First, the first application of this module

SSH client

Here is a simple code to understand

import paramiko

# Instantiate an ssh client object
ssh = paramiko.SSHClient()

# Automatically add the machine you want to connect to in know_host, ignore this verification, and pay attention to the passed parameter paramiko.AutoAddPolicy()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())

# Connection information
ssh.connect(hostname='hostadresss', port=22, username='root', password='password')

# Transfer command. There are three return values. The first is the standard input, that is, the command you input. The second is the standard output, that is, the command return value
# The third standard error will be returned to this value when an error is reported. At the same time, the return value is not fixed, but also an error when it changes
stdin, stdout, stderr = ssh.exec_command('pwd')

# Read output
result = stdout.read()

# Printout
print(result)

# Close client
ssh.close()

Note that there are three return values when connecting and sending commands

The second version uses the private key to log in (multiple functions)

import paramiko

# Declare private key file path
private_key = paramiko.RSAKey.from_private_key_file('id_rsa')

# Generate ssh client instance
ssh = paramiko.SSHClient()

# Authentication by public means (does not need to exist in the known hosts file)
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())

# Connection server declaration private key
ssh.connect(hostname='45.32.131.167', port=22, username='root', pkey=private_key)

# Get return value
stdin, stdout, stderr = ssh.exec_command('pwd')

# read
result = stdout.read()

# Printing
print(result)

# Closing instance
ssh.close()

Do not forget to configure the ssh on the server side before use, and allow the key to log in

And then there's the second application

SFTP Client

import paramiko

# Generate Transport instance incoming ip and port
transport = paramiko.Transport(('hostname', 22))

# Incoming username password connection
transport.connect(username='root', password='123')

# Generate the SFTPClient instance and pass it to the above connected instance
sftp = paramiko.SFTPClient.from_transport(transport)

# Upload files
sftp.put('put_file_path', 'server_path')

# Download File
sftp.get('download_file_path', 'local_path')

# Closing instance
transport.close()

Note that the SFTP instance is not created in one step

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