if you and your friend have vm and want to sync up you may have to transfer 20gb of file. but with docker docker diff to check the difference then docker commit then docker push which will only be the change. Docker Overview 1. The Docker build system will pull all the images specified in the FROM instruction. A new docker inspect command which can be used. The FROM statement encapsulates the most magical part of Docker. To include spaces within a LABEL value, use quotes and backslashes as you would in command-line parsing. The Dockerfile is as follows:. Docker is a tool which allows developers to make deployment of their software easier. InChapter3,welearnedhowto useavarietyofcommandstomanageDockercontainers. Create a Docker Image containing Confluent Hub Connectors¶. The following example demonstrates how to build an image named mymod/httpd with the tag v2 based on the oraclelinux:7 image so that it can run an Apache HTTP server. The LABEL instruction can be used to add extra information to the image. Building images with Dockerfiles. In this case, we have decided to go with the Alpine image. A drop-in replacement for docker build. I've done this as the following: FROM kong:0. Docker creates many layers while building the image. , environment, labels, install steps). Deploying Apps Deploying a Shiny app. docker container rm Now, create a new folder on your disk! Think of this as the "code" or "developer" folder for all your Tensorflow work. Docker is a virtualization application that abstracts applications into isolated environments known as containers. With the following command, we build a Docker container from our Dockerfile and the Python source code:. Lucero covers how to build an image with the Dockerfile, explaining syntax, best practices, basic tools and runtime libraries, packages and shipping. When Docker exploded onto the scene a few years ago, it brought containers and container images to the masses. Now when the image is ready we can create container with mounted source folder, containing our Scala project and run SBT. John Martin. Buildah's build-using-dockerfile, or bud argument makes it behave just like docker build does, so it's easy to incorporate into existing scripts or build pipelines. Docker has no notion of a cache for ONBUILD commands whereas the Heroku buildpack API has a cache interface. 04 docker image with JetPack 4. Since the Docker daemon runs as root, Docker containers (in general!) now can use the current users display. To get rid of a stopped container, we'd run a docker rm command. » Docker Builder Type: docker. In other words, by setting up a "cloud" environment, when Jenkins pipeline runs, it references the cloud setup and start up instances of the images as agents (slaves). label-schema. ↳my/comanage (git|docker-compose) Creating a local Dockerfile based on the TIER appliances to create campus customizations is always possible. A containerizer is a Mesos agent component responsible for launching containers, within which you can run a Marathon app. At IBM, Dustin produced 75+ patents , including QWERsive (the technology behind "Swype" keyboards), and created the Orange Box (10-node portable cloud hardware). LABEL —provides metadata. Conclusion. MAINTAINER Me Myself "myself@example. Use that Dockerfile to build a new image with the docker image build command. Example: package and tweak PHP, with CCACHE cache already populated. In this article, you'll learn how to build a docker image for your Go application. The popularity of Docker has since grown by leaps and bounds. LABEL allows you to add a label to your docker image. the partition is shared with windows, so if it is hibernated I am unable to mount it rw. added an optional --detach=false option to make the docker service create and docker service update work synchronously. For more details visit our Dockerfile and Dockerfile directives tutorial. 6 at that time. Using label you can organize images in a proper way. A Docker image is a pre-built environment for a certain technology or service. Docker is a virtualization application that abstracts applications into isolated environments known as containers. Show us your docker run command or docker-compose for each container. Docker Overview 1. The most common label is “maintainer”, which specifies the email address and the name of the person maintaining this image. Mar 27, 2019. While Docker already has a public-facing registry for repos, enterprises require adiditional privacy and security. 