Docker run use current user. py with dependencies in requirements.
Docker run use current user 12. 2 TL;DR I personally prefer to use docker-compose to mount all host password related files to the … Nov 9, 2022 · By default, a Docker Container runs as a Root user. The followings example Oct 7, 2020 · I had cases where the container should be running with the same user and group ID as the docker-compose process, e. Sep 28, 2024 · Learn how to enhance Docker container security with the Dockerfile USER command. When building an image using the docker build command and a Dockerfile, the USER option can be used to specify the user that the image will run as. But if I write the command without sudo docker run hello-world it displays the following: docker: Got Nov 17, 2022 · When do we need to add -u $(id -u):$(id -g) in docker run command? I see that it is user id and group ip mapping but I want to understand this better. Understand its syntax, use cases, and benefits. If you do so, there are some quirks with local filesystem (bind) mounts that you should know about. Mar 6, 2023 · This script will basically add a new user called container when the Docker container is 1st run and use the user id passed into the container. Other commands, such as docker scout and docker build, may also require authentication to access subscription-only features or data related to your Docker organization. For example, running the Alpine Linux image with the command whoami will give us the root username, which is the default user according to the image Dockerfile: Jun 26, 2019 · How to run docker container as current user & group If you want to prevent your docker container creating files as root, use Dec 29, 2017 · And I am using docker run --security-opt label=user:newuser -i -t python-container:latest /bin/bash to run container from image. I understand that by default Docker volumes are mounted with root user ownership thus preventing its read-write access by the non-privileged user within the container. Find the recommended Docker Engine post-installation steps for Linux users, including how to run Docker as a non-root user and more. Among these complexities, user permission issues stand out as a common source of frustration for developers and system administrators alike. Is there any way to do this? Background info: this container will potentially modify files in the users home Nov 27, 2023 · The Problem: Docker writes files as root Sometimes, when we run builds in Docker containers, the build creates files in a folder that’s mounted into the container from the host (e. In this case we talk about user and group. For example it is not possible to mount a directory via fuse as a user without a name. Nov 16, 2020 · The problem is, since the current owner of those generated files are root, when modifying or saving changes to those files in a code editor results to permission denied. , user A runs this image will generate file belongs to A:A, and user B generate file belongs to B:B, while A and B are both users defined on host machine (i. Now is it possible t May 17, 2025 · Learn how to add users to the Docker group and use Docker without sudo. where the volume resides), without the need to add A and B into the image via Dockerfile? Aug 3, 2014 · When I'm running a windows docker container, I want that this container use the same host current user. The best way to prevent privilege-escalation attacks from within a container is to configure your container's applications to run as unprivileged users. By confirming your group membership and verifying with docker run hello-world, you’ll Oct 21, 2017 · But a simple change will allow you to run docker container as a regular user. Mar 20, 2025 · Now I have delete the complete directory and now I can run the “docker run hello-world” command as non root user. As you might guess, it allows you to specify the user that will be used when running the container. May 27, 2018 · I can view the list of running containers with docker ps or equivalently docker container ls (added in Docker 1. How ca Aug 27, 2021 · I need to run a cmd that will create my home folder within a docker container. Oct 7, 2024 · In this blog, I have explained detailed steps to run Docker containers as non-root user by creating a custom user in the Dockerfile. py with dependencies in requirements. Assuming I'm working on a Flask app at app. The test (docker run hello-world) work just fine from the non-admin account. To avoid this we have to set user You can pass using -e parameters with the docker run . I’ll use the following Docker Compose code part as an example: ```bash version: “3. Feb 24, 2018 · I installed Docker on my Ubuntu machine. I’ve used the --mount because it allows for specification of more options, specifically the uid and gid for the Sep 2, 2025 · We run Docker either as root user or with sudo permission every time. To prevent it from failing, don Sep 14, 2025 · Discover a step-by-step guide to easily add the current or desired user to the Docker group and reflect the change immediately. Nov 15, 2023 · In this comprehensive 2500+ word guide, you‘ll learn how to configure Docker to run without sudo on Linux. I need to produce a Docker image with Windows nano server 2019 but during the build process I need to run a program in the container with administrativ… Description Authenticate to a registry. Run the Docker daemon as a non-root user (Rootless mode) Jan 6, 2025 · This guide discusses why running Docker as a non-root user is vital, and explains the necessary steps to achieve this securely and effectively. ps1 file). However, as with any powerful tool, it comes with its own complexities. Likewise, this first user is the one that corresponds to the same ownership permissions as my home user. i. This is configured by the last USER line in the May 18, 2025 · I am trying to use podman to create a development container to compile a project (that requires a specific distro configuration). 