SSH in Golang

package main
 
import (
   "bytes"
   "fmt"
   "io/ioutil"
   "log"
 
   "golang.org/x/crypto/ssh"
)
 
func main() {
 
   //There are different type of authentication method for SSh, 
   //username/password and publickey based auth. 
   // In this example you will see the publickey based authentication where password auth is setup with the remote server before hand. 
   //Below ling reads the ssh key to use for the authenticaion using ioutill readfile method
   key, err := ioutil.ReadFile("/Users/mymachine/.ssh/id_rsa")
   if err != nil {
       log.Fatalf("unable to read private key: %v", err)
   }
 
   // Create the Signer for this private key.
   signer, err := ssh.ParsePrivateKey(key)
   if err != nil {
       log.Fatalf("unable to parse private key: %v", err)
   }
 
   config := &ssh.ClientConfig{
       //user for the ssh
       User: "ubuntu",
       Auth: []ssh.AuthMethod{
           // Use the PublicKeys method for remote authentication.
           ssh.PublicKeys(signer),
       },

       //INSECURE use of HostKeyCallback below. if you would like to allow any host for ssh for the certverfication. 
       // here is actually comment from godoc
       //https://godoc.org/golang.org/x/crypto/ssh#HostKeyCallback
       HostKeyCallback: ssh.InsecureIgnoreHostKey(),
   }
   // Connect to the remote server and perform the SSH handshake.
   sshClient, err := ssh.Dial("tcp", "192.168.64.2:22", config)
   if err != nil {
       log.Fatalf("unable to connect: %v", err)
   }
   // Each ClientConn can support multiple interactive sessions,
   // represented by a Session. Create a new session to run a new command
   session, err := sshClient.NewSession()
   if err != nil {
       log.Fatal("Failed to create session: ", err)
   }
   // Once a Session is created, you can execute a single command on
   // the remote side using the Run method.
   var b bytes.Buffer
   session.Stdout = &b
   if err := session.Run("hostname"); err != nil {
       log.Fatal("Failed to run: " + err.Error())
   }
   fmt.Println(b.String())

 
 
}