Docker entrypoint multiple commands

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Entering the docker run parameters each time can be quite tedious. So if you specify CMD date without specifying entrypoint, Docker executes it as /bin/sh -c date. Jul 1, 2014 You can see this when you run build command. If you want to use a particular network on a common build, use [network] as mentioned in the second yaml file example. DockerFile is a script that houses instructions needed to create an image. yml – instead of your dockerfiles. In this example, we will use port 80 for HTTP, and port 443 with HTTPS that will handle TLS termination. Docker can build images automatically by reading the instructions from a Dockerfile, a text file that contains all the commands, in order, needed to build a given image. In my case, I want to setup docker in docker in jenkins slave node, so I pass the docker. FROM tells Docker which image you base your image on (in the example, Python 3). Cannot start any container because of missing entry point. Docker Hub Now, when we work with the docker client, commands are being sent to the Docker Daemon, which then interprets the command and executes it for you. This image is  Aug 21, 2016 Usually when we define a Dockerfile we specify such an entry point as (one . sock into container, and I want to change the permission to be executed by normal user, so it shall be done before sshd command. Use the --entrypoint flag to override ENTRYPOINT: docker run --entrypoint [my_entrypoint] test Anything after the image in the docker run command overrides CMD: Docker difference between run, cmd, entrypoint commands If you have built a docker image, you would be familiar with the commands RUN, CMD, ENTRYPOINT. -p — Publish host IP and host port to the container port (e. I'm sure it's simple but I'm pulling my hair out. Are there any simple solution to run two command inside without extra script. so the entry point must start your docker container with the required command mentioned. CMD tells Docker to execute the command when the image loads. Commands. If you're trying to run multiple processes, consider using something like supervisord However, the implication from your example is that you're trying to use some kind of init system for your cmd. Since this Docker container is planned to be used as an executor for the ab command, On Linux you can run docker containers natively, but on OSX and Windows you need a layer of abstraction. So in the OPs example docker-compose run image bash -c "cd /path/to/somewhere && python a. In the Dockerfile, we are simply using the ubuntu:latest image as our base container image, installing the apache2-utils package, and then defining that the command for this container is the ab command. Docker multiple entrypoints. Use multiple Docker Compose files when you want to change your app for different environments (e. / | grep -v '<excluded>')" The command you are trying to run will perform the expansion of the subshell $() on your host because it is inside double quotes. Or, we can leverage docker-compose to encapsulate our comamnds. An env_file, is a convenient way to pass many environment variables to a single command in one batch. answered Dec 10, 2018 by Shrishti Typically, dockerfiles require a single entrypoint or single command. py" Best practices for writing Dockerfiles Estimated reading time: 24 minutes Docker can build images automatically by reading the instructions from a Dockerfile, a text file that contains all the commands, in order, needed to build a given image. sh to ensure the outer shell process gets ditched and Redmine properly becomes PID 1. For example bash file may commands. I'm having problems issuing multiple commands: command: bundle install --jobs 4 --retry 3 && bundle exec spring binstub --all && bin/rake log:clear && bundle exec docker-rails-db-check && bin/rake db:rebuild_test. docker run image cd The issue seems to be with the entrypoint script /docker-entrypoint. That's a manifestation of not adhering to the "one process per container" idea. 0 . But since Docker allows only a single ENTRYPOINT (to be precise, only the last ENTRYPOINT in the Dockerfile has an effect), you need to find a way to run multiple processes (the tunnel and the application) with a single command. As such, it’s familiar to anyone starting or running Docker containers on a daily basis. It simplifies the deployment of an image by easing the entire image and container creation process. You can see that when the container starts up, the command portion is interprated to be sh -c 'docker-entrypoint. If a relative path is provided, it will be relative to the path of the previous WORKDIR instruction. com rosskevin commented Sep 11, 2015. Sometimes we need to execute multiline shell commands in entrypoint element of docker-compose file. A docker machine will spin a very lightweight virtual machine that integrates with the docker command line utilities really well. As the operator (the person running a container from the image), you can override that CMD just by specifying a new COMMAND. ) In the Dockerfile builder, ENTRYPOINT and CMD run in one time by using /bin/sh -c in back. MAINTAINER This command is the command that declares the author of the image. A Dockerfile should have at least one CMD or ENTRYPOINT instruction. [options] — Add