Docker run as user. For docker attach or docker exec: Since the command is used to attach/execute into the existing process, therefore it uses the current user there directly. To run Docker as a non-root user, you have to add your user to the docker group. In my usual workflow, switching a user should rebuild the image because I want to verify that the build process works for any user that should install/run the image. Make sure the uid/gid of the user that executes the main process inside the container matches the owner of the folder you map into the container as volume. Modifying the Dockerfile This creates and starts a container named mycontainer from an alpine image with an sh shell as its main process. Follow the steps to define and set build ARGs, docker-compose variables and . Docker starts containers as a root user. Aug 3, 2014 · Learn how to run a windows docker container with the current host user from this question and answer page. 0 4448 692 ? For example, if the web service configuration is started with bash, then docker compose run web python app. Mar 18, 2024 · To run a Docker container as a different user, we can use the –user option of the docker run command. The root user has almost full privileged access to the state of the container. get the ID of the desired user and or group you want the permissions to match with executing the id command on your host system - this will show you the uid and gid of your current user and as well all IDs from all groups the user is in. yml. js is run as the node RUN npm install -only=production # Create a user group 'xyzgroup' RUN addgroup -S xyzgroup # Create a user 'appuser' under 'xyzgroup' RUN adduser -S -D -h /usr/app/src appuser xyzgroup # Chown all the files to the app user. Without knowing your directory structure, I guess your problem is, that your user 1001 (or the setup programm which is run with 1001's permission) tries to access directories that (probably) are owned by root. May 24, 2021 · $ docker-compose run app id Creating docker-user-demo_app_run … done uid=1001 gid=1001 We can add an example file (like docker-compose. docker run --user=demo_user:group1 <image_name> <command> runs a container with the given command as demo_user whose primary group is set to group1. py. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Create a docker group if there isn’t one: Now build the image (you can replace user with your own docker hub user id, but it shouldn’t matter for this exercise): docker build -t user/nginx:1. g. The image reference is the name and version of the image. $ docker run --rm -it so-test bash I am root uid=0(root) gid=0(root) groups=0(root) exemple@37b01e316a95:~$ id uid=1000(exemple) gid=1000(exemple) groups=1000(exemple) It's just a simple example, you can also use the su -c option to run command with changing user. Mar 5, 2019 · 1- Execute docker command with non-root user. Most images that haven't been hardened will default to running as root no matter the user that starts the container. I tested this on Ubuntu 18. Apr 25, 2024 · This tutorial assumes you already have Docker installed and your user has permission to run docker. Nov 21, 2017 · $ docker build -t so-test . (For example, examine the step before a RUN step to see what the filesystem looks like before it executes, or after to see its results. sudo docker exec -it oracle18se /bin/bash May 29, 2024 · $ docker exec -it baeldung bash To run a command as administrator (user "root"), use "sudo <command>". Feb 6, 2024 · The docker run command uses the –user option to set the user’s UID and GID in the container. 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-cont Sep 20, 2018 · As we can see here, the id of the first user in an alpine image is 1000, different from the uid 999 of an ubuntu image. Aug 11, 2020 · Unless rootless docker is used, the docker engine is always running as root user. create a docker group and add your current user to it. docker run -it [myimage] OR. Under the hood, docker run command is an alias to docker container run. This process involves adding user creation steps in your Dockerfile and adjusting the file permissions accordingly. First, create the docker group. Nov 17, 2022 · Brief docker background. Both Docker Desktop as my Windows 10 are fully up-to-date (Windows 10 20H2). The user needs to run the commands with the sudo prefix, if he/she wants to run as superuser, like the following:- # At the end, set the user to use when running this image USER node My simplified Dockerfile currently looks like this: FROM node:6. The docker daemon must always run as the root user, but if you run the docker client as a user in the docker group then you don't need to add sudo to all the client commands. User bob with access to docker can run a container as any uid (this is the docker run -u 1234 some-image option to run as uid 1234). Nov 16, 2020 · Mounting the host's passwd/group is a nice trick (+1), but it has the drawback