0 added an optional --detach=false option to make the docker service create and docker service update work synchronously. The convention is to use a maintainer label which directs a user of your image to you, and let’s add thismaintainer label to your Dockerfile:. Easily share your publications and get them in front of Issuu’s. The default shell of RUN in Docker is /bin/sh and this is where the permissions not being set correctly actually has a problem. xyz" RUN – Specify commands to make changes to your Image and subsequently the Containers started from this Image. We'll start with a simple docker image, then we'll learn how to attach a volume to the docker image. You can get a commit badge by adding vcs-url and vcs-ref labels to your Dockerfile. Building docker image. com, or follow me on Twitter. OK, I Understand. Chapter1 WorkingwithDockerimagesand repositories InChapter2,welearnedhowtoinstallDocker. docker container rm Now, create a new folder on your disk! Think of this as the "code" or "developer" folder for all your Tensorflow work. docker wait blocks until container stops. We also tested our application by building a Docker image and running a Docker container out of it. FROM scratch LABEL maintainer="Ansil H" LABEL email="ansilh@gmail. I recommend that you read this blog post before reading this. 5: name your containers, link them together, selectively publish ports, and more By Michael Crosby. This article scratches the surface of using Docker by demonstrating how to quickly containerize and connect a Spring Boot app and its dependent services. Running Docker docker run starts a process with its own file system, its own networ king, and its own isolated process tree docker run -itP image--name name the container docker run --name =so mename org-t terminal interface-i intera ctive session-d daemon Mode-P publish all exposed ports-p expose specific port-p. Having just wiped and reinstalled my laptop provides me the opportunity to redo that and I have decided to use it as an opportunity to explore Docker and containers. Docker partnered with RedHat in 2013 and with AWS in 2014 to create the Elastic Container Service (ECS). For example a Dockerfile ADD instruction creates a single layer with files you want to make available in the image. In our previous article, we got to know how to install Docker engine and covered some important Docker commands we use to get the things done from Docker containers. com; All images are successfully built. A Dockerfile looks like the following:. Docker is a lightweight virtualization technology for Linux that promises to revolutionize the deployment and management of distributed applications. From what I've read, and the errors I've had so far, the easiest way to do it is to extend the kong Dockerfile with my own. A Dockerfile is a text file with instructions written in a format understood by the Docker. 517726+01:00. ENTRYPOINT: It will execute any commands when Docker container will be executed. A new docker inspect command which can be used. Therefore, if you use a compose file with Swarm. Docker, one of the latest crazes, is an amazing and powerful tool for packing, shipping, and running applications. dockerLabels A map of labels that will be applied to the Docker image. com, or follow me on Twitter. I realized I can't just move on to working with Pulp in Kubernetes without building the other sub-service Pulp needs. Some important docker commands to revise. Gitbucket image:----- mkdir technicaladda - cd technicaladda - vi Dockerfile From java:latest MAINTAINER ramki info@google. dockerEntrypoint Overrides the default entrypoint for docker-specific service discovery tasks before running the application. Imagine you have a web service. FROM continuumio/miniconda MAINTAINER hjkuijf RUN pip install numpy SimpleITK ADD python /mrbrains18_example. However, once you understand the basics, you would appreciate its simplicity. In this series of articles, we will tell you our story of how we upgraded more than 350 Jenkins “standard” Maven jobs to Pipeline as code on our Continuous Integration servers, using Jenkins 2 and Docker. Docker is the world's leading software container platform. You can get a commit badge by adding vcs-url and vcs-ref labels to your Dockerfile. Here are five tips to help you move your projects to Kubernetes with learnings from the OpenFaaS community over the past 12 months. Designed for your Docker Hub notes to show the code the image was built from. First we are going to learn how to pull and use images hosted on Docker Hub, and then install Apache on an image of Fedora 22 interactively, after that we are going to. " See "Creating a new workflow" for an example workflow that uses this action. "MAINTAINER" instruction is deprecated codeclimate/spec#46 The LABEL instruction is a much more flexible version of this and you should use it instead, as it enables setting any metadata you require, and can be viewed easily, for example with `docker inspect`. See https://docs. com LABEL. In the above Dockerfile, we have added some info about the maintainer of the image through LABEL instruction. For experts, the advanced functionality of the Dockerfile is under-represented by tooling, yet this is the area that needs the most assistance due to its complexity. But, these images become public, and anyone can access and use your images. MAINTAINER: It sets the Author field of the generated images. As you are already aware, Docker images are the base of containers. There are only a handful of docker instructions available that goes into the Dockerfile. Not all keywords are required for a Dockerfile to function. Drop two files in this folder, one called "dockerfile" with the following contents, FROM tensorflow/tensorflow:latest-py3 ADD. Docker command. This article gives a basic introduction to some Docker concepts, focusing on those areas