Docker uses bash not sh

Docker uses bash not sh. You also need to ensure that your entrypoint. However, these images often lack the widely-used bash shell, leaving you with the default sh or ash. . May 5, 2019 · I use a Docker container for my development environment and set the shell to bash in my Dockerfile: # … ENTRYPOINT ["bash"] Yet when VS Code was connecting to my container it was insisting on using the /bin/ash shell which was driving me crazy However the fix (at least for me) was very simple but not obvious: From the . RUN uses /bin/sh by default. g. sh / RUN chmod +x /script. Above example will help you out. sh file from current directory. In this case, Docker will execute the CMD with a system Mar 18, 2024 · Here, we’ll log in to the container with a basic command line interpreter (/bin/sh). E. /env. []. To easily get a debug shell into any container, use docker debug. sh script. Jan 15, 2015 · I'm using Docker on MacOSX (with Boot2Docker). docker run -it <container_name> <image_name> /bin/bash and get an interactive bash shell. sh is executable, docker will copy the permissions exactly as they are on your build host, so this step may not be needed depending on your scenario. FROM <parent image>. When I try to build the image it successfully references the . It can also be used with flags, such as docker run -it ubuntu bash . bash_profile only for login sessions. sh file but after running “echo Hello docker” it does nothing and image building goes on. Jun 10, 2022 · CMD bash CMD ["/bin/sh", "-c", "bash"] There would not be an equivalent docker exec command. sh #!/bin/bash exit 0; Then build it with docker build --tag nginx-healthcheck-broken . Using sudo inside the docker fails because sudo is not installed, there is no need to use sudo inside the docker because all of the commands inside the docker run as user root. Cmd' null [ "/bin/bash" ] Here we see the ENTRYPOINT is null and the CMD is ["/bin/bash"]. other commands in the line do not run without -c; sh python would not run, it requires sh -c python. Run the image with arguments abc or xyz or something else. I have to stop by CTRL-C Kindly advise as to what I am doing wrong as my image does not get totally build service apache2 start curl localhost echo Hello Nowadays, Alpine images will boot directly into /bin/sh by default, without having to specify a shell to execute: $ sudo docker run -it --rm alpine / # echo $0 /bin/sh This is since the alpine image Dockerfiles now contain a CMD command, that specifies the shell to execute when the container starts: CMD ["/bin/sh"]. it can be only used by chmod command(i replaced chmod command before semicolon with echo and got "permission denied". bash_profile from . You also must set executable permission for start. Basically I run following command docker run -d -P --volumes-from=ol7-pgdata --name pgdb1 -h pgdb1 -e DBNAME=PGDB1 -e OPNAME=deploy postgres/pgaas This container should start a script /tmp/run_pgaas. bash_profile file (what ever you prefer). sh) #!/bin/bash trap "echo SIGINT; exit" SIGINT trap "echo SIGTERM; exit" SIGTERM echo Starting script sleep 100000 I then run the following commands: $ docker build . sh"] Aug 28, 2023 · This example copies the entrypoint. sh, by running chmod +x start. So CMD executable May 26, 2018 · Now available on Stack Overflow for Teams! AI features where you work: search, IDE, and chat. Is there some way to tell RUN to use /bin/bash instead? Aug 24, 2022 · RUN /Script. sh script into the container and uses the RUN chmod +x instruction to make it executable. Mar 2, 2016 · For docker run: Simply add the option --user <user> to change to another user when you start the docker container. The it flags open an interactive tty. # make /bin/sh symlink to bash instead of dash: RUN echo "dash dash/sh boolean false" | debconf-set-selections. i use linux but also bsd, and i won't install bash unless i need it. Jul 31, 2017 · You should rather use docker logs containerid to see the output of your code. com, and installing the Docker desktop application for your specific operating system. Docker Debug is a replacement for debugging with docker exec. Only ENV entries in the Dockerfile (and docker options like --rcfile can change the environment). Mar 15, 2024 · In this article, we'll learn how to run an app inside of a container with Docker. To execute the script directly use the exec array form instead: RUN ["/Script. sh instead of letting the shebang invoke Bash automatically). Entrypoint,. Avoid Hard-Coding Values in ENTRYPOINT Mar 19, 2024 · If we try to start a new operating system container, for example, an 18. Simply use the -l or --login option to force the shell opened in the Docker image to be a login variant, which will source /etc/profile and the first of the files ~/. sh is the shell form of the RUN instruction, which will execute /bin/sh -c <command>. If your script is being run by the sh shell, but you want bash, the proper solution is either to have the sh process invoke bash as a one-off, e. bash_profile, ~/. sh >> ~/. 