that it involves declaring a bunch of non-existent users and groups within the container, as well as a home directory path that (probably) doesn't even exist within the container: cd ~ → bash: cd: /home/will: No such file or directory. Learn how to install and use Docker daemon and containers without root privileges using rootless mode. Dec 8, 2017 · The problem is that file generated by docker belongs to root:root, which is very annoying because I do not want to run my script via sudo. Note. e. docker attach [mycontainer] You connect to the terminal as root user, but I would like to connect as a different user. docker ps docker ps gives you a container ID. 2. Jun 1, 2020 · I have a Docker image which contains an analysis pipeline. Let’s run the whoami command to find out the user name of the logged-in user: Jun 6, 2020 · docker container run [OPTIONS] IMAGE [COMMAND] [ARG] The old, pre 1. OCI runtime exec failed: exec failed: container_linux. . For more information on using Docker without sudo access, please see the Executing the Docker Command Without Sudo section of our How To Apr 10, 2020 · Since that Unix socket is owned by the root user, the Docker daemon will only run as the root user. In your case, and assuming you have a user named foo in your docker image, you could run: sudo docker run -i -t -u foo ubuntu:14. To run Docker without root privileges, see Run the Docker daemon as a non-root user (Rootless mode). We're using a few extra flags with docker run here. If default shell is /bin/sh you can do like: RUN ln -sf /bin/bash /bin/sh RUN useradd -ms /bin/bash vault Sep 1, 2020 · In Docker, all folders are owned by root. Dec 29, 2017 · You can use docker run option --user. When do we need user and group? It follows that if there’s a bug in one of those processes, it might damage the container. Users are encouraged to use the new command syntax. Apr 24, 2018 · The USER instruction sets the user name or UID to use when running the image and for any RUN, CMD and ENTRYPOINT instructions that follow it in the Dockerfile. Method 2: By adding a user to the Docker group. For information on connecting a container to a network, see the “Docker network overview”. To create the docker group and add your user: Create the docker group. You can use it or just the 2/3 first characters to go into your container using: docker exec -it container_id /bin/bash Nov 2, 2023 · Add User to Docker Group. env file values. As of 0. That’s useful for micro-services, for example. Using a custom-defined name provides the benefit of having an easy-to-remember ID for a container. gitignore ). sudo is an acronym for Super User Do. See "man sudo_root" for details. You need to run the appropriate chown and chmod commands to change the permissions of the directory. If you need to run docker as the root user, please remember to prepend sudo to the commands in this tutorial. Alternatively you can run a command as a different user with sudo with something like. Additionally, appending attributes to the command's basic syntax allows the user to customize container storage, networking, performance, and other settings. Aug 5, 2021 · @KarlKnechtel If I understand correctly, the RUN pip command in the Dockerfile is run by the container's root user by default, regardless of which host system user invoked docker build . Jan 27, 2022 · Stack Exchange Network. Method 1 – Add user to Docker group. Nov 5, 2020 · Use the Docker Run command to run the container. This pipeline must be able to be run by other users than The output would be root on both (unless of course you run USER beforehand). 04 server and it worked just fine! Docker is insecure by design, if a user can run docker command without admin rights (. i. To run this pipeline, I need to provide input data and I want to keep the outputs. That is why the accepted answer adds a new user in the Dockerfile. I'd like to use a different user, which is no problem using docker's USER directive. Mar 29, 2023 · Also, login into a Linux shell using one user and running the docker as another user (using the --user) is something I'm trying to avoid. $ Dec 12, 2016 · docker run --user=demo_user <image_name> <command> runs a container with the given command as demo_user. To run the docker command without sudo, add the user to the docker group as follows. 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: $ docker run --rm alpine:latest whoami root The docker group grants root-level privileges to the user. Hence, the normal users can't perform most Docker commands. But this user should be able to use sudo inside the container. 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. Dec 17, 2019 · sudo docker exec -it -u 0 oracle18se /bin/bash or . 