23. This article delves into the intricacies of user permissions in Oct 4, 2022 · Updated on October 4, 2022 in #docker Running Docker Containers as a Non-root User with a Custom UID / GID If you're not using Docker Desktop and your UID / GID is not 1000 then you'll get permission errors with volumes. This step is crucial, as it lets you run Docker commands without needing to constantly switch to an admin account. Container identification Apr 6, 2025 · Docker — container user vs host user Overview Off late, there was a confusion at work regarding use of –user option in docker run command. Focus on gathering a comprehensive view of active users, their roles within projects, and how they interact with Docker resources. Question 1 Is that correct? Can The default user in a Dockerfile is the user of the parent image. 10. By default, containers run as the root user, but this practice is not recommended due to potential security risks. If you launched a container as the wrong user, delete it and recreate it with the correct docker run -u option. so that files created inside the container will start out with the right owner without any need for initial root permissions (which is not cool for security) or chown'ing files et Sep 3, 2019 · I know that one can use the --user option with Docker to run a container as a certain user, but in my case, my Docker image has a user inside it, let us call that user manager. Apr 10, 2025 · If your user doesn’t have access to this socket, Docker commands will fail with a permission denied error, even if Docker is correctly installed. May 28, 2024 · How do we specify that the owner of the mounted directory and all included files are owned by our “non-root user” within the container? I have tried to “docker run --user 1000:1000” to run the container, but all this does is run the container with the non-root user and the “/data/” mount is still using “root”. By using a non-root user, even if the attacker manages to break out of the application running in the container Mar 26, 2025 · Using the –user Option in docker run Command Another way to set the user in a Docker container from the host is by providing environment variables to the docker run command. You can run this command to see current ownership and permissions: Understanding User Permission Issues in Docker Docker has revolutionized the way we build, ship, and run applications. When to use the Docker run command Docker commands have revolutionized the business by utilizing containerization technology, most commonly used for enabling quicker Oct 11, 2024 · I have created a Docker volume and wish to mount it so that it is accessible by a non-root user in the container. command as mentioned here and as mentioned by errata. This means that when a container writes a file to a mounted directory, it is owned by the root Unix user, making it difficult for other users to modify or delete the files. ## The Reason Docker on Linux runs as a daemon. Video about this from [DockerCon 2019] Hardening Docker daemon with Rootless 237 Run this command from an administrator command window to add your user id to the docker-users group and log back into your user account for it to take effect. Now is also the entry of the sockets in the user directory remove: Dec 1, 2023 · To conclude, in this article we discussed how to use the USER instruction inside the Dockerfile to switch the Docker Container’s default user from Root to another user that we can create using the useradd and groupadd commands. It would be very helpful if docker run could provide a default, e. No more messing with elevated permissions, root, and anything that might open up your machine when you did not want to. e. You may also verify using the groups command to check the group membership of the current user. the source code directory). When I run sudo docker run hello-world it works. By default, Docker containers run as the root user, which can pose security risks if the container becomes compromised. However, whenever I restart the system, I have the permission denied again and I need to run chmod again. 09. 7 and the username is still printed with docker info. Using docker, the files created on the mounted volume have root:root Oct 22, 2014 · If we had only added one user in the above example, everything would have gone more smoothly. 