04 Ubuntu, we’ll see that it doesn’t stay alive: $ docker run ubuntu:18. Without more information from you there are at least two possibilities: docker-compose simply isn't installed at all, and you need to install it. 3 COPY . RUN . RUN DEBIAN_FRONTEND=noninteractive dpkg-reconfigure dash. Install bash $ RUN apk add --update bash Use #!/bin/sh in script instead of #!/bin/bash. I'd like to incorporate these settings (like ROS_PATH) into the environment of the container. If you would like to use bash in your Alpine-based Docker containers, this guide will show you how to install and use it. I'm trying to connect to a running container or start a new container in interactive mode with the bash shell -- not the sh shell. Apr 25, 2024 · If your container image includes a more advanced shell such as bash, you could replace sh with bash above. 9. sh HealthCheckTest. It then defines the ENTRYPOINT to use the entrypoint. bash -c 'source /script. docker exec -it --user root mycontainername bash or sh I just downloaded this official docker hub's 1. 12未満)/… Jul 14, 2022 · We can use that environment to run compiled Linux applications and create custom executables. 32. docker run -P mylocalimage bin/a3-write-back or I get: docker "env: can't execute 'bash': No such file or directory" Aug 22, 2019 · When using the exec form and executing a shell directly, as in the case for the shell form, it is the shell that is doing the environment variable expansion, not docker. Config. If you have to, you can arguably use them even in production (which defeats the purpose of increased security - such as hiding environment variables and protecting scripted apps code). sh ENTRYPOINT ["/script. sh"] Sep 25, 2009 · It might be configured to run /bin/sh rather than /bin/bash. May 8, 2016 · docker exec -it yiialkalmi_postgres_1 psql -U project -W project Some explanation. In particular, it does not use the ENTRYPOINT or CMD from the image at all. sh whose contents are as below. /script. Plus, you can bring along your favorite debugging tools in its customizable toolbox. sh RUN source /env. I created a docker image from openjdk:8-jdk-alpine and I want to use bash, rather than sh as my shell, however when I try to execute simple commands I get the following errors: RUN bash. I had to log into the docker container as a root user to install vim. So create a script /bin/bash^M that will dos2unix the arguments they get and run them with "$@". This can be useful for tasks such as running automated tests, deploying applications, or debugging problems. I want to run: docker exec -it <container_name> /bin/bash or. Bash itself is installed at /usr/local/bin/bash, not /bin/bash, so the recommended shebang is #!/usr/bin/env bash, not #!/bin/bash (or explicitly running your script via bash //script. sh #!/bin/bash echo $1 Build the image using the existing Dockerfile: docker build -t test . Jul 25, 2021 · start. docker exec -it <container_id> /bin/bash Dec 26, 2023 · A: Docker run bash script is a command that allows you to run a Bash script inside a Docker container. Learn more Explore Teams Jun 16, 2023 · I have dockerfile wherein I have referenced start. sh). So… when is it sh and when bash? The image I’m providing supports both and I want it to be bash, not sh, however I can’t find a way to make the gitlab runner to use bash. Apr 3, 2021 · docker run -it --rm --entrypoint /bin/bash vulnerables/web-dvwa OR if you want a shell on the running mysqld container, you can run it normally w/ out -it argument and then do the following to get a bash shell in the running container. If you want to have an interactive terminal, you want to use docker exec -ti ${container name or id} sh. docker exec containerId bash means you want to get to a bash process inside the container. You can also use a linter like ShellCheck to check the syntax and style of the scripts to ensure proper formatting. Dec 6, 2023 · The 'docker run bash' command is used to start a new Docker container and run a Bash shell inside it. sh in root /, which does not exist. sh run start. Basically it will cause to attach to the terminal. The comment from @java25 did the trick in my case. sh"] . So use an absolute path to the script you want to execute: Apr 15, 2017 · Here is a very simple Dockerfile with instructions as comments launch it to spin up a running container you can exec login to. Then, in your Dockerfile, copy your bash file to your image, and use the ENTRYPOINT instruction for running the file when container is being created: COPY script. Or, like @Maroun's answer in comment, you can change your CMD to execute your bash script. Soham accomplished this by: Creating a BusyBox container using the Docker CLI to run common commands. # Dockerfile. 