options to your Docker commands to change the results. Dockerfile is not yet-another shell. "  Sep 18, 2018 If your application needs multiple components, i. These instructions include identification of an existing image to be used as a base, commands to be run during the image creation process, and a command that will run when new instances of the container image are deployed. sh executes all the scripts under docker-entrypoint. Unknown switches '--all'. Extract from docker-compose file: multiple Docker multiline CMD or ENTRYPOINT dockerfile example (1) It was a typo in the dockerfile. Command line syntax. As a result the container is started by Docker with the command  The command can be a bash script that executes multiple commands. In this article we will discuss how to create docker images from the Docker file. CMD and ENTRYPOINT are confusing. Docker builds images automatically by reading the instructions from a Dockerfile-- a text file that contains all commands, in order, needed to build a given image. Every commands, either passed as an argument or specified from CND instruction are passed as argument of binary specified in ENTRYPOINT. But, you should not because it breaks the single responsibility principle: one  Mar 22, 2016 When a Docker container starts, it calls its entrypoint command. I know how to use 'supervisor' figure out this. Entrypoint option does not support multiple commands separated by && or ; #5855 santagada opened this issue Aug 31, 2016 · 10 comments Comments WORKDIR. Setting ARG and ENV values leaves traces in the Docker image. Don’t use them for secrets which are not meant to stick around (well, you kinda can with multi-stage builds). Apr 7, 2019 I originally was using one RUN command per shell line that I wanted to exectue: be used to carry the same command across multiple lines for readability). I want to also be able to start mongod when the the container starts with the command service mongod start. It’s often the first Docker command we learn. Therefore, calling docker build command docker read the instructions from Dockerfile and bundle the docker image. Difference between CMD and ENTRYPOINT. Since this Docker container is planned to be used as an executor for the ab command, Multiple commands in Docker CMD directive. What you may want is an ENTRYPOINT that point to a script like this; What you may want is an ENTRYPOINT that point to a script like this; Running multiple programs in a Docker container from the command line Posted: 27th February 2015 by Tim in Docker , Ubuntu Tags: command , command line , docker , excute , exec , execution , run , terminal , Ubuntu On Linux you can run docker containers natively, but on OSX and Windows you need a layer of abstraction. 8. If you use the docker-compose command, use network_mode instead. The final arguments in the docker run command are passed as arguments to the command defined in ENTRYPOINT. This command has pid 1. How to properly override the ENTRYPOINT using docker run. Creating Docker images using Docker file is similar to template concept of Virtualization world. GitHub is home to over 36 million developers working together to host and review code, manage projects, and build software together. , it is Often you will find multiple RUN instructions in a Dockerfile. Then try to build it with docker build command . Closing, given the excellent solution posted above. Build Arguments The docker test command syntax will be similar to docker run command, with one significant difference: a new “testable” image will be automatically generated and even tagged with <image name>:<image tag>-test tag (“test” postfix added to the original image tag). If I override the entrypoint then arg gets added: $ docker run -itP --entrypoint bash uwsgi_app:0. sh is as below: I want start the redis server and shellinabox both when docker start. Sets the working directory for any RUN, CMD, ENTRYPOINT, COPY, and ADD instructions that follow it. The docker run command is the command used to launch Docker containers. Traefik is configured in three parts. Thus an ENTRYPOINT/CMD is any command that is started first inside the container when the container is run. sh"] However, I have to execute additional commands from users. use "docker images" to find the Docker Image ID or Image Name and use "docker rmi" command to remove or delete docker images. js commands or . sql file in my apps scripts folder, and I can delete all the volumes, containers and images but it always says "/docker-entrypoint. tar. [command] — Enter the parameters for the Docker command, this could be a filename or container ID. Figure A A Dockerfile, should just be called that, no extension, just name the file “Dockerfile” and that’s it, you are done. The Python script my_script. But, you should not because it breaks the single responsibility principle: one container, one service. Yours is a prime example - as currently implemented, the PostgreSQL container will run PostgreSQL's docker-entrypoint. This gives us one way to share common configurations. Do note the trailing period is necessary for each command. By now, you should know that entrypoint and COMMAND instructions can be placed in your docker-compose. Lets look at a CMD example. This means that normal shell processing does not happen and therefore variable substitution will not be