如何在golang CLI中的远程计算机上执行命令？

Question

How do I execute a command on a remote machine in a golang CLI? I need to write a golang CLI that can SSH into a remote machine via a key and execute a shell command. Furthermore, I need to be able to do this one hop away. e.g. SSH into a machine (like a cloud bastion) and then SSH into another, internal, machine and execute a shell command.

I haven't (yet) found any examples for this.

Answer 1

Try with os/exec https://golang.org/pkg/os/exec/ to execute a ssh

package main

import (
    "bytes"
    "log"
    "os/exec"
)

func main() {
    cmd := exec.Command("ssh", "remote-machine", "bash-command")
    var out bytes.Buffer
    cmd.Stdout = &out
    err := cmd.Run()
    if err != nil {
        log.Fatal(err)
    }
}

To jump over machines use the ProxyCommand directive in a ssh config file.

Host remote_machine_name
  ProxyCommand ssh -q bastion nc remote_machine_ip 22