Is there a way to use the VSCode Remote SSH extension to interact with a remote host that does not allow outbound internet connections?
Is it possible to download the vscode-server files from another system and copy to host?
I read this but I can't connect the server to internet.
When you connect to a host it executes a bash script that wgets or curls a tarball and extracts it in a directory in your home directory. Here's an offline workaround.
Attempt to connect, let it fail
On server, get the commit id
$ ls ~/.vscode-server/bin
553cfb2c2205db5f15f3ee8395bbd5cf066d357d
Download tarball replacing $COMMIT_ID with the the commit number from the previous step
For Stable Version
https://update.code.visualstudio.com/commit:$COMMIT_ID/server-linux-x64/stable
For Insider Version
https://update.code.visualstudio.com/commit:$COMMIT_ID/server-linux-x64/insider
Move tarball to ~/.vscode-server/bin/$COMMIT_ID/vscode-server-linux-x64.tar.gz
Extract tarball in this directory
$ cd ~/.vscode-server/bin/$COMMIT_ID
$ tar -xvzf vscode-server-linux-x64.tar.gz --strip-components 1
Connect again
You'll still need to install any extensions manually. There's a download button next to all the extensions in the marketplace. Once you have the .vsix file you can install them through the GUI with the Install from VSIX option in the extensions manager.
This is kind of a pain and hopefully they improve this process, but if you have a network-based home directory, you only have to do this once.
open vscode -> about
Version: 1.46.1
Commit: cd9ea6488829f560dc949a8b2fb789f3cdc05f5d
Date: 2020-06-17T21:17:14.222Z
Electron: 7.3.1
Chrome: 78.0.3904.130
Node.js: 12.8.1
V8: 7.8.279.23-electron.0
OS: Darwin x64 17.7.0
$COMMIT_ID = cd9ea6488829f560dc949a8b2fb789f3cdc05f5d
A new feature is being added to support offline install
However, you can now solve this issue by a new user setting in the Remote - SSH extension. If you enable the setting remote.SSH.allowLocalServerDownload, the extension will install the VS Code Server on the client first and then copy it over to the server via SCP.
Note: This is currently an experimental feature but will be turned on by default in the next release
https://code.visualstudio.com/blogs/2019/10/03/remote-ssh-tips-and-tricks
A a work around I have done the following:
Desktop ~/.ssh/config
...
Host *
RemoteForward 54321
...
Remote: ~/bin/wget in which ~/bin is added to PATH via .bashrc
#!/bin/bash
export LD_LIBRARY_PATH=$HOME/opt/lib/tsocks/
export TSOCKS_CONF_FILE=$HOME/opt/tsocks/tsocks.conf
$HOME/bin/tsocks /usr/bin/wget $#
Remote: ~/opt/tsocks/tsocks.conf
server = 127.0.0.1
server_port = 54321
server_type = 5
note tsocks binary has been scp-ed to ~/bin/tsocks and ~/opt/tsocks/ has been created with libtsocks.so which is normally stored in /usr/lib64/libtsocks.so
This is a work around that allows me to have wget functionality with out messing with anything outside my profile to get it to work (eg: no root required ... even though I have it).
Current Version of VS Code: 1.48.2
I just kill the wget process on the server end, and let the client download the archive and transfer it to the server end. That's quite easy as below.
make sure that you set in settings.json
"remote.SSH.allowLocalServerDownload": true,
execute the shell scrpits below.
# to find the <pid>
ps aux | grep wget | grep vscode-server
# kill the process
kill -9 <pid>
# then wait for the client downloading and transferring
# optional: If you want to know the progress, just
cd ~/.vscode-server/bin/<commit-id>/
watch -n 1 -d ls -rthl
I know intellij has a docker container plugin, however it doesn't seem to allow me to develop inside the container itself. The idea is simple, I don't want to configure my host to have the correct environment tools. I'd rather just a docker container setup and then use intellij to find libs, functionality and such with in the container itself.
This would be incredibly helpful for c++, java, and scala dev. Also it would be useful debugging as well.
So is it possible to develop within a docker container with intellij?
So you just want to work within a container just as you would within a full-blown VM, right? Then you should just run a container, attach a display (to run IDEA) and start configuring your development environment.
For the display part I'd test some answers given in Can you run GUI apps in a docker container?. There are some very cool answers in this topic showing various approaches to running GUI apps within a container.
Shouldn't the approach be rather:
Have local repository and local IDE. In the repository have docker file and eventually docker-compose.yml, which spins up environment required to run project.
Mount your local drive with sources into docker (volumes), so changes done in your local folder are reflected in docker, similar in other direction.