applied. RUN tells Docker which additional commands to execute. ‘docker info‘ command is used to view the system wide information like Docker’s root Directory, OS version, Kernel Version, Docker Version, RAM, CPU and Docker Registry. Since Docker version 1. A Dockerfile adheres to a specific format and set of instructions which you can find at Dockerfile reference . If that's the case, consider using something like dumb-init or tini , which you can use as your entrypoint: After my docker start running, I need to execute some configuration. In Docker basic command section we deal with 3 components, and they are: 1. The following are two key issues that have arisen as a result of this diversity: New docker users tend to assume that if they do a docker run of an image, that it will […] Creating a Dockerfile. Just make sure you have Docker running! docker run. For quite some time now, the docker community has been grappling with the complexity of supporting multiple operating systems and architectures. The issue seems to be with the entrypoint script /docker-entrypoint. # Usage: MAINTAINER [name] COPY This command copies a file from your host OS to the docker container As noted for CMD and ENTRYPOINT, the exec form for CMD and ENTRYPOINT does not invoke a command shell. It is generally recommended that you separate areas of concern by using one service per container. In this article Docker can build images automatically by reading the instructions from a Dockerfile, a text file that contains all the commands, in order, needed to build a given image. Jun 12, 2018 We can use ENTRYPOINT instead of CMD within our Dockerfile's in by using the exec "$@" line if we pass any commands/arguments to the . [root@docker-host ~]# docker rmi 49f7960eb7e4 To remove multiple docker images, mention the docker images ID separated by spaces as below. A Guide on Docker Dockerfile and Example to Build Image. As the first part I put my own name takacsmark , because I’m the maintainer of the image, then I gave it a human readable name alpine-smarter and provided a version number 1. Per the official  If you want to launch several processes in a docker container. Dockerfile has its special mission: automation of Docker image creation. Example:3 Search Docker Images in its Registry Server With help of ‘docker search‘ command we search the docker Join GitHub today. g. When you run docker like this: docker run -i -t ubuntu bash the entrypoint is the default /bin/sh -c, the image is ubuntu and the command is bash. In fact, multiple CMD instructions are ignored and only the final CMD is  I believe the difference might have to do with, the the second command does shell processing, while the first does not. In fact, multiple CMD instructions are ignored and only the final CMD is executed. For example, docker run -it name:tag pwd > a; pwd > b The above command obviously won't work! ApacheBench Dockerfile. For example, a repository might have both a Java-based back-end API implementation and a JavaScript-based front-end implementation. It looks similar to CMD, because it also allows you to specify a command with parameters. sh’ not found or does not exist. The image can then be created based on the instructions in the DockerFile using the #Docker build command. on to the last option for running multiple NPM commands at once, Docker. you can see this if you docker inspect the image you are starting slimhs (Slimhs) February 21, 2018, 1:37am #10 I search through the net and I found that at the beginning docker-entrypoint. Every command has a basic structure. py looks like the following: Docker’s great, but it’s an extra layer of complexity that means you can’t always easily poke your app up close any more, and that can really hinder debugging. Each command has multiple options available. ApacheBench Dockerfile. dockerfile cmd run multiple command. when I start the docker and use ctrl +c the shellinabox begin start. to note that the postgres container reads “docker-entrypoint… Start Learning Docker →. Dec 22, 2016 CMD is the default command to be run by the entrypoint. If you specify a shell environment, also observe the command syntax conventions of the shell. As soon as you use /bin/bash as the entrypoint, that initialization script doesn't get run and you'll need to run it yourself. run processes multiple images entrypoint commands docker docker-image How is Docker different from a virtual machine? Should I use Vagrant or Docker for creating an isolated environment? Other useful flags to attach to the ‘docker run’ command are: -d — Detach container on start. Once, you write build instructions into Dockerfile, you can build the same image just with docker build command. Many of the Linux distro base images that you find on the Docker Hub will use a shell like /bin/sh or /bin/bash as the the CMD executable. This means that anyone who runs those images will get dropped into an interactive shell by default (assuming, of course, that they used the -i and -t flags with For anyone else who came here looking to do the same with docker-compose you just need to prepend bash -c and enclose multiple commands in quotes, joined together with &&. Your command is run with your args. 3 you are able to create a new instance of a shell using exec command: sudo docker exec -i -t 878978547 bash 9. sh for example. ex: docker run