How do you ssh into a remote host through a jump host and execute multiple commands? [duplicate]

Question

Im looking to write a python script which need to perform the following:

1. SSH into host A
2. From host A, SSH into host B (host B can be connected only from host A)
3. From host B, Execute set of commands and show the output on screen

Could someone please advise on how to achieve this?

Answer 1

i did something similar with paramiko:

from paramiko.client import SSHClient, AutoAddPolicy

class SSHCmd(object):

    def __init__(self,server1,password1):
        self.server1 = server1
        self.password1 = password1
        self.ssh = SSHClient()
        self.chan = None
        self.connect()

    def connect(self):#connect to the first One ( server1 )
        self.ssh.set_missing_host_key_policy(AutoAddPolicy())
        self.ssh.connect(self.server1, username='USERNME', password='PASS')
        self.chan = self.ssh.invoke_shell()

    def sendCMD(self,cmd,endswith):
        if cmd[-1]!='\n':
            cmd+='\n'
        buff = ''
        while not buff.endswith(endswith):
            resp = self.chan.recv(9999)
            buff += str(resp.decode())
            print(buff)
        self.chan.send(cmd)
        return buff

    def getBuffer(self,ends='> '):
        buff = ''
        while not buff.endswith(ends):
            resp = self.chan.recv(9999)
        buff+= resp.decode()
        return buff

    def close(self):
        self.ssh.close()

then you can create an SSHObject with:

ssh = SShCmd('serverA','passwordA')
ssh.sendCMD('ssh serverB\n','USERNAME> ')
#ssh.sendCMD('yes\n','(yes/no)? ')#if shh fingerprint don't exist
ssh.sendCMD('passwordB.\n','password: ')
ssh.sendCMD('YOUR COMMAND HERE.\n','USERNAME> ')
ssh.close()