0, you can specify that a group other than docker should own the Unix socket with the -G option. Apr 27, 2015 · the docker run command has the -u parameter to allow you to specify a different user. A list of all docker container run options can be found on the Docker documentation page. – abhishek thakur Commented Dec 5, 2018 at 5:12 Mar 23, 2020 · docker-compose run -u root <service> bash If you're in the process of debugging your image build, note that each build step produces an image, and you can run a debugging shell on that image. For example it is not possible to mount a directory via fuse as a user without a name. go:345: starting container process caused "chdir to cwd (\"/home/oracle\") set in config. @justin is saying that creating a new docker user is best practices in any case . RUN npm install COPY . When I start Docker Desktop with “run as administrator” it starts up fine. Run the Container in the Nov 7, 2016 · To achieve the desired behavior without changing owner / permissions on the host system, do the following steps. What is the Docker security risk of /var/run/docker. sock? Sep 30, 2020 · To start a docker container with the current user I can call docker run with the --user parameter like. A container on the other side can run processes as root or a restriced user. For details on how this impacts security in your system, see Docker Daemon Attack Surface. The docker run command can be used in combination with docker commit to change the command that a container runs. The -d option (shorthand for --detach) sets the container to run in the background, in detached mode, with a pseudo-TTY attached (-t). But then I (ofcourse) don’t have access to my own WSL2 distribution because that 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--user $(id -u): $(id -g) as an If you run this image with docker run -it --rm -p 80:80 --name test apache, you can then examine the container's processes with docker exec, or docker top, and then ask the script to stop Apache: $ docker exec -it test ps aux USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 1 0. To create a Docker group, you can use the following command. In the command line, you need to run docker run: 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. The second difference is that the docker compose run command does not create any of the ports specified in the service configuration. Let’s try it. If they don't (as I would expect in general), the workarounds would not be generally safe either. A docker run command takes the following form: $ docker run [OPTIONS] IMAGE[:TAG|@DIGEST] [COMMAND] [ARG] The docker run command must specify an image reference to create the container from. 16-1 . 16-1 Note the user is still not set, we need to tell Docker to use this new user. js"] So, all the files added during image build are owned by root, but node server. NOTE : Ensures that bash is the default shell. This prevents port collisions with already-open ports. 04 /bin/bash NOTE: The -u parameter is the equivalent of the USER instruction for Dockerfile. sudo docker exec -it --user root oracle18se /bin/bash I get. I am using Docker in combination with WSL2. Per default, nginx runs as root user. Oct 4, 2022 · Learn how to fix permission errors with volumes when using Docker containers as a non-root user with a custom UID / GID. May 26, 2023 · sudo Access. Image references. If this is your case and don't want to run docker command with root user, follow this link. Jun 26, 2024 · Learn how to use the USER instruction in a Dockerfile to set the user and group IDs for your containers. The –workdir option sets the working directory to the user’s home directory, while the –volume option mounts necessary files from the host to the container. There is a side effect when using this flag: user remapping will not be enabled for that container but, because the read-only (image) layers are shared between containers Jan 26, 2021 · While we can run containers as root and have its process execute as a non-root user on the host (which is good), there are still a few downsides. sudo groupadd docker This is another major concern from the security perspective because hackers can gain root access to the Docker host by hacking the application running inside the container. For example, it requires root access in the first place, parts of the container (such as conmon) are still running as root and a vulnerability somewhere in the stack might render the user protection useless. json . 