sshclient.go

package main

import (
    "io/ioutil"
    "log"

    "golang.org/x/crypto/ssh"
)

func main() {
    ip := "xx.xx.xx.xx"
    port := "22"
    user := "username"

    buf, err := ioutil.ReadFile("/path/to/keyfile")
    if err != nil {
        panic(err)
    }

    key, err := ssh.ParsePrivateKey(buf)
    if err != nil {
        panic(err)
    }

    config := &ssh.ClientConfig{
        User: user,
        Auth: []ssh.AuthMethod{
            ssh.PublicKeys(key),
        },
        HostKeyCallback: ssh.InsecureIgnoreHostKey(),
    }

    conn, err := ssh.Dial("tcp", ip+":"+port, config)
    if err != nil {
        log.Println(err)
    }
    defer conn.Close()

    sessions, err := conn.NewSession()
    if err != nil {
        log.Println(err)
    }
    defer sessions.Close()

    sessions.Run("echo -n > empty.txt")

}