ubuntu:14. yml: entrypoint: ["sh", "-c", "cp  Jul 19, 2018 I'm trying to execute multiple commands like this. sh and set the ENTRYPOINT like . Docker Compose already reads two files by default: docker-compose. Using Docker-Compose to encapsulate our docker run parameters. The script checks if the first argument sent to it is equal to the string postgres , and if so, executes a series of instructions to set up a database. Here are some commands to try out on the command line. Using Docker logs command. multiple containers for differenct Docker Compose comes in the form of a command line command that you'll use to build, . . Let’s see how you can do it. If you still need to run multiple services in the same container I would recommend to use multirun: nicolas-van/multirun If you don't, docker tries to add the sh -c into the arguments that are appended, which could lead to some funky results. sh couch" 38 seconds ago Up 37 If multiple containers are running that have 0 as the starting number then the first few  Aug 24, 2018 When the YAML file is complete, you can run a single command to build, run, . Docker Command Line API has a special command to attach to a running container. dockerfile example I have a really long command line for the default process due to a number of arguments. The command line syntax varies depending on the Azure API or tool used to create the instances. Container command ‘docker-entrypoint. This will use shell LABEL description="This text illustrates \ that label-values can span multiple lines . Fact 7: ENTRYPOINT and CMD can be overridden via command line flags. sh like this Dec 27, 2016 I'm trying to copy some files before running my entrypoint script. We can use this ONBUILD instruction where you need a static base image with a dynamic config value that changes in a new image or we can use in a situation where a new image is depend on previous image. Let's add them to our Dockerfile Creating an OpenFlow Playground with OVS: A Homemade Mininet Alternative Select2 and Laravel: Ajax Autocomplete Using Docker to Run Multiple Elasticsearch Instances Implementing Infinite Scroll Pagination Using Laravel & jScroll How to Create an Ajax Pagination Using Laravel Generate a Simple XML Sitemap Using Laravel Docker is a widely used virtualisation technology that is based on the Linux-kernels network-namespaces-feature and works in conjunction with github repositories that provide a wide array of various distinct services that can be installed and run in virtual machines just by typing a single command. However, my last note was referring to a different -i (for /bin/bash, not docker run). The scripts exuctes only the first time when there is no persistant volume data. multiple Docker multiline CMD or ENTRYPOINT . The consequence is that environment variables set here will not available to the container when using the exec form. If you supply a command and args, the default Entrypoint and the default Cmd defined in the Docker image are ignored. According to the documentation however, there must be only one ENTRYPOINT in a Dockerfile. If you supply only args for a Container, the default Entrypoint defined in the Docker image is run with the args that you supplied. e. Commands for Ease of Automation. docker exec <container> /bin/sh -c "go test $(go list . google. docker run host_ip:host_port:container_port) -v — Define volume mounts to share storage volume across containers. WORKDIR command changes default directory, where we run our RUN / CMD / ENTRYPOINT commands. A major improvement of this approach over only using the Docker CLI is that the bash scripts are source controlled: the start-up scripts live in your Docker image, which is the new deliverable of you software project. Run multiple services in a container Estimated reading time: 4 minutes A container’s main running process is the ENTRYPOINT and/or CMD at the end of the Dockerfile. Docker compose is a utility to run multiple containers as a system of containers. docker build is the command to build a Docker image from a Dockerfile -t takacsmark/alpine-smarter:1. So if you specify CMD date without specifying entrypoint, Docker executes it as /bin/sh -c  If you haven't read Part 1, read it first and see Docker container concepts in a ENTRYPOINT — provides command and arguments for an executing container. Favor ENTRYPOINT when a container will be used as an executable program. ENTRYPOINT [". EXPOSE 5900 ENTRYPOINT exec top -b. The syntax for using built-in networks such as host and none is a little different. if you don’t want to see the output of that command in your terminal you can start the container in background mode by providing a flag ‘-d’. /init. Best idea is create an bash file. Docker Daemon 2. Only used if you use docker stack commands. The difference is ENTRYPOINT command and parameters are not ignored when Docker container runs with command line parameters. You could capture yet another script to call the commands that call the build script in the container. @marcellodesales yes, -ti and -t -i are the same thing to the docker run command. $ docker run [OPTIONS] IMAGE[:TAG] [COMMAND] [ARG] This command is optional because the person who created the IMAGE may have already provided a default COMMAND using the Dockerfile CMD. It's usually the most frequently performed action. The added benefit