如何在 golang CLI 中在遠程機器上執行命令？我需要編寫一個 golang CLI，它可以通過密鑰 SSH 到遠程機器并執行 shell 命令。此外，我需要能夠做到這一點。例如，通過 SSH 連接到一臺機器（如云堡壘），然后通過 SSH 連接到另一臺內部機器并執行 shell 命令。我（還）沒有找到任何例子。
3 回答
開滿天機
TA貢獻1786條經驗 獲得超13個贊
"golang.org/x/crypto/ssh"您可以使用該軟件包通過 SSH 在遠程計算機上運行命令。
這是一個示例函數，演示了在遠程機器上運行單個命令并返回輸出的簡單用法：
//e.g. output, err := remoteRun("root", "MY_IP", "PRIVATE_KEY", "ls")
func remoteRun(user string, addr string, privateKey string, cmd string) (string, error) {
// privateKey could be read from a file, or retrieved from another storage
// source, such as the Secret Service / GNOME Keyring
key, err := ssh.ParsePrivateKey([]byte(privateKey))
if err != nil {
return "", err
}
// Authentication
config := &ssh.ClientConfig{
User: user,
// https://github.com/golang/go/issues/19767
// as clientConfig is non-permissive by default
// you can set ssh.InsercureIgnoreHostKey to allow any host
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
Auth: []ssh.AuthMethod{
ssh.PublicKeys(key),
},
//alternatively, you could use a password
/*
Auth: []ssh.AuthMethod{
ssh.Password("PASSWORD"),
},
*/
}
// Connect
client, err := ssh.Dial("tcp", net.JoinHostPort(addr, "22"), config)
if err != nil {
return "", err
}
// Create a session. It is one session per command.
session, err := client.NewSession()
if err != nil {
return "", err
}
defer session.Close()
var b bytes.Buffer // import "bytes"
session.Stdout = &b // get output
// you can also pass what gets input to the stdin, allowing you to pipe
// content from client to server
// session.Stdin = bytes.NewBufferString("My input")
// Finally, run the command
err = session.Run(cmd)
return b.String(), err
}
青春有我
TA貢獻1784條經驗 獲得超8個贊
嘗試使用 os/exec https://golang.org/pkg/os/exec/來執行 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)
}
}
要跳過機器，請使用 ssh 配置文件中的 ProxyCommand 指令。
Host remote_machine_name
ProxyCommand ssh -q bastion nc remote_machine_ip 22
UYOU
TA貢獻1878條經驗 獲得超4個贊
這里的其他解決方案也可以，但我會拋出另一個你可以嘗試的選項：simplessh。我認為它更容易使用。對于這個問題，我將使用下面的選項 3，您可以在其中使用您的密鑰進行 ssh。
選項 1：使用密碼 SSH 到機器，然后運行命令
import (
"log"
"github.com/sfreiberg/simplessh"
)
func main() error {
var client *simplessh.Client
var err error
if client, err = simplessh.ConnectWithPassword("hostname_to_ssh_to", "username", "password"); err != nil {
return err
}
defer client.Close()
// Now run the commands on the remote machine:
if _, err := client.Exec("cat /tmp/somefile"); err != nil {
log.Println(err)
}
return nil
}
選項 2：使用一組可能的密碼通過 SSH 連接到機器，然后運行命令
import (
"log"
"github.com/sfreiberg/simplessh"
)
type access struct {
login string
password string
}
var loginAccess []access
func init() {
// Initialize all password to try
loginAccess = append(loginAccess, access{"root", "rootpassword1"})
loginAccess = append(loginAccess, access{"someuser", "newpassword"})
}
func main() error {
var client *simplessh.Client
var err error
// Try to connect with first password, then tried second else fails gracefully
for _, credentials := range loginAccess {
if client, err = simplessh.ConnectWithPassword("hostname_to_ssh_to", credentials.login, credentials.password); err == nil {
break
}
}
if err != nil {
return err
}
defer client.Close()
// Now run the commands on the remote machine:
if _, err := client.Exec("cat /tmp/somefile"); err != nil {
log.Println(err)
}
return nil
}
選項 3：使用您的密鑰通過 SSH 連接到機器
import (
"log"
"github.com/sfreiberg/simplessh"
)
func SshAndRunCommand() error {
var client *simplessh.Client
var err error
// Option A: Using a specific private key path:
//if client, err = simplessh.ConnectWithKeyFile("hostname_to_ssh_to", "username", "/home/user/.ssh/id_rsa"); err != nil {
// Option B: Using your default private key at $HOME/.ssh/id_rsa:
//if client, err = simplessh.ConnectWithKeyFile("hostname_to_ssh_to", "username"); err != nil {
// Option C: Use the current user to ssh and the default private key file:
if client, err = simplessh.ConnectWithKeyFile("hostname_to_ssh_to"); err != nil {
return err
}
defer client.Close()
// Now run the commands on the remote machine:
if _, err := client.Exec("cat /tmp/somefile"); err != nil {
log.Println(err)
}
return nil
}
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