... 3 The next command is the person who is going to maintain this image. ... 4 The RUN command is used to run instructions against the image. ... 5 The last command is used to display a message to the user.

20 Similar Question Found

What is volume in dockerfile?

When a volume is defined in a Dockerfile with the VOLUME instruction it is intended to expose files from the container, for example files that the software in the container creates, as could be the data files of a database. But you want to mount something from your disk into a running container,...

What is the purpose of dockerfile?

What is the Purpose of Dockerfile? A Dockerfile is a text document that contains all the commands a user could call on the command line to assemble an image. Using docker build users can create an automated build that executes several command line instructions in succession.

How does a dockerfile work?

A Dockerfile is like a small "program" to create an image. This small program is run with: docker build -t name-of-result . Each line takes the image from the previous line and makes another image. The prior image is unchanged. The state on the previous line is never edited. Each step of the build process produces a new image.

How can i docker-build with dockerfile?

How to Build Docker Images with Dockerfile Create a Dockerfile #. The most common scenario when creating Docker images is to pull an existing image from a registry (usually from Docker Hub) and specify the changes you ... Building the Image #. The next step is to build the image. ... Running a Container #. ... Conclusion #. ...

Which docker base image to use in the dockerfile?

The most commonly used base image when creating Docker images is Alpine because it is small and optimized to be run in RAM. The Docker Hub is cloud-based registry service which among other functionalities is used for keeping the Docker images either in a public or private repository.

Can you use github codespaces with dockerfile?

If you have a Dockerfile or Docker Compose file in your project/repository, follow the same steps to add a definition and you'll be prompted to select a Dockerfile or Docker Compose file and customize from there. If you then commit these files to a Git repository, you can use it with GitHub Codespaces as well.

Is there a dockerfile for baidu netdisk?

Add Baidu Personal Cloud Storage (pan.baidu.com) support (添加百度网盘支持 (不支持下载)). Compile it yourself. Dockerfile for running official Baidu Netdisk's Linux release.

How to build dockerfile from jenkins official image?

This Dockerfile is builded from jenkins official image, install docker and give access to user jenkins build dockers. You can build this image, but is already in dockerhub gustavoapolinario/jenkins-docker. To run the container, you need add a volume in docker run command. … -v /var/run/docker.sock:/var/run/docker.sock …

Where can i get a dockerfile for chevereto?

Website hosting for https://v3-docs.chevereto.com Dockerfile template project for building container images for Chevereto (ahead) releases Sample Iimporting poject dataset to illustrate how to import content to Chevereto V3 The Chevereto installer.

How to change nginx homepage in dockerfile?

So to fix this you can copy welcome.html into the /usr/share/nginx/html directory as index.html, or change the above index line to reference welcome.html and reload. To make this change more permanent you would likely want to create a dockerfile that defines a docker image overriding the config copied in where you have already set this value.

How to create a dockerfile in spring petclinic?

1. Create a Dockerfile that will run the Jar generated by Spring PetClinic building. Create a file named Dockerfile using your favorite text editor. We want to start with a Java image, so specify Anapsix’s Alpine Java image as our base image. 2. Specify who the maintainer of this image should be using a maintainer label.

How to create dockerfile in visual studio for mac?

The preceding Dockerfile is based on the microsoft/aspnetcore image, and includes instructions for modifying the base image by building your project and adding it to the container. The default Dockerfile created by Visual Studio for Mac exposes Port 80 for HTTP traffic. To enable HTTPS traffic, add Expose 443 to the Dockerfile.

How to install odoo image in dockerfile?

Explain me please the installation process. First I install odoo in some folder and create dockerfile in it. After that - install docker with odoo image from dockerhub. It's right?

Where can i download the esp homekit dockerfile?

You can also download these files from my GitHub here for esp-sdk-dockerfile and here for esp-rtos-dockerfile Open the Terminal app. Click the Finder icon in your dock. Click Go. Click Utilities. Double-click Terminal. To build esp-sdk Docker container, run this command: Open the Terminal app. Click the Finder icon in your dock. Click Go.

How to copy docker files to dockerfile?

The Visual Studio tooling for Docker creates a Dockerfile for ASP.NET projects containing a COPY . . command as below: WORKDIR /src COPY *.sln ./ ... COPY . . From what I've read, the <src> parameter is relative to the context, so isn't affected by the WORKDIR /src command. The <dest> however is relative to the WORKDIR so will be pointing at /src.

What can you do with busybox dockerfile?

BusyBox provides a fairly complete environment for any small or embedded system. This will drop you into an sh shell to allow you to do what you want inside a BusyBox system. This Dockerfile will allow you to create a minimal image for your statically compiled binary. You will have to compile the binary in some other place like another container.

Is there an official dockerfile for akeneo 4.0?

DEPRECATED for PIM 4.0 and above - Official Dockerfiles for Akeneo development and testing [Experimental] Detect all the coupling issues of your project with respect to the coupling rules you have defined.

What can you do with a dockerfile?

The Dockerfile is becoming an increasingly popular format for packaging up applications along with their dependencies. In fact, it’s almost a standard to find a Dockerfile in the root of most project repositories. It allows developers to declare application dependencies, insert configuration as well as define run time and environmental variables.

How to create a dockerfile from ubuntu 18.04?

# syntax=docker/dockerfile:1 FROM ubuntu:18.04 COPY. /app RUN make /app CMD python /app/app.py Each instruction creates one layer: FROM creates a layer from the ubuntu:18.04 Docker image. COPY adds files from your Docker client’s current directory.

Is there a way to temp your dockerfile?

It’s not only you that’s fighting with the Dockerfile shortcomings, so every now and then a tool comes out that tries to fix this problem. The folks at resin.io created an NPM package called dockerfile-template. They use it mainly for overcoming the limitations of the FROM instruction.