How to Automate SSH Command Execution with Python Using Paramiko?

SSH Command Execution with Python

Performing remote commands via SSH from within Python scripts can enhance automated tasks. One method to achieve this is by leveraging the capabilities of the paramiko module.

Question: The script requires the ability to execute commands on a remote server while using a known password. How can this be automated in Python without merely invoking the ssh command with the username and remote host?

Answer:

To establish an SSH connection and execute commands remotely in Python with paramiko, follow these steps:

1. Import the paramiko Module: import paramiko
2. Create an SSHClient Instance: ssh = paramiko.SSHClient()
3. Connect to the Remote Server: ssh.connect(server, username=username, password=password)

4. Execute Commands:

   • ssh_stdin, ssh_stdout, ssh_stderr = ssh.exec_command(cmd_to_execute)
   • This returns a tuple containing handles to the stdin, stdout, and stderr streams.

5. Process the Command Output:

   • stdout.read() will display the command's output.

6. For SSH Key Authentication:

   • k = paramiko.RSAKey.from_private_key_file(keyfilename) or k = paramiko.DSSKey.from_private_key_file(keyfilename)
   • ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
   • ssh.connect(hostname=host, username=user, pkey=k)

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