Docker run as user
Docker run as user. You put it “in front” of your different services, and nginx can route the traffic to the correct url. json failed: permission denied": unknown If I do. py. 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. Jun 1, 2020 · I have a Docker image which contains an analysis pipeline. Jun 26, 2024 · Learn how to use the USER instruction in a Dockerfile to set the user and group IDs for your containers. A container on the other side can run processes as root or a restriced user. Nov 17, 2022 · Brief docker background. 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. NOTE : Ensures that bash is the default shell. 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. To create the docker group and add your user: Create the docker group. Apr 25, 2024 · This tutorial assumes you already have Docker installed and your user has permission to run docker. Apr 27, 2015 · the docker run command has the -u parameter to allow you to specify a different user. 3 WORKDIR /opt/app COPY package. Nov 5, 2020 · Use the Docker Run command to run 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. Nov 17, 2020 · In lot of instructions how to run docker on Ubuntu 20. When I start Docker Desktop with “run as administrator” it starts up fine. There is additional detailed information about docker run in the Docker run reference. 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. Find useful tips and solutions from other Docker users. 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. Method 1 – Add user to Docker group. Both Docker Desktop as my Windows 10 are fully up-to-date (Windows 10 20H2). 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. Note. sudo docker exec -it --user root oracle18se /bin/bash I get. 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 . 0 4448 692 ? For example, if the web service configuration is started with bash, then docker compose run web python app. Learn how to install and use Docker daemon and containers without root privileges using rootless mode. Running as the User. If they don't (as I would expect in general), the workarounds would not be generally safe either. How can you achieve that ? The solution for docker run as user command line For docker run as user command. Feb 6, 2024 · The docker run command uses the –user option to set the user’s UID and GID in the container. OCI runtime exec failed: exec failed: container_linux. 16-1 . For information on connecting a container to a network, see the “Docker network overview”. May 26, 2023 · sudo Access. Aug 3, 2014 · Learn how to run a windows docker container with the current host user from this question and answer page. 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. 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. 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. 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. I am using Docker in combination with WSL2. If however you do: RUN whoami USER test RUN whoami You should see root then test. 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). But this user should be able to use sudo inside the container. . By giving sudo access to any user we can control what all commands a user can run in the privileged mode. RUN npm install COPY . See "man sudo_root" for details. sudo is an acronym for Super User Do. 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. The -d option (shorthand for --detach) sets the container to run in the background, in detached mode, with a pseudo-TTY attached (-t). 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. Dec 17, 2019 · sudo docker exec -it -u 0 oracle18se /bin/bash or . Mar 18, 2024 · To run a Docker container as a different user, we can use the –user option of the docker run command. yml. As of 0. For example it is not possible to mount a directory via fuse as a user without a name. The second difference is that the docker compose run command does not create any of the ports specified in the service configuration. Additionally, appending attributes to the command's basic syntax allows the user to customize container storage, networking, performance, and other settings. 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. EXPOSE 3000 USER node CMD ["node", "server. ) $ 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 this is your case and don't want to run docker command with root user, follow this link. Most images that haven't been hardened will default to running as root no matter the user that starts 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. 04 server and it worked just fine! Docker is insecure by design, if a user can run docker command without admin rights (. 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. Using a custom-defined name provides the benefit of having an easy-to-remember ID for a container. That is why the accepted answer adds a new user in the Dockerfile. 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. Docker starts containers as a root user. 0, you can specify that a group other than docker should own the Unix socket with the -G option. Mar 5, 2019 · 1- Execute docker command with non-root user. 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. 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. 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. override. 1 0. To run the docker command without sudo, add the user to the docker group as follows. g. Hence, the normal users can't perform most Docker commands. To run this pipeline, I need to provide input data and I want to keep the outputs. Any processes running as that user inherit those permissions. (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. 04 /bin/bash NOTE: The -u parameter is the equivalent of the USER instruction for Dockerfile. The docker run command lets you create and execute OCI-compatible containers using container images. 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. 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. May 27, 2018 · But this doesn't tell you who ran the docker command that started the container. $ Dec 12, 2016 · docker run --user=demo_user <image_name> <command> runs a container with the given command as demo_user. sudo -u test whoami But it seems better to use the official supported instruction. 