I have a script that SSH connects from Windows7 to a remote ubuntu server and executes a command. The script returns Ubuntu command output to the Windows cmd window in one go after the command has executed and finished. I am just wondering if there is anyway to return real-time SSH output in my script below, or do I always have to wait for the command to finish before seeing the output.
Here's my working code:
import paramiko
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
host = '9.10.11.12'
port, user, password = 22, 'usr', 'pass'
ssh.connect(host, port, user, password)
stdin,stdout,stderr = ssh.exec_command("cd /opt/app && ./app-tool some_command")
for line in stdout.readlines():
print(line)
ssh.close()
Alternatively, if this is not possible with SSH how would I introduce a spinning cursor icon into the above script? Thanks.
Figured it out in the end, I used 'iter' method in the following line:
for line in iter(stdout.readline,""):
print(line)
The output of your command seems to less than the default buffer size because of which it is getting flushed once the command completes.
By default the bufsize is -1 which means that the system default buffer size is used. If bufsize is set to 1 then it is line buffered.
Use
ssh.exec_command("<cmd>",bufsize=1)
Related
I am trying to connect to a server using SSH protocol through a jump server. When I connect through a terminal using a protocol, the jump server opens a shell and asks for a server number from the list of available servers provided, followed by a user or password. Using the library Paramiko.
My code:
import paramiko
client = paramiko.SSHClient()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
client.connect(
hostname="server_ip",
username="user",
password="pass",
look_for_keys=False,
allow_agent=False
)
com='1'
stdin, stdout, stderr = client.exec_command(com)
data = stdout.read() + stderr.read()
print(data.decode('utf-8'))
I get message:
Invalid target.
My shell on the jump server looks like this:
Your jump server probably shows the selection in an interactive shell session only. So you will have to use SSHClient.invoke_shell, what is otherwise not good thing to do when automating a connection.
See also What is the difference between exec_command and send with invoke_shell() on Paramiko?
I have a below script which i'm using to execute commands on remote hosts as a cetralized user, but this script is reads the host file and execute the command one by one however it also remains on the session until its not unlinked from the shell, Hence i want to have a parallel execution saying that when running the script it should be able to fork multiple ssh connection and login to the host and exit immeadiaely after command execution.
Please let me know if you guys have any trick or expert inputs. Though i'm using paramiko as these hosta rae legarcy UNIX hosts where i'm unable to use ansible or like utilities due to some restrictions.
import paramiko
with open('/data/CR9432/SunOS.txt', 'r') as f:
for host in f:
remote_host = host.rstrip()
remote_pass = "pass123"
smart_user = "mtrooper"
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(remote_host, username=smart_user, password=remote_pass)
transport = ssh.get_transport()
session = transport.open_session()
session.set_combine_stderr(True)
session.get_pty()
#for testing purposes we want to force sudo to always to ask for password. because of that we use "-k" key
############################################
#session.exec_command("shutdown -y -i5 -g0")
############################################
stdin = session.makefile('wb', -1)
stdout = session.makefile('rb', -1)
#you have to check if you really need to send password here
stdin.write(remote_pass +'\n')
stdin.flush()
print"\n"
print "------------------------------------------------------------------------------"
print "Command Execution Output On Hostname: "
print "------------------------------------------------------------------------------"
for line in stdout.read().splitlines():
print 'host: %s: %s' % (remote_host, line)
I'm trying to execute few commands in a Jump server(linux) to access certain devices(modems) using SSH. And then get some device details after login in to the device(modem)
I'm using Paramiko to access jump server, the below code
import paramiko
import time
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect('jump server ip', username='user', password='pass', key_filename='D:\New folder\id_rsa')
stdin, stdout, stderr = ssh.exec_command('pwd') #prints the correct pwd
This works fine
So from the jump server I need to ssh a device(modem) using its ipv6 mac address.
the command is
sudo stbsshv6 'ipv6address'/n
But when I execute any command after ssh the device(modem), I'm not getting anything in stdout. Example:
import paramiko
import time
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect('jump server ip', username='user', password='pass', key_filename='D:\New folder\id_rsa')
stdin, stdout, stderr = ssh.exec_command('sudo stbsshv6 "ipv6address"')
stdin.write('ifconfig wlan0\n')#some working command
print stdout.readlines() # prints nothing
I can do manually the above steps using putty,
I'm new to python, can anyone suggest the right solution for this or any alternate way is also great. Thanks
I want to connect to a network device. But in out policy, I have to ssh successfully to a terminal server first, then from this one, ssh to network device. In Python, I use Paramiko :
import paramiko
ssh = paramiko.SSHClient()
print("OTP : ")
otp = raw_input()
ssh.port=9922
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.load_system_host_keys()
ssh.connect('10.0.0.1',9922,username='khangtt',password=str('12345')+str(otp))
stdin, stdout, stderr = ssh.exec_command('whoami')
stdin.close()
for line in stdout.read().splitlines():
print(line)
Connect to server sucessfully, I can see my username in the output. But I don't know how to SSH to device. I used this but nothing happen to set input user/pass :
stdin, stdout, stderr = ssh.exec_command('telnet 10.80.1.120')
stdin.close()
for line in stdout.read().splitlines():
print(line)
Since you are using paramiko, use the documentation here: https://pynet.twb-tech.com/blog/python/paramiko-ssh-part1.html. Its very explicit.
Or you can also try the codes here to connect:
ssh.connect('10.0.0.1', 'khangtt', str('12345')+str(otp), look_for_keys=False, allow_agent=False)
Or
ssh.connect('10.0.0.1', 'khangtt', str('12345')+str(otp))
in case you don't need look for keys and allow agent.
I have python script that connects to a remote server with lenny operating system. It runs a process in background using following line:
shell.send("cd /my/directory/; nohup ./exec_name > /dev/null 2>&1 &\n")
Then after some other codes, it sends a kill command to the server to stop process execution; here's the code:
shell.send("kill -9 process_pid \n")
It returns no error, but doesn't kill the process and it's still alive in the system. I also tried killall -9 process_name, but I got the same result. Any help?
For more information, here's the code for connecting to the server:
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(hostname = "host_ip", username = "un"], password = "up")
channel = ssh.get_transport().open_session()
pty = channel.get_pty()
shell = ssh.invoke_shell()
I should mention that the user has root privileges.
EDIT 1:
I forgot to say that I tried this:
ssh.exec_command("kill -9 process_pid \n")
But it returned this error:
SSHClient is not active right now.
Edit 2:
As #JimB mentioned in the comment, the problem about exec_command is that the transport has been staled. I made a temporary SSH connection and killed the process by that; it was successful. But I'm still searching for a better way.