├── .dockerignore ├── Dockerfile ├── LICENSE ├── README.md ├── codefresh.yaml └── rdocker.sh /.dockerignore: -------------------------------------------------------------------------------- 1 | .git 2 | -------------------------------------------------------------------------------- /Dockerfile: -------------------------------------------------------------------------------- 1 | FROM alpine:3.5 2 | 3 | MAINTAINER Alexei Ledenev 4 | 5 | # default Docker API version: override to work with older docker server 6 | ENV DOCKER_API_VERSION 1.26 7 | # default docker client version 8 | ENV DOCKER_VERSION 1.13.1 9 | 10 | # add some packages 11 | RUN apk --no-cache add curl bash openssl openssh-client python 12 | 13 | # install docker client 14 | RUN curl -o "/tmp/docker-${DOCKER_VERSION}.tgz" -LS "https://get.docker.com/builds/Linux/x86_64/docker-${DOCKER_VERSION}.tgz" && \ 15 | curl -o "/tmp/docker-${DOCKER_VERSION}.tgz.sha256" -LS "https://get.docker.com/builds/Linux/x86_64/docker-${DOCKER_VERSION}.tgz.sha256" && \ 16 | cd /tmp && sha256sum -c "docker-${DOCKER_VERSION}.tgz.sha256" && \ 17 | tar -xvzf "/tmp/docker-${DOCKER_VERSION}.tgz" -C /tmp/ && \ 18 | chmod u+x /tmp/docker/docker && mv /tmp/docker/docker /usr/bin/ && \ 19 | rm -rf /tmp/* 20 | 21 | # install rdocker script 22 | COPY rdocker.sh /usr/local/bin/rdocker 23 | RUN chmod +x /usr/local/bin/rdocker 24 | 25 | CMD ["rdocker"] 26 | 27 | # labels for https://microbadger.com/ service 28 | ARG GH_SHA 29 | LABEL org.label-schema.vcs-ref=$GH_SHA \ 30 | org.label-schema.vcs-url="https://github.com/codefresh-io/remote-docker" -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright {yyyy} {name of copyright owner} 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # remote-docker 2 | 3 | #### Build 4 | [![Codefresh build status]( https://g.codefresh.io/api/badges/build?repoOwner=codefresh-io&repoName=remote-docker&branch=master&pipelineName=remote-docker&accountName=codefresh-inc&type=cf-2)]( https://g.codefresh.io/repositories/codefresh-io/remote-docker/builds?filter=trigger:build;branch:master;service:58b405b7a6eaef0100345945~remote-docker) 5 | 6 | #### Image 7 | [![](https://images.microbadger.com/badges/image/codefresh/remote-docker.svg)](http://microbadger.com/images/codefresh/remote-docker) [![](https://images.microbadger.com/badges/version/codefresh/remote-docker.svg)](http://microbadger.com/images/codefresh/remote-docker) [![](https://images.microbadger.com/badges/commit/codefresh/remote-docker.svg)](http://microbadger.com/images/codefresh/remote-docker) 8 | 9 | A Docker container to securely control a remote docker daemon CLI using ssh forwarding, no SSL setup needed. 10 | 11 | ## Setup 12 | 13 | In order to use `remote-docker` with your Docker server, you need to configure SSH-key based authentication for your Docker server machine. There are lots of tutorials available: you can use [this](https://www.digitalocean.com/community/tutorials/how-to-configure-ssh-key-based-authentication-on-a-linux-server) for example. 14 | 15 | You should add you SSH public key to your Docker server and keep private key for using in `remote-docker` container. You can pass this key either as file (using `-v` option) or as environment variable (`-e SSH_KEY=...`). 16 | 17 | From now on, you should be able to run any `docker` command on your server through SSH tunneling. 