The ssh key remains stored within the image, even if you remove the key in a layer command after adding it (see comments in this post). You can selectively copy artifacts from one stage to another, leaving behind everything you dont want in the final image. I tried copying it into /root/.ssh/, changing $HOME, creating a git ssh wrapper, and still no luck. Create a Docker context that points to the remote machine running Docker. What is the shape of orbit assuming gravity does not depend on distance? Are there any reasons to not remove air vents through an exterior bedroom wall? i tried everything to delete my container and it always coming back. Why is that so many apps today require a MacBook with an M1 chip? Hopefully this provides a simple solution for others with a similar use case. This is also security problem because it puts a private key into an image that can be easily forgotten. How to set the age range, median, and mean age. Altium remove radius on unused layer on through holes in a multilayer board, Deutsche Bahn Sparpreis Europa ticket validity. Why can't capacitors on PCBs be measured with a multimeter? Doping threaded gas pipes -- which threads are the "last" threads? You could now publish or share the second image, as the private key is not in its layers, and you would not necessarily need to remove the public key from the git website after one usage! 589). 65678192.168.X.X:56785. Why does this journey to the moon take so long? Passport "Issued in" vs. "Issuing Country" & "Issuing Authority". We still have a small risk that the passwordless private key is taken from a local computer somewhere. The Explorer window uses dockerode (which in turn uses ssh2), whereas the Docker CLI uses the ssh command, and benefits from an automatically inferred configuration. Is the DC of the Swarmkeeper ranger's Gathered Swarm feature affected by a Moon Sickle? Temporary policy: Generative AI (e.g., ChatGPT) is banned, This code is a guessing game in Python which uses a While Loop with 3 guesses, Pros and cons of "anything-can-happen" UB versus allowing particular deviations from sequential progran execution. To SSH or Not to SSH into a Docker Container As I said, I'm assuming you come from a background where virtual machines are a common thing. The Ubuntu container is running on MacOSX. 0 21 comments @ebensing. You may want to look at https://github.com/jpetazzo/nsenter which appears to be another way to open a shell on a container and execute commands within a container. @vladkras the error is pretty generic. And just see if this line of your DockerFile is applied in your file: I wound up getting this working by just creating a new user: To subscribe to this RSS feed, copy and paste this URL into your RSS reader. (Docker Toolbox is not supported. Since we don't know enough about the behavior of squash, this may still be the case even if you delete the key and squash that layer. Closed 5 days ago. Docker containers should be seen as 'services' of their own. It does not work if you're running your Docker commands from a Mac (and probably Windows, as well, though I can't confirm). @ezze Thank you very much for this very useful post :) SSH-agent is driving me crazy, I did something similar as what u did : I correctly see in docker build logs, Do not echo the private key into a file (, So, as of now, I've tried copying it into /root/.ssh/id_rsa but still receive "Host key verification failed. you will not see any mentions of SSH_KEY and SSH_KEY_PASSPHRASE in the final image. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. (Ep. Think of squash as opt-out of the files you don't want, and multistage as opt-in. Co-author uses ChatGPT for academic writing - is it ethical. Cannot ssh from inside a container to outside repository Docker Desktop for Mac docker donaldjbales (Donaldjbales) April 21, 2021, 3:05pm #1 I am installing Akeneo 3.2 in Docker Desktop for Mac. What is Catholic Church position regarding alcohol? If you edit your answer to use access token I will gladly accept it. Pros and cons of "anything-can-happen" UB versus allowing particular deviations from sequential progran execution. Of course, be aware that a passwordless private key is still insecure if someone might get a hand on your data in another way. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. In our case, the npm dependencies were specified as "git+https://github.com/", For authentication in container, the urls need to be rewritten to either be suitable for ssh authentication (ssh://git@github.com/) or token authentication (https://${GITHUB_TOKEN}@github.com/), Unfortunately, I'm on docker 1.9, so --squash option is not there yet, eventually it needs to be added. Since you can't add/copy any file outside the dockerfile context, which means it's impossible to just link ~/.ssh/id_rsa into image's /root/.ssh/id_rsa, and when you definitely need a key to do some sshed thing like git clone from a private repo link, during the building of your docker image. Furthermore, the file is then used to spin up the entire application stack with a single command. When they start using Docker, people often ask: "How do I get inside my containers?" and other people will tell them "Run an SSH server in your containers!" but that's a very bad practice. Docker Compose is a tool for defining and running multi-container Docker applications. You should see a container named sshd_ubuntu listed as well as its ID. (Ep. Anyway, after I do service ssh start, password authentication doesn't work: I think root shell is disabled. Cannot SSH to Docker Container Running on MAC, How to add SSH access to a docker container, Unable to SSH into Docker container running Alpine Linux 3.10, SSH from host machine into docker container, Docker. If you use it for deployment, then maybe use Personal access token. That data container can then be linked to the service needing it. I'm aware about docker exec option. You can use the Remote - SSH and Dev Containers extensions together. Changed the line endings of the init.sh and sshd_config files to LF using VS Code. Stack Overflow at WeAreDevelopers World Congress in Berlin, sshfs will not use ~/.ssh/config (on Linux Mint 15), 2 Factor Authentication in SSH using public key and PAM. The best answers are voted up and rise to the top, Not the answer you're looking for? Will spinning a bullet really fast without changing its linear velocity make it do more damage? It's a harder problem if you need to use SSH at build time. i can't stop docker container or delete it come back and run. If it works from a bare-metal host (not from a container), you should run the same, Actually, I see now in your outptut that it searches for the ssh keys in, @aviro that's it! Were there any planes used in WWII that were able to shoot their own tail? I imagine there's no route. How many witnesses testimony constitutes or transcends reasonable doubt? What am I doing wrong? databases) in Docker, Docker Compose wait for container X before starting Y, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing, Docker error cannot delete docker container [closed], How terrifying is giving a conference talk? Can the people who let their animals roam on the road be punished? Make sure the remote machine host key is already memorized in the known_hosts file. 'you can selectively let remote servers access your local ssh-agent as if it was running on the server', https://developer.github.com/guides/using-ssh-agent-forwarding/. A problem involving adiabatic expansion of ideal gas. How to access a docker container through SSH? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. If it's a "simple" thing you are trying to do then you can always run a command in a running container using a docker container exec command. If you omit the port, it defaults to 22. Could a race with 20th century computer technology plausibly develop general-purpose AI? That's exactly the point. You can put an answer so I could accept it, can't SSH from docker container to remote server, How terrifying is giving a conference talk? Easy peasy. I have mapped new docker container instance to use the .ssh folder as a volume and set network to the host's network. Errors: "authentication agent" or "read_passphrase: can't open /dev/tty", Trying to ssh into IPv6 address, getting "no route to host". By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. For example if you're using git clone, or in my case pip and npm to download from a private repository. UK Light Changing Rose and too many wires. We recommend at least 3000 ms. Unable to connect to Docker container from host, Docker cannot connect to the host machine. Browse other questions tagged. See Docker Load key /root/.ssh/id_rsa: invalid format for details. I can clone repo with git clone and ssh also works from powershell. If anyone can explain to me why echoing the private key might work for others, but not for me, please comment. Want to improve this question? Updated command is :: Thanks for contributing an answer to Stack Overflow! A concise overview of the challenges of SSH inside Docker containers is detailed here. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. But in my trials, I discovered that "docker cp" is for copying FROM a container to a host. How to Require PubkeyAuthentication using SSH from Linux client to Windows OpenSSH server, An exercise in Data Oriented Design & Multi Threading in C++, An immortal ant on a gridded, beveled cube divided into 3458 regions. Then you can use the new experimental --squash command (added 1.13) to merge the layers so that the keys are no longer available after removal. You should provide the location of your private key by adding the -i flag to your ssh command. Does Iowa have more farmland suitable for growing corn and wheat than Canada? if its accessible. Connect and share knowledge within a single location that is structured and easy to search. Using UV5R HTs. And many people will not read the comments. Extra: If you want cloned files to belong to a specific user you need to use chown since using other user than root inside the container will make git fail. The Docker CLI working does not mean that the Explorer window will work. Repository is private, so I'd have to either: include my gitlab login and password in compose file, which I obviously can't do or place them in env variable which I shouldn't do either. Thus, you do not need to create a new key pair at every cloning of the repo. Why is copy assignment of volatile std::atomics allowed? Windows (OpenSSH): The latest version(s) of Windows 10 include OpenSSH by default. Changed the encoding of the init.sh and sshd_config files to ISO 8859-15 using VS Code. It is recommended to change the refresh rate to something longer than the default with the docker.explorerRefreshInterval setting. I am using dockerfile and docker-compose for the setup. In my case I have several build scripts that automate my deployment. Start (Do not forget the "." Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. However, after I installed "openssh-server", and started it, the login with ssh from my host is . Item 3 in the answer by creak seems to be saying you can use docker cp to inject files into a container. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. For SSH key use in a stand-alone Docker container see the methods linked above and consider the drawbacks of each depending on your specific needs. So you should instead use: And put the id_rsa file into the same directory where your Dockerfile is. Do observers agree on forces in special relativity? Another solution instead of squashing is to add and remove the key in the same RUN command, and in between adding and removing you use it for what you need it for. Future society where tipping is mandatory. Does Iowa have more farmland suitable for growing corn and wheat than Canada? I get Error loading key "/root/.ssh/id_ed25519": invalid format. Find centralized, trusted content and collaborate around the technologies you use most. Useful for development, but not safe for production. However, if you really need ssh (for example, the container runs on a remote host), make sure the container runs sshd, here's how I do it: Install sshd and vi: sudo apt install -y openssh-server vim. 589). Why is copy assignment of volatile std::atomics allowed? By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. Is the DC of the Swarmkeeper ranger's Gathered Swarm feature affected by a Moon Sickle? . Paths are relative to the root of the filesystem. Not the answer you're looking for? When specifying the files you want to copy into the image you can only use relative paths - relative to the directory where your Dockerfile is. Without an alias, --from=0 would be the first image (=FROM namespace). Learn more about Stack Overflow the company, and our products. Use ssh://username@host:port as the Docker endpoint (replace "host" with your remote machine name, or the remote machine IP address). I made a simple docker-compose.yml to test it: It seems that docker-compose can't fetch repository I get following error when calling docker-compose up --build: I have OpenSSH Client installed (Windows 10 port) and %SYSTEMROOT%\System32\OpenSSH\ added to PATH, I also set GIT_SSH to C:\Windows\System32\OpenSSH\ssh.exe. What would a potion that increases resistance to damage actually do to the body? (Sorry!) docker exec -i xiaoya . I have my ssh-agent running as a service which is why I want to access repo using ssh. With multi-stage, you know you are only bringing in the artifacts you want. Is there something missing in this sentence? Future society where tipping is mandatory. then pass args from build script like this: And remove the intermediate container it for security. @SadanArshad It turns out this functionality is currently only supported if you are running Docker from a Linux machine. Using SSH keys inside docker container Ask Question Asked 9 years, 11 months ago Modified 1 year, 3 months ago Viewed 529k times 479 I have an app that executes various fun stuff with Git (like running git clone & git push) and I'm trying to docker-ize it. The Overflow #186: Do large language models know what theyre talking about? This is obsolete or incorrect. GitHub / GitLab --> profile --> SSH keys). What's the significance of a C function declaration in parentheses apparently forever calling itself? Is there a good way to inspect the docker container's files? Temporary policy: Generative AI (e.g., ChatGPT) is banned, Failed to ssh to machine after installing Docker. How would I say the imperative command "Heal!"