04, Docker 18. This happens because, by default, containers run as the root user. With docker exec, use --user to specify which user account the interactive terminal will use (the container should be running and the user has to exist in the containerized system): Run docker with current user. Mar 26, 2025 · Docker containers are designed to be accessed as root users to execute commands that non-root users can’t execute. To run a container as a non-root user, you just need to create and add the USER instruction specifying the non-root user. Also, running as root can be an issue when sharing folders between the host and the docker docker run --detach: run container in background docker run --attach: attach to stdin, stdout, and stderr docker run --tty: allocate a pseudo-tty docker run --interactive: keep stdin open even if not attached For more information about re-attaching to a background container, see docker attach. So can I map the container-root or container-any-user to host-current-user? Fortunately Aug 23, 2017 · In my team we use Docker containers to locally run our website applications while we do development on them. groups The output shows docker, which indicates the current user is a member of it. Jun 5, 2021 · Something else I noticed: if I run the Docker Desktop GUI from the admin account and leave that running, the non-admin user can use docker. Understand security implications and implement best practices to keep your systems secure. 4, Docker-compose 1. We can run a command in a running container using the docker exec. Jan 27, 2022 · I ran sudo chmod 766 /var/run/docker. Mar 18, 2024 · To run a Docker container as a different user, we can use the –user option of the docker run command. I want that when I do whoami or echo %username% in the container, I get the same user then in Nov 5, 2020 · To avoid this, you need to make sure that you run the Docker Containers as non-root users. Oct 18, 2020 · A simple trick is to use a Docker run command with a user argument. Oct 30, 2022 · The command execution was successful and now we can run the hello-world docker successfully. . 03 (currently experimental) will be able to run rootless negating the problems that can occur using a root user. The mapped user is assigned a Aug 6, 2025 · Then log out and log back in again, just to be safe. I would like to know if I need to prepare my scripts for future versions of docker or if we are using totally different software. sh script would also work for an ENTRYPOINT for use in pipelines when not working with this interactive, so I am thinking I'll write this to handle both situations. Description I am using Docker version 1. If you do not explicitly set the user when starting the container, it will default to the user configured in the image, you can inspect the image to look this up. set the USER attribute according to the current login name (whoami). However, the possible downside of this approach is that your credentials will be displayed in the process listing, where you run it. User Namespace and Permission Model Docker uses a unique permission model that maps Understand permission requirements for Docker Desktop for Windows Docker is insecure by design, if a user can run docker command without admin rights (. Next create Dockerfile in the same directory: Mar 5, 2019 · I solved the issue by using a simple chmod 777 command. This guide explains how to run Docker as non-root user in Linux. 9” Find all the available commands you can use in a Dockerfile and learn how to use them, including COPY, ARG, ENTRYPOINT, and more. Jul 15, 2025 · When you run a Docker container and write files to the host system using volume mounts (-v), you might notice something annoying: the files are owned by root. This tutorial demonstrates how to run Docker container with specific user. 5 on Windows 10 via Hyper-V and want to use container executables as commands in the current path. Jan 28, 2025 · In this blog, we will learn how to run containers as a non-root user by configuring Dockerfiles, managing permissions, and addressing real-world application challenges. Apr 8, 2021 · Hello, I use Docker Desktop on Windows 10 with Windows containers. In this article, we will discuss two different ways using which you can create and add non-root users inside Docker Containers. Jun 24, 2023 · What is the Docker run command? The docker run command starts a new container, executes a command inside it, and pulls an image if needed. However, it doesn't display the user who launched each Docker container. Aug 5, 2018 · This quickly gets old when your project uses Composer, Webpack, Yarn, etc because your system becomes littered with root-owned files and directories. However, sometimes it can be useful to have your application inside a container run by a user with the same user and group ID as the host's user. txt, a Dec 8, 2017 · Is there a way to make docker container run as the CURRENT user on host machine, i. So, if my username in my linux box is josecz then I could use it from within a Dockerfile to run a cmd like: RUN mkdir Aug 26, 2021 · I still think its a matter of creating the user in the container, which I'm leaning towards doing with a script. I built a Docker image that is running fine, but I hav Lab 17: USER Instruction under Dockerfile Docker - Beginners | Intermediate | Advanced View on GitHub Join Slack Docker Cheatsheet Docker Compose Cheatsheet Follow us on Twitter Lab 17: USER Instruction under Dockerfile The USER directive is similar to WORKDIR, which changes the state of the environment and affects future layers. I was expecting that this would start the container and login into it with newuser@xxxxxxxx. To make it more secure, you may write your credentials in a configuration file and do docker run with --env-file as mentioned here. This is not the same with macOS. Then you can control A guide for managing roles, provisioning users, and optimizing