18 | 19 | ## Usage 20 | 21 | Lets assume you want to control the docker daemon on your `webserver.com` server. You need to run a `codefresh/remote-docker` Docker container, passing `ssh` private key file to it, like this: 22 | 23 | $ docker run -it --rm -v ${HOME}/.ssh/id_rdocker:/root/.ssh/id_rdocker codefresh/remote-docker rdocker user@webserver.com 24 | 25 | Or you can pass `ssh` key as the environment variable (assuming you've setup `SSH_KEY`) 26 | 27 | $ docker run -it --rm -e SSH-KEY=${SSH_KEY} codefresh/remote-docker rdocker user@webserver.com 28 | 29 | This will open a new `bash` session, within the `codefresh/remote-docker` container, with a new `DOCKER_HOST` variable setup. Any `docker` command you execute will take place on the remote docker daemon. 30 | To test the connection run: 31 | 32 | docker:user@webserver.com bash-4.3# docker info 33 | 34 | Check the `Name:` field it should have the remote hostname .... That's it!!! 35 | 36 | You could for example run `docker build` to build an image on the remote host and then `docker save -o myimage.tar image_name` to store it locally. 37 | Or run `docker exec -it container_name bash` to open a shell session on a remote container. Even bash auto-completion works ok. 38 | 39 | To stop controlling the remote daemon and close the ssh forwarding, just exit the newly created bash session (press `Ctrl+D`). 40 | 41 | You can also execute any `docker` command directly, without openning a `bash` shell in the `codefresh/remote-docker` container. 42 | 43 | $ docker run -it --rm -v ${HOME}/.ssh/id_rdocker:/root/.ssh/id_rdocker codefresh/remote-docker rdocker user@webserver.com docker info 44 | 45 | ### Custom SSH port 46 | 47 | Redefine `SSH_PORT` environment variable if you are using a different port than `22` (set by default). 48 | 49 | ## Used software 50 | 51 | - Copy of `rdocker.sh` script (MIT license) from (dvddarias/rdocker)[https://github.com/dvddarias/rdocker] 52 | -------------------------------------------------------------------------------- /codefresh.yaml: -------------------------------------------------------------------------------- 1 | version: '1.0' 2 | 3 | steps: 4 | 5 | build_image: 6 | type: build 7 | title: Build remote-docker image 8 | dockerfile: Dockerfile 9 | working-directory: ${{main_clone}} 10 | image-name: codefresh/remote-docker 11 | build_arguments: 12 | - GH_SHA=${{CF_REVISION}} 13 | 14 | push_to_registry: 15 | type: push 16 | title: Pushing master to DockerHub 17 | candidate: '${{build_image}}' 18 | tag: 'latest' 19 | when: 20 | branch: 21 | only: 22 | - master 23 | 24 | tag_branch_registry: 25 | type: push 26 | title: Pushing ${{CF_BRANCH}} to DockerHub 27 | candidate: '${{build_image}}' 28 | tag: ${{CF_BRANCH}} -------------------------------------------------------------------------------- /rdocker.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | set -e 3 | 4 | # use ssh port; allow to override 5 | SSH_PORT=${SSH_PORT:-22} 6 | # use Python as Docker image by default 7 | PYTHON_DOCKER=${PYTHON_DOCKER:-true} 8 | 9 | re='^[0-9]+$' 10 | if [[ $# -eq 0 || $1 == "-h" || $1 == "-help" ]]; then 11 | echo "Usage: rdocker [-h|-help] [user@]hostname [port] [cmd]" 12 | echo "" 13 | echo " -h -help print this message" 14 | echo " user@hostname ssh remote login address" 15 | echo " port local port used to forward the remote docker daemon, if not present a free random port will be used" 16 | echo " cmd when