Dit vs itd docker run. -dit Run the container in the background -it Run the container in the foreground and will allocate a pseudo-terminal. 拉取 ubuntu 镜像并在前台启动一个容器。 2. The following example starts an Alpine container running top in detached mode, then attaches to the container; $ docker run -d --name topdemo alpine top -b $ docker attach topdemo Mem: 2395856K used, 5638884K free, 2328K shrd, 61904K buff, 1524264K cached CPU: 0% usr 0% sys 0% nic 99% idle 0% io 0% irq 0% sirq Load average: 0. k. For example it is not possible to mount a directory via fuse as a user without a name. Oct 4, 2022 · Rather, they run on top of the host operating system. -d could also be written as --detach). (Source provided below. The "docker run rm " command makes us run a new container and later when our work is completed then it is deleted by saving the disk space. We're using a few extra flags with docker run here. For example, for a command like. docker build -t my-node-app . I was just going through this tutorial on Youtube, trying to understand the use of the -v option at the run command. SYNOPSIS¶ podman run [options] image [command [arg …]] podman container run [options] image [command [arg …]] DESCRIPTION¶ Run a process in a new container. Additionally, appending attributes to the command's basic syntax allows the user to customize container storage, networking, performance, and other settings. Oct 29, 2023 · docker run = docker create + docker start. May 8, 2024 · The primary difference between the docker exec and docker attach command is that the docker exec executes a command in a new process. In this section, you learned how to run tests when developing locally using Compose and how to run tests when building your image. From our understanding thus far, both virtual machines and Docker containers provide isolated environments to run applications. Jan 19, 2017 · docker run -d ubuntu bash Container will immediately exit. ) And add --rm to docker run if you want the container removed automatically when it exits. If you run the container as daemon (-d) and tell it to wait for interactive input (-it) it should stay running. Jun 10, 2016 · So there is very small difference between Docker run and docker start, by default Docker run is going to show you all the logs or all the information coming out of the container. Jan 29, 2017 · I've used docker run -it to launch containers interactively and docker run -d to start them in background. 13 the docker run command was only available. Apr 10, 2017 · For example, if you want to run a DHCP server then you need to be able to listen to broadcast traffic on the network, and extract the MAC address from the packet. docker create your-image creates a container from your image from step 1. But we’ve also passed in two flags: -t and -i. Docker vs VM – A Comprehensive Comparison 1️⃣ Virtualization. However, now I've noticed that docker run -dit (or docker run -itd) is quite common. Run the Container in the The docker run command can be used in combination with docker commit to change the command that a container runs. Run your container using the docker run command and specify the name of the image you just created: Aug 27, 2015 · Here we’ve again specified the docker run command and launched an ubuntu:14. We will now start a new container in the background. In fact, the docker run command can even pull an image from Docker Hub if it doesn’t find the mentioned image on your system. I’ll explain in detail what the above two commands do and what is the -it option in the docker run and exec command. RUN command: When you use a RUN command in your dockerfile, it always creates a new intermediate image layer on top of the previous ones. Along with having something along the lines of : ENTRYPOINT ["tail", "-f", "/dev/null"] in your docker file, you should also run the docker container with -td option. If we run this multiple times, we’ll see that the image created entry stays the same. podman-run - Run a command in a new container. The -t flag assigns a pseudo-tty or terminal inside our new container and the -i flag allows us to make an interactive connection by grabbing the standard in (STDIN) of the container. Mar 18, 2024 · Overview. Now that we have seen multiple ways of using the “docker exec” command, you may wonder what is the difference with the “docker run” command. 4. Under the Containers key, each connected container is listed, along with information about its IP address (172. Also Read: Top 10 DevOps Certifications for Professional Growth. sh Then you should be able to run. Hey guys, I am trying to understand why -i -t makes a container stay in active state. Docker document mentioned docker exec means run a command in container . dockerイメージのバージョンを指定する. 06 0. 在后台运行 ubuntu 容器并返回容器 ID。 