from pexpect import pxssh
try:
   s = pxssh.pxssh()
   hostname = '***'
   username = '***'
   password = '***'
   s.login (hostname, username, password)
   print("logged in")
   while 1:
      time.sleep(3)
      s.sendline('sudo lxc exec abc-1 -- /root/tail  /usr/local/var/syslog')
      s.prompt()
      msg = (s.before).decode("utf-8")
      with open("Output.txt", "a") as f:
         f.write(msg + 'rn')
   s.logout()
except pxssh.ExceptionPxssh as e:
print ("pxssh failed on login.")
print (str(e))

class ReadLogs(threading.Thread):
def __init__(self, erv):
    threading.Thread.__init__(self)
    self.erv = erv
    self.s = pxssh.pxssh()
    hostname = '***'
    username = '***'
    password = '***'
    self.s.login(hostname, username, password)

def run(self):
    while 1:
        print('running thread for ' + self.erv)
        time.sleep(5)
        self.s.sendline('sudo lxc exec ' + self.erv + ' -- /root/tail  /usr/local/var/syslog')
        self.s.prompt()
        self.msg = (self.s.before).decode("utf-8")
        with open(self.erv + "_logs.txt", "a") as f:
             f.write(self.msg + 'rn')

    self.s.logout()

if __name__ == '__main__':
   c1 = ReadLogs("abc-1")
   c1.start()
   c2 = ReadLogs("abc-2")
   c2.start()

logged in
running thread for abc-1
running thread for abc-2
running thread for abc-1
running thread for abc-1
running thread for abc-1
running thread for abc-2
running thread for abc-1
running thread for abc-2
running thread for abc-1
running thread for abc-2
running thread for abc-2
running thread for abc-1
running thread for abc-2
running thread for abc-1
running thread for abc-1
running thread for abc-1
running thread for abc-1
running thread for abc-2
running thread for abc-1
running thread for abc-1
running thread for abc-1