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. See how to avoid security risks, manage permissions, and switch between users with UID/GID or username/groupname. 2. Dec 29, 2017 · You can use docker run option --user. 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. If you want to run Docker as non-root user in Linux, you need to do the following steps. This prevents port collisions with already-open ports. $ 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. Per default, nginx runs as root user. 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. 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. 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. example ) to version control and instruct the user to copy-paste it to the correct path (which will be added to . 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. What is the Docker security risk of /var/run/docker. 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. The image reference is the name and version of the image. I tested this on Ubuntu 18. No idea how exactly it can be done on Windows but it "just works" on Linux. To run Docker without root privileges, see Run the Docker daemon as a non-root user (Rootless mode). There's no magic solution here: permissions inside docker are managed the same as permissions without docker. The -d flag makes the Docker CLI detach from the container, allowing it to run in the background. docker ps docker ps gives you a container ID. 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. 16-1 Note the user is still not set, we need to tell Docker to use this new user. 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. 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. We're using a few extra flags with docker run here. Alternatively you can run a command as a different user with sudo with something like. Why? Only root processes can listen to ports below 1024 Sep 15, 2014 · Normally, docker containers are run using the user root. – 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. 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. To create a Docker group, you can use the following command. Modifying the Dockerfile This creates and starts a container named mycontainer from an alpine image with an sh shell as its main process. env file values. A list of all docker container run options can be found on the Docker documentation page. docker attach [mycontainer] You connect to the terminal as root user, but I would like to connect as a different user. js"] So, all the files added during image build are owned by root, but node server. Mar 2, 2016 · Simply add the option --user <user> to change to another user when you start the docker container. Find out the prerequisites, limitations, and features of this security option. 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 overrides it with python app. For details on how this impacts security in your system, see Docker Daemon Attack Surface. 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. Aug 11, 2020 · Unless rootless docker is used, the docker engine is always running as root user. 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. We're going to use it to specify the user ID (UID) and group ID (GID) that Docker should use. Follow the steps to define and set build ARGs, docker-compose variables and . I'd like to use a different user, which is no problem using docker's USER directive. 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. 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. 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. 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. i. e. First, create the docker group. To run Docker as a non-root user, you have to add your user to the docker group. 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>". Let’s try it. 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. 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. gitignore ). 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. Users are encouraged to use the new command syntax. Lets inspect the image we just created: docker image inspect user/nginx:1. That’s useful for micro-services, for example. docker run -it [myimage] OR. Jan 27, 2022 · Stack Exchange Network. You need to run the appropriate chown and chmod commands to change the permissions of the directory. 13 syntax is still supported. 9. 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. This process involves adding user creation steps in your Dockerfile and adjusting the file permissions accordingly. Nov 21, 2017 · $ docker build -t so-test . 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. Aug 8, 2024 · Setting Up a Non-Root User in Docker Creating a Non-Root User. 1. Under the hood, docker run command is an alias to docker container run. create a docker group and add your current user to it. 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. The root user has almost full privileged access to the state of the container. json . 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. Method 2: By adding a user to the Docker group. @justin is saying that creating a new docker user is best practices in any case . 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. belongs to docker group) this basically means that this user can escape the container and become admin on the host. Jul 11, 2024 · Introduction. sock? Sep 30, 2020 · To start a docker container with the current user I can call docker run with the --user parameter like. Image references. 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). If you need to run docker as the root user, please remember to prepend sudo to the commands in this tutorial. go:345: starting container process caused "chdir to cwd (\"/home/oracle\") set in config. 10. The docker run command can be used in combination with docker commit to change the command that a container runs. To run a Docker container as a non-root user, you need to create a user with limited privileges inside the container. fmjda ssidw lmjdox trecg tqc mlyaogn wdxr tounx roq qrjzx