paramiko.ssh_exception.SSHException: No hostkey for host [] found.

sftpretty

A pretty quick and simple interface to paramiko SFTP. Provides multi-threaded routines with progress notifications for reliable, asynchronous transfers. A Python3 optimized fork of pysftp with additional features & improvements.

Built-in retry decorator
Hash function for integrity checking
Improved local & remote directory mapping
Improved logging mechanism
More tests
Multi-threaded directory transfers
OpenSSH config file support
Progress notifications
Support for ciphers, compression, digests, kex & key type options
Support for disabled algorithms
Support for ED25519 & ECDSA keys
Support for private key passwords
Thread-safe connection manager
Transfer Resumption

Example

from sftpretty import CnOpts, Connection


# Basic

with Connection('hostname', username='me', password='secret') as sftp:
    # Temporarily chdir to public/.
    with sftp.cd('public'):
        # Upload file to public/ on remote.
        sftp.put('/my/local/filename')
        # Download a remote file from public/.
        sftp.get('remote_file')


with Connection('hostname', private_key='~/.ssh/id_ed25519',
                private_key_pass='secret') as sftp:
    # Upload local directory to remote_directory.
    sftp.put_d('/my/local', '/remote_directory')

    # Recursively download a remote_directory and save it to /tmp locally.
    sftp.get_r('remote_directory', '/tmp')


# Advanced

# Use password authentication
with Connection('hostname', username='me', password='secret') as sftp:
    # Upload local directory to remote_directory. On occurance of any
    # exception or child of, passed in the tuple, retry the operation.
    # Between each attempt increment a pause equal to backoff * delay.
    # Run a total of tries (six) times including the first attempt.
    sftp.put_d('/my/local', '/remote_directory', backoff=2, delay=1,
               exceptions=(NoValidConnectionsError, socket.timeout,
                           SSHException), tries=6)


# Use public key authentication
with Connection('hostname', private_key='~/.ssh/id_ed25519') as sftp:
    # Resume the download of a bigfile and save it to /mnt locally.
    sftp.get('bigfile', '/mnt', preserve_mtime=True, resume=True)


# Use public key authentication with optional private key password
with Connection('hostname', private_key='~/.ssh/id_ed25519',
                private_key_pass='secret') as sftp:
    # Recursively download a remote_directory and save it to /tmp locally.
    # Don't confirm files, useful in a scenario where the server removes
    # the remote file immediately after download. Preserve remote mtime on
    # local copy. Limit the thread pool connections to the server.
    sftp.get_r('remote_directory', '/tmp', confirm=False,
               preserve_mtime=True, workers=6)


# Use OpenSSH config for public key authentication. Configuration
# connection values are prioritized when available. Credentials still need
# to be provided. There may be a significant delta between your ssh program
# and support for newer security option algorithms due to lagging support
# in paramiko.
cnopts = CnOpts(config='~/.ssh/config', knownhosts='server.pub')
with Connection('alias', cnopts=cnopts, private_key_pass='secret') as sftp:
    # Rename existing file on remote server
    sftp.rename('/remote/old_name', '/remote/new_name')


# Pass custom host key file for verification 
cnopts = CnOpts(knownhosts='sftpserver.pub')
# Use connection options to set preferred encryption standards
cnopts.ciphers= ('aes256-ctr', 'aes128-ctr')
cnopts.digests = ('hmac-sha2-512', 'hmac-sha2-256')
cnopts.kex = ('ecdh-sha2-nistp521', 'ecdh-sha2-nistp384')
cnopts.key_types = ('ssh-ed25519', 'ecdsa-sha2-nistp521')
# Turn on verbose logging and set custom log file
cnopts.log = '/var/log/backups/daily.log'
cnopts.log_level = 'debug'
# Pass options object directly to connection object
with Connection('hostname', cnopts=cnopts, private_key='~/.ssh/id_backup',
                private_key_pass='secret') as sftp:
    # Aggressively retry important operation
    sftp.put_r('/local_backup', '/remote_backup', backoff=2, delay=1,
               exceptions=socket.timeout, preserve_mtime=True, tries=11)

Additional Information

Project: https://github.com/byteskeptical/sftpretty
Download: https://pypi.python.org/pypi/sftpretty
Documentation: https://docs.sftpretty.com
License: BSD

Requirements

paramiko >= 1.17.0

Supports

Tested on Python 3.6, 3.7, 3.8, 3.9, 3.10, 3.11

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