If you get no output on stdout, it is usually because the command fails to start. Read stderr to check for any errors. print(stderr.readlines()) Quite often the error is “<command> not found”. For that see Some Unix commands fail with “<command> not found”, when executed using Python Paramiko exec_command If you are connecting to a … Read more
Calling SFTPFile.prefetch should increase the read speed: ncfile = sftp_client.open(‘mynetCDFfile’) ncfile.prefetch() b_ncfile = ncfile.read() Another option is enabling read buffering, using bufsize parameter of SFTPClient.open: ncfile = sftp_client.open(‘mynetCDFfile’, bufsize=32768) b_ncfile = ncfile.read() (32768 is a value of SFTPFile.MAX_REQUEST_SIZE) Similarly for writes/uploads: Writing to a file on SFTP server opened using pysftp “open” method is slow. … Read more
The difference is that invoke_shell uses SSH shell channel, while exec_command uses SSH exec channel. What that really means to you as a user/developer really depends on the SSH server, not on Paramiko itself. In common *nix OpenSSH server: The shell channel executes a login shell (as if you login with SSH terminal client). The … Read more
If the SSHClient.exec_command does not work, the first thing to test is to try (on one line): ssh user@host command That will use the same SSH API (the “exec” channel) as SSHClient.exec_command. If you are on Windows, you can use plink (from PuTTY packages) instead of ssh. If ssh/plink fails too, it indicates that your … Read more
The full paramiko distribution ships with a lot of good demos. In the demos subdirectory, demo.py and interactive.py have full interactive TTY examples which would probably be overkill for your situation. In your example above ssh_stdin acts like a standard Python file object, so ssh_stdin.write should work so long as the channel is still open. … Read more
Try the following edited code, it should work: #!/usr/bin/python # # Paramiko # import paramiko import sys import subprocess # # we instantiate a new object referencing paramiko’s SSHClient class # vm = paramiko.SSHClient() vm.set_missing_host_key_policy(paramiko.AutoAddPolicy()) vm.connect(‘192.168.115.103′, username=”osmanl”, password=’xxxxxx’) # vmtransport = vm.get_transport() dest_addr = (‘10.103.53.26’, 22) #edited# local_addr = (‘192.168.115.103’, 22) #edited# vmchannel = vmtransport.open_channel(“direct-tcpip”, … Read more
pysftp is a wrapper around Paramiko with a more Python-ish interface. pysftp interface does not expose all of the features of Paramiko. On the other hand, pysftp implements more high-level features on top of Paramiko, notably recursive file transfers. pysftp has not been updated since 2016, so it seems abandoned project. It has also some … Read more
When you run exec_command multiple times, each command is executed in its own “shell”. So the previous commands have no effect on an environment of the following commands. If you need the previous commands to affect the following commands, just use an appropriate syntax of your server shell. Most *nix shells use a semicolon or … Read more
If the ls -R prints lots of error output (what is likely if the current user is not root => does not have access to all folders), your code deadlocks eventually. It’s because, the output buffer of the error stream eventually fills, so the ls stops working, waiting for you to read the stream (empty … Read more
Paramiko names its loggers, so simply: import logging import paramiko logging.basicConfig() logging.getLogger(“paramiko”).setLevel(logging.WARNING) # for example See the logging cookbook for some more examples. You can also use log_to_file from paramiko.util to log directly to a file.