[how to fix error] Device eth0 does not seem to be present, delaying initialization (VMware Linux)

เวลาที่ผม clone VMware ของ centos มักจะมี ปัญหา ที่ network eth0 (ก็ไม่รุ้ Linux อื่นๆ เป็นด้วยมั้ยนะ)

ข้อความ error ก็จะราวๆ

ifup eth0
Device eth0 does not seem to be present, delaying initialization

1. ลบไฟล์ 70-persistent-net.rules:

rm -f /etc/udev/rules.d/70-persistent-net.rules

2. แก้ไขไฟล์ ifcfg-eth0 โดยลบบรรทัด UID กะ MACADDR หรือ commentซะ

sed -i 's/UID/#UID/g' /etc/sysconfig/networking/devices/ifcfg-eth0
sed -i 's/MACADDR/#MACADDR/g' /etc/sysconfig/networking/devices/ifcfg-eth0

3. reboot network connection

service network restart

*ถ้าต้องการตั้งค่า GATEWAY
ให้แก้ไขที่ไฟล์ /etc/sysconfig/network
เพิ่ม GATEWAY=
เช่น

echo "GATEWAY=192.168.100.100">> /etc/sysconfig/network

How to Install MySQL Server 5.1.71-1 and MySQL-Python On CentOS6.5 x64

install MySQL Server

yum install mysql-server mysql-devel

Set the MySQL service to start on boot

chkconfig --levels 235 mysqld on

Start the MySQL service

service mysqld start

Test Log into MySQL

mysql -u root

*type exit to exit mysql


Install MySQL-python

pip install MySQL-python

*you can read "Install Python 2.7.6 on Centos 6.4 x64" for more information

---

my basic MySQL-python Class

mysql.py

#!/usr/bin/python
# -*- coding: utf-8 -*-

import MySQLdb

class classMySQL:
 def __init__(self):
  self.db = None

 def mysql_connect(self, db_user, db_passwd, db_name, db_host='localhost'):
  self.db = MySQLdb.connect(
   host = db_host,
   user = db_user,
   passwd = db_passwd,
   db = db_name
  );
  self.query = self.db.cursor()

 def mysql_close(self):
  if self.db:
   self.db.close()

 def mysql_query(self, query):
  self.query.execute(query)
  return self.query.fetchone()

# Main must be outside the table class
def test():
 _mysql = classMySQL()
 _mysql.mysql_connect("root", "", "mysql")
 print _mysql.mysql_query("select * from user;")
 _mysql.mysql_close()

if __name__ == '__main__':
 test()

run test

python2.7 mysql.py

Decrypt Cisco-encrypted passwords in configuration files

#! /usr/bin/perl -p
# Decrypt Cisco-encrypted passwords in configuration files. Perl
# version; requires perl 4.036 minimum. Unlike many similar tools
# circulating on the net, this one also works for passwords longer
# than 11 characters (i.e. doesn't chop after 11 chars and doesn't
# get confused with newer IOS versions which have alleviated this
# limit).
#
# Absolutely no warranties whatsoever. Use at your own risk. No
# batteries included. Not suitable for children under 3 years.
#
# Written and © by Helge Oldach <ciscocrack@oldach.net>
#
# You are not expected to understand this code, although the algorithm
# is really blatantly stupid. Look how short it is in perl.

@tbl = unpack("C*", "dsfd;kfoA,.iyewrkldJKDHSUBsgvca69834ncxv9873254k;fg87");

($pre, $dummy, $seed, $pwd, $dummy, $suf) = ($_ =~ /^(.*\s+(password|md5)\s+)7\s+([0-1][0-9])(([0-9A-F][0-9A-F])+)(.*)$/);

if ($pwd) {
 $_ = $pre;
 foreach $p ($pwd =~ /../g) {
  $_ .= pack("C", hex $p ^ $tbl[$seed++]);
  $seed %= $#tbl;
 }
 $_ .= $suf . "\n";
}

or

join([chr(int(x[i:i+2],16)^ord('dsfd;kfoA,.iyewrkldJKDHSUBsgvca69834ncxv9873254k;fg87'[(int(x[:2])+i/2-1)%53]))for i in range(2,len(x),2)])