27s user 0m 0. May 25, 2023 · The documentation states By default the Docker executor doesn’t override the ENTRYPOINT of a Docker image and passes sh or bash as COMMAND to start a container that runs the job script. so, i limit my shell scripting to the posix-level bourne shell, which is fairly modern, having functions and local May 11, 2015 · There is a bunch of modern docker-images that are based on distroless base images (they don't have /bin/bash either /bin/sh) so it becomes impossible to docker exec -it {container-name} bash into them. May 3, 2021 · /bin/sh is almost always available in containers, except when no shell can be found in that container. /gradlew build. Dec 26, 2019 · When your Dockerfile runs RUN . If you need to run a command inside a running Docker container, but don’t need any interactivity, use the docker exec command without any flags: Oct 25, 2021 · <<But new scripters need not limit themselves to sh-compatible scripts unless they are shooting for some backward compatibility>> backward presumes one dimension in which linux is the only thing still growing. sh to run the start. If you wanted to open the bash terminal you can do this; docker exec -it yiialkalmi_postgres_1 bash May 8, 2018 · Bash scripts should start with #!/bin/bash, and scripts starting with #!/bin/sh should not use bash-specific features, but distributions that ship with bash as /bin/sh may use bash-specific features in #!/bin/sh scripts that are specific to that distribution (it's ok as long as there's no expectation that users can switch to dash as /bin/sh and Apr 3, 2016 · # Add the Bash aliases cat /usr/sbin/bashrc_alias. Jul 5, 2016 · I am confused as to why it uses /bin/sh and why it is not found, as in my existing running container I can run /bin/bash: Command not found in alpine docker. sh CMD env Oct 6, 2016 · Docker images are pretty minimal, but you can install ping in your official ubuntu docker image via: apt-get update -y apt-get install -y iputils-ping Chances are you don't need ping on your image, and just want to use it for testing purposes. The container will run (docker run nginx-healthcheck-broken), but if you type docker ps in another terminal, you'll see it says (unhealthy) under status. 04 $ docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 08c26636709f ubuntu:18. Oct 8, 2018 · 結論ずっとbashを使いたいDocker 1. /start. 12から追加されたSHELLを使う。SHELL ["/bin/bash", "-c"]ずっとbashを使いたい(Docker 1. If you need to run a command inside a running Docker container, but don’t need any interactivity, use the docker exec command without any flags: Oct 19, 2017 · RUN entries cannot modify environment variables (I assume you want to set more variables in image_env_setup. Sep 25, 2018 · It may be easier to do this from the command line, and avoid messing with the dockerfile entirely. bashrc It worked a treat! Another option is to just use the "docker exec -it <container-name> command" from outside the container and just use your own . sh ). With it, you can get a shell into any container or image, even slim ones, without modifications. Oct 30, 2019 · The most voted answer has the correct idea, however, it did not work in my case. sh /env. You need to do any one of these two or both. docker run -it <container_name> <image_name> or. This command allows you to interact with the container in real-time, making it a powerful tool for debugging and development. docker run -ti --rm test /file. 04 "/bin/bash" 10 seconds ago Exited (0) 7 seconds ago heuristic_dubinsky b7a9f5eb6b85 rabbitmq:3 "docker-entrypoint. The image does not include /bin/bash, but if it is installed via the package manager included in Jul 11, 2019 · When bash is executing an external command in the foreground, it does not handle any signals received until the foreground process terminates (detailed explanation here ). Edit: I tried it with the following bash^M script: Sep 17, 2022 · This can appear as if the attach command is hung when in fact the process may simply not be interacting with the terminal at that time. sh 123 cmd cmd2 10054 root /usr/sbin/apache2 -k start 10055 33 /usr/sbin/apache2 -k start 10056 33 /usr/sbin/apache2 -k start $ /usr/bin/time docker stop test test real 0m 0. 5. I can run images from Docker Hub. Then, these executables can support a web app! For example, developer Soham Kamani uses this method to support a web app powered by a Go server. sh script is wrong, it's must be #!/bin/bash. sh (with permissions 755 using chmod +x start. bashrc (avoid circular dependency!) or configuring your terminal program to run /bin/bash -l as a shell program. 0-alpine image for a service (Kong API Gateway) and now I can not run apk commands to install nano, for instance. , docker exec -it docker_app_1 bash Mar 27, 2019 · HEALTHCHECK --interval=2s CMD HealthCheckTest. Sep 23, 2015 · Use the same file. Bash executes . sh. s…" Apr 5, 2020 · Google's distroless images have versions tagged debug, which contain busybox executable (with sh bundled in). Jun 9, 2016 · My Dockerfile sets up a package (ros-indigo-desktop-full) which includes environment setup scripts in bash. bashrc is executed for all bash sessions, not only login sessions. profile that is found. sh abc docker run -ti --rm test /file. For example: docker inspect docker/whalesay | jq '. Update it to use it as below. Apr 30, 2019 · I'm creating an image that has a similar problem like the following docker project: Dockerfile FROM alpine:3. Make sure your script is executable (run chmod +x Script. Next, using the Alpine Package Keeper (apk), we can install bash into the container core utilities. This command would execute and end immediately as