option rom dump from Linux

http://www.coreboot.org/VGA_support

cat /proc/iomem |head -n 3|tail -n 1|(read m; m=${m/ :*}; s=${m/-*}; e=${m/*-}; dd if=/dev/mem of=vgabios.bin bs=1c skip=$[0x$s] count=$[$[0x$e]-$[0x$s]+1])

will dump the 3rd option rom.

sample pac file

function FindProxyForURL(url, host) {

if (isInNet(dnsResolve(host), "10.0.0.0", "255.0.0.0") ||
   isInNet(dnsResolve(host), "172.0.0.0", "255.0.0.0"))
   return "DIRECT";

if ( shExpMatch(host, "*.facebook.com") )
    return "SOCKS 127.0.0.1:9000";

if ( shExpMatch(host, "*.pchome.com.tw") )
    return "SOCKS 127.0.0.1:9000";

if ( shExpMatch(host, "*.ruten.com.tw") )
    return "SOCKS 127.0.0.1:9000";

if ( shExpMatch(host, "tw.*.yahoo.com") )
    return "SOCKS 127.0.0.1:9000";

if ( shExpMatch(host, "*.blogspot.*") )
    return "SOCKS 127.0.0.1:9000";

return "DIRECT";
}

file://d:\kido.pac

hdd image for PXE boot

dd if=/dev/zero of=kido bs=512 count=20160 --> S63*H16*C20

fdisk -u -C20 -H16 -S63 kido
  c--> DOS Compatibility flag is set
  n --> p --> 1
  t --> b
  a --> 1

ms-sys -9 -f kido
losetup -o32256 /dev/loop0 kido
mkfs.msdos -F 16 -n "KIDO" /dev/loop0
ms-sys -f -6 /dev/loop0
hexedit /dev/loop0
  15h-F8
  18h-3F (S63)
  1Ah-10 (H16)
  1Ch-1Dh (3f 00)
  24h-80

cp command.com  drvspace.bin  io.sys  msdos.sys to image

losetup -d /dev/loop0

mount -o loop,offset=32256 kido hdd --> 32256 = 63*512

shrink down image size by gzip
  gzip kido
  mv kido kido.img

PXE config

  label dos

    kernel /tool/memdisk

    append initrd=/tool/kido.img harddisk c=20 h=16 s=63

mbr --> master boot record (at offset 0)

boot program (at offset 32256)

ms-sys --> http://ms-sys.sourceforge.net/

hexedit --> http://rigaux.org/hexedit.html

f2 to save

f10 to exit

ref=http://www.richud.com/wiki/Ubuntu_Create_Hard_Drive_Image

webatm plugin issue

By disabling ActiveX filtering to enable webatm activeX runs properly.

yum repository setup for yum

After invoking system-config-kickstart, system will try to pull available package information from repository.
If your machine does not have internet capability, it will hang all the time.
Simply create a local repository to /etc/yum.yum.repos.d/folder for system-config-kickstart to build package list.
Please note, repository id must be named as [base] and all system default repository config file need to be moved out of /etc/yum.repo.d to speed up package load process.
[base]
name=CentOS 5.8 x86_64
baseurl=file:///nfs/centos-5.10-x86_64
enabled=1
gpgcheck=1

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

copy repodata from cdrom to local drive

#cp -dpR /mnt/cdrom/repodata /nfs/centos-5.10-x86_64/

use following command to clear cache data

#yum clean all 

use following command to read package information from repository

#yum repolist

Please note, repodata folder need to placed underneath baseurl folder. 

And then you are good to go with system-config-kickstart.

non-interactive fdisk

#!/bin/sh
hdd="/dev/hda /dev/hdb /dev/hdc"
for i in $hdd;do
echo "n
p
1


w
"|fdisk $i;mkfs.ext3 $i;done 

http://xmodulo.com/2012/11/how-to-run-fdisk-in-non-interactive-batch-mode.html

speed up SSH login

1: disable UseDNS from /etc/ssh/sshd_config from remote server
2: specify authentication method when connecting --> -o PreferredAuthentications=password