Docker access with tools like SSO and activity logs. This means that if the Docker container is compromised, the attacker will have host-level root access to all the resources allocated to the container. You connect to the terminal as root user, but I would like to connect as a different user. I can easily resolved my issue by just chown command but would be tedious. Docker Permission Basics Understanding Docker Container Permissions Docker containers run with specific user and group permissions, which are crucial for system security and resource management. In the examples below, I am using Ubuntu 17. This poses a great security threat if you deploy your applications on a large scale inside Docker Containers. Let's use alpine/curl to download an image and save it to the current directory on your host Apr 7, 2019 · Set current host user for docker container Env: ubuntu 18. 04, but the commands should be the same for any Linux distribution. Authentication may be required for pulling and pushing images. Authentication credentials are stored Feb 29, 2024 · Hello to all, i am trying to find out the user details of the docker repository logged in currently in the powershell , new to docker , trying some thing in linux command “whoami” or systeminfo | grep -i “Username” similar kind of can some one please suggest. You can change or switch to a different user inside a Docker Container using the USER Instruction. So I always prefer using the long syntax in compose and the --mount option instead of -v with the docker run command so it doesn’t create the folder automatically, but In a Dockerfile, the `USER` instruction specifies the user account under which the container will run. If I run the command without using variables in a Powershell session, it works fine: Jan 18, 2020 · Introduction Oftentimes, applications insider docker containers are either run by root or some other user set up with some specific user and group ID. 1 day ago · Issue I have a weird problem when I use variables as arguments for a docker run command inside a Powershell script (. sock and it worked. This is one of the key Linux post-installation steps for the Docker engine. First I executed docker run command without the -c flag or the wget command etc sudo docker run --pid=host -dit --restart unless-stopped --privileged -v /home/:/home/ --net=host ubuntu:latest bash Once the container was running I entered this container as a root user using this command : sudo docker exec -it --user="root" bash Now once After creating a container in docker docker run -it -d --name my-container my-image I want to execute a command as specific user (according to docker exec) docker exec -it --user my-user my-conta Aug 22, 2025 · Learn how to add yourself to the docker-users group on Windows to run Docker without admin rights and optimize your workflow safely. You can use the Docker run command to create and execute containers based on Docker images. sudo usermod -aG docker username -aG docker: These are options for the usermod command: -a: This option appends the user to the supplementary group (s) specified without removing the user from other groups. When an ordinary user tries to clean those files up when preparing for the next build (for example by using Jul 9, 2025 · When I use docker to work with the shared workspace with host under Ubuntu, I find that files created by docker user is owned by root. This process can be supported by tools like device management software or manual Jan 27, 2018 · I am creating an app container that shall run under the permissions of the user who starts it. net localgroup docker-users "your-user-id" /ADD your-user-id is your local Windows user name. After making that change, it drops access from the root user to the modified uid/gid user and runs the original command/entrypoint. belongs to docker group) this basically means that this user can escape the container and become admin on the host. I‘ll explain in detail: The advantages of removing the sudo requirement for Docker How permissions work with the Docker daemon and docker group Step-by-step instructions to add users and verify sudo-less Docker Troubleshooting advice for permissions issues Security best practices when An image is kind of like a virtual machine, but much more light weight, using significantly less storage a memory (containers are usually megabytes in size). For this, you first need to create a user and a group inside the Container. Jul 2, 2019 · export UID export GID="$(id -g)" docker-compose up # OR skip exporting GID and do # GID="$(id -g)" docker-compose up UID is a shell variable and exporting it again by specifying a value as export UID=${UID} fails the command with "-bash: UID: readonly variable" and unfortunately it also creates an environment variable UID and sets UID shell variable value to it. Add user to docker group First of all, what happens if you try to run docker without sufficient privileges? You can see the output below: Mar 29, 2015 · I am using docker 20. GitHub Gist: instantly share code, notes, and snippets. You could accidentally use the wrong folder or run the command in the wrong context and create an empty folder somewhere you didn’t want. You can authenticate to any public or private registry for which you have credentials. Nov 2, 2023 · Overview: This guide demonstrates how to configure Docker so as to run it without the sudo command as a non-root