Implementation of Linux network card bonding using Python program

#!/usr/bin/env pythonimport os,sys,time,re,shutilimport socketimport fcntlimport  structimport tracebackimport commands#get interface nameinterface_path =  '/etc/ sysconfig/network-scripts/' Def log (info):     "" " LOG FILES  ....." ""     logfile =  '/root/pxe_install.log '     files =  Open (LogFile, ' a ')     try:        files.write ('%s  : %s \n '% (Time.ctime (), info))     except IOError:         files.close ()     files.close () def get_interface  () :     os.chdir (Interface_path)     eth  = em =  List ()     for inter in os.listdir (Interface_path):         if inter[0:-1] ==  ' Ifcfg-em ':             if inter ==  ' ifcfg-em1 '  or inter ==  ' ifcfg-em2 ':                 em.append (inter)          elif inter[0:-1] ==  ' Ifcfg-eth ':             if inter ==  ' Ifcfg-eth0 '  or inter  ==  ' Ifcfg-eth1 ':                 eth.append (inter)     if eth:         log ("Getting interface file name %s is ok"  %eth)          return eth    else:         log ("Getting iNterface file name %s is ok " %em)          return em def main ():     net_name = get_interface ()      ipaddr = str ()     for inter in net_name:         try:             shutil.move (Inter, '/opt/'  + inter+ '. Bak ')              _interface_config (inter)              new_interface = inter.split ('-') [-1]             if _configure_bond (New_interface):                 _configure_bond (New_interface)           &nbsP;  log ("Bond script init is ok")          except exception,e:            log ( Traceback.format_exc ())     if _interface_modprobe ():         _interface_modprobe ()         if _rester_network ():         _rester_network ()  # set interface eth*  or em*def _interface_config (interface):     "" "         DEVICE=eth0        BOOTPROTO=static         noboot=yes        nm_ controlled=no        master=bond0         slave=yes   &nbsp, "" "     fp = open (interface, ' W ')     new_interface =  Interface.split ('-') [-1]    if interface ==  ' ifcfg-em1 ':         fp.write (' device=%s \n '%new_interface)          fp.write (' bootproto=static \n ')         fp.write (' Onboot=yes \n ')         fp.write (' nm_controlled=no \n ')          fp.write (' master=bond0 \n ')          fp.write (' slave=yes \n ')     elif interface ==  ' ifcfg-em2 ':         fp.write (' device=%s \n '%new_interface)          fp.write (' bootproto=static \n ')          fp.writE (' onboot=yes \n ')         fp.write (' nm_controlled=no \n ')         fp.write (' master=bond0 \n ')          fp.write (' slave=yes \n ')     elif interface ==  ' Ifcfg-eth0 ':         fp.write (' device=%s \n '%new_interface)          fp.write (' bootproto=static \n ')          fp.write (' onboot=yes \n ')         fp.write (' NM_ Controlled=no \n ')         fp.write (' MASTER=bond0 \n ')          fp.write (' slave=yes \n ')     elif  interface ==  ' ifcfg-eth1 ':         fp.write (' DEVICE=%s \ N '%new_interface)          fp.write (' bootproto=static \n ')          fp.write (' onboot=yes \n ')         fp.write (' NM_ Controlled=no \n ')         fp.write (' MASTER=bond0 \n ')          fp.write (' slave=yes \n ')     fp.close () def  _configure_bond (inter):     "" "    DEVICE=bond0     BOOTPROTO=static    ONBOOT=yes    IPADDR=192.168.0.100     NETMASK=255.255.255.0    NETWORK=192.168.0.0     broadcast=192.168.0.255     "" "     #bond  name message     if inter ==  ' eth0 ':         bond_name  =  ' ifcfg-bond0 '     elif inter ==  ' em1 ':         bond_name  =   ' ifcfg-bond0 '     elif inter ==  ' eth1 ':         bond_name =  ' ifcfg-bond0 '     elif inter  ==  ' em2 ':        bond_name =  ' ifcfg-bond0 '      # IP ADDRESS MESSAGE    IF _INTERFACE_GET_IP (inter):         IPADDR  = _INTERFACE_GET_IP (inter)      else:        ipaddr =  ' 0.0.0.0 '      # ip net mask info    try:         net_mk  = os.popen (' ip a |grep %s|grep inet '  %inter). ReadLines () [0] &nbsP;      res = net_mk.split () [1]         net_masklen = res.split ('/') [-1]    except:         net_masklen = 18    net_mask = _interface_sum_ Master (Net_masklen)     # default gateway is ....     try:        net_gate = os.popen (' ip route | Grep default '). ReadLines () [0]        net_gateway = net_ Gate = net_gate.split ('   ') [2]    except:         net_gateway =  ' 0.0.0.0 '        try:         if ipaddr ==  ' 0.0.0.0 ':             return  '         fp = open (bond_name, ' W ')         bond = bond_name.split ('-') [-1]         fp.write ("device=%s \n"  %bond)          fp.write ("bootproto=static \n")         fp.write (" Onboot=yes \n ")         fp.write (" ipaddr=%s \n " %ipaddr)         fp.write ("netmask=%s \n"  % net_mask)          if bond ==  ' bond0 ':             fp.write ("gateway=%s \n"  % net_gateway)              fp.write ("dns1=202.106.0.20 \n")              fp.write ("dns2=8.8.8.8 \n")         log (" Ifcfg-bond* configure is ok ")         return true     except Exception,e:        return  FALSE DEF _INTERFACE_GET_IP (inter):    try:         s = socket.socket (Socket.af_inet, socket. SOCK_DGRAM)         ip = socket.inet_ntoa (Fcntl.ioctl (             s.fileno (),             0x8915,  # SIOCGIFADDR             struct.pack (' 24s ', Inter)) [20:24])          return  ip    except Exception,e:        pass         return # add modprobe bonding modeldef _interface_modprobe ():     try:        fp = open ('/etc/modprobe.d/ Bonding.conf ', ' W ')         fp.write ("#Module  options and  blacklists written by bonding \n ")          Fp.write ("alias bond0 bonding \n")         fp.write (" options bond0 miimon=100 mode=1 \n ")          Fp.close ()         x,y  = commands.getstatusoutput (' Modprobe bonding ')         if x != 0:         &nbsP;   log ("modprobe bonding is failed")          return true    except:        log ( Traceback.format_exc ())         return # Restart  Networkdef _rester_network ():     x,y  = commands.getstatusoutput (' Service network restart ')     if x == 0:         log ("restart netowrk is ok ")          return true    else:        log (" restart netowrk is faild  ")         return #  according to the cidr calculation.net masterdef _interface_sum_master (net_ Master):     mask =   (2** 8)  - 2 **  (24 - int (net_master))      return  ' 255.255.%s.0 '  % mask if __name__  ==  ' __main__ ':     sc = main ()

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Implementation of Linux network card bonding using Python program