Docker Install You need to first follow the instructions for setting up docker :. We need Docker in order to install Docker Compose. (PUBLIC) Docker Hub Automated Build fails and the logs are missing/empty (KB000225). 目前 Docker 官方维护了一个公共仓库 Docker Hub,其中已经包括了数量超过 15,000 的镜像。大部分需求都可以通过在 Docker Hub 中直接下载镜像来实现。 注册. Once you know the name or ID of the image, you can start a container with the docker run command. com/r/nitincypher/docker-ubuntu-python-pip/ Alternatively, you can always do "docker pull nitincypher/docker-ubuntu-python-pip". RStudio Images. Cloud images also contain the optimised kernel for each cloud and supporting boot utilities. This script is ONLY FOR A FRESH OS, It will install Apache, MySQL 5. Therefore if you wanted to push your image to Docker Hub, you would first create an account to get a Docker ID that also maps to a “repo” in Docker Hub, e. 04 is available. We can also. 先来看看 Docker Hub 的界面: 在这个章节,我们来学习 Docker Hub 的相关话题: 账户. 2 and could OVERWRITE any existing web setup on the machine. Now you can see all downloaded images by using the command: docker images. We will now configure and run SQL Server 2017 Linux image on a Docker container for Ubuntu. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading. Let's start Nginx Docker container using below command. 04 server, They are: Install Docker on Ubuntu Using Default Repositories; Install Docker from Official Repository { Recommended } Install Docker on Ubuntu using Default Repo: The first step is updating your system to the current. com Flag --email has been deprecated, will be removed in 1. And now we've logged in successfully to Docker Hub from this Docker Client. What is the difference between Docker, LXD, and LXC. docker pull ubuntu. Docker and Canonical have formed an alliance under which the Docker CS Container Engine will be commercially supported by both vendors. 04, but none of the instructions I came across managed to take me all the way, so here are a few short notes on how I managed to accomplish this:. This is the standard Ubuntu 18. 6 (24,670 ratings) Course Ratings are calculated from individual students’ ratings and a variety of other signals, like age of rating and reliability, to ensure that they reflect course quality fairly and accurately. Remember that “Docker Hub” is assumed so I could do this: docker tag ubuntu-xenial. Have Docker installed following the instructions from How To Install and Use Docker on Ubuntu 18. Sharing images on Docker Hub. Combining Jenkins and Docker together can bring improved speed and consistency to your automation tasks, which is why we've collected some hopefully helpful resources on this page to get you started! Docker is an open-source project that automates the deployment of applications inside software. 4 container from Docker Hub. The Docker daemon streamed that output to the Docker client, which sent it to your terminal. After everything has been downloaded, you can create a container with this OS: docker run -i -t ubuntu /bin/bash Or with Debian, for example: docker run -i -t debian /bin/bash If it can't find the OS (not pulled yet) it will automatically pull it from Docker Hub. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading. To know more about docker containers and how it works, you can refer this blog on Docker Container. Fully compatible with all Ubuntu packages. Kitematic's one click install gets Docker running on your Mac and lets you control your app containers from a graphical user interface (GUI). The Docker daemon pulled the "hello-world" image from the Docker Hub. Installing Docker. Run/Create Container from Image. Working With Docker Hub — Docker Hub is a cloud-based repository in which Docker users and partners create, test, store and distribute container images. Step 1: Head on over to the Docker Hub website. Every image is built using a Dockerfile. The Docker daemon streamed that output to the Docker client, which sent it to your terminal. Install Docker for Windows. Let's say you want to deploy Ubuntu on your local machine; you would do: $ docker pull ubuntu. Either you start the new container as the root user and change ownership from 104 to 472 or you start the upgraded container as user 104. We hope that you found our discussion on Docker Hub useful and would consider creating a Docker Hub account for yourself and get started with using containers. Search Docker Hub for automated images Search Docker Hub for the term 'fedora' and only display automated images ranked 1 or higher: $ docker search --automated -s 1 fedora NAME DESCRIPTION STARS OFFICIAL AUTOMATED goldmann/wildfly A WildFly application server running on a. compose --version docker-compose version 1. Step 1: Authenticate Docker to your Default Registry After you have installed and configured the AWS CLI, authenticate the Docker CLI to your default registry. The same container that a developer builds and tests on a laptop can run at