that are likely to interest Oracle DBAs. In this article we are going to learn about Docker, how to use it to deploy Apache httpd and how can you share it on Docker Hub. As you are already aware, Docker images are the base of containers. How to inspect a docker image from dockerhub without pulling it. We will also explain how to run Jenkins with Docker in a way to keep Jenkins data and configurations persistent. The Technical Preview 5 of Windows Server 2016 has been released yesterday, and it comes with a lot of new cool things for Windows containers and Docker !. many more… For a comprehensive list look at label-schema build time labels specification. Useful links Docker image documentation Docker scratch atsea sample app Arun Gupta on smaller Java images Elton Stoneman Windows Dockerfiles Alpine (the base image from the examples) Running Linux containers on Windows Docker garbage collection Image cleanup in Amazon ECS Image cleanup in Kubernetes spotify-gc 53. Docker has no notion of a cache for ONBUILD commands whereas the Heroku buildpack API has a cache interface. In particular, to us it meant changing from docker-compose run frontend lint to docker-compose run frontend-ci lint. Since a few days Oracle updated the Certified Matrix for the Oracle Fusion Middleware Products concerning certified Oracle Databases. I started the container using the command docker run container name The container started successfully and httpd started with a warning message for ServerName and quit. The popularity of Docker has since grown by leaps and bounds. We also looked at how to deploy an application on the cluster and configure OpenStack instances so you can access it. Microservices with Kubernetes and Docker In one of my previous posts I described an example of continuous delivery configuration for building microservices with Docker and Jenkins. How to run a container based on the image under the Docker runtime. The most common label is “maintainer”, which specifies the email address and the name of the person maintaining this image. Enable PostGIS extension for docker. Image labels let you attach text based data to your Docker images. $ docker run ­it rhel7/rhel bash # Run a bash shell inside an image MAINTAINER Sets the author field of the the generated images LABEL Adds metadata to an. Using label you can organize images in a proper way. This interesting stuff starts happening at the RUN command. Mar 27, 2019. A delivery vehicle for applications, containers are self-contained execution environments with their own isolated CPU, memory, block I/O, and network resources, that share the kernel of the host operating system. COPY — copies files and directories to the container. 2-devel-ubuntu16. BUILDING A CONTINUOUS INTEGRATION PIPELINE WITH DOCKER The key fields to note are as follows: • “Restrict where this build can run” is checked, and the label “docker” is supplied. Add your Docker Hub credentials into Jenkins. Dockers are "linux containers" for application level virtualization. Good place to include maintainer info. Line 4: Since we can distribute Dockerfiles to other developers, it’s a good idea to put our contact information in them with the LABEL instruction. λ docker inspect centos7 | grep "maintainer" "maintainer": "okisanjp ", Qiitaにも同様のポストをしました. Conclusion. An action can use an existing publicly available Docker image, or you can create your own Docker image by including a Dockerfile with your code. docker containers: are actual containers running the applications and includes os, user added files, and meta data docker images: helps to launch docker containers docker file: is a file. FROM nginx And they set the maintainer label. Case in point, our example will only make use of FROM, MAINTAINER, and RUN. Now Oracle 19c (19. Containers are ethereal. Now, you can also see the community catalog as well. com, or follow me on Twitter. In this tutorial, you will use a sample web application based on Node. Following is an example of Jenkins Docker file. The linux containers are support system in the Linux kernel to support virtualization. However, understanding and setting up Docker for your specific application can take a bit of time. 本文主要介绍docker的基本概念和原理,分为: 1. Docker Bench bases its tests on the industry-standard CIS benchmarks, helping automate the tedious process of manual vulnerability testing. Combined with a wildcard DNS entry and a wildcard certificate, developers can specify the desired URL via container labels upon deployment of their container (stack). Playing with Docker - some initial results (pysystemtrade) This post is about using Docker - a containerisation tool - to run automated trading strategies. Docker images are typically quite large, often several GBs, while Dockerfiles are small and serve as blueprints for the images. MAINTAINER MAINTAINER Jasper Xu MAINTAINER sorex@163. Prior to publishing, it is recommended to label your images with a way to contact you should things go awry. These links provide a good place to start learning about how you can use labels in your Docker deployments. LABEL maintainer=someone@xyz. I started the container using the command docker run container name The