It happened that I had installed my Ubuntu before my CentOS 5.4 OS..
and in the between got Windows XP installed..
Luckily all ubuntu partition have been set as ext3 (with Journal).
so can be mounted inside CentOS 5.4.
The step to recreate entry into CentOS grub for booting into ubuntu is as below :
1. mount the rootfs of Ubuntu into somewhere readable such as
mkdir -p /media/ubuntu mount /dev/sda1 /media/ubuntu -t ext3 |
2. capture previous ubuntu boot config from its partition
cd /media/ubuntu/boot/grub/ vi grub.cfg |
shall have something like this
# # DO NOT EDIT THIS FILE # # It is automatically generated by /usr/sbin/grub-mkconfig using templates # from /etc/grub.d and settings from /etc/default/grub # ### BEGIN /etc/grub.d/00_header ### if [ -s /boot/grub/grubenv ]; then have_grubenv=true load_env fi set default="0" if [ ${prev_saved_entry} ]; then saved_entry=${prev_saved_entry} save_env saved_entry prev_saved_entry= save_env prev_saved_entry fi insmod ext2 set root=(hd0,2) search --no-floppy --fs-uuid --set 1a2b230e-d172-4b48-8395-72a33ebce462 if loadfont /usr/share/grub/unicode.pf2 ; then set gfxmode=640x480 insmod gfxterm insmod vbe if terminal_output gfxterm ; then true ; else # For backward compatibility with versions of terminal.mod that don't # understand terminal_output terminal gfxterm fi fi if [ ${recordfail} = 1 ]; then set timeout=-1 else set timeout=10 fi ### END /etc/grub.d/00_header ### ### BEGIN /etc/grub.d/05_debian_theme ### set menu_color_normal=white/black set menu_color_highlight=black/white ### END /etc/grub.d/05_debian_theme ### ### BEGIN /etc/grub.d/10_linux ### menuentry "Ubuntu, Linux 2.6.31-14-generic" { recordfail=1 if [ -n ${have_grubenv} ]; then save_env recordfail; fi set quiet=1 insmod ext2 set root=(hd0,2) search --no-floppy --fs-uuid --set 1a2b230e-d172-4b48-8395-72a33ebce462 linux /boot/vmlinuz-2.6.31-14-generic root=UUID=1a2b230e-d172-4b48-8395-72a33ebce462 ro quiet splash initrd /boot/initrd.img-2.6.31-14-generic } menuentry "Ubuntu, Linux 2.6.31-14-generic (recovery mode)" { recordfail=1 if [ -n ${have_grubenv} ]; then save_env recordfail; fi insmod ext2 set root=(hd0,2) search --no-floppy --fs-uuid --set 1a2b230e-d172-4b48-8395-72a33ebce462 linux /boot/vmlinuz-2.6.31-14-generic root=UUID=1a2b230e-d172-4b48-8395-72a33ebce462 ro single initrd /boot/initrd.img-2.6.31-14-generic } ### END /etc/grub.d/10_linux ### |
copy those line with root=UUID info
set root=(hd0,2) linux /boot/vmlinuz-2.6.31-14-generic root=UUID=1a2b230e-d172-4b48-8395-72a33ebce462 ro quiet splash initrd /boot/initrd.img-2.6.31-14-generic |
3. copy out the necessary file (ubuntu vmlinuz and initrd) into current CentOS boot partition.
cp /media/ubuntu/boot/vmlinuz-2.6.31-14-generic /boot/ cp /media/ubuntu/boot/initrd.img-2.6.31-14-generic /boot/ |
4. edit the CentOS grub.conf
to have something like this..
# grub.conf generated by anaconda # # Note that you do not have to rerun grub after making changes to this file # NOTICE: You do not have a /boot partition. This means that # all kernel and initrd paths are relative to /, eg. # root (hd0,4) # kernel /boot/vmlinuz-version ro root=/dev/sda5 # initrd /boot/initrd-version.img default=0 timeout=5 splashimage=(hd0,4)/boot/grub/splashmac3.xpm.gz hiddenmenu title CentOS (2.6.18-164.6.1.el5) root (hd0,4) kernel /boot/vmlinuz-2.6.18-164.6.1.el5 ro root=LABEL=/ rhgb quiet vga=791 initrd /boot/initrd-2.6.18-164.6.1.el5.img title Windows rootnoverify (hd0,1) chainloader +1 title Ubuntu 9.10 - Karmic Kaola root (hd0,4) kernel /boot/vmlinuz-2.6.31-14-generic root=UUID=1a2b230e-d172-4b48-8395-72a33ebce462 ro quiet splash initrd /boot/initrd.img-2.6.31-14-generic |
Note : the root(hd0,4) is where CentOS “/boot” located.
4. that’s it.. might want to recheck with these..
grub-install --recheck --no-floppy /dev/sda |
then reboot..
shall be able to get into Ubuntu Karmic Kaola with the grub menu ..
how nice Ubuntu tight it “rootfs” to “UUID=” instead of just “LABEL=/”
so.. Ubuntu actually can intelligently differentiate “/” partition between each “linux OS” so that would not messing up with one another “/” belonging to others….
while CentOS is just referring to partition with “LABEL=/”..
which is could be messing up if got multiple “linux rootfs” inside..
the system.. (consider if adding another hardisk from another CentOS to recover data .. and reboot. woohoo. .I bet will confuse which one is which..)
p/s : anyway.. messing up with hardisk could be a thrill… if you want to explore.. hehehee..
Thank you very much…….
Kindly advice, I want to use OpenWRT for my TP-Link router model TL-WR1043ND version 1.10 starting serial number with 12.
Requested for UNIFI Malaysia 20 MB
Kindly advice which files I do need to download, highly appropriated in advance .
Regards
Robert
(Shah Alam)
Good Morning ,
I have a TL-WR1043ND router Ver 1.10 and not able to find Hardware version, as what I understood from other posts that this should be then Hardware version 1.
Have installed OpenWRT in total 3 files :
German stock firmware (v3.9.17)
– attitude_adjustment 12.09-rc2 and
attitude_adjustment 12.09-rc2 and able to able access my router TL-WRT1043ND
I guess that it is my age (59) but I a losing it on the configuration and explanation, first the first of all on many images that I have seen on the internet in the part Internet -> Swith VLAN witch is starting with PORT 1 -2-3-4-5-CPU however on my installed OpenWRT it starts with PORT 0-1-2-3-4-CPU so I guess something is already wrong on my side, having said this most images are related to HARDWARE VERSION 1.8
My main goal is to get connect to UNIFI Malaysia (20MB connection) I know that Unifi provides an IPTV package but to honest I don’t need this IPTV connection at all.
The bottom line, I like get connected to UNIFI with OPENWRT and I am really begging f someone can assist me in to get connect to Unifi. I know it is labor day (May 1) but will be great full if somebody can assist me.