1. If we add a user in an alpine image and run a process with this user (using the USER instruction in the Dockerfile, for instance), we will see the uid 1000 as the owner of the process. If you want to run Docker as non-root user in Linux, you need to do the following steps. We're going to use it to specify the user ID (UID) and group ID (GID) that Docker should use. By giving sudo access to any user we can control what all commands a user can run in the privileged mode. The -d flag makes the Docker CLI detach from the container, allowing it to run in the background. Jul 31, 2020 · The documentation for docker run --user is short, I wil paraphrase documentation for Dockerfile USER command: root (id = 0) is the default user within a container Aug 3, 2022 · BY default when you run. It can be used to specify either an UID without a name: docker run --user 1000 Or specify UID and GID without a name: docker run --user 1000:100 or specify a name only without knowing which UID the user will get: docker run --user newuser Feb 20, 2018 · Fortunately, docker run gives us a way to do this: the --user parameter. override. sudo docker run -it nonroot-demo bash You can see that the user has been changed to the non-root user that we created in the Dockerfile. How can you achieve that ? The solution for docker run as user command line For docker run as user command. There is additional detailed information about docker run in the Docker run reference. 1 0. py overrides it with python app. Aug 8, 2024 · Setting Up a Non-Root User in Docker Creating a Non-Root User. Find useful tips and solutions from other Docker users. May 27, 2018 · But this doesn't tell you who ran the docker command that started the container. This does exactly what we want, but of course there is a catch: the container user is no longer root, or whatever the author decided to use. Aug 23, 2017 · The suggested trick assumes that the numeric user IDs (both those used by the image and the one used to run the image) agree with those in the host /etc/passwd. 10. 13 syntax is still supported. The docker run command lets you create and execute OCI-compatible containers using container images. In Debian and Ubuntu as Feb 16, 2021 · I’ve been using Docker for a while now and since the last 2 months that Docker Desktop doesn’t start anymore. sudo -u test whoami But it seems better to use the official supported instruction. EXPOSE 3000 USER node CMD ["node", "server. belongs to docker group) this basically means that this user can escape the container and become admin on the host. json failed: permission denied": unknown If I do. Why? Only root processes can listen to ports below 1024 Sep 15, 2014 · Normally, docker containers are run using the user root. No idea how exactly it can be done on Windows but it "just works" on Linux. Running as the User. To run a Docker container as a non-root user, you need to create a user with limited privileges inside the container. Jul 11, 2024 · Introduction. Any processes running as that user inherit those permissions. Nov 17, 2020 · In lot of instructions how to run docker on Ubuntu 20. Lets inspect the image we just created: docker image inspect user/nginx:1. ) $ docker build Jan 6, 2020 · How to run nginx as non-privileged user with Docker nginx is an open-source solution for web serving and reverse proxying your web application. If however you do: RUN whoami USER test RUN whoami You should see root then test. 04 (same applies to Linux Mint Ulyana) you may find that after installing docker you have to add your user to docker group by the following command: To disable user namespaces for a specific container, add the --userns=host flag to the docker container create, docker container run, or docker container exec command. Portainer is a Universal Container Management System for Kubernetes, Docker/Swarm, and Nomad that simplifies container operations, so you can deliver software to more places, faster. Find out the prerequisites, limitations, and features of this security option. See how to avoid security risks, manage permissions, and switch between users with UID/GID or username/groupname. docker run --user=demo_user:group1 --group-add group2 <image_name> <command> runs a Aug 5, 2018 · In my system, my user jtreminio has user ID 1000 and group ID 1000, so the new line-u $(id -u ${USER}):$(id -g ${USER}) gets interpreted as-u 1000:1000. I searched for solutions to make docker container run as non-root, but the method I found need to change Dockerfile and add user to the image, e. Mar 2, 2016 · Simply add the option --user <user> to change to another user when you start the docker container. There's no magic solution here: permissions inside docker are managed the same as permissions without docker. RUN chown -R appuser:xyzgroup /usr/app # Switch to 'appuser' USER appuser # Open the mapped port EXPOSE 3000 # Start the Jun 26, 2017 · If we run those two command separately (COPY <host_path> <source_path>; chown other_user:other_user) then it created one extra layer which eventually doubles the image size. If you don't specify a custom name using the --name flag, the daemon assigns a randomly generated name, such as vibrant_cannon, to the container. example ) to version control and instruct the user to copy-paste it to the correct path (which will be added to . You put it “in front” of your different services, and nginx can route the traffic to the correct url. Aug 31, 2024 · Once you've created your image, you can start a container using docker run: docker run -d -p 8080:80 my-website:v1. 3 WORKDIR /opt/app COPY package. 9. xbdzn umgpq zdjfpmos vpbg uqxhc gtqeir jku aemo xlhxc qtiljt