Please look at this example for Intellij IDEA CI and JDK8 based on Alpine Linux (taken here
https://raw.githubusercontent.com/shaharv/docker/master/alpine/dev/Dockerfile)
# Alpine 3.8 C++/Java Developer Image
#
# For IntelliJ and GUI (X11), run the image with:
# $ XSOCK=/tmp/.X11-unix && sudo docker run -i -v $XSOCK:$XSOCK -e DISPLAY -u developer -t [image-name]
#
# Then run IntelliJ with:
# /idea-IC-191.6707.61/bin/idea.sh
FROM alpine:3.8
ENV LANG C.UTF-8
RUN set -ex && \
apk add --no-cache --update \
# basic packages
bash bash-completion coreutils file grep openssl openssh nano sudo tar xz \
# debug tools
gdb musl-dbg strace \
# docs and man
bash-doc man man-pages less less-doc \
# GUI fonts
font-noto \
# user utils
shadow
RUN set -ex && \
apk add --no-cache --update \
# C++ build tools
cmake g++ git linux-headers libpthread-stubs make
RUN set -ex && \
apk add --no-cache --update \
# Java tools
gradle openjdk8 openjdk8-dbg
# Install IntelliJ Community
RUN set -ex && \
wget https://download-cf.jetbrains.com/idea/ideaIC-2019.1.1-no-jbr.tar.gz && \
tar -xf ideaIC-2019.1.1-no-jbr.tar.gz && \
rm ideaIC-2019.1.1-no-jbr.tar.gz
# Create a new user with no password
ENV USERNAME developer
RUN set -ex && \
useradd --create-home --key MAIL_DIR=/dev/null --shell /bin/bash $USERNAME && \
passwd -d $USERNAME
# Set additional environment variables
ENV JAVA_HOME /usr/lib/jvm/java-1.8-openjdk
ENV JDK_HOME /usr/lib/jvm/java-1.8-openjdk
ENV JAVA_EXE /usr/lib/jvm/java-1.8-openjdk/bin/java
There is a better way to do this now with Jetbrains Gateway. Just make sure you have OpenSSH server installed (latest Ubuntu containers have this already installed) in the container that you initially ran with exposed ports, i.e. -p 220:22 (I like 220) and the SSH service running, i.e. service ssh start, after modifying the /etc/ssh/sshd_config to enable root login and password authentication then service ssh restart. Make sure you set a password for the root user, i.e. passwd root, (or go through other steps to setup a new user). Then all you need to do is open Jetbrains Gateway, and SSH to the container with the fields set thus: user=root, host=localhost, and port=220 (or whatever you chose); note, you will also need to specify a project location, which in my use case is a Java application repository root directory -- this means you will need to have Java and Maven or whatever other tools installed in the container at some point, but doesn't affect ability to connect. Assuming you connect with no issues you will see activity whereby Gateway installs an IDE backend inside the container (takes about 10 minutes) and then starts up a IDE client which is a light version of IntelliJ (or whatever other IDE version you selected) that is honestly a bit buggy at time of writing. But it works and has unblocked some of my colleagues stuck with Windows machines and not many options to upgrade to Macs in the current chip shortage environment. Note that any time you restart the container you also need to restart the SSH service unless you script it to automatically start up when the container does.
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.
I'm running into an issue though where I need to be able to add an SSH key to the container for the container 'user' to use.
I tried copying it into /root/.ssh/, changing $HOME, creating a git ssh wrapper, and still no luck.
Here is the Dockerfile for reference:
#DOCKER-VERSION 0.3.4
from ubuntu:12.04
RUN apt-get update
RUN apt-get install python-software-properties python g++ make git-core openssh-server -y
RUN add-apt-repository ppa:chris-lea/node.js
RUN echo "deb http://archive.ubuntu.com/ubuntu precise universe" >> /etc/apt/sources.list
RUN apt-get update
RUN apt-get install nodejs -y
ADD . /src
ADD ../../home/ubuntu/.ssh/id_rsa /root/.ssh/id_rsa
RUN cd /src; npm install
EXPOSE 808:808
CMD [ "node", "/src/app.js"]
app.js runs the git commands like git pull
It's a harder problem if you need to use SSH at build time. For example if you're using git clone, or in my case pip and npm to download from a private repository.
The solution I found is to add your keys using the --build-arg flag. 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. Here's my solution:
Build command
$ docker build -t example --build-arg ssh_prv_key="$(cat ~/.ssh/id_rsa)" --build-arg ssh_pub_key="$(cat ~/.ssh/id_rsa.pub)" --squash .
Dockerfile
FROM python:3.6-slim
ARG ssh_prv_key
ARG ssh_pub_key
RUN apt-get update && \
apt-get install -y \
git \
openssh-server \
libmysqlclient-dev
# Authorize SSH Host
RUN mkdir -p /root/.ssh && \
chmod 0700 /root/.ssh && \
ssh-keyscan github.com > /root/.ssh/known_hosts
# Add the keys and set permissions
RUN echo "$ssh_prv_key" > /root/.ssh/id_rsa && \
echo "$ssh_pub_key" > /root/.ssh/id_rsa.pub && \
chmod 600 /root/.ssh/id_rsa && \
chmod 600 /root/.ssh/id_rsa.pub
# Avoid cache purge by adding requirements first
ADD ./requirements.txt /app/requirements.txt
WORKDIR /app/
RUN pip install -r requirements.txt
# Remove SSH keys
RUN rm -rf /root/.ssh/
# Add the rest of the files
ADD . .
CMD python manage.py runserver
Update: If you're using Docker 1.13 and have experimental features on you can append --squash to the build command which will merge the layers, removing the SSH keys and hiding them from docker history.
Turns out when using Ubuntu, the ssh_config isn't correct. You need to add
RUN echo " IdentityFile ~/.ssh/id_rsa" >> /etc/ssh/ssh_config
to your Dockerfile in order to get it to recognize your ssh key.
Note: only use this approach for images that are private and will always be!
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).