3. converts your Dockerfile into an image. The -t flag assigns a pseudo-tty or terminal inside our new container and the -i flag allows us to make an interactive connection by grabbing the standard in (STDIN) of the Apr 13, 2020 · -dit is a short-hand notation for -d -i -t. The CLI commands were then refactored to have the form docker COMMAND SUBCOMMAND, wherein this case the COMMAND is container and the SUBCOMMAND is run. The optional i tag means "Keep STDIN open even if not attached" . 0. So for example, you run a new container using the following command: docker run -it --name mycontainerinstance myimage This creates a new container based of your image myimage. 15 0. sh"] this is the code of start-service. So what is the difference? Jul 22, 2019 · In a normal scenario, there is the only one difference. 1). Similarly, Docker uniquely names all containers at Jan 10, 2017 · Using the --restart flag on Docker run you can specify a restart policy for how a container should or should not be restarted on exit. Prior to docker 1. docker/getting-started Specifies the image to use. Step 1: Check if the image exists locally. $ docker run -dit --name = my_container ubuntu bash Oct 24, 2023 · I do like the basic idea of Docker. docker run -d \ -p 9080:9080 \ -p 9443:9443 \ -p 2809:2809 \ -p 9043:9043 \ --name container_name \ myimage:latest Jul 1, 2024 · Docker run command is a combination of creating and start as it creates a new container and starts it immediately. 交互式运行并分配终端. You can see active containers with docker ps (all with docker ps -a). Run the docker ps command to list the running containers. Running a Couple of Alpine Containers. However, it does not seem to do so regarding its networking behaviour. ) The image is not a file like our normal programs and files; Docker stores it in a specific location that isn’t commonly accessed, so it’s necessary to use the special docker image command to see what Docker images you have on your computer. docker ps docker ps gives you a container ID. In fact, I need do these things in a bash script: docker run -it ubuntu bash docker run -it centos bash But it does not work. Run the Docker Container. The first step that Docker takes when you run the docker run command is to check if the image you specified exists on your local system. So the container starts up and run in background. at the end of the docker build command tells Docker that it should look for the Dockerfile in the current directory. From what I saw on different images there seem to be mainly three different approaches: Using RUN git clone in a Dockerfile and build the image each time the source code changes. sh", "container started"] After building the image, let’s now run it and check the output: $ docker run myimage Fri Sep 18 18:27:49 UTC 2020 image created Fri Sep 18 18:34:06 UTC 2020 container started. A list of all docker container run options can be found on the Docker documentation page. The command passed by run overrides the command defined in the service configuration. After you select enter, the Docker CLI will send the run command and any command-line arguments to the Docker daemon via REST API call. That means, you start up the container and could use the console after startup for other commands. Now you know when you need to use Run / Create Sep 30, 2020 · To start a docker container with the current user I can call docker run with the --user parameter like. 参数说明： Jun 21, 2015 · If in the host where docker is running was executed the docker run --name <containername> -itd ubuntu command and then: if in the host is opened for example two tty and is executed for each one the docker attach <containername> command then these two tty share the same output according if any of them is used - even for typing at realtime Dec 12, 2023 · 在每次的run docker的时候，都想知道到底有多少个配置参数，今天搂一搂 将自定义主机添加到IP映射中。格式为host:ip --add-host list通过指定--add-host参数，可以将自定义的主机名与相应的IP地址关联起来，以便在… Finally, you will explore how to publish your image on Docker Hub, enabling you to share your work with the broader community and leverage Docker's powerful ecosystem for collaborative development and deployment. ; The docker run doc does mention:. docker run --name webserver -p 80:80 -d nginx. Mar 10, 2023 · The ‘docker run’ command is used to create and start a new container from a Docker image. There is additional detailed information about docker run in the Docker run reference. To do this, I will run the last command but this time, I’ll include the -d option. They allow containers to start in different modes suited to your particular use case. docker run -p <host_port>:<container_port> <image_name> Run a container in the background docker run -d <image_name> Start or stop an existing container: Feb 20, 2024 · 而 docker run 命令则是使用 Docker 进行容器管理的核心命令之一。本文将深入探讨 docker run 命令的使用方法，旨在帮助初学者快速入门并掌握该命令的各种用法。 Docker Run 简介. How to run docker container. Try it out. With docker ps -a you should see some exited ubuntu containers. 13 syntax is still supported. py. 0 Let’s walkthrough this short script. -d option is mostly used when you have defined some operations with a Dockerfile and you don't want to interact with the container. . CMD does. Various options in the Dockerfile give defaults that can be overridden at docker run time. When you rebuild an image, a new image with a new id is created. May 26, 2016 · So RUN uses the files from your build environment (development box) used to CREATE the docker image, while CMD defines the startup commnand when the docker image is loaded. 17. Dec 29, 2022 · docker run -it --rm -p 8080:80 imagename --env-file . 5. Set up Docker Desktop; Run your first container; Build your first image; Publish your image on Docker Hub; Modules Mar 13, 2024 · In the world of containerization, Docker has emerged as a dominant force, simplifying the way developers build, ship, and run applications. Nov 22, 2016 · Here is what run. This command builds the image and tags it as my-node-app. "the Docker daemon prepares the image as an Open Container Image (OCI) bundle and makes an API call to containerd to start the OCI bundle. Dec 6, 2019 · If you want to avoid tagging, docker build -q outputs nothing but the final image hash, which you can use as the argument to docker run: docker run -it $(docker build -q . Another way to think of it is that once a docker image is built, RUN doesn't run anymore. docker run is the command to run a container from an image. This information is lost during the port forwarding process, so the only way to run a DHCP server inside Docker is to run the container as --network=host. The value you see in the help text is the default value which is set if you do not specify that flag. When it comes to executing mysql command in Docker container, the tutorial shows this command docker exec -it mysql1 mysql -uroot -p. Jun 6, 2020 · docker container run [OPTIONS] IMAGE [COMMAND] [ARG] The old, pre 1. docker run -it ubuntu /bin/bash. Get the source code to the host and use docker run -v To learn more about building and running tests, see the Build with Docker guide. The docker run command first creates a writeable container layer over the specified image, and then starts it using the specified command. docker run -d -p 80:80 docker/getting-started This command contains the following parameters:-d Run the container in detached mode, in the background. I have been using docker to build my images and spin up some containers and do understand the concept of containerization fairly well. Example : I want to run tomcat server in a docker container, the default port of tomcat is 8080 and I want to expose my docker on port 9000 so i have to write : docker run ubuntu. 在 Docker 容器退出时，默认容器内部的文件系统仍然被保留，以方便调试并保留用户数据。 但是，对于 foreground 容器，由于其只是在开发调试过程中短期运行，其用户数据并无保留的必要，因而可以在容器启动时设置 --rm 选项，这样在容器退出时就能够自动清理容器内部的文件系统。 Docker runs processes in isolated containers. podman run starts a process with its own file system, its Sep 13, 2019 · Docker Tutorial for absolute Beginners: Run multiple docker containers explained step by steo In this hands-on run-through you are going to learn how containers are separated. Think of it more like you have ssh'ed into a remote m/c having the image and started the container. By default Docker start is the opposite Docker start is not going to show you information coming out of the terminal. Start an app container. CMD in the Dockerfile, for example, will be overridden by anything in a docker run command after the image name. Jul 3, 2024 · The `docker run` is used to create a running container from using a docker image. I was trying to implement MySQL using Docker container. Examples Attach to and detach from a running container. What you'll learn. These two options seemed exclusive. Oct 24, 2018 · I am new to Docker. /whatever in the Dockerfile. In this hands-on, you will see how to run a Docker container using the Docker Desktop GUI. Block until one or more containers stop, then print their exit codes. Jul 9, 2024 · Navigate to the directory containing your Dockerfile and run: sh. In addition to what containerd offers, Docker adds some significant features. Nov 10, 2015 · docker run [] <imageId> takes that image and starts a container. This is facilitated by a container engine. /env. Under the hood, docker run command is an alias to docker container run. May 30, 2024 · In the terminal window or a Bash window, run this command. Now this Container Id can be used to refer to the container created. The host may be local or remote. Sep 8, 2017 · The primary difference is that when you COPY the bash script into the image it will be available for inspection in the running container, whereas the RUN command is a little more opaque. -p 80:80 Map port 80 of the host to port 80 in the container. It simply means that a terminal is allocated which you can use to interact with container. docker start container_id starts the container from step 2. Here is the difference between image and container: Jun 1, 2020 · The first port : the Docker host ( you can use this port to access to your container) to access to the container from the outside. This is particularly useful when the container runs on a remote m/c. docker run --rm -it $(docker build -q . It offloads a lot of it to containerd. Feb 27, 2024 · Docker run -d: Start a Docker Container on the Background . -d -it is the command for daemon (running tasks in the background) and interactive terminal (giving us a way to interact with the Dec 13, 2021 · Using Docker CLI to Run Containers and Build Images. g. As mentioned in the title, I’m encountering a weird scenario where in when I run it using docker run -dit, the service runs in the background, but when I use a docker-compose. $ docker run docker/whalesay ls -l total 56 -rw-r--r-- 1 root root 931 May 25 2015 ChangeLog Oct 12, 2018 · I am very new to Docker and also to Unix/Linux world. When you execute docker run, the container process that runs is isolated in that it has its own file system, its own networking, and its own isolated process tree separate from the host. docker run 命令用于在 Docker 中运行一个容器。它可以基于指定的镜像创建并启动一个新的 Dec 23, 2018 · 1. list -it --rm -p 8080:80 imagename The reason this is the case is because the docker run command has the below signature. To be clearer, I have this entrypoint in my Dockerfile: ENTRYPOINT ["/data/start-service. Jul 13, 2023 · 「docker run」コマンドの使用方法について理解したいですか？「docker run」はDockerコンテナーを起動する基本的なコマンドで、システムの基本設定やアプリケーションの運行に役立ちます。当記事では、「docker run」の使用法を具体的なコードと共に詳細に解説しています。Docker初心者の方は必見 Docker runs processes in isolated containers. sh: #!/bin May 19, 2020 · You can start a docker container in detached mode with a -d option. Oct 11, 2015 · As mentioned in docker-compose run (2015). (docker create image and docker start container_id). Jan 28, 2022 · Running Docker inside Docker (a. Why is the author using the -v option? He uses the command, like so: docker run -v /var/lib/mysql --name=my_datastore -d busybox echo "my datastore" Now I understand the above command to an extent: 从上一篇文章可以看到，使用docker最简单的方式就是docker run了。想要运行什么服务，就run相应的镜像。 以下的内容基于Linux环境. a. py overrides it with python app. For information on connecting a container to a network, see the “Docker network overview”. It can also be useful to use docker events to see the restart policy in effect. 安装完成后，我们可以使用以下命令来运行 mysql 容器： $ docker run -itd --name mysql-test -p 3306:3306 -e MYSQL_ROOT_PASSWORD=123456 mysql. If it does not, Docker will pull the image from the I am able to run arbitrary shell commands in a container created from docker/whalesay image. dockerfile, how to support docker run options -d, -v and -p? 2. While running Docker containers, we’ve always come across the -i and -t options whenever we want to drop into the shell of a running container. The -d flag makes the Docker CLI detach from the container, allowing it to run in the Jul 8, 2020 · Practically, what is the difference between docker run -dit(-itd) vs docker run -d? 1. If you want to know why they used the term pseudo-TTY, then you should read about the history of Unix, tty, physical terminals which were used to access computers back then etc. 2 for alpine1 and 172. For example, if the web service configuration is started with bash, then docker-compose run web python app. Get the source code to the host and use COPY . If no errors occur while starting the container, we’ll be back to a running container status. Dec 27, 2023 · Some common examples of using docker run with options: docker run -d nginx # Detached mode docker run -p 80:80 nginx # Map port 80 docker run --rm nginx # Remove automatically. However, instead of provisioning one machine to run one application, a VM with a container runtime can run multiple containerized applications, increasing resource utilization and reducing costs. Start a container in the background. This makes it easier to move applications between different environments, including local development machines, testing servers, and different cloud platforms. Feb 13, 2019 · Single character command line options can be combined, so rather than typing docker run -i -t --name test busybox sh, you can write docker run -it --name test busybox sh. docker run --always Mar 10, 2020 · Build an image based on the Dockerfile: docker image build . docker run -d ubuntu. docker run也支持简单的自定义参数，比如这个镜像以什么方式运行，要不要分配网络端口、存储空间之类的。 Aug 31, 2017 · I’ve been porting a web service to docker recently. Copy code. For example, it automatically downloads an image from a remote repository if it’s not locally present when docker run or docker build commands are invoked. The basic syntax of the ‘docker run’ command is as follows: docker run [OPTIONS] IMAGE [COMMAND Jan 14, 2016 · run runs an image; start starts a container. So Docker is a middleman, accepting commands from humans and then producing a result. This time, the container starts but does not hold on to the terminal. 古いDockerイメージを利用したい？ならそのバージョンを指定してやろう。 $ docker run -it #{利用したいイメージ}:#{利用したいバージョン} /bin/bash これで君 Feb 12, 2019 · A better design would be to set up your Docker image so that its default CMD launched the actual command you were trying to run. 指定容器名称. Boolean options take the form -d=false. Jan 7, 2017 · This is what you will see when you run docker images. But remembering this Container Id can be difficult. The --name parameter is then used when you create and start a new container based of your image. The . sh or /bin/sh will run it right. You can use it or just the 2/3 first characters to go into your container using: docker exec -it container_id /bin/bash Apr 16, 2020 · You must use docker ps to see containers running id, status etc, you can also use docker run -it image_name bash if you want to run commands through your terminal inside the container. Aug 26, 2020 · docker run -d repository docker run -d repository:tag docker run -d image_id Then you can check your container is running using. Description. I have a, unfortunately rather complex Docker Run vs Exec. Examples. docker run image is a shortcut for 2. – Jul 14, 2017 · It's likely docker run did work, but since you did not specify any command to run, the container stopped working just after starting. ) Instead, you want to set up a way for your main container to produce and communicate with sibling containers. sh", "image created"] CMD ["/log-event. It would be great if it would work in exactly the same manner as docker run. 以交互模式运行 ubuntu 容器，并启动一个 Bash shell。 4. Now that you have an image, you can run the application in a container using the docker run command. Near the top, information about the bridge network is listed, including the IP address of the gateway between the Docker host and the bridge network (172. So we can use --name in docker run Jun 14, 2022 · Docker engine just does some high level things itself like accepting user commands, downloading the images from the docker registry etc. To better understand this interaction, let’s talk about what happens when you run the docker run command:. This page details how to use the docker run command to run containers. docker ps Jun 24, 2023 · Default Image(sample_docker_run) command: echo "Hello, this is my custom image for Docker run command guide!" Docker run command section that overrides the existing one: echo "Hello, this is the custom image that has to override the defined command of docker image. At the core of Docker's functionality are Docker images, lightweight, standalone, executable packages that contain everything needed to run a piece of software, including the code, runtime, libraries, and dependencies. Dec 8, 2020 · Note that the downloaded hello-world image is not in the folder where you are in the terminal! (Run ls by itself to check. That’s why it is always recommended chaining all the RUN commands together. docker run --env-file . Jul 26, 2022 · And, at the right, we have some actions performed by Docker, such as building a container, pulling an image, or starting a container. RUN command in executable form is: Aug 28, 2019 · Because --name doesn't have a shorthand version. 04 image. 后台运行容器. Related information: docker compose run; Build with Docker guide; Next steps Mar 19, 2024 · RUN ["/log-event. y COPY CMD myapp. It's a common concept in tools to offer a short and a long version of providing command line arguments (e. If you want to run a docker container with a certain image and a specified command, you can do it in this fashion: docker run -it -d --name container_name image_name bash May 29, 2016 · docker build . 在上图中可以看到我们已经安装了最新版本（latest）的 mysql 镜像。 4、运行容器. You can see that the options come before the image name. Boolean. The result of above is docker run --rm -ti <IMAGE_ID> --rm : If instead you’d like Docker to automatically clean up the conta Dec 11, 2017 · When you docker run bash in a container, -it and -itd behave differently as follows: With -it, docker run gives you the bash prompt immediately. docker run --name [root@localhost opt] # docker run --help Usage: docker run [OPTIONS] IMAGE [COMMAND] [ARG] Run a command in a new container Options: --add-host list Add a custom host-to-IP mapping (host:ip)-a, --attach list Attach to STDIN, STDOUT or STDERR --blkio-weight uint16 Block IO (relative weight), between 10 and 1000, or 0 to disable (default 0)--blkio-weight-device list Block IO weight (relative Apr 12, 2022 · docker run -dit --name ata-app1 --network ata-app-net alpine ash. A container is a process which runs on a host. Dec 6, 2023 · docker run -it ubuntu bash # Output: # root@container_id:/# In this example, we use the ‘docker run bash’ command to start a new container from the ‘ubuntu’ image and run a Bash shell inside it. Mar 19, 2024 · In case a container is down, we may want to start it again using docker start: docker start 52b7c79bfaa8. However, sometimes I do see some people spinning up containers using flags like : docker run -i -t imagename Single character command line options can be combined, so rather than typing docker run -i -t --name test busybox sh, you can write docker run -it --name test busybox sh. With -itd, docker run exits immediately, but you can docker attach after that and get the bash prompt just as if you had just done docker run -it. But, what do the two actually do? Furthermore, what does it mean when Docker errors with the message “input