? Which is the safest option as the previous builds can only ever be used by the subsequent build and are then destroyed, See the answer to my stackoverflow question for more info, I'm trying to work the problem the other way: adding public ssh key to an image. Stack Overflow at WeAreDevelopers World Congress in Berlin. We use "alpine" as the smallest possible base image which uses apk instead of apt-get; you can also use apt-get with the above code instead using FROM ubuntu:latest. This question does not meet Stack Overflow guidelines. Version 1.80 is now available! Does air in the atmosphere get friction due to the planet's rotation? Modify a little the Dockerfile and mount your local Start the container directly mounting the volume: $ docker run -it --rm -v ~/.ssh:/home/user/.ssh:ro \ ssh-test ssh. Probability of getting 2 cards with the same color. Book on a couple found frozen in ice by a doctor/scientist comes back to life. Configure ssh-agent on the local system with the private key file produced above. Method 1: Use docker exec to Run Commands in a Docker Container The docker exec command runs a specified command within an already running container. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing, How terrifying is giving a conference talk? Were there any planes used in WWII that were able to shoot their own tail? You would need to install and setup an SSH server in your container. I had to do two more things to get it to work: 1) add my private key to ssh-agent with. This is bad, as anyone with access to the image has access to your private key. Something like this should work: Remember that docker runs with sudo (unless you don't), if this is the case you'll be using the root ssh keys. Noob Question: How can I write bulk, monolayer and bilayer structure in input file for visualizing it. Can I travel between France and UK on my US passport while I wait for my French passport to be ready? Cannot SSH into custom docker container using ssh-agent Build Environment ssh, keys, docker matthiasbalke June 22, 2017, 5:44pm #1 For one of my projects ( rsync-cache I build an integration test suite. Good call! 3) Same for the ssh-key: put it is a volume (as suggested above) and link it to the git clone service when you need it. Windows container images are not supported.) Note 2: Make sure you have the proper file permissions set on your script files so that they can be run. Is there something missing in this sentence? Bass line and chord mismatch - Afternoon in Paris, How to set the age range, median, and mean age. I have not been able to get this to work at all. 5 I'm trying to use docker-compose to fetch, build and run multiple services from their git repositories. @ccpizza , I view that as an advantage. The Overflow #186: Do large language models know what theyre talking about? Can I travel between France and UK on my US passport while I wait for my French passport to be ready? ), So I don't get that Bad owner or permissions on /root/.ssh/.. error which was noted by @kross. That link seems very promising. There is a Windows service, ssh-agent that is disabled by default, and needs to be re-enabled and set to automatic start. Find centralized, trusted content and collaborate around the technologies you use most. rev2023.7.17.43537. Improve this question. I think it's worth pointing out that with this solution you'll get an error in the container if you try using SSH before the key you need is added to the agent on the host. Use ssh-keygen or similar to get and configure a public/private key pair for SSH authentication. Pros and cons of "anything-can-happen" UB versus allowing particular deviations from sequential progran execution. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. How can I delete all local Docker images? Set PermitRootLogin yes in sshd_config: sudo vi /etc/ssh/sshd_config. If the private key is stored in the image, you need to pay attention that you delete the public key from the git website, or that you do not publish the image. In order to inject you ssh key, within a container, you have multiple solutions: Using a Dockerfile with the ADD instruction, you can inject it during your build process, Simply doing something like cat id_rsa | docker run -i sh -c 'cat > /root/.ssh/id_rsa'. Specifically for Windows this might help. If you don't see 127.0.0.1. Do ssh-add . How to pass local machine's SSH key to docker container? Turns out when using Ubuntu, the ssh_config isn't correct. Restart sshd service: sudo service ssh restart. or is there something different for alpine:3.10.3? As to the dangerously wrong advice in the two highly upvoted answers here that use the problematic echo-of-the-private-key approach, here are the votes at the time of writing: We see here that something must be wrong in the answers, as the top 1 answer votes are not at least on the level of the question votes. Squash is unnecessary, and risk prone. However, it looks like the SSH key is only available at build time, not at runtime. Thank you! Above there is an answer answering this. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing, Okay great. 589). Check this out for more details: http://docs.docker.io/reference/builder/#add. Do ssh-add . rev2023.7.17.43537. I would rather say that even if you show the best approach regarding security here, it does not answer the question of how to finally ssh into the server. So I'd like to ask if you use a container to SSH into your server, if yes which one and if not why? @CppLearner you are right, this does store the key in the image, and that might be a security issue in some cases. Forward the ssh authentication socket to the container: Your script will be able to perform a git clone. Are there number systems with fractional or irrational bases? Any issues to be expected to with Port of Entry Process? Can't ssh into docker container Ask Question Asked 3 years, 4 months ago Modified 3 years, 4 months ago Viewed 405 times 0 I'm trying to run an openssh-server container and then connect to it: docker run \ --name=openssh-server \ -p 22:22 \ -e USER_PASSWORD=123 \ -e USER_NAME=testuser \ --restart unless-stopped \ linuxserver/openssh-server Verify that your identity is available to the agent with ssh-add -l. It should list one or more identities that look something like 2048 SHA256:abcdefghijk somethingsomething (RSA). 1 Answer Sorted by: 4 You're using the ip of your container but the host port mapping of container. Can SSH in but not out of docker container: network unreachable Ask Question Asked 6 years, 11 months ago Modified 6 years, 11 months ago Viewed 2k times 0 Real docker noob here, trying to get an ubuntu container that can be accessed via SSH. The Overflow #186: Do large language models know what theyre talking about? For connecting to trusted remotes from within a container without leaking secrets there are a few ways: Beyond these there's also the possibility of using a key-store running in a separate docker container accessible at runtime when using Compose. You can see it in. For security reasons, create a new public and private SSH key pair - even if you already have another one lying around - for each Dockerfile run. Super User is a question and answer site for computer enthusiasts and power users. To see in which hosts the sshd is listening. As far as i know, "build:" is the path where your Dockerfile is located. If you do not want to have the key stored in a layer of your image, the link says: just build a new image from the old image and take over just the layers that you need (without the key layers) - and delete the old image. What is the state of the art of splitting a binary file by size? Windows 10 Home (2004+) requires Docker Desktop 2.3+ and the WSL 2 back-end. 1 on my host server I have my user with generated private and public keys. Password authentication is not supported by Docker and not possible with a DOCKER_HOST-based configuration. Docker, how to remote ssh from command line host to a docker container? Bass line and chord mismatch - Afternoon in Paris. Find out all the different files from two different paths efficiently in Windows (with Python). Power Query Editor: Why are null Values Matching on an Inner Join? Not sure exactly how to debug this one. Would not say so, I have seen two upvotes in five days for a new answer, that shows that low voted answers are read because the top voted are not good enough (top 1 is just half of the question votes). Rivers of London short about Magical Signature. I have not tested it, but it sounds obvious. Connect and share knowledge within a single location that is structured and easy to search. You can use secrets to manage any sensitive data which a container This should be mentioned as an answer in this thread, not just as a very good side-note :). There isan issue with ssh-keygen utility that comes with Windows 10 build 1909 and olderthat prevents it from working properly with newer SSH daemons (for example, the one that comes with Ubuntu 20.04 LTS and newer). 589). Also, it needs to have the right identity. Why is the Work on a Spring Independent of Applied Force? You could introduce it as a stopgap measure to integrate with legacy deployment systems. We generate a pre-sign URL to access the key with aws s3 cli, and limit the access for about 5 minutes, we save this pre-sign URL into a file in repo directory, then in dockerfile we add it to the image. You can also manually run that command each login.

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