is that you can test all the commands that we will explore later from your shell, . Not understanding what is happening when I try to execute two commands at runtime via CMD directive in `Dockerfile. /bin/sh -c is the default entrypoint. Here’s an example command: Important Docker Commands List. CMD command is used to give the default commands when the image is instantiated, it doesn’t execute while build stage. py looks like the following: To confirm buildx is now installed run the help and the version command. yml. A container's main running process is the ENTRYPOINT and/or CMD at the end of the Put all of your commands in a wrapper script, complete with testing and  Apr 2, 2016 RUN executes command(s) in a new layer and creates a new image. Dockerfile is basically a text file that contains a set of instructions or commands aim at assembling a docker image. yml and docker-compose. It will take care of making them aware of each other and ensure they’re properly connected to each other. docker container stops running or goes into an exited state when pid 1 no longer exists. In a case of running a Docker container as a daemon (docker run -d …) it may be useful to know what appears on the console output of the running container. override. It will take care of making It’s often the first Docker command we learn. Apr 14, 2019 To execute multiple commands, begin your command line by setting a about the default entrypoint set in a container image, use the docker  May 8, 2017 cat Dockerfile FROM alpine ENTRYPOINT ls /usr $ docker build -t This means that our command ls -l is run inside of /bin/sh -c . It sets default When Docker runs a container, it runs an image inside it. I have a data. While some of you know what these means, where to use those and when to use those, there are some who might not know the exact difference between those commands. 0" Docker Hub / Registry — A public cloud-based registry service for developers to share their code on. I tried something like this in my docker-compose. already known long running process: docker run -d ubuntu /bin/sh -c "while true; do echo hello world; sleep 1; done" Docker ONBUILD command instruction is used to specify the commands that runs when the new docker image is used as a base image for another image (child image). ENTRYPOINT or CMD. There should be only one CMD per Dockerfile, you can list multiple but the Running multiple commands. You can specify an entry point with entrypoint . If your App's Image includes a CMD or ENTRYPOINT declaration, a single implicit This corresponds to Docker's behavior when you use docker run , so if you've If your App needs multiple Services, you can provide Enclave with a Procfile that service names to the commands the Containers for this service should run:. Docker build is the Docker engine command that consumes a Dockerfile and triggers the image creation process. ENTRYPOINT instruction allows you to configure a container that will run as an executable. This can be solved by single quoting your command as suggested by @cuonglm in the question comments. sh: ignoring /docker-entrypoint-initdb. The ENTRYPOINT of an image is similar to a COMMAND because it specifies what executable to run when the container starts, but it is (purposely) more difficult to override Keep in mind the “what executable to run” part! Many people trying to override the ENTRYPOINT at runtime, $ docker run [OPTIONS] IMAGE[:TAG] [COMMAND] [ARG] This command is optional because the person who created the IMAGE may have already provided a default COMMAND using the Dockerfile CMD. env file. 1 --uid=docker bash: --uid=docker: invalid option Docker Terminal Command Basics. Therefore, I put all my setting in the . 👍 (The only change I'd personally make is adding exec before the invocation of /docker-entrypoint. Docker has a default entrypoint which is /bin/sh -c but does not have a default command. E. This command is not applicable in all cases, especially if a docker container has been already started using /bin/bash command, e. Combining Docker and Pipeline allows a Jenkinsfile to use multiple types of technologies by combining the agent {} directive, with different stages. d/*" I'm probably doing something stupid, any help would be greatly appreciated. If you want to launch several processes in a docker container. accounts && service postgresql stop ENTRYPOINT ["/bin/bash"]  Dec 3, 2018 The docker command-line tool credentials are not sufficient to ENTRYPOINT specifies the entry point to use for your custom build step if the  Nov 19, 2015 This blog will explain how to attach shell to Docker container. If you’re stuck in that situation, here’s my goto debugging commands to help you get a bit more information on what’s up: docker logs <container_id>. If you need information about the default entrypoint set in a container image, use the docker image inspect command. The syntax is similar to Dockerfile 's ENTRYPOINT directive, where each shell token is a Starting multiple services from the same image. 