container started successfully and httpd started with a warning message for ServerName and quit. A Dockerfile looks like the following:. LABEL maintainer="Jean. The docker book. Therefore, if you use a compose file with Swarm. So what is a Dockerfile? A Dockerfile is simply a plain text file that contains a set of user-defined commands, which when executed by the docker image build command--which we will look at next--assemble a container image. In this tutorial, we will explain how to install Jenkins with Docker on Ubuntu 18. : WILDFLY_VERSION - version of WildFly to build; can be changed to another release if necessary (get the list of the currently available versions). Instead, one should use the LABEL instruction to define the author of the generated images. Laradock is a PHP development environment that runs on Docker. Once I uninstalled Sophos, I noted I ended up with a different line. OK, I Understand. Upon specifying a base image with FROM, Docker will look in your local environment for an image named ubuntu:16. osita@gmail. The builder starts a Docker container, runs provisioners within this container, then exports the container for reuse or commits the image. First we are going to learn how to pull and use images hosted on Docker Hub, and then install Apache on an image of Fedora 22 interactively, after that we are going to. »Docker Import Post-Processor Type: docker-import The Packer Docker import post-processor takes an artifact from the docker builder and imports it with Docker locally. イメージは複数のラベルを持てます。複数のラベルを指定したら、 Docker は可能であれば1つの LABEL にすることをお勧めします。各 LABEL 命令は新しいレイヤを準備しますが、多くのラベルを使えば、それだけレイヤを使います。次の例は1つのイメージ. Now that we have our application successfully installing and packaging itself into a Docker image, we need to make that image available using Docker Hub. However, what is often overlooked is the use of Docker to improve deployment of the infrastructure platforms themselves; in other words, the ability. You can find the complete Dockerfile instruction reference here. 9G disk ├─sda1 512M vfat part /boot/efi └─sda2 557. com" => 17f3d260c524 container 생성 docker commit 17f3d260c524 ea7651d29bce # 위에서 만든 container를 토대로 image 생성 docker rm -fv 17f3d260c524 # 필요없어진 container 삭제. the author of the Docker image, its version, etc) ENV - sets the main environment variables, i. Lucero covers how to build an image with the Dockerfile, explaining syntax, best practices, basic tools and runtime libraries, packages and shipping. Because of this, the CNCF landscape has exploded, with hundreds of components to choose from. The linux containers are support system in the Linux kernel to support virtualization. The bi-monthly release cadence with new features and improvements are made possible by a group of maintainers, Docker engineers and contributors from all around the world. Docker : Writing Your First Dockerfile. 9G disk ├─sda1 512M vfat part /boot/efi └─sda2 557. A Dockerfile is a text file with instructions written in a format understood by the Docker. Why dockerfile is required? We have lot of pre-existing docker images available in docker hub registry. While this simplicity is a good thing, it gives room for individuals to just hack commands together, without fully understanding the impact. Learn how to set this up using Private Registry. LABEL maintainer="xx@gmail. ENTRYPOINT: It will execute any commands when Docker container will be executed. You can get started with Buildah immediately, dropping it into place where images are currently built using a Dockerfile and docker build. I recommend that you read this blog post before reading this. Docker Hub, one of the largest cloud-based library of Docker container images, has suffered a data breach after an unknown attacker gained access to the company's single Hub database. The location can be changed by modifying the file /etc/default/docker. Maintainer would typically be your email address. Since a few days Oracle updated the Certified Matrix for the Oracle Fusion Middleware Products concerning certified Oracle Databases. Docker also allows multiple FROM instructions in a single Dockerfile to create multiple images. Docker command. This ensures the job will only attempt to execute on slaves that have been appropriately configured and tagged. Learning objectives. If you need Docker to be reachable via the network in a safe manner, you can enable TLS by specifying the tlsverify flag and pointing Docker’s tlscacert flag to a trusted CA certificate. If Docker encounters a label/key that already exists, the new value overrides any previous labels with identical keys. Docker: A QPID Message Broker Container OK I lied. We will here discuss the Singularity Python recipe writers and parsers that will help you to convert between Singularity and Docker recipes. You can contact lawrence at: lawrence@krubner. The docker book. Final notes. And best of all: it supports Docker as backend and creates proxy rules on-the-fly when a docker container or stack is deployed, by inspecting the container's labels. We also tested our application by building a Docker image and running a Docker container out of it. I finally decided to learn docker, being a fun of linux