Using Docker on remote Docker Host with docker context

README.md

Working on remote Docker Host using docker context

SSH keys on Windows

In order to use remote Docker host, as a prerequisite you need SSH enabled (required login using SSH keys).

Generate or find your public SSH key

Go to C:\Users\YOUR_USERNAME\.ssh and copy content of id_rsa.pub file

If the file does not exist, generate the SSH key-pair using following command

ssh-keygen -t rsa -b 4096

Setting up SSH keys to remote machine

Copying your public ssh key to machine

You can use password-based authentication to get into linux machine for the first time, and then use the following command:

echo your_public_ssh_key >> ~/.ssh/authorized_keys

Adding permissions

chmod 700 ~/.ssh
chmod 600 ~/.ssh/authorized_keys

Docker Context setup

Set a docker context

with:

docker context create workshop-vm --docker host=ssh://user@host

Switch to context:

docker context use workshop-vm

Issue commands as you normally would...

I have this error and I can't figure it what wrong

docker ps
error during connect: Get "http://docker.example.com/v1.24/containers/json": command [ssh -o ConnectTimeout=30 -l root -p 2376 -- 192.168.49.136 docker system dial-stdio] has exited with exit status 255, please make sure the URL is valid, and Docker 18.09 or later is installed on the remote host: stderr=banner exchange: Connection to UNKNOWN port -1: Connection refused

most likely, it is just trying for you to confirm the host is part of the known hosts.
if you try running ssh whateveruser@whateveraddress it will prompt for your input. tell ssh you trust the host, and try again with docker ps