In my case this is ok, so this is what I am using:
# Setup for ssh onto github
RUN mkdir -p /root/.ssh
ADD id_rsa /root/.ssh/id_rsa
RUN chmod 700 /root/.ssh/id_rsa
RUN echo "Host github.com\n\tStrictHostKeyChecking no\n" >> /root/.ssh/config
If you are using Docker Compose an easy choice is to forward SSH agent like that:
something:
container_name: something
volumes:
- $SSH_AUTH_SOCK:/ssh-agent # Forward local machine SSH key to docker
environment:
SSH_AUTH_SOCK: /ssh-agent
or equivalently, if using docker run:
$ docker run --mount type=bind,source=$SSH_AUTH_SOCK,target=/ssh-agent \
--env SSH_AUTH_SOCK=/ssh-agent \
some-image
Expanding Peter Grainger's answer I was able to use multi-stage build available since Docker 17.05. Official page states:
With multi-stage builds, you use multiple FROM statements in your Dockerfile. Each FROM instruction can use a different base, and each of them begins a new stage of the build. You can selectively copy artifacts from one stage to another, leaving behind everything you don’t want in the final image.
Keeping this in mind here is my example of Dockerfile including three build stages. It's meant to create a production image of client web application.
# Stage 1: get sources from npm and git over ssh
FROM node:carbon AS sources
ARG SSH_KEY
ARG SSH_KEY_PASSPHRASE
RUN mkdir -p /root/.ssh && \
chmod 0700 /root/.ssh && \
ssh-keyscan bitbucket.org > /root/.ssh/known_hosts && \
echo "${SSH_KEY}" > /root/.ssh/id_rsa && \
chmod 600 /root/.ssh/id_rsa
WORKDIR /app/
COPY package*.json yarn.lock /app/
RUN eval `ssh-agent -s` && \
printf "${SSH_KEY_PASSPHRASE}\n" | ssh-add $HOME/.ssh/id_rsa && \
yarn --pure-lockfile --mutex file --network-concurrency 1 && \
rm -rf /root/.ssh/
# Stage 2: build minified production code
FROM node:carbon AS production
WORKDIR /app/
COPY --from=sources /app/ /app/
COPY . /app/
RUN yarn build:prod
# Stage 3: include only built production files and host them with Node Express server
FROM node:carbon
WORKDIR /app/
RUN yarn add express
COPY --from=production /app/dist/ /app/dist/
COPY server.js /app/
EXPOSE 33330
CMD ["node", "server.js"]
.dockerignore repeats contents of .gitignore file (it prevents node_modules and resulting dist directories of the project from being copied):
.idea
dist
node_modules
*.log
Command example to build an image:
$ docker build -t ezze/geoport:0.6.0 \
--build-arg SSH_KEY="$(cat ~/.ssh/id_rsa)" \
--build-arg SSH_KEY_PASSPHRASE="my_super_secret" \
./
If your private SSH key doesn't have a passphrase just specify empty SSH_KEY_PASSPHRASE argument.
This is how it works:
1). On the first stage only package.json, yarn.lock files and private SSH key are copied to the first intermediate image named sources. In order to avoid further SSH key passphrase prompts it is automatically added to ssh-agent. Finally yarn command installs all required dependencies from NPM and clones private git repositories from Bitbucket over SSH.
2). The second stage builds and minifies source code of web application and places it in dist directory of the next intermediate image named production. Note that source code of installed node_modules is copied from the image named sources produced on the first stage by this line:
COPY --from=sources /app/ /app/
Probably it also could be the following line:
COPY --from=sources /app/node_modules/ /app/node_modules/
We have only node_modules directory from the first intermediate image here, no SSH_KEY and SSH_KEY_PASSPHRASE arguments anymore. All the rest required for build is copied from our project directory.
3). On the third stage we reduce a size of the final image that will be tagged as ezze/geoport:0.6.0 by including only dist directory from the second intermediate image named production and installing Node Express for starting a web server.
Listing images gives an output like this:
REPOSITORY TAG IMAGE ID CREATED SIZE
ezze/geoport 0.6.0 8e8809c4e996 3 hours ago 717MB
<none> <none> 1f6518644324 3 hours ago 1.1GB
<none> <none> fa00f1182917 4 hours ago 1.63GB
node carbon b87c2ad8344d 4 weeks ago 676MB
where non-tagged images correpsond to the first and the second intermediate build stages.
If you run
$ docker history ezze/geoport:0.6.0 --no-trunc
you will not see any mentions of SSH_KEY and SSH_KEY_PASSPHRASE in the final 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 <image> sh -c 'cat > /root/.ssh/id_rsa'
Using the docker cp command which allows you to inject files while a container is running.
This is now available since 18.09 release!
According to the documentation:
The docker build has a --ssh option to allow the Docker Engine to
forward SSH agent connections.
Here is an example of Dockerfile using SSH in the container:
# syntax=docker/dockerfile:experimental
FROM alpine
# Install ssh client and git
RUN apk add --no-cache openssh-client git
# Download public key for github.com
RUN mkdir -p -m 0600 ~/.ssh && ssh-keyscan github.com >> ~/.ssh/known_hosts
# Clone private repository
RUN --mount=type=ssh git clone git#github.com:myorg/myproject.git myproject
Once the Dockerfile is created, use the --ssh option for connectivity with the SSH agent:
$ docker build --ssh default .
Also, take a look at https://medium.com/#tonistiigi/build-secrets-and-ssh-forwarding-in-docker-18-09-ae8161d066
One cross-platform solution is to use a bind mount to share the host's .ssh folder to the container:
docker run -v /home/<host user>/.ssh:/home/<docker user>/.ssh <image>
Similar to agent forwarding this approach will make the public keys accessible to the container. An additional upside is that it works with a non-root user too and will get you connected to GitHub. One caveat to consider, however, is that all contents (including private keys) from the .ssh folder will be shared so this approach is only desirable for development and only for trusted container images.