scale, in production, on VMs, bare metal, OpenStack clusters, public clouds and more. good instructions, including docker-compose with a postgis server; QGIS community is on Docker Hub but not with a QGIS image timcera/qgis-desktop-ubuntu timcera, 3rd party. The docker search command, search images that match the specified TERM. This will pull the latest tagged LTS image of ROS from Docker Hub onto your local host machine. With the help of Moby and BuildKit maintainer, Akihiro Suda, "we added rootless support to BuildKit image builder in 2018 and from February 2019 the same rootless support was merged to Moby upstream and is available for all Docker users to try in experimental mode", Tiigi mentions. All I could find is an official Docker image for Ubuntu Desktop on Docker Hub. Now download the Docker container with name Ubuntu on your local system using following commands. The Docker daemon pulled the "hello-world" image from the Docker Hub. Here, in the following example, we are installing Ubuntu in Docker. I am going to show you how to setup and use your own private Docker image repository. We will then use it to serve a simple web page from our home directory – all without the need to install a web server on our host. Together we are working to further extend the value of Kubernetes for all of our customers. Minimal Ubuntu, on public clouds and Docker Hub. All I could find is an official Docker image for Ubuntu Desktop on Docker Hub. com:~# docker search ubuntu NAME DESCRIPTION STARS OFFICIAL AUTOMATED ubuntu Ubuntu is a Debian-based Linux operating s. Here are instructions to setup your own Docker on Azure with an Ubuntu server. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading. Conclusion. The Docker CLI uses Docker’s public registry by default. We already have our docker hub login. A Docker container is mini computer actively running in your computer. In progress, subject to change. With Docker swarm you can easily configure and deploy your Docker-based GitLab installation in a swarm cluster. (Recommended read: Step by step guide to create Docker Image) (Also read: Create & manage docker hosts with Docker Machine on VirtualBox). My curiosity started when I started exploring various images on Docker Hub for a project. A: We are doing important upgrades to our Hub service which require us to put Hub into a limited service mode. The Docker daemon pulled the "hello-world" image from the Docker Hub. Canonical will ensure global availability of secure Ubuntu images on Docker Hub. First, add the public key for the official Docker repository:. Cleaning up. Feature image by _jinnie_ from Pixabay. There are two possible solutions to this problem. Image repository (hub. In this tutorial we will see how to install Docker Compose on an Ubuntu 16. The Docker daemon streamed that output to the Docker client, which sent it to your terminal. Installing Docker Application in Ubuntu 18. As you probably know, Docker is a fast, lightweight, OS level virtualization technology for developers and system administrators who wants to build an application with all of its dependencies, and ship it all out as only one package. To illustrate, in this article we will explain how to install Docker on CentOS 7 and Ubuntu 16. Artifactory Docker images can be pulled from Bintray and run as a Docker container. Sharing images on Docker Hub. For the version of windows Being used in this vignette (win 10 home) the older Docker toolbox is what we are going to use to run containers. Fully compatible with all Ubuntu packages. As part of the project, R-Hub maintains a series of docker images designed to replicate the environments CRAN uses for testing. Log on your Azure portal and go to Marketplace. While the process of installing Docker CE on Ubuntu is similar to the installation process for CentOS, there are some differences. Docker is a software platform that allows you to build, test, and deploy applications quickly. The Docker daemon created a new container from that image which runs the > executable that produces the output you are currently reading. 04; An account on Docker Hub if you wish to create your own images and push them to Docker Hub, as shown in Steps 7 and 8; Step 1 — Installing Docker. Build a new Ubuntu Server. Search Docker Images. You can also create and upload your images on the Docker Hub public registry. Installing Ubuntu. on the Ubuntu 16. In this case we're about to get an Ubuntu image from the official Ubuntu page on Docker Hub. We already have our docker hub login. com/r/nitincypher/docker-ubuntu-python-pip/ Alternatively, you can always do "docker pull nitincypher/docker-ubuntu-python-pip". Docker is a new technology that emerged in the last two years and took the software world by storm. Official Images on Docker Hub Estimated reading time: 4 minutes The Docker Official Images are a curated set of Docker repositories hosted on Docker Hub. Set up