you have not specified the interactive and the tty flags. sh and then docker exec -it container . Jul 28, 2014 · I'm creating a Dockerfile build script and would like to use bash commands. devcontainer. You can inspect an image (and use something like jless or jq to easily find things in the JSON output, if desired). sh xyz By using the CMD, Docker is searching the sayhello. /bin/sh: bash: not found. docker exec is a debugging command that's not normally part of the "build and run an image" workflow. The output of dpkg -s demonstrates that docker-compose is not installed from a package. This is a dirty hack, not a solution. While the second example implements a signal handler, for the first one it makes no difference whether the sleep is executed in foreground or not. Docker is easy to use and popular for launching applications quickly without impacting your system. json Mar 29, 2023 · Alpine-based Docker images are known for their small size and security, making them a popular choice among developers. Your shebang line in start. Mar 12, 2019 · The problem for me was that running the command conda activate env inside docker after installing caused conda to ask me to use the conda init bash command. May 24, 2016 · You must use . /script. The image does not include /bin/bash, but if it is installed via the package manager included in Introducing Docker Debug. FROM ubuntu:20. Running a Non-interactive Command in a Docker Container. 03s sys 0m 0. Depending on the image, you may also have bash available or if it’s a distroless image, then not even sh. docker run -it --user nobody busybox 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. i've also tried docker run -d img chmod +x . However, when I try to run one of my own images like this: docker run -P mylocalimage or. Aug 2, 2021 · I changed default shell into bash by making a new image with below Dockerfile commands. Q: How do I use docker run bash script? A: To use docker run bash script, you can use the following command: docker run -it /bin/bash Jan 1, 2016 · If you are using an Alpine image, you must use #!/bin/sh instead of #!/bin/bash in the first line of your bash file. sh} /bin/sh /run. /upload. /start. sh && …', or you could even go so far as to avoid bashisms (like source) entirely, and instead opt to only ever use valid POSIX equivalents, e. However, this command asks you to restart the shell, which we don't want to do inside docker. 03s Feb 3, 2018 · To run a bash script in alpine based image, you need to do either one. May 18, 2016 · Dear all, I’m facing following while trying to start a container from an image I buid myself: Container command '/bin/sh' not found or does not exist. May 18, 2017 · the thing is nothing uses it- i've tried to create new image and use this command- it returned with that err. bash_login, or ~/. What I've Apr 13, 2015 · For some scripts the solution ln -s /bin/bash /bin/bash^M will fail. Try sourcing . sh file in the PATH, BUT you copied it in / which is not in the PATH. bashrc or the . docker exec -it The command to run a command to a running container. CMD ["sh", ". Lens (Kubernetes IDE) tries multiple shell commands like this: sh -c 'clear; (bash || ash || sh)' Docker could do something similar, but it would not guarantee that the chosen shel is what you prefer. 04 ENV TERM linux ENV DEBIAN_FRONTEND noninteractive RUN apt-get update RUN apt-get install -y CMD ["/bin/bash"] # save this file as Dockerfile then in same dir issue following # # docker build --tag stens_ubuntu . /test/testing. To use Docker, install it on your platform and build your first Docker image by writing a Dockerfile. sh it will run: sudo chmod 755 upload. sh - and i got Container container is not running Apr 25, 2024 · If your container image includes a more advanced shell such as bash, you could replace sh with bash above. Simply remove the sudo from line number 5. Apr 18, 2020 · I understand sh -c calls the program sh as the interpeter and executes the script as intrepreted by this command, but what is happening in this case / why does -c cause an issue with the script? E. For this, you need to set up Docker on your local Dev machine, by going to docker. docker exec -it containerId bash Aug 31, 2024 · Docker containers create isolated environments similar to VMs without running a full operating system, enhancing portability and convenience. -t tmp $ docker run --name tmp tmp Jun 16, 2015 · I successfully shelled to a Docker container using: docker exec -i -t 69f1711a205e bash Now I need to edit file and I don't have any editors inside: root@69f1711a205e:/# nano bash: nano: command Oct 24, 2016 · If you need a shell to attach to it through docker exec, start from a small image like Alpine (which has only /bin/sh though: you would need apk add bash to add bash, as commented below by user2915097). bash to create a brand new Postgres R+ 00:44 0:00 ps aux $ docker top test PID USER COMMAND 10035 root {run. If you wish to update the running PATH Jun 9, 2017 · /usr/src/app may not be in your path so you should include the full path to the script. . vvvkmw iyyjg uwda kkxk tizxxt yrh wzb qtkym cclojo ibsv