Starting from docker API 1.39+ (Check API version with docker version) docker build allows the --ssh option with either an agent socket or keys to allow the Docker Engine to forward SSH agent connections.
Build Command
export DOCKER_BUILDKIT=1
docker build --ssh default=~/.ssh/id_rsa .
Dockerfile
# syntax=docker/dockerfile:experimental
FROM python:3.7
# Install ssh client (if required)
RUN apt-get update -qq
RUN apt-get install openssh-client -y
# Download public key for github.com
RUN --mount=type=ssh mkdir -p -m 0600 ~/.ssh && ssh-keyscan github.com >> ~/.ssh/known_hosts
# Clone private repository
RUN --mount=type=ssh git clone git#github.com:myorg/myproject.git myproject
More Info:
https://docs.docker.com/develop/develop-images/build_enhancements/#using-ssh-to-access-private-data-in-builds
https://github.com/moby/buildkit/blob/master/frontend/dockerfile/docs/experimental.md#run---mounttypessh
This line is a problem:
ADD ../../home/ubuntu/.ssh/id_rsa /root/.ssh/id_rsa
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. So you should instead use:
ADD id_rsa /root/.ssh/id_rsa
And put the id_rsa file into the same directory where your Dockerfile is.
Check this out for more details: http://docs.docker.io/reference/builder/#add
Docker containers should be seen as 'services' of their own. To separate concerns you should separate functionalities:
1) Data should be in a data container: use a linked volume to clone the repo into. That data container can then be linked to the service needing it.
2) Use a container to run the git cloning task, (i.e it's only job is cloning) linking the data container to it when you run it.
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
That way, both the cloning task and the key are ephemeral and only active when needed.
Now if your app itself is a git interface, you might want to consider github or bitbucket REST APIs directly to do your work: that's what they were designed for.
We had similar problem when doing npm install in docker build time.
Inspired from solution from Daniel van Flymen and combining it with git url rewrite, we found a bit simpler method for authenticating npm install from private github repos - we used oauth2 tokens instead of the keys.
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://${GITHUB_TOKEN}#github.com/)
Build command:
docker build -t sometag --build-arg GITHUB_TOKEN=$GITHUB_TOKEN .
Unfortunately, I'm on docker 1.9, so --squash option is not there yet, eventually it needs to be added
Dockerfile:
FROM node:5.10.0
ARG GITHUB_TOKEN
#Install dependencies
COPY package.json ./
# add rewrite rule to authenticate github user
RUN git config --global url."https://${GITHUB_TOKEN}#github.com/".insteadOf "https://github.com/"
RUN npm install
# remove the secret token from the git config file, remember to use --squash option for docker build, when it becomes available in docker 1.13
RUN git config --global --unset url."https://${GITHUB_TOKEN}#github.com/".insteadOf
# Expose the ports that the app uses
EXPOSE 8000
#Copy server and client code
COPY server /server
COPY clients /clients
Forward the ssh authentication socket to the container:
docker run --rm -ti \
-v $SSH_AUTH_SOCK:/tmp/ssh_auth.sock \
-e SSH_AUTH_SOCK=/tmp/ssh_auth.sock \
-w /src \
my_image
Your script will be able to perform a git clone.
Extra: If you want cloned files to belong to a specific user you need to use chown since using other user than root inside the container will make git fail.
You can do this publishing to the container's environment some additional variables:
docker run ...
-e OWNER_USER=$(id -u) \
-e OWNER_GROUP=$(id -g) \
...
After you clone you must execute chown $OWNER_USER:$OWNER_GROUP -R <source_folder> to set the proper ownership before you leave the container so the files are accessible by a non-root user outside the container.
You can use multi stage build to build containers
This is the approach you can take :-
Stage 1 building an image with ssh
FROM ubuntu as sshImage
LABEL stage=sshImage
ARG SSH_PRIVATE_KEY
WORKDIR /root/temp
RUN apt-get update && \
apt-get install -y git npm
RUN mkdir /root/.ssh/ &&\
echo "${SSH_PRIVATE_KEY}" > /root/.ssh/id_rsa &&\
chmod 600 /root/.ssh/id_rsa &&\
touch /root/.ssh/known_hosts &&\
ssh-keyscan github.com >> /root/.ssh/known_hosts
COPY package*.json ./
RUN npm install
RUN cp -R node_modules prod_node_modules
Stage 2: build your container
FROM node:10-alpine
RUN mkdir -p /usr/app
WORKDIR /usr/app
COPY ./ ./
COPY --from=sshImage /root/temp/prod_node_modules ./node_modules
EXPOSE 3006
CMD ["npm", "run", "dev"]
add env attribute in your compose file:
environment:
- SSH_PRIVATE_KEY=${SSH_PRIVATE_KEY}
then pass args from build script like this:
docker-compose build --build-arg SSH_PRIVATE_KEY="$(cat ~/.ssh/id_rsa)"
And remove the intermediate container it for security.
This Will help you cheers.
I ran into the same problem today and little bit modified version with previous posts I found this approach more useful to me
docker run -it -v ~/.ssh/id_rsa:/root/.my-key:ro image /bin/bash
(Note that readonly flag so container will not mess my ssh key in any case.)
Inside container I can now run:
ssh-agent bash -c "ssh-add ~/.my-key; git clone <gitrepourl> <target>"
So I don't get that Bad owner or permissions on /root/.ssh/.. error which was noted by #kross
This issue is really an annoying one. 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.