Docker on Ubuntu 18. Install Docker. Why add metadata labels? Have you ever found an image on Docker Hub and wondered what code it was built from? By labelling containers with the source code details, MicroBadger makes it easy to move with confidence between source code repository and image hub. Docker containers only run as long as. if my Docker ID was karlcode I would create an image tag that referenced my repo in Docker Hub. Docker is an open-source project to easily create lightweight, portable, self-sufficient containers from any application. For example, you can run the ls command on your 'my_ubuntu' docker container directly from the command prompt: $ docker exec -it my_ubuntu ls. In the official Ubuntu release, https://registr. Provided you installed GitLab using docker-compose, all you have to do is run docker-compose pull and docker-compose up -d to download a new release and upgrade your GitLab instance. Prerequisites Docker EE customers. The Docker daemon streamed that output to the Docker client, which sent it to your terminal. Pull the SQL Server 2017 Linux container image from the Docker Hub. The docker run command takes the Docker image as a template and produces a container from it. Build a new Ubuntu Server. Install Docker. The official TensorFlow Docker images are located in the tensorflow/tensorflow Docker Hub repository. With the help of Moby and BuildKit maintainer, Akihiro Suda, "we added rootless support to BuildKit image builder in 2018 and from February 2019 the same rootless support was merged to Moby upstream and is available for all Docker users to try in experimental mode", Tiigi mentions. Docker Hub lists the items by how many users “star” (similar to adding as a favorite) the image (regardless of official image status). And here you can see the repositories that I've created in Docker Hub. (Reference: docker manifest inspect) Push the image to Docker Hub and you can get the compressed size of the image on Docker Hub website. After everything has been downloaded, you can create a container with this OS: docker run -i -t ubuntu /bin/bash Or with Debian, for example: docker run -i -t debian /bin/bash If it can't find the OS (not pulled yet) it will automatically pull it from Docker Hub. The Docker daemon pulled the "hello-world" image from the Docker Hub. Sign in to Azure Pipelines. 04 LTS Xenial May 18, 2016 Updated November 3, 2016 LINUX HOWTO Docker is a free and open source project for the automation of deployment of apps under software containers that provides an open platform to pack, ship and run any application any where. Engineered to provide both a small footprint and package. Docker is a containerization technology that allows you to quickly build, test and deploy applications as portable, self-sufficient containers that can virtually run everywhere. "Just downloading the Ubuntu official image from Docker Hub is 188MB, and it has been downloaded over 40 million times, which equates to over 7,520 TB of data transfer between Docker Hub and users. Trying to push a Docker image to Docker Hub with the following command: sudo. Docker swarm is the lightest way of utilizing multiple hosts. net - […] is getting more and more popular. Docker containers are built from Docker Images and these images are pulled from Docker Hub which is a registry managed by Docker Company. This will pull the latest tagged LTS image of ROS from Docker Hub onto your local host machine. com) docker login. The images use centos:7 as the base image. Sharing images on Docker Hub. All I could find is an official Docker image for Ubuntu Desktop on Docker Hub. Note, always review the README on Docker Hub for the most up to date set of recommended arguments and environment variables. A detailed look into an image. 2 on Ubuntu 14. GitHub Gist: instantly share code, notes, and snippets. Just like git repo hosting services, a Docker repository can be public or private. 10 or newer. cn/ ,之后点击 Apply 保存后 Docker 就会重启并应用配置的镜像地址了。. The Docker daemon pulled the "hello-world" image from the Docker Hub. 04, but none of the instructions I came across managed to take me all the way, so here are a few short notes on how I managed to accomplish this:. Docker Hub search for images Use Ubuntu docker pull ubuntu:19. 「Minimal Ubuntu 18. Run/Create Container from Image. It will act as a base for some future articles that I have planned to write. sh # $ sh get-docker. To know more about docker containers and how it works, you can refer this blog on Docker Container. The Docker CLI uses Docker's public registry by default. We publish our Docker images in a few different repositories on Docker Hub. We create a scalable Docker image vulnerability analysis (DIVA) framework that automatically discovers, downloads, and analyzes both official and community images on Docker Hub. com 免费注册一个 Docker 账号。 登录. 04 또는 우분투 18. Docker is an essential component of Automation, CI/CD & DevOps. 