provided, it is the only command run on the remote host (no bash session is created)" 17 | echo " SSH_PORT set ssh port through environment variable (default: 22)" 18 | exit 19 | fi 20 | 21 | # use SSH_KEY environment variable to create key file, if not exists 22 | ssh_key_file="$HOME/.ssh/id_rdocker" 23 | if [[ ! -f "$ssh_key_file" ]]; then 24 | if [[ ! -z "${SSH_KEY}" ]]; then 25 | echo "SSH key passed through SSH_KEY environment variable: lenght check ${#SSH_KEY}" 26 | mkdir -p ~/.ssh 27 | if [[ ! -z "${SPLIT_CHAR}" ]]; then 28 | echo "${SSH_KEY}" | tr \'"${SPLIT_CHAR}"\' '\n' > "$ssh_key_file" 29 | else 30 | echo "${SSH_KEY}" > "$ssh_key_file" 31 | fi 32 | chmod 600 "$ssh_key_file" 33 | fi 34 | else 35 | echo "Found $ssh_key_file file" 36 | fi 37 | 38 | #Extracting parameters 39 | remote_host=${1} 40 | if [[ $2 =~ $re ]]; then 41 | local_port=${2} 42 | command=${*:3} #third parameter and beyond 43 | else 44 | command=${*:2} #second parameter and beyond 45 | fi 46 | control_path="$HOME/.rdocker-master-$(date +%s%N)" 47 | 48 | ssh "${remote_host}" -p ${SSH_PORT} -i "$ssh_key_file" -nNf -o "StrictHostKeyChecking no" -o ControlMaster=yes -o ControlPath="${control_path}" -o ControlPersist=yes 49 | 50 | if [ ! -S "${control_path}" ]; then 51 | exit 52 | fi 53 | 54 | find_port_code="import socket;s=socket.socket(socket.AF_INET, socket.SOCK_STREAM);s.bind(('', 0));print(s.getsockname()[1]);s.close()" 55 | 56 | remote_port=$(ssh "${remote_host}" -p ${SSH_PORT} -i "$ssh_key_file" -o ControlPath="${control_path}" python -c \"$find_port_code\") 57 | 58 | if [ -z "$remote_port" ]; then 59 | echo "ERROR: Failed to find a free port. This usually happens when python is not installed on the remote host." 60 | #clear the ssh control connection 61 | ssh -O exit -o ControlPath="$control_path" "$remote_host" -p ${SSH_PORT} "" 2> /dev/null 62 | rm -f "$control_path" 63 | exit 1 64 | fi 65 | 66 | success_msg="Connection established" 67 | forwarder=" 68 | import threading,socket,select,signal,sys,os 69 | running = True 70 | remote_port = $remote_port 71 | def signal_handler(signal, frame): 72 | global running 73 | running = False 74 | sys.exit(0) 75 | 76 | signal.signal(signal.SIGINT, signal_handler) 77 | signal.signal(signal.SIGTERM, signal_handler) 78 | 79 | def main(): 80 | global running 81 | addr = (\"localhost\", remote_port) 82 | server = socket.socket() 83 | server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) 84 | try: 85 | server.bind(addr) 86 | server.listen(50) 87 | except socket.error as msg: 88 | server.close() 89 | print(\"Port \" + remote_port + \" is already in use.\") 90 | sys.exit(0) 91 | print(\"${success_msg}.\") 92 | rlist = [server] 93 | while running: 94 | readable, writable, exceptional = select.select(rlist, [], [], 0.5) 95 | if os.getppid() == 1: 96 | running=False 97 | break 98 | if server in readable: 99 | client, connection = server.accept() 100 | threading.Thread(target=serve_client, args=(client,)).start() 101 | 102 | server.shutdown(socket.SHUT_RDWR) 103 | server.close() 104 | 105 | def serve_client(tcp_socket): 106 | global running 107 | uds_socket = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) 108 | try: 109 | uds_socket.connect(\"/var/run/docker.sock\") 110 | except socket.error as msg: 111 | uds_socket.close() 112 | tcp_socket.close() 113 | return 114 | 115 | rlist = [tcp_socket, uds_socket] 116 | while running: 