academy tutorials it was a no-brainer to go through their docker training. “容器技术和微服务”系列公开课 • 每周四晚8点档" • Docker——种全新的作式 "• 容器编排具 Docker"Swarm". Combined with a wildcard DNS entry and a wildcard certificate, developers can specify the desired URL via container labels upon deployment of their container (stack). In this tutorial, you will use a sample web application based on Node. However, days of the monolith daemon approach to container management are pretty much coming to an end. Lucero covers how to build an image with the Dockerfile, explaining syntax, best practices, basic tools and runtime libraries, packages and shipping. Thanks! @abbyfuller. # Builds a Docker image for running the Kitura-Starter sample application. To set a label corresponding to the MAINTAINER field you could use:. Dockerfile is basically a text file that contains a set of. dockerLabels A map of labels that will be applied to the Docker image. Let’s take fifteen minutes and find out why by deploying our own application using Docker, AWS, and Flask (a Python microframework used for building web applications). This Dockerfile pull public "jboss/wildfly" Docker image, deploy your application into WildFly and expose 8080 port for web accesses. Docker and Singularity. If you want to run and then interact with a container, docker start then docker attach to get in. 22:9100",job="monitor-exporters_node-exporter"} 1: host{host="swarm-01",instance="10. You can get started with Buildah immediately, dropping it into place where images are currently built using a Dockerfile and docker build. Using the Label tags we specify other information about the image we are setting up, #Step 2 LABEL version="1. Open Source IT Portal. Docker Development WorkFlow — a guide with Flask and Postgres. MAINTAINER DockerFile 제작한 사람의 정보를 기입합니다. LABEL maintainer – Optional field to let you identify yourself as the maintainer of this image. Docker hub provides a "mini CI" to build your images and you don't have push entire image to docker hub. 이번 포스팅에서는 Kubernetes Pod를 생성하고 애플리케이션을 배포하는 과정에 대해 살펴보겠습니다. Hello, dear readers! Welcome to another post from my blog. How can I best indicate that there are multiple authors/maintainers of a docker image built using a Dockerfile? If I include multiple separate MAINTAINER commands, only the last one seems to take effect. ENTRYPOINT: It will execute any commands when Docker container will be executed. I never though before about the Docker containers and the results the chown (change the ownership of a file) command can have on the final image. Additionally, I haven't mapped the host's `/usr/lib/cuda/lib64` folder to the docker container. Docker is similar to a virtual machine in many respects, but much lighter and faster, and having a reproducible environment to run Petalinux may be of useful when switching versions. In the previous article we have seen how we can configure a Apache HTTPD server in a Docker container and saw how to start using that. The agents. Recreate the image. Having just wiped and reinstalled my laptop provides me the opportunity to redo that and I have decided to use it as an opportunity to explore Docker and containers. This is just a label (it used to be a dedicated Docker directive). An additional layer is created with the installed RPMS you provided in the RUN directive. Constructing the Dockerfile. $ docker build -t centos7/nonroot:v1. 20:9100",job="monitor-exporters_node. This can be easily extended by swapping your website into wherever we use "my_website" and updating the apache config part accordingly. To specify multiple labels, separate each key-value pair by a space. 9G disk ├─sda1 512M vfat part /boot/efi └─sda2 557. And best of all: it supports Docker as backend and creates proxy rules on-the-fly when a docker container or stack is deployed, by inspecting the container's labels. Learn Step 1 - Docker Containers, Step 2 - Docker Images, Step 3 - Inspect, Step 4 - Query By Label, Step 5 - Daemon labels, via free hands on training. They also happen to almost always base from. This way, I can take advantage of the catching layers of docker to speed up the process, and at the same time I end up with the building instructions compiled in the Dockerfile. What is Helm? Helm helps you manage Kubernetes applications — Helm Charts help you define, install, and upgrade even the most complex Kubernetes application. Containers are a way to package software in a format that can run isolated on a shared operating system. The docker book. Instead, one should use the LABEL instruction to define the author of the generated images. to Docker and. Home » Articles » Linux » Here. How can I best indicate that there are multiple authors/maintainers of a docker image built using a Dockerfile? If I include multiple separate MAINTAINER commands, only the last one seems to take effect. ShinyProxy uses one or more Docker images to serve the Shiny apps to end users. An additional layer is created with the installed RPMS you provided in the RUN directive. Not all keywords are required for a Dockerfile to function. As of this writing, I’m on Docker Desktop for Windows 2. Labels are additive including LABELs in FROM images. Building