04 How To Install and Use Docker on Ubuntu 16. good instructions, including docker-compose with a postgis server; QGIS community is on Docker Hub but not with a QGIS image timcera/qgis-desktop-ubuntu timcera, 3rd party. Basically, these Official repositories are designed to: It offers essential base OS repositories (like, ubuntu, centos) which serve as the starting point for the majority of users. It allows you to upload and download images from a central location. NET Core API in an image to the Docker hub, and then creating a Linux virtual machine in Azure to host the API. Have you ever wondered how many images are hosted on the Docker Hub? Or what the most popular base images are? We've got answers to those questions and lots more in this overview of data we've pulled from the Docker Registry API. However, Linux containers require the Docker host to be running a Linux kernel. io sudo docker — version docker-compose — version sudo docker run hello-world. Search for ubuntu and select a version you. com For more examples and ideas, visit: https://docs. This course is going to make your docker fundamental crystal clear. Docker can help you build a Home Media Server in just minutes without complex setups. Now, rename the docker image something like registryserver:portnumber/image name:tag. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading. Getting a Docker image on a Linux system via Docker Hub is done through the "pull" command. The alternative way is to use the docker search command to list or search for a Docker image. $ docker --version Docker version 18. Create Composer File, docker-composer. 04; An account on Docker Hub if you wish to create your own images and push them to Docker Hub, as shown in Steps 7 and 8; Step 1 — Installing Docker. Yes, you can try https://hub. Let's say you want to deploy Ubuntu on your local machine; you would do: $ docker pull ubuntu. 10 do not have the necessary features Docker requires to run containers; data loss and kernel panics occur frequently under certain conditions. The most popular repository is Docker Hub, which is a centralized registry where you can store and distribute your own images. It is your choice if you want to share your docker image in internet. Baseimage-docker is a special Docker image that is configured for correct use within Docker containers. DOCUMENT LINK: Create or Build Your Own Private Docker Registry on Linux htt. More specifically, I want to download a Docker Image from Docker Hub on a machine in a restricted environment which does not (and cannot) have the Docker client software installed. Docker has been a game changer in Applications containerization and the whole microservices design and deployment patterns. This is the standard Ubuntu 18. > (arm64v8) > 3. Download automated build from public Docker Hub Registry: docker pull dockerfile/ubuntu. Elasticsearch is also available as Docker images. Home of the script that lives at get. If the image name does not match with given format then docker push or pull command will try to upload or download the image from the public registry, not from the private registry. The Docker Enterprise Difference Leading companies rely on our container platform to build, manage and secure all their applications from traditional applications to cutting-edge microservices — and deploy them anywhere. This video shows you that How to Build Own Private Docker Hub Registry on Linux. Elasticsearch, Logstash, Kibana (ELK) Docker image documentation. The Docker daemon streamed that output to the Docker client, which sent it to your terminal. For example, the Ubuntu operating system image. We provide Docker images for all the products in our stack, and we consider them a first-class distribution format. Along with Python, we are going to run Nginx and Redis containers. At Connect. io within a DNAnexus applet, one simply calls dx-docker pull. 适用于Ubuntu,Debian,Centos等大部分Linux,会3小时同步一次Docker官方资源 安装体验版或测试版,体验最新Docker。. 4、启动主hub容器 $ sudo docker run -d -P --name selenium-hub selenium/hub-d 表示容器以守护态(Daemonized)形式运行。. If not, register there. cn/ ,之后点击 Apply 保存后 Docker 就会重启并应用配置的镜像地址了。. Docker Hub is the place where open Docker images are stored. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading. -p is used to map the port number of the internal Docker image to our main Ubuntu server so that we can access the container accordingly. And here you can see the repositories that I've created in Docker Hub. We already have our docker hub login. Operations on Docker Images. Do they offer the same services or different. sh # # NOTE: Make sure to verify the contents of the script # you downloaded matches the contents of install. Home of the script that lives at get. (PUBLIC) Docker Hub Automated Build fails and the logs are missing/empty (KB000225). img and after that I followed the Wiki above to install Docker and it did not work. The Docker organization has a website called Docker Hub which allows people to distribute their own Docker images. Now we should move how to install docker in Linux flavor like Centos, Rhel, Ubuntu. First you need to connect to the GNS3 VM and open a shell. The docker search command help us search images from the docker public repository. The NGINX image available on Ubuntu Server. As you probably remember from grade school math class, primes are numbers that are only divisible by 1 and themselves. In our earlier tutorial, we learned to install Docker on RHEL\ CentOS 7 & also created a docker container. Let's start Nginx Docker container using below command. While the process of installing Docker CE on Ubuntu is similar to the installation process for CentOS, there are some differences. For example, to download the Ubuntu 16. Using Docker registry, you can build and share images with your team. How To Install and Use Docker on Ubuntu 16. 2 counts as stone-age. 04 LTS上的安装和基本使用. Note: To run the docker command without sudo, create the docker group and add your user. Docker 要求 Ubuntu 系统的内核版本高于 3. io on Docker on Ubuntu or Debian systems. Docker scans images for security vulnerabilities, giving you more information about your environment. Previous versions of Jellyfin included Ubuntu under the Debian repository. docker push accepts a tag name and pushes it to the default repository, which is Docker Hub. Similarly, we can pull more images that we require and are. There is a plan to drop support for 32-bit packages in Ubuntu, starting from Ubuntu 19. We posted a DockerCon 2018 update last year, and it is time to share how we've improved the experience of using. Figure 6: Download Ubuntu Core 14. To do this, you can follow Step 1 and Step 2 from our previous tutorial – [How to Install & Use Docker on Ubuntu 18. A pull is essentially a download of a Docker image (Ubuntu, Redis, nginx, etc) from Docker Hub. Here are instructions to setup your own Docker on Azure with an Ubuntu server. Once you have your Docker. 04 image (if not available. Docker:Ubuntu 18. We will now configure and run SQL Server 2017 Linux image on a Docker container for Ubuntu. It allows Docker users to pull images locally, as well as push new images to the registry. It’s easy to use and a great resource featuring excellent Docker images. 2 on Ubuntu 14. To try something more ambitious, you can run an Ubuntu container with: $ docker run -it ubuntu bash Share images, automate workflows, and more with a free Docker Hub account: https://hub. edu ABSTRACT Docker containers have recently become a popular approach to provision multiple applications over shared physical hosts. We already have our docker hub login. Log on your Azure portal and go to Marketplace. The docker provisioner is ideal for organizations that are using Docker as a means to distribute things like their application or services. compose and not as docker-compose. The Docker daemon pulled the "hello-world" image from the Docker Hub. 04 LTS image on the Docker Hub. Docker Registry is a software application that allows you to create and store your images within your organization. Anyway, let's. The Docker daemon pulled the "hello-world" image from the Docker Hub. Below are the steps for installing Tomcat 8 within a Docker container on Ubuntu 14 , in my case on Amazon Ec2. Installing Docker. 04 that run on AGX. A Docker container is mini computer actively running in your computer. In this tutorial we explore the creation of containers containing all the environment needed to explore data-science applications in Python: Anaconda, as well as Jupyter notebooks. Create the docker group and add my user account to it. Base Docker Image. Example:3 Search Docker Images in its Registry Server With help of ‘docker search‘ command we search the docker. 04 How To Install and Use Docker on Ubuntu 16. Step 1 — Install Docker Compose. Install SQL Server and create a database on Ubuntu. Docker scans images for security vulnerabilities, giving you more information about your environment. In this case we're about to get an Ubuntu image from the official Ubuntu page on Docker Hub. The same container that a developer builds and tests on a laptop can run at scale, in production, on VMs, bare metal, OpenStack clusters, public clouds and more. Download automated build from public Docker Hub Registry: docker pull dockerfile/ubuntu. I hope now you will be friendly with docker basic. Artifactory Docker images can be pulled from Bintray and run as a Docker container. It's easy to use and a great resource featuring excellent Docker images. Supported Ubuntu releases are available as separate apps: Ubuntu 16. The Docker Hub and other third party repository hosting services are called registries. It would be fantastic if those Windows Server base images on the Hub had a free-to-use license, so projects like Umbraco, ProGet and IdentityServer could package free versions as Docker Hub images. There are two possible solutions to this problem. This command obtains the different image layers and merges them into an image that can be executed within the platform. 