117 | readable, writable, exceptional = select.select(rlist, [], [], 0.5) 118 | 119 | if tcp_socket in readable: 120 | data = tcp_socket.recv(4096) 121 | if not data or not running: break 122 | else: 123 | uds_socket.sendall(data) 124 | 125 | if uds_socket in readable: 126 | data = uds_socket.recv(4096) 127 | if not data or not running: break 128 | else: 129 | tcp_socket.sendall(data) 130 | 131 | tcp_socket.shutdown(socket.SHUT_RDWR) 132 | tcp_socket.close() 133 | uds_socket.shutdown(socket.SHUT_RDWR) 134 | uds_socket.close() 135 | 136 | if __name__ == \"__main__\": 137 | main() 138 | " 139 | 140 | # find an unused local port 141 | # create a temporary named pipe and attach it to file descriptor 3 142 | PIPE=$(mktemp -u); mkfifo "$PIPE" 143 | exec 3<>"$PIPE"; rm "$PIPE" 144 | # find a free port or use the provided one 145 | local_port=${local_port:-$(python -c "$find_port_code")} 146 | 147 | if [[ "$(ssh -i "$ssh_key_file" "$remote_host" -p ${SSH_PORT} "docker ps | grep remote_python")" ]]; then 148 | ssh -i "$ssh_key_file" "$remote_host" -p ${SSH_PORT} "docker rm -f remote_python" || true 149 | fi 150 | 151 | remote_script_path="/tmp/rdocker-forwarder.py" 152 | remote_python="python" 153 | if [[ "$PYTHON_DOCKER" == true ]]; then 154 | remote_python="docker run -i --name remote_python --rm --network=host -v /tmp:/tmp -v /var/run/docker.sock:/var/run/docker.sock frolvlad/alpine-python2 python" 155 | fi 156 | 157 | 158 | printf "%s" "$forwarder" | ssh -i "$ssh_key_file" "$remote_host" -p ${SSH_PORT} -o ControlPath="$control_path" -L "$local_port:localhost:$remote_port" "cat > ${remote_script_path}""; exec ${remote_python} -u ${remote_script_path}" 1>&3 & 159 | CONNECTION_PID=$! 160 | # wait for it's output 161 | read -r -u 3 -d . line 162 | exec 3>&- 163 | 164 | if [[ "$line" == "$success_msg" ]]; then 165 | export DOCKER_HOST="tcp://localhost:${local_port}" 166 | 167 | if [[ -n "$command" ]]; then 168 | bash -c "$command" 169 | exit_status=$? 170 | kill -15 $CONNECTION_PID 171 | #clear the ssh control connection 172 | if [[ "$PYTHON_DOCKER" == true ]]; then 173 | ssh -i "$ssh_key_file" "$remote_host" -p ${SSH_PORT} "docker rm -f remote_python" 1>& 2> /dev/null 174 | fi 175 | ssh -O exit -o ControlPath="$control_path" "$remote_host" -p ${SSH_PORT} "" 2> /dev/null 176 | rm -f "$control_path" 177 | #exit with the same status as the command 178 | exit $exit_status 179 | else 180 | COLOR='\033[0;33m' 181 | NC='\033[0m' 182 | RED='\033[1;31m' 183 | 184 | echo -e "Local docker client connected to ${COLOR}${remote_host}${NC} docker daemon." 185 | echo "Route: localhost:${local_port} -> ${remote_host}:${remote_port}" 186 | echo -e "Press ${RED}Ctrl+D${NC} to stop forwarding and exit the bash session." 187 | export PROMPT_COMMAND="echo -en \"${COLOR}docker:${remote_host}${NC} \"" 188 | bash 189 | fi 190 | 191 | kill -15 $CONNECTION_PID 192 | echo -e "Disconnected from ${COLOR}$remote_host${NC} docker daemon." 193 | else 194 | echo "$line" 195 | fi 196 | 197 | #clear the ssh control connection 198 | if [[ "$PYTHON_DOCKER" == true ]]; then 199 | ssh -i "$ssh_key_file" "$remote_host" -p ${SSH_PORT} "docker rm -f remote_python" 1>& 2> /dev/null 200 | fi 201 | ssh -O exit -o ControlPath="$control_path" "$remote_host" -p ${SSH_PORT} "" 2> /dev/null 202 | rm -f "$control_path" 203 | --------------------------------------------------------------------------------