device is not a TTY”? The host may be local or remote. $ docker images. Summary. In this article, we will explain the docker run command step-by-step. ) Jan 24, 2019 · I would like to know why docker -i -t -d centos /bin/bash makes a container run in background while docker -d centos /bin/bash make a container go to exit state. Sep 23, 2015 · How can you just start a script like this docker run -ti test /file. containerd then starts the Oct 3, 2022 · We can use following commands to runs docker container in detached mode and print “Hello World” every one second:-docker run —name <contName> -d <imgName> /bin/bash -c “while true; do echo Hello World; sleep1; done” If we want to cross check if the container is running, we can use this command. It is used with options, docker images, commands, and arguments. The -it flag tells Docker to run the container in interactive mode, and ubuntu is the name of the Jul 9, 2018 · They are exactly the same. You may see that through docker images. Also read: Container (Docker) vs Virtual Machines (VM) to understand what is their difference. sh abc. " Jun 18, 2024 · Let’s now try to understand the RUN, CMD, and ENTRYPOINT commands in-depth. Jan 1, 2018 · The Docker run command documentation refers to this flag: Full container capabilities (--privileged) The --privileged flag gives all capabilities to the container, and it also lifts all the limitations enforced by the device cgroup controller. It’s typically used for starting an interactive shell in a running container, or to execute arbitrary commands in the container environment. 3 for alpine2). Oct 16, 2020 · はじめにDockerについて初心者の自分が理解するのに難しかった部分を少しまとめます。特に、コマンドオプションのところが難しかったので少しでも自分と同じようなDocker初心者の方の理解の助… Create and run a container from an image, with a custom name: docker run --name <container_name> <image_name> Run a container with and publish a container’s port(s) to the host. When a restart policy is active on a container, it will be shown as either Up or Restarting in docker ps. Usually -i -t (or -it) is used to run a container interactively, but it can also be used to run a container "detached" (-d) (in the background) for situations where the container's process expects a TTY (-t) to be attached to keep running. Image name feels like an option but it is a parameter to the run command. 1. dind), while possible, should be avoided, if at all possible. docker run --user $(id -u):$(id -g) myimage However that leaves the user inside the container without a name which inhibits the execution of some programs. Oct 8, 2021 · As you mentioned, -t or --tty allocates a pseudo-TTY. 5 days ago · Once you've created your image, you can start a container using docker run: docker run -d -p 8080:80 my-website:v1. 01 Jan 28, 2017 · $ docker run -e #{環境変数名}=#{値} -it #利用したいイメージ} /bin/bash. What is the difference between --name and --hostname in docker run command? Answer: When we use docker run command docker creates a container and assigns a Container Id of type UUID to it. yml, the service exits. After building the image, you can run a container using the docker run command: sh Mar 27, 2024 · How Docker interacts with containerd. However, using it is cumbersome, at least sometimes. As you can see, options start with either a dash -like -d or double dash --like --rm. If you used the tag above, docker run -it superuser/bestimage:latest may be used. What I need is keeping the container run, and I can use exec to login into this container. In the example you give, you shouldn't need either the -v or -w option. Jul 11, 2024 · The docker run command lets you create and execute OCI-compatible containers using container images. and 3. docker-compose seems to offer a great opportunity to start-up a solution which is based on a set of Docker containers. sh looks like: docker run -d -it -p 80:8080 --name=kz kangzeroo npm run ec2 -- --host=0. Docker also provides the docker restart command, which combines stop and start into a single command. list Fix. docker run --name mysql_2 -e MYSQL_ROOT_PASSWORD=test -d mysql. [Video included] Oct 23, 2023 · They can run on any system that supports the container runtime, such as Docker, regardless of the underlying operating system. On the other hand, the docker attach command does not start any new Oct 27, 2015 · I would like to know how you get data (primarily source code) into your containers. Lost? Don’t worry. It is used for developing, shipping, and running applications in containers. The important thing to note is, the container is just like a class instance and not for data storage. the second one : is the port used by your application. FROM some_base_image:x. For example, RUN could build an executable, while CMD might run it. Users are encouraged to use the new command syntax. I feel that the script wont run because it should be docker run -ti test sh /file. The difference between “docker run” and “docker exec” is that “docker exec” executes a command on a running container. yqucuuzcnlqihfmqibcqivsphurwasfbrcmykrzrvtmjbwhjlyit