a container from a Dockerfile¶. In our previous article, we got to know how to install Docker engine and covered some important Docker commands we use to get the things done from Docker containers. March 20, 2019 Oracle Essbase on Docker: What, How, Why. For example, when the above docker-compose file is used, in an nginx setting file, a php-fpm container can be specified using “php-fpm:9000”. COPY — copies files and directories to the container. The docker Packer builder builds Docker images using Docker. Nvidia-docker镜像 1. CMD: It will execute any commands when Docker container will be executed. FROM ubuntu:18. -runtime-ubuntu14. dockerEntrypoint Overrides the default entrypoint for docker-specific service discovery tasks before running the application. In this we have developed a web application using ASP. ADD — copies files and directories to the container. A list of data volumes to make available in the Docker image. Especially the description label which mostly remains static. LABEL: many issue a LABEL command for the container description and another LABEL command for the version of the image produced. Instead, one should use the LABEL instruction to define the author of the generated images. Rather than requiring a complete operating system, like a traditional virtual machine, Docker is built on top of Linux containers, a feature of the Linux kernel, that allows light-weight Docker containers to share a common kernel while isolating. Docker images prov. VOLUME: Volumes are a mechanism to persist data generated by the container on the Host OS, and share directories from the Host OS with the container. Docker is a tool for running Linux processes in an isolated or "sandbox" environment LABEL maintainer="Scott Came (scottcame10@gmail. I've done this as the following: FROM kong:0. You can query them with docker inspect. You can find the complete Dockerfile instruction reference here. As long as time is invested in making the container a. If you need Docker to be reachable via the network in a safe manner, you can enable TLS by specifying the tlsverify flag and pointing Docker’s tlscacert flag to a trusted CA certificate. While Docker already has a public-facing registry for repos, enterprises require adiditional privacy and security. Prior to publishing, it is recommended to label your images with a way to contact you should things go awry. NOTE - Additional and newer modules are available. py /tmp CMD python /tmp/test. Label_Maintainer: Create Label corresponding to the maintainer field: Entrypoint: Constructor for Entrypoint yet to be implemented: dockerfile: dockerfile-method: toString,Dockerfile-method: Convert a Dockerfile to String: LabelSchemaFactory: Create Build-time labels according to Label Schema Convention: docker_build: Build a Docker image from. py docker build 命令是根据上下文自动构建镜像。. 33 specifically locks Docker Image base to specific Ubuntu Linux image running Node 0. Install Docker and Build Docker Image for Java Services MAINTAINER "your mailid" Labels: Docker, Install Docker and Build Docker Image for Java Services. com; All images are successfully built. ENTRYPOINT: It will execute any commands when Docker container will be executed. LABEL maintainer="docker_image_creator" RUN apt-get update && apt-get install -y nginx Dockerfileは、1行ごとに以下の形式で記載していくことで、1行目から実行される。. We use cookies for various purposes including analytics. com" => 17f3d260c524 container 생성 docker commit 17f3d260c524 ea7651d29bce # 위에서 만든 container를 토대로 image 생성 docker rm -fv 17f3d260c524 # 필요없어진 container 삭제. Drop two files in this folder, one called "dockerfile" with the following contents, FROM tensorflow/tensorflow:latest-py3 ADD. Containers. I add this such that others know who to contact about the image and also so I can search for my docker containers, especially when there are many of them running concurrently on a server. Start Docker service with the following command: $ systemctl start docker $ systemctl enable docker. Then, I checked the image info by running docker inspect. Docker Overview 1. First we are going to learn how to pull and use images hosted on Docker Hub, and then install Apache on an image of Fedora 22 interactively, after that we are going to. They are used to pass information like Maintainer of docker image, Version number, purpose or some other remarks. You use the docker build command to create a Docker image from the definition contained in a Dockerfile. 本文主要介绍docker的基本概念和原理,分为: 1. 9M iso9660 loop /media/cdrom sda 557. To display an image's labels, use the docker inspect command. is a company based out of San Francisco and is the overall maintainer of the open-source project. In Docker Host, we have Docker Daemon, Containers and Images. This article gives a basic introduction to some Docker concepts, focusing on those areas that are likely to interest Oracle DBAs. 이미지에 label 을 여러개 넣을 수 있는데 각각의 < 키 >=< 값 > 사이에 공백을 주면 된다. FROM ibmcom/swift-ubuntu-runtime:latest MAINTAINER IBM Swift Engineering at IBM Cloud LABEL Description="Docker image for running the Kitura-Starter sample application. WORKDIR – setup working directory. Environment and Metadata These docs are for Singularity Version 2.