python - 以交互式 ssh 模式在进程内调用多个命令

Question

这个问题已经有答案了:

Execute (sub)commands in secondary shell/command on SSH server in Python Paramiko (1 个回答)

Execute multiple commands in Paramiko so that commands are affected by their predecessors (2 个回答)

已关闭 3 年前。

我开始使用 paramiko 从计算机上的 python 脚本调用服务器上的命令。

我编写了以下代码:

from paramiko import client

class ssh:
    client = None

    def __init__(self, address, port, username="user", password="password"):
        # Let the user know we're connecting to the server
        print("Connecting to server.")
        # Create a new SSH client
        self.client = client.SSHClient()
        # The following line is required if you want the script to be able to access a server that's not yet in the known_hosts file
        self.client.set_missing_host_key_policy(client.AutoAddPolicy())
        # Make the connection
        self.client.connect(address, port, username=username, password=password, look_for_keys=False)

    def sendcommand(self, command):
        # Check if connection is made previously
        if self.client is not None:
            stdin, stdout, stderr = self.client.exec_command(command)
            while not stdout.channel.exit_status_ready():
                # Print stdout data when available
                if stdout.channel.recv_ready():
                    # Retrieve the first 1024 bytes
                    _data = stdout.channel.recv(1024)
                    while stdout.channel.recv_ready():
                        # Retrieve the next 1024 bytes
                        _data += stdout.channel.recv(1024)

                    # Print as string with utf8 encoding
                    print(str(_data, "utf8"))
        else:
            print("Connection not opened.")


    def closeconnection(self):
        if self.client is not None:
            self.client.close()

def main():
    connection = ssh('10.40.2.222', 2022 , "user" , "password")
    connection.sendcommand("cd /opt/process/bin/; ./process_cli; scm")    
    print("here")

    #connection.sendcommand("yes")
    #connection.sendcommand("nsgadmin")
    #connection.sendcommand("ls")

    connection.closeconnection()

if __name__ == '__main__':
    main()

现在，我发送到服务器(scm)的命令中的最后一个命令应该发送到我在服务器中运行的进程“process_cli”，并且应该打印该进程的输出(该进程从服务器 shell 的 stdin 获取输入，并将输出打印到服务器 shell 的 stdout)。
当我以交互模式运行时，一切正常，但是当我运行脚本时，我成功连接到我的服务器并在此服务器上运行所有基本 shell 命令(例如: ls 、 pwd 等)，但我无法运行任何命令在此服务器内运行的进程上。

如何解决这个问题？

Answer 1

SSH“exec” channel (由 SSHClient.exec_command 使用)在单独的 shell 中执行每个命令。结果是:

1. cd/opt/process/bin/ 对 ./process_cli 没有任何影响。
2. scm 将作为 shell 命令执行，而不是作为 process_cli 的子命令。

您需要:

1. 将 cd 和 process_cli 作为一个命令执行(在同一 shell 中):

   stdin, stdout, stderr = client.exec_command('cd /opt/process/bin/ && ./process_cli') 
   

   或

   stdin, stdout, stderr = client.exec_command('/opt/process/bin/process_cli') 
   

2. 将 process_cli 的(子)命令提供给其标准输入:

   stdin.write('scm\n')
   stdin.flush()
   

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• Execute multiple commands in Paramiko so that commands are affected by their predecessors
• Execute (sub)commands in secondary shell/command on SSH server in Paramiko