user in Linux. Dec 27, 2018 · Both docker run and docker exec take a -u argument to indicate the user to run as. The official installation instructions recommend installing as root and selectively adding users to the docker group so they can run all Docker Jun 26, 2024 · Best practices Use a non-root user to limit root access As noted above, by default Docker containers will run as UID 0, or root. 13). -G docker: This specifies the group to which the user is being added, in this case $ docker network create mynet cb79f45948d87e389e12013fa4d969689ed2c3316985dd832a43aaec9a0fe394 $ docker run --name test --net mynet -d nginx:alpine Add a non-root user to a container Many Docker images use root as the default user, but there are cases where you may prefer to use a non-root user instead. Thank youl Sep 18, 2022 · I have a website that I'm trying to run inside Docker container. May 24, 2021 · I have this problem: a client’s DevOps is a Mac user, meaning that their Docker works differently on my Linux machine¹. May 14, 2022 · Although you could set a user ID and group ID as part of a Docker image, let’s see how it can be done from Docker Compose too. When I create a file using Docker (or, in my case, Docker Compose, the logic is the same in general), the file is created with root privileges, so I cannot directly edit them unless I chown them. Specifically: Jul 20, 2025 · Master Docker user management by learning how to create users, assign permissions, and implement security best practices in containers. Conclusion Docker permission errors after installation are common, especially when trying to run containers without sudo. Here's how to fix that. Sep 30, 2020 · To start a docker container with the current user I can call docker run with the --user parameter like 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. Is this possible? Jul 23, 2025 · Step 1: After installing the docker use the command to add the user to the docker group is as follows. Mar 2, 2016 · BY default when you run docker run -it [myimage] OR docker attach [mycontainer] you connect to the terminal as root user, but I would like to connect as a different user. For example, if your image is derived from an image that uses a non-root user example: swuser, then RUN commands in your Dockerfile will run as swuser. Mar 15, 2025 · Letting Docker create the source folder could be dangerous or at least problematic. The result is the image can be run unchanged on any developer machine. For containers whose processes must run as the root user within the container, you can re-map this user to a less-privileged user on the Docker host. Good news: the new Docker version 19. This can cause us pain, because those files will be owned by the root user. Same can also be specified in the Dockerfile with Jul 23, 2025 · If you're using Docker on Windows, you might need to add your user account to the docker-users group. Nov 6, 2017 · Setting the --user myname on the docker run command line is painful and easy to forget. This enhances security by reducing permissions and isolating processes, making your applications safer. I know this can be done by docker run -u`id -u`:`id -g` however, I would prefer not to put this chore onto the user but rather have it automatically applied as default for docker run. Mar 29, 2023 · Docker has become a popular platform for developers to create, deploy, and run applications in a portable, consistent environment. To avoid file permission errors, I change the ID of user www-data to match my user id on host. Identify your Docker users and accounts Before setting up roles and permissions, it's important to have a clear understanding of who in your organization requires Docker access. For some reason, Docker seems to be making any home directory owned by the first non-root user it encounters (even if that user is declared on an earlier image). For more information on Linux namespaces, see Linux namespaces. Aug 29, 2018 · The default user in docker exec is the same user used to start the container which can be set in docker run or your compose file. Besides, a run_as. Dec 12, 2016 · What is the difference between docker run parameters: -u, --user="" Sets the username or UID used and optionally the groupname or GID for the specified command. How can you achieve that ? The solution is to add a user flag to your command line when you start the container or in your docker compose. g. Maybe this is becuase docker is run by root user and the default user mapping mechanism is to map container-root to host-user or host-root. Fortunately, the fix is simple: ensure your user is added to the docker group and log out and back in for the change to take effect. This does not give sudo permissions to docker this adds your user to the docker group so that your user has access to docker without sudo. In this article, we are going to use the USER instruction Feb 20, 2018 · Running a Docker container as a non-root user The Problem: Docker writes files as root Sometimes, when we run builds in Docker containers, the build creates files in a folder that’s mounted into … Aug 3, 2022 · How do I run a docker container with a specific user. This setup worked for me, but after s Run as current user mode On Linux, by default, the Docker daemon runs as root, and so all containers run as root. fyoy mmtb cbkltdl bzocsbb adrusk mpwk hdui yndb voijgh qlx rzbclj jxmei mgcxdb gegbb wilxy