04 How To Install and Use Docker on Ubuntu 16. Build Docker Images with DockerFile. Do Not Confuse: Docker can't run images themselves. docker pull ubuntu. Once you have your Docker. Once you’re on the site, find the “Register” button and click it to sign up for an account. we will be pushing our built image to the registry so that we can use it anywhere. com:~# docker search ubuntu NAME DESCRIPTION STARS OFFICIAL AUTOMATED ubuntu Ubuntu is a Debian-based Linux operating s. For example, below command will search all images with Ubuntu and list as output. docker/docker-install. 04; An account on Docker Hub if you wish to create your own images and push them to Docker Hub, as shown in Steps 7 and 8; Step 1 — Installing Docker. Mechanisms for easily running multiple processes, without violating the Docker philosophy. Follow the steps mentioned below. The key point is the docker container, which allows me to run Redis on Windows, even if the Redis project does not officially support Windows. So, you will need to add the repository for that. /bin/echo ‘Hello world’ is the command that will run inside a new container. If running on a Systemd based Linux distro (Ubuntu 16. Setup Docker Hub. If the image does not exist locally, then the image is pulled from the public image registry – Docker Hub. Feature image by _jinnie_ from Pixabay. Then get Ubuntu 18. In progress, subject to change. For example, below command will search all images with Ubuntu and list as output. Install Docker. 「Minimal Ubuntu 18. The Docker daemon pulled the "hello-world" image from the Docker Hub. The Ubuntu image was downloaded from DockerHub/Docker Registry. Do Not Confuse: Docker can't run images themselves. This is going to create a Ubuntu core image in your system, which would enable you to play with Docker and Ubuntu Core on POWER. Login to docker hub; Now login to Docker Hub. This script is ONLY FOR A FRESH OS, It will install Apache, MySQL 5. Because you can access GPUs while using a Docker container, it's also a great way to link Tensorflow or any dependencies your machine learning code has so anyone can use your work. 2005-08-30. As you probably remember from grade school math class, primes are numbers that are only divisible by 1 and themselves. Tip If you want to try the SQL Server 2019 preview image, see the SQL Server 2019 preview version of this article. The TensorFlow Docker images are already configured to run TensorFlow. Once you’re on the site, find the “Register” button and click it to sign up for an account. 04 の Docker イメージを取得しましょう。. Operations on Docker Images. A list of all published Docker images and tags is available at www. good instructions, including docker-compose with a postgis server; QGIS community is on Docker Hub but not with a QGIS image timcera/qgis-desktop-ubuntu timcera, 3rd party. com:~# docker search ubuntu NAME DESCRIPTION STARS OFFICIAL AUTOMATED ubuntu Ubuntu is a Debian-based Linux operating s. To install Docker on Ubuntu, perform the. This command obtains the different image layers and merges them into an image that can be executed within the platform. cn/ ,之后点击 Apply 保存后 Docker 就会重启并应用配置的镜像地址了。. 10 or newer. As you probably know, Docker is a fast, lightweight, OS level virtualization technology for developers and system administrators who wants to build an application with all of its dependencies, and ship it all out as only one package. By the end of this article, you will know how to use Docker on your local machine. 04 with PostgreSQL database server. Just like git repo hosting services, a Docker repository can be public or private. Provided you installed GitLab using docker-compose, all you have to do is run docker-compose pull and docker-compose up -d to download a new release and upgrade your GitLab instance. Cleaning up. Docker is an essential component of Automation, CI/CD & DevOps. sh # # NOTE: Make sure to verify the contents of the script # you downloaded matches the contents of install. If you've been diving into. Docker Hub is the cloud-based Docker repository for public to distribute the images over the internet, the images you upload on it become public, and it will be available to everyone to download and use. docker run --name mycontainer -it imagename /bin/sh To start a container in the background docker run --name mycontainer -d imagename tail -f /dev/null To 'enter' a running container: docker exec -it mycontainer /bin/sh /bin/sh exists in Alpine Linux, Oracle Linux and Ubuntu. For example, Microsoft releases images for. 10 (non-LTS) and newer versions. To connect and run the downloaded and running Ubuntu image, we enter the following command: docker run --interactive --tty ubuntu bash. io/docker | sh. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading.