Add your ssh key into the `authorized_keys` of CoreOS

README.md

On your machine (windows / linux) that you want to get access to from

Setup a (temporary) http server on your machine that always responds with your machine's SSH public key.

Replace the 'YOUR-SSH-KEY-GOES-HERE' if using the golang file of this gist.

On the CoreOS box you want to access

Call these commands below on the CoreOS box by replacing IP-OF-YOUR-MACHINE of your machine having the http server.

curl http://[IP-OF-YOUR-MACHINE]:8888 > ~/.ssh/authorized_keys
chmod 600 ~/.ssh/authorized_keys

Note that I chose port 8888 in the golang file but it could be changed there and then also adapted in the curl command from CoreOS.

SSH into CoreOS

Now you should be able to connect if you know the ip. Hint: ip addr show to show IPs.

main.go

// Golang example of http server

package main

import (
	"fmt"
	"net/http"
)

const YOUR_SSH_KEY = `YOUR-SSH-KEY-GOES-HERE`

func main() {
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		// Now write the ssh key
		fmt.Fprintf(w, "%s", string(YOUR_SSH_KEY))
	})

	portStr := "8888"
	fmt.Println("Attempting to listen on port " + portStr)
	err := http.ListenAndServe(":"+portStr, nil)
	if err != nil {
		fmt.Println("ERROR: Unable to start http server")
	}
}