04 ping 8. I meant to suggest that you can try either of the following options: docker run -ti --entrypoint=/bin/bash my/image -s docker run -ti --entrypoint=/bin/bash my/image -i For many Docker enthusiasts, the docker run command is a familiar one. Entrypoint ENTRYPOINT ["executable", "param1", "param2"] ENTRYPOINT command param1 param2 Configures a container that will run as an executable. Using Multiple Docker Compose Files. yml Incase you wanna run many commands at entrypoint. -rm — Remove container once it stops. As A frequent user of docker I can say , No need to give any extension to dockerfile just name it “Dockerfile” in your project directory . run processes multiple images entrypoint commands docker docker-image How is Docker different from a virtual machine? Should I use Vagrant or Docker for creating an isolated environment? Dockerfile is a text file or a script which contains Keywords and set of Linux commands which are executed automatically whenever we build the Docker Image. With Dockerfiles there are often multiple ways to accomplish the same thing. The Docker docs have a few suggestions for choosing between CMD and ENTRYPOINT for your initial container command: Favor ENTRYPOINT when you need to run the same command every time. Say I have the following Dockerfile: The ENTRYPOINT command makes it so that apache2 starts when the container starts. 02061ddf0a3d couchbase/server "/entrypoint. Updated on August 18th, 2017 in #docker Here's the same command except broken into multiple lines: RUN wget -O myfile. If you exec a script which itself exec's a command then the command will become the main process and everything will be fine, too. gz  May 1, 2019 Today, I will share four ways to run multiple Node. so the entry point must $ docker run -itP uwsgi_app:0. The script is invoked and given the argument postgres . It can be used multiple times in the one Dockerfile. Most of the time, this is the path to the service that should run in that container. Dockerfile s adhere to a specific format and use a specific set of instructions. sh script when the container is started, which does a whole bunch of stuff to start the server. Let's try both  May 1, 2016 Difference between RUN, CMD, ENTRYPOINT commands in docker and to install multiple system packages that are needed for your image. Creating a Dockerfile. by only the redis is start. If you have an entrypoint script, let's say entrpoint. The command is run via the entrypoint. cat Dockerfile #Download base image centos 7 FROM centos:7 CMD ping www. Once the build completes, you can issue the command docker images to see all of your newly created images (Figure A). Runtime arguments are passed in when you docker run or start your container: $ docker run [OPTIONS] IMAGE[:TAG|@DIGEST] [COMMAND] [ARG…] They allow you to send variables to your application that will be running in your container as defined in your dockerfile by your CMD or ENTRYPOINT definitions. d. Still, managing processes in bash scripts is simply no fun at all and prone to errors. the run. In the root of the solution, add docker-compose-build. It creates a new container, then starts it using a specified command. First is the “entrypoint” which are the ports that it listens on and you publish on all nodes in your swarm. 10 Answers. docker run <image-name>:<tag> <command>. In this article, we will get back to the basics and explore a few simple docker run examples. ) The reason is that a Docker container is meant to serve only one purpose, which usually means launching a single service. sh. This should not be confused with a . rosskevin commented Sep 11, 2015. Docker Client 3. [root@docker-host ~]# docker rmi 49f7960eb7e4 47fjay738290 987tr78rt5g5 Managing Multiple Microservices with Traefik in Docker Swarm. Metadata LABEL version="1. Dec 11, 2018 Typically, dockerfiles require a single entrypoint or single command. ENTRYPOINT exec top -b This will use shell processing to substitute shell variables, and will ignore any CMD or docker run command line arguments. 1 --uid=docker However uwsgi still complains with the same error, it seems the arg has not been appended. Dockerfile is also useful to tell the knowledge of what a job the container does to somebody else. CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES. The script needs to have executable permission ( chmod +x ). sh postgres'. Feb 12, 2016 Background When using Docker containers for a number of building those services using a single ENTRYPOINT command in the Dockerfile . $ docker buildx --help Usage: docker buildx COMMAND Build with BuildKit Management Commands: imagetools Commands to work on images in registry Commands: bake Build from a file build Start a build create Create a new builder instance inspect Inspect current builder instance ls List builder instances rm Remove a builder instance stop Stop builder instance use Set the current builder instance version Show buildx version Using multiple containers. Thois will 1) make the container slow to stop and 2) will prevent graceful exit: docker stop will send a SIGTERM, and if the container doesn't terminate in a timely manner (10 seconds) it will use a SIGKILL. CMD is a default command run after creating container without other command specified. , dev, staging, and production) or when you want to run admin tasks against a Compose application. 0 defines the tag (hence -t) of the image, which will be basically the name of the image. Description: docker run is probably the most important command on this Docker list. Also for program readability perspective, its good idea to split the long command into multiline command. docker entrypoint multiple commands