error: Diskfilter writes are not supported

# cp -p /etc/grub.d/10_linux /etc/grub.d/10_linux.`date +%Y%m%d.%H%M`
# sed -i 's/quick_boot="1"/quick_boot="0"/' /etc/grub.d/10_linux
# update-grub
# reboot

share internet connection in linux via terminal

On access point side

1. disable firewall
2. enable packet forwarding
   # echo 1 > /proc/sys/net/ipv4/ip_forward
3. set iptables rule for port forwarding
   # iptables -t nat -A POSTROUTING -o -j MASQUERADE

on client side:

1. configure network interface so you can reach the access point
2. set the access point as default gateway
   # route add default gw
3. set dns resolution
   # echo nameserver 8.8.8.8 >> /etc/resolv.conf

Converting the numbers to decimal makes it easier to see which can be used:

# egrep "^ .*|System RAM" /proc/iomem | sed -e 's/ : / /g' -e 's/-/ /g' | awk '{;printf("%d bytes to %d bytes (%d M to %d M) - %s %s\n", strtonum("0x"$1), strtonum("0x"$2), strtonum("0x"$1)/1024/1024, strtonum("0x"$2)/1024/1024, $3, $4)}'

bind for chroot

cd /mnt/sysimage
mount -t proc proc proc/
mount --rbind /sys sys/
mount --rbind /dev dev/

mbr

446 bytes - Bootstrap

64 bytes - Partition table

2 bytes - Signature

deletes mbr only

# dd if=/dev/zero of=/dev/sdc bs=446 count=1

rename disk group

ensure file systems are not mounted
# vxvol -g currentdg stopall
# vxdg deport currentdg
# vxdg -n newdg import currentdg
# vxdg list
# vxrecover -g newdg -sb

add devices to reflect partition map without reboot

partx -v -a /dev/sda

boot localdish from grub

.localboot 0xffff

increase vmware disk size and resize PV

increase vdisk size (vsphere client)

echo 1 > /sys/class/scsi_device/*/device/rescan

pvresize 

Could not sign in. Please check your network connection and try again.

Key applications on Mac such as iMessage, FaceTime and even Facebook integration with Notifications depend on your Mac's Serial Number. If the System Information is showing #Serial Number, you will not be able to sign in.

To solve, search for Blank Board Serializer.

redhat disable ipv6

* /etc/sysconfig/network - add "NETWORKING_IPV6=no"
* /etc/sysctl.conf - add "net.ipv6.conf.all.disable_ipv6 = 1"

# hdiutil convert -format UDRW -o ~/path/to/target.img ~/path/to/ubuntu.iso
# diskutil list
# diskutil unmountDisk /dev/diskN
# sudo dd if=/path/to/downloaded.img of=/dev/rdiskN bs=1m
# diskutil eject /dev/diskN

Re-build Grub on Proliant

/etc/grub.conf
boot=/dev/cciss/c0d0


/boot/grub/device.map
(fd0)     /dev/fd0
(hd0)    /dev/cciss/c0d0

/sbin/grub --batch --device-map=/boot/grub/device.map \
   --config-file=/boot/grub/grub.conf --no-floppy
grub> root (hd0,0)
grub> setup (hd0)
grub> quit

original

Issues after upgrading SuSE

1. Permission of /root is 710 by default after upgrade
2. Timezone may change
3. If server is configured with kdump enabled, Kdump parameter is not preserved in /boot/grub/menu.lst

no gdm and gnome in sles 11

ensure repo is good
zypper install -t pattern x11 gnome
edit /etc/sysconfig/displaymanager and windowmanager
default_wm=gnome
default_display=gdm
check /root perm
init 5

remove ^M characters in vim

:%s/^M//g where ^M is entered by ctrl+V and ctrl+M

set vxdisk to use persistent dsf (agile)

# vxddladm set namingscheme=osn mode=new

network throughput rate

sar -n DEV 1 3

ps process which is fuser a fs

ps -fp `fuser -m /tmp`

get total sum of filesystem usage

df -mP | awk '{sum += $3;} END {print sum;}'