FAQ
Hi All,


Im using Paramiko for my SSH automation. Im using method that is shown in demo_simple.py example which comes with Paramiko. Below is code from demo_simple.py.


As you can make out, below code opens SSH connection and opens Interactie Shell, and then wait for the command from user.
I want to submit the command to this Interactive Shell using code.


try:
     client = paramiko.SSHClient()
     client.load_system_host_keys()
     client.set_missing_host_key_policy(paramiko.WarningPolicy())
     print '*** Connecting...'
     client.connect(hostname, port, username, password)
     chan = client.invoke_shell()
     print repr(client.get_transport())
     print '*** Here we go!'
     print
     interactive.interactive_shell(chan)
     chan.close()
     client.close()


Well Another approach I tried is instead of opening interactive_shell, directly issue command using;


  stdin, stdout, stderr = client.exec_command(bv_cmd)
             for line in stderr.readlines():
                 print line
             for line in stdout.readlines():
                 print line
But problem here is client.exec_command(bv_cmd) waits for command to execute completely and then it returns to stdout,stderr. And I want to see the ouput from the command during its execution. Because my command takes long time for execution.


Big Picture in My Mind: Big Picture I that want to achieve is, Opening different SSH connection to different host, and it will issue commands to all host, wait for execution. All execution should happen parallel.(just wanted to share my thought, and wanted to hear opinions from you all. Is this possible??). I am not big programmer, just 2 years experience with asp.net C# 2.0 so i would appreciate if discussion happens in simple english.

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  • Sagar varule at Aug 11, 2013 at 5:18 am

    On Thursday, August 8, 2013 12:50:25 PM UTC+5:30, sagar varule wrote:
    Hi All,



    Im using Paramiko for my SSH automation. Im using method that is shown in demo_simple.py example which comes with Paramiko. Below is code from demo_simple.py.



    As you can make out, below code opens SSH connection and opens Interactie Shell, and then wait for the command from user.

    I want to submit the command to this Interactive Shell using code.



    try:

    client = paramiko.SSHClient()

    client.load_system_host_keys()

    client.set_missing_host_key_policy(paramiko.WarningPolicy())

    print '*** Connecting...'

    client.connect(hostname, port, username, password)

    chan = client.invoke_shell()

    print repr(client.get_transport())

    print '*** Here we go!'

    print

    interactive.interactive_shell(chan)

    chan.close()

    client.close()



    Well Another approach I tried is instead of opening interactive_shell, directly issue command using;



    stdin, stdout, stderr = client.exec_command(bv_cmd)

    for line in stderr.readlines():

    print line

    for line in stdout.readlines():

    print line

    But problem here is client.exec_command(bv_cmd) waits for command to execute completely and then it returns to stdout,stderr. And I want to see the ouput from the command during its execution. Because my command takes long time for execution.



    Big Picture in My Mind: Big Picture I that want to achieve is, Opening different SSH connection to different host, and it will issue commands to all host, wait for execution. All execution should happen parallel.(just wanted to share my thought, and wanted to hear opinions from you all. Is this possible??). I am not big programmer, just 2 years experience with asp.net C# 2.0 so i would appreciate if discussion happens in simple english.

    Can any one comment on this..
  • Joshua Landau at Aug 11, 2013 at 5:58 am

    On 11 August 2013 06:18, sagar varule wrote:
    Can any one comment on this..

    If you don't get replies here it's probably because no-one knows
    Paramiko. I suggest posting elsewhere to see if there are any Paramiko
    users in other places willing to help. There might be a Paramiko
    mailing list.


    You also didn't say what didn't work with the first block of code.
    Also, what is "interactive"?
  • Sagar varule at Aug 11, 2013 at 7:02 am

    On Sunday, August 11, 2013 11:28:31 AM UTC+5:30, Joshua Landau wrote:
    On 11 August 2013 06:18, sagar varule wrote:

    Can any one comment on this..


    If you don't get replies here it's probably because no-one knows

    Paramiko. I suggest posting elsewhere to see if there are any Paramiko

    users in other places willing to help. There might be a Paramiko

    mailing list.



    You also didn't say what didn't work with the first block of code.

    Also, what is "interactive"?

    Submitting Command to Interactive Shell through code did not work.
  • Joshua Landau at Aug 11, 2013 at 7:10 am

    On 11 August 2013 08:02, sagar varule wrote:
    On Sunday, August 11, 2013 11:28:31 AM UTC+5:30, Joshua Landau wrote:
    You also didn't say what didn't work with the first block of code.
    Submitting Command to Interactive Shell through code did not work.

    In what way didn't it work? What's the problem?


    Also, what is "Interactive Shell"?
  • Chris Angelico at Aug 11, 2013 at 8:57 am

    On Thu, Aug 8, 2013 at 8:20 AM, sagar varule wrote:
    stdin, stdout, stderr = client.exec_command(bv_cmd)
    for line in stderr.readlines():
    print line
    for line in stdout.readlines():
    print line
    But problem here is client.exec_command(bv_cmd) waits for command to execute completely and then it returns to stdout,stderr. And I want to see the ouput from the command during its execution. Because my command takes long time for execution.



    Are you certain that exec_command is what's waiting, and not readlines()?


    ChrisA
  • Joshua Landau at Aug 11, 2013 at 10:10 am

    On 11 August 2013 09:57, Chris Angelico wrote:
    On Thu, Aug 8, 2013 at 8:20 AM, sagar varule wrote:
    stdin, stdout, stderr = client.exec_command(bv_cmd)
    for line in stderr.readlines():
    print line
    for line in stdout.readlines():
    print line
    But problem here is client.exec_command(bv_cmd) waits for command to execute completely and then it returns to stdout,stderr. And I want to see the ouput from the command during its execution. Because my command takes long time for execution.
    Are you certain that exec_command is what's waiting, and not readlines()?

    That's a very good catch;


    Sagar, you might want to look at:
    http://stackoverflow.com/a/4896288/1763356
    for a good solution if this is the case. There might be more builtin
    ways (maybe select.select) but I'm betting that link's the most
    rigorous.

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