Anyways, I found a solution to workaround, not so persuading but did work for me.
in your dockerfile:
add this file as /root/.ssh/id_rsa
do what you want, such as git clone, composer...
rm /root/.ssh/id_rsa at the end
a script to do in one shoot:
cp your key to the folder holding dockerfile
docker build
rm the copied key
anytime you have to run a container from this image with some ssh requirements, just add -v for the run command, like:
docker run -v ~/.ssh/id_rsa:/root/.ssh/id_rsa --name container image command
This solution results in no private key in both you project source and the built docker image, so no security issue to worry about anymore.
As eczajk already commented in Daniel van Flymen's answer it does not seem to be safe to remove the keys and use --squash, as they still will be visible in the history (docker history --no-trunc).
Instead with Docker 18.09, you can now use the "build secrets" feature. In my case I cloned a private git repo using my hosts SSH key with the following in my Dockerfile:
# syntax=docker/dockerfile:experimental
[...]
RUN --mount=type=ssh git clone [...]
[...]
To be able to use this, you need to enable the new BuildKit backend prior to running docker build:
export DOCKER_BUILDKIT=1
And you need to add the --ssh default parameter to docker build.
More info about this here: https://medium.com/#tonistiigi/build-secrets-and-ssh-forwarding-in-docker-18-09-ae8161d066
At first, some meta noise
There is a dangerously wrong advice in two highly upvoted answers here.
I commented, but since I have lost many days with this, please MIND:
Do not echo the private key into a file (meaning: echo "$ssh_prv_key" > /root/.ssh/id_ed25519). This will destroy the needed line format, at least in my case.
Use COPY or ADD instead. See Docker Load key “/root/.ssh/id_rsa”: invalid format for details.
This was also confirmed by another user:
I get Error loading key "/root/.ssh/id_ed25519": invalid format. Echo will
remove newlines/tack on double quotes for me. Is this only for ubuntu
or is there something different for alpine:3.10.3?
1. A working way that keeps the private key in the image (not so good!)
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. If you take care of this, this is secure. See below (2.) for a better way where you could also "forget to pay attention".
The Dockerfile looks as follows:
FROM ubuntu:latest
RUN apt-get update && apt-get install -y git
RUN mkdir -p /root/.ssh && chmod 700 /root/.ssh
COPY /.ssh/id_ed25519 /root/.ssh/id_ed25519
RUN chmod 600 /root/.ssh/id_ed25519 && \
apt-get -yqq install openssh-client && \
ssh-keyscan -t ed25519 -H gitlab.com >> /root/.ssh/known_hosts
RUN git clone git#gitlab.com:GITLAB_USERNAME/test.git
RUN rm -r /root/.ssh
2. A working way that does not keep the private key in the image (good!)
The following is the more secure way of the same thing, using "multi stage build" instead.
If you need an image that has the git repo directory without the private key stored in one of its layers, you need two images, and you only use the second in the end. That means, you need FROM two times, and you can then copy only the git repo directory from the first to the second image, see the official guide "Use multi-stage builds".
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.
The Dockerfile looks as follows:
# first image only to download the git repo
FROM alpine as MY_TMP_GIT_IMAGE
RUN apk add --no-cache git
RUN mkdir -p /root/.ssh && chmod 700 /root/.ssh
COPY /.ssh/id_ed25519 /root/.ssh/id_ed25519
RUN chmod 600 /root/.ssh/id_ed25519
RUN apk -yqq add --no-cache openssh-client && ssh-keyscan -t ed25519 -H gitlab.com >> /root/.ssh/known_hosts
RUN git clone git#gitlab.com:GITLAB_USERNAME/test.git
RUN rm -r /root/.ssh
# Start of the second image
FROM MY_BASE_IMAGE
COPY --from=MY_TMP_GIT_IMAGE /MY_GIT_REPO ./MY_GIT_REPO
We see here that FROM is just a namespace, it is like a header for the lines below it and can be addressed with an alias. Without an alias, --from=0 would be the first image (=FROM namespace).
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! Thus, you do not need to create a new key pair at every cloning of the repo. Of course, be aware that a passwordless private key is still insecure if someone might get a hand on your data in another way. If you are not sure about this, better remove the public key from the server after usage, and have a new key pair at every run.
A guide how to build the image from the Dockerfile
Install Docker Desktop; or use docker inside WSL2 or Linux in a VirtualBox; or use docker in a standalone Linux partition / hard drive.
Open a command prompt (PowerShell, terminal, ...).
Go to the directory of the Dockerfile.
Create a subfolder ".ssh/".
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. In the command prompt, in your Dockerfile's folder, enter (mind, this overwrites without asking):
Write-Output "y" | ssh-keygen -q -t ed25519 -f ./.ssh/id_ed25519 -N '""'
(if you use PowerShell) or
echo "y" | ssh-keygen -q -t ed25519 -f ./.ssh/id_ed25519 -N ''
(if you do not use PowerShell).
Your key pair will now be in the subfolder .ssh/. It is up to you whether you use that subfolder at all, you can also change the code to COPY id_ed25519 /root/.ssh/id_ed25519; then your private key needs to be in the Dockerfile's directory that you are in.
Open the public key in an editor, copy the content and publish it to your server (e.g. GitHub / GitLab --> profile --> SSH keys). You can choose whatever name and end date. The final readable comment of the public key string (normally your computer name if you did not add a -C comment in the parameters of ssh-keygen) is not important, just leave it there.
Start (Do not forget the "." at the end which is the build context):
docker build -t test .
Only for 1.):
After the run, remove the public key from the server (most important, and at best at once). The script removes the private key from the image, and you may also remove the private key from your local computer, since you should never use the key pair again. The reason: someone could get the private key from the image even if it was removed from the image. Quoting a user's comment:
If anyone gets a hold of your
image, they can retrieve the key... even if you delete that file in a
later layer, b/c they can go back to Step 7 when you added it
The attacker could wait with this private key until you use the key pair again.
Only for 2.):
After the run, since the second image is the only image remaining after a build, we do not necessarily need to remove the key pair from client and host. We still have a small risk that the passwordless private key is taken from a local computer somewhere. That is why you may still remove the public key from the git server. You may also remove any stored private keys. But it is probably not needed in many projects where the main aim is rather to automate building the image, and less the security.
At last, some more meta noise
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:
https://stackoverflow.com/a/42125241/11154841 176 upvotes (top 1)
https://stackoverflow.com/a/48565025/11154841 55 upvotes (top 5)
While the question at 326k views, got a lot more: 376 upvotes
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.
There was just one small and unvoted comment at the end of the comment list of the top 1 answer naming the same echo-of-the-private-key problem (which is also quoted in this answer). And: that critical comment was made three years after the answer.
I have upvoted the top 1 answer myself. I only realised later that it would not work for me. Thus, swarm intelligence is working, but on a low flame? If anyone can explain to me why echoing the private key might work for others, but not for me, please comment. Else, 326k views (minus 2 comments ;) ) would have overseen or left aside the error of the top 1 answer. I would not write such a long text here if that echo-of-the-private-key code line would not have cost me many working days, with absolutely frustrating code picking from everything on the net.
'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/
You can also link your .ssh directory between the host and the container, I don't know if this method has any security implications but it may be the easiest method. Something like this should work:
$ sudo docker run -it -v /root/.ssh:/root/.ssh someimage bash
Remember that docker runs with sudo (unless you don't), if this is the case you'll be using the root ssh keys.
A concise overview of the challenges of SSH inside Docker containers is detailed here. For connecting to trusted remotes from within a container without leaking secrets there are a few ways:
SSH agent forwarding (Linux-only, not straight-forward)
Inbuilt SSH with BuildKit (Experimental, not yet supported by Compose)
Using a bind mount to expose ~/.ssh to container. (Development only, potentially insecure)
Docker Secrets (Cross-platform, adds complexity)
Beyond these there's also the possibility of using a key-store running in a separate docker container accessible at runtime when using Compose. The drawback here is additional complexity due to the machinery required to create and manage a keystore such as Vault by HashiCorp.
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. If, however, you're running inside Compose and want to share a key to an app at runtime (reflecting practicalities of the OP) try this:
Create a docker-compose.env file and add it to your .gitignore file.
Update your docker-compose.yml and add env_file for service requiring the key.
Access public key from environment at application runtime, e.g. process.node.DEPLOYER_RSA_PUBKEY in the case of a Node.js application.
The above approach is ideal for development and testing and, while it could satisfy production requirements, in production you're better off using one of the other methods identified above.
Additional resources:
Docker Docs: Use bind mounts
Docker Docs: Manage sensitive data with Docker secrets
Stack Overflow: Using SSH keys inside docker container
Stack Overflow: Using ssh-agent with docker on macOS
If you don't care about the security of your SSH keys, there are many good answers here. If you do, the best answer I found was from a link in a comment above to this GitHub comment by diegocsandrim. So that others are more likely to see it, and just in case that repo ever goes away, here is an edited version of that answer:
Most solutions here end up leaving the private key in the image. This is bad, as anyone with access to the image has access to your private key. 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.
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.
In dockerfile we have a RUN command that do all these steps: use the pre-sing URL to get the ssh key, run npm install, and remove the ssh key.
By doing this in one single command the ssh key would not be stored in any layer, but the pre-sign URL will be stored, and this is not a problem because the URL will not be valid after 5 minutes.
The build script looks like:
# build.sh
aws s3 presign s3://my_bucket/my_key --expires-in 300 > ./pre_sign_url
docker build -t my-service .
Dockerfile looks like this:
FROM node
COPY . .
RUN eval "$(ssh-agent -s)" && \
wget -i ./pre_sign_url -q -O - > ./my_key && \
chmod 700 ./my_key && \
ssh-add ./my_key && \
ssh -o StrictHostKeyChecking=no git#github.com || true && \
npm install --production && \
rm ./my_key && \
rm -rf ~/.ssh/*
ENTRYPOINT ["npm", "run"]
CMD ["start"]
A simple and secure way to achieve this without saving your key in a Docker image layer, or going through ssh_agent gymnastics is:
As one of the steps in your Dockerfile, create a .ssh directory by adding:
RUN mkdir -p /root/.ssh
Below that indicate that you would like to mount the ssh directory as a volume:
VOLUME [ "/root/.ssh" ]
Ensure that your container's ssh_config knows where to find the public keys by adding this line:
RUN echo " IdentityFile /root/.ssh/id_rsa" >> /etc/ssh/ssh_config
Expose you local user's .ssh directory to the container at runtime:
docker run -v ~/.ssh:/root/.ssh -it image_name
Or in your dockerCompose.yml add this under the service's volume key:
- "~/.ssh:/root/.ssh"
Your final Dockerfile should contain something like:
FROM node:6.9.1
RUN mkdir -p /root/.ssh
RUN echo " IdentityFile /root/.ssh/id_rsa" >> /etc/ssh/ssh_config
VOLUME [ "/root/.ssh" ]
EXPOSE 3000
CMD [ "launch" ]
I put together a very simple solution that works for my use case where I use a "builder" docker image to build an executable that gets deployed separately. In other words my "builder" image never leaves my local machine and only needs access to private repos/dependencies during the build phase.
You do not need to change your Dockerfile for this solution.
When you run your container, mount your ~/.ssh directory (this avoids having to bake the keys directly into the image, but rather ensures they're only available to a single container instance for a short period of time during the build phase). In my case I have several build scripts that automate my deployment.
Inside my build-and-package.sh script I run the container like this:
# do some script stuff before
...
docker run --rm \
-v ~/.ssh:/root/.ssh \
-v "$workspace":/workspace \
-w /workspace builder \
bash -cl "./scripts/build-init.sh $executable"
...
# do some script stuff after (i.e. pull the built executable out of the workspace, etc.)
The build-init.sh script looks like this:
#!/bin/bash
set -eu
executable=$1
# start the ssh agent
eval $(ssh-agent) > /dev/null
# add the ssh key (ssh key should not have a passphrase)
ssh-add /root/.ssh/id_rsa
# execute the build command
swift build --product $executable -c release
So instead of executing the swift build command (or whatever build command is relevant to your environment) directly in the docker run command, we instead execute the build-init.sh script which starts the ssh-agent, then adds our ssh key to the agent, and finally executes our swift build command.
Note 1: For this to work you'll need to make sure your ssh key does not have a passphrase, otherwise the ssh-add /root/.ssh/id_rsa line will ask for a passphrase and interrupt the build script.
Note 2: Make sure you have the proper file permissions set on your script files so that they can be run.
Hopefully this provides a simple solution for others with a similar use case.
In later versions of docker (17.05) you can use multi stage builds. 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. But in my trials, I discovered that "docker cp" is for copying FROM a container to a host. Item 3 in the answer by creak seems to be saying you can use docker cp to inject files into a container. See https://docs.docker.com/engine/reference/commandline/cp/
excerpt
Copy files/folders from a container's filesystem to the host path.
Paths are relative to the root of the filesystem.
Usage: docker cp CONTAINER:PATH HOSTPATH
Copy files/folders from the PATH to the HOSTPATH
You can pass the authorised keys in to your container using a shared folder and set permissions using a docker file like this:
FROM ubuntu:16.04
RUN apt-get install -y openssh-server
RUN mkdir /var/run/sshd
EXPOSE 22
RUN cp /root/auth/id_rsa.pub /root/.ssh/authorized_keys
RUN rm -f /root/auth
RUN chmod 700 /root/.ssh
RUN chmod 400 /root/.ssh/authorized_keys
RUN chown root. /root/.ssh/authorized_keys
CMD /usr/sbin/sshd -D
And your docker run contains something like the following to share an auth directory on the host (holding the authorised_keys) with the container then open up the ssh port which will be accessable through port 7001 on the host.
-d -v /home/thatsme/dockerfiles/auth:/root/auth -–publish=127.0.0.1:7001:22
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.
Late to the party admittedly, how about this which will make your host operating system keys available to root inside the container, on the fly:
docker run -v ~/.ssh:/mnt -it my_image /bin/bash -c "ln -s /mnt /root/.ssh; ssh user#10.20.30.40"
I'm not in favour of using Dockerfile to install keys since iterations of your container may leave private keys behind.
You can use secrets to manage any sensitive data which a container
needs at runtime but you don’t want to store in the image or in source
control, such as:
Usernames and passwords
TLS certificates and keys
SSH keys
Other important data such as the name of a database or internal server
Generic strings or binary content (up to 500 kb in size)
https://docs.docker.com/engine/swarm/secrets/
I was trying to figure out how to add signing keys to a container to use during runtime (not build) and came across this question. Docker secrets seem to be the solution for my use case, and since nobody has mentioned it yet I'll add it.
In my case I had a problem with nodejs and 'npm i' from a remote repository. I fixed it added 'node' user to nodejs container and 700 to ~/.ssh in container.
Dockerfile:
USER node #added the part
COPY run.sh /usr/local/bin/
CMD ["run.sh"]
run.sh:
#!/bin/bash
chmod 700 -R ~/.ssh/; #added the part
docker-compose.yml:
nodejs:
build: ./nodejs/10/
container_name: nodejs
restart: always
ports:
- "3000:3000"
volumes:
- ../www/:/var/www/html/:delegated
- ./ssh:/home/node/.ssh #added the part
links:
- mailhog
networks:
- work-network
after that it started works
I'm setting up a git environment on Windows XP (msysGit 1.7.11, TortoiseGit 1.7.14) and trying to achieve following points :
ssh connection on a port different than default 22
ssh authentification handled by ssh-agent
So I create a ~/.ssh/config file :
Host gitbox
User gitolite
Hostname XX.XX.XX.XX
Port 154
PreferredAuthentications publickey
IdentityFile "/c/Documents and Settings/kraymer/.ssh/id_rsa"
When using the git bash CLI, everything works as intended.
I'm struggling with TortoiseGit.
I first installed TortoiseGit with Plink and using Pageant to load ssh private key. The automatic authentication (Pageant) worked but setup was a fail as TortoiseGit don't recognize git repos url formatted as gitolite#gitbox/repo.git.
I then decided to install TortoiseGit using openssh client, so the config file can be read by the ssh client, and to mimic the git CLI setup.
I picked the ssh.exe shipped with msys git as ssh client in TortoiseGit settings.
