python paramiko ssh

Question

i m new on python  i wrote a script to connect to a host and execute one command  ssh   paramiko SSHClient   ssh set missing host key policy paramiko AutoAddPolicy    ssh connect host  username user  password pw   print  running remote command   stdin  stdout  stderr   ssh exec command command  stdin close    for line in stdout read   splitlines        print   s    s     host  line      if outfile    None          f outfile write   s n   line   for line in stderr read   splitlines        print   s    s     host  line     n       if outfile    None          f outfile write   s n   line   ssh close    if outfile    None      f outfile close    print  connection to  s closed   host  except     e   sys exc info   1     print   s   e   works fine when then remote command doesn t need a tty  i found an invoke shell example Nested SSH session with Paramiko   i m not happy with this solution  because if a server has an prompt that isn t specified in my script -  infinite loop or a specified prompt in the script is a string in the return text -  not all data will be received  is there a better solution maybe where stdout and stderr are send back like in my script

User · Accepted Answer

There is extensive paramiko API documentation you can find at: http://docs.paramiko.org/en/stable/index.html

I use the following method to execute commands on a password protected client:

import paramiko

nbytes = 4096
hostname = 'hostname'
port = 22
username = 'username' 
password = 'password'
command = 'ls'

client = paramiko.Transport((hostname, port))
client.connect(username=username, password=password)

stdout_data = []
stderr_data = []
session = client.open_channel(kind='session')
session.exec_command(command)
while True:
    if session.recv_ready():
        stdout_data.append(session.recv(nbytes))
    if session.recv_stderr_ready():
        stderr_data.append(session.recv_stderr(nbytes))
    if session.exit_status_ready():
        break

print 'exit status: ', session.recv_exit_status()
print ''.join(stdout_data)
print ''.join(stderr_data)

session.close()
client.close()

User · Answer

The code of  ThePracticalOne is great for showing the usage except for one thing  Somtimes the output would be incomplete  session recv ready   turns true after the if session recv ready    while session recv stderr ready   and session exit status ready   turned true before entering next loop   so my thinking is to retrieving the data when it is ready to exit the session   while True  if session exit status ready    while True      while True          print  try to recv stdout             ret   session recv nbytes          if len ret     0              break         stdout data append ret       while True          print  try to recv stderr             ret   session recv stderr nbytes          if len ret     0              break         stderr data append ret      break

User · Answer

There is something wrong with the accepted answer  it sometimes  randomly  brings a clipped response from server  I do not know why  I did not investigate the faulty cause of the accepted answer because this code worked perfectly for me   import paramiko  ip  server ip  port 22 username  username  password  password   cmd  some useful command    ssh paramiko SSHClient   ssh set missing host key policy paramiko AutoAddPolicy    ssh connect ip port username password   stdin stdout stderr ssh exec command cmd  outlines stdout readlines   resp    join outlines  print resp   stdin stdout stderr ssh exec command  some really useful command   outlines stdout readlines   resp    join outlines  print resp

User · Answer

Use paramiko to connect to LINUX platform             import paramiko  ip  server ip  port 22 username  username  password  password  ssh paramiko SSHClient   ssh set missing host key policy paramiko AutoAddPolicy    ssh connect ip port username password   --------Connection Established-----------------------------        To run shell commands on remote connection            import paramiko  ip  server ip  port 22 username  username  password  password  ssh paramiko SSHClient   ssh set missing host key policy paramiko AutoAddPolicy    ssh connect ip port username password    stdin stdout stderr ssh exec command cmd  outlines stdout readlines   resp    join outlines  print resp    Output

[python] python paramiko ssh

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