When doing a git pull, the remote url is now resolved but the passphrase password is asked while I expect ssh-agent automatic authentication to occur.
Is it possible to make TortoiseGit work with ssh-agent ?
Or make TortoiseGit (Plink) aware of .ssh/config ?
Edit #1
Following #VonC advice I configured my $HOME variable.
When I click Show environment variables in TortoiseGit I now have :
HOME=C:\Documents and Settings\kraymer
HOMEDRIVE=C:
HOMEPATH=\Documents and Settings\kraymer
But git pull still require I enter passphrase.
No tweaks needed.
Just make TortoiseGit point to the same ssh client used by git itself, see the screenshot:
This should be C:\Program Files\Git\usr\bin\ssh.exe in latest version of Git as mentioned by Aleksey Kontsevich in the comments.
I first installed TortoiseGit with Plink and using Pageant to load ssh private key. The automatic authentication (Pageant) worked but setup was a fail as TortoiseGit don't recognize git repos url formatted as gitolite#gitbox/repo.git.
I finally found a workaround which consist to create a PuTTY session with the same name that the ssh alias (ie gitbox in the question).
This way I can clone as git clone gitbox/monrepo in the CLI and the origin syntax is correctly handled by TortoiseGit.
Windows10 System
#TortoiseGit
In Network Section
From : C:\Program Files\TortoiseGit\bin\TortoiseGitPlink.exe
To : "C:\Users{user}\AppData\Local\Programs\Git\usr\bin\ssh.exe"
There seems to be a whole variety of options to solve this. As none of the above have worked for me, I tought I'd share what helped for me.
In Settings... -> Network -> SSH -> SSH client, set the client to C:\Program Files\TortoiseGit\bin\TortoiseGitPlink.exe. Using Pageant, you're then automatically authenticated as expected, otherwise you are prompted for your private key passphrase. Make sure the "Autoload Putty Key" option is checked in the push dialog.
Cygwin
Use approach described in the following article:
https://help.github.com/articles/working-with-ssh-key-passphrases
Password will be asked only once on the cygwin session startup.
!!! Before exiting cygwin session don't forget to kill ssh-agent process (use ps for find process PID and kill -9).
We are using separate approach for cygwin, because cygwin by some reason doesn't see processes started externally in windows environment.
2, 3) MsysGit, TortoiseGit
Useful link:
http://dogbiscuit.org/mdub/weblog/Tech/WindowsSshAgent
Install MsysGit.
Install TortoiseGit (check openssh instead of plink during installation).
!!! Check systems variables. If there is GIT_SSH variable present - remove it.
Go to TortoiseGit->Settings->General
Set Git exe Path to /bin
Set External dll path to /mingw/bin
Go to TortoiseGit->Settings->Network
Set SSH Client property to /bin/ssh.exe
Define system variable SSH_AUTH_SOCK=C:\temp.ssh-socket
Start cmd.exe and execute following commands(since we installed MsysGit all following commands are accessible in cmd - /bin is added to system PATH variable):
# following command is required to execute for avoiding Address already bind message when ssh-agen is not started yet but .ssh-socket exists after previous agent session
rm "%SSH_AUTH_SOCK%"
# Starting ssh-agent
ssh-agent -a "%SSH_AUTH_SOCK%"
# Adding our openssh key
ssh-add "%USERPROFILE%\.ssh\id_rsa"
# Type password for your key
That's it. From that moment you can execute git push, git pull from TortoiseGit and MsysGit without prompting passphrase.
When ssh-agent is no longer required you can kill it through windows task manager.
None of the above answers worked for me.
I created this batch file to solve the problem.
CALL "C:\Program Files\Git\cmd\start-ssh-agent.cmd"
SETX SSH_AUTH_SOCK "%SSH_AUTH_SOCK%"
SETX SSH_AGENT_PID "%SSH_AGENT_PID%"
Run this once, and enter your passphrase.
Then you can use tortoisegit with openssh without having to enter your passphrase for every operation.
Make sure to launch your TortoiseGit in an environment where HOME is defined, and reference the parent directory of .ssh.
This is important since, on Windows, HOME isn't defined by default.
See as an example: "Auth fails on Windows XP with git and tortoisegit".
(Other possible sources: "How to I tell Git for Windows where to find my private RSA key?")
Since the explanations here are a bit outdated, I decided to post my solution.
I am using Git Bash and TortoiseGit 2.8.0 in Windows 10, which are common nowadays.
I set ssh.exe as SSH client in Settings->Network as explained in previous posts.
I created a script with the following commands, as explained in a previous comment. You might also want to set a HOME environment variable, in case your system does not do it automatically. Assuming your home is in drive H:\ you can add the following lines:
SETX HOME /h
CALL "C:\Program Files\Git\cmd\start-ssh-agent.cmd"
SETX SSH_AUTH_SOCK "%SSH_AUTH_SOCK%"
SETX SSH_AGENT_PID "%SSH_AGENT_PID%"
I added the script using Win logo+R shell:startup to the startup folder. Alternatively, you can add the script to the registry to guarantee that it runs before other processes:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
Make sure to type exit to close the console and allow for the variable to be set for future processes.
If you use RSA keys in repositories, add at the end of the script as described above^
CALL "C:\Program Files\Git\cmd\start-ssh-agent.cmd"
...
"C:\Program Files\Git\usr\bin\ssh-add" ~/.ssh/myid.rsa
Works with Git 2.24.0, TortoiseGit 2.9.0, Windows 10 and no any Putty using.