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I want to install two centOS V6.2 on the same Hardidsk but on different partition. After installing on different different partition, at the time of booting it shows only centOS which is installed at last.
Can some help me to install two centOS on the same Harddrive.
I assume that you are using GRUB. Bootup with whatever CentOS that boots up. Open the grub.conf file (normally under /boot/grub). Find the kernel and initramfs of the other installation of CentOS.(usually under /boot)
Copy the title, root, kernel and initrd lines in grub.conf file, and paste those lines after the existing ones. Make changes to the newly pasted lines. Change the title to reflect the text in the new menu. Change root to the / of the other installation partition in GRUB terms. Change the kernel and initrd params to reflect the location of other kernel and initramfs.
Delete the line 'hiddenmenu' and increase the timeout to display GRUB menu properly. Save the changes and reboot.
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Closed 4 years ago.
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Installed windows 10 on a new SSD but I apparently made the mistake of doing this while the original windows 10 HDD was still connected. Apparently the windows 10 installer edits the EFI of the original drive, which is definitely not wanted. Anyway, this causes the original windows 10 installation, on the original drive, to fail to boot because the EFI now points to a drive that doesn't exist. How can the EFI on the original drive be updated to correct this?
After messing around for a day or two I found out that none of the bootrec commands posted everywhere worked. For example:
bootrec /fixboot
The system cannot find the file specified.
The solution was to use "EasyUEFI" by "Hasleo Software" to edit the EFI to point to the actual windows installation. Took all of 2 seconds to fix after that.
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Closed 7 years ago.
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Today,I encounter a very tough problem which cost me nearly 6 hours.
When I remove a file called ha_wan.conf using rm -rf ha_wan.conf command under /etc directory,Success.When I use ls -al command to see the result,The file disappear.
But when I reboot the linux system,same file named ha_wan.conf come back,located under /etc/ directory.
I tried to delete it many many times,It is the same result.
What should I do,I want to permanently remove that file.Thanks.
There's no magic. You removed the file. If you still see it after a reboot, it means one of two things:
(very likely) Some service recreates the files on boot, or periodically. You can probably use standard system tools to find out which package contained that file. (for example dpkg -S ha_wan.conf in debian-like systems)
(unlikely) You're running some interesting system which uses a temporary filesystem in /etc. If you're using a standard desktop distribution, that's improbable. But if it's some kind of router / special device, then it could happen.
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Closed 7 years ago.
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I'm running CentOS 6.4 in a VMWare Player virtual machine. I was trying to add two partitions to the file system. First I used fdisk to add the partitions, then mke2fs, then I mounted the partitions. Then I manually edited /etc/fstab, I added lines for the new partitions listed by blkid.
When I restarted, the OS is failing to start, it brings me to a terminal. So I tried to undo the changes I made to the /etc/fstab file, but it's saying that everything is read only, even though I am root. It won't let me remove the lines I added before to /etc/fstab.
Does anybody know how I can recover? At least how to get the stupid thing to boot again.
I think you need to remount the filesystem in rw mode:
mount -o rw,remount /
After that you can edit /etc/fstab and revert your changes, save the file and reboot.
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Closed 9 years ago.
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Using buildroot 2013.05 (with Freescale i.MX6 CPU).
When I change date/time from console, e.g.: date -s "2013-11-26 02:11", this setting will lost during reboot. I'd learned, that I have to call hwclock -wu afterwards.
But what's the way to configure my buildroot-based linux that the hwclock is set automatically after date/time has been changed (regardless if date/time changed from linux console or via libc call from a C program).
The standard way to handle the hwclock on linux systems is to save the system time to the hardware clock during reboot, and restore it on boot. This is done through init scripts.
So in buildroot, you would add an init script that ends up in /etc/init.d/Sxxhwclock, typically using a rootfs overlay, or alternatively with a completely custom target skeleton.
See http://buildroot.uclibc.org/downloads/manual/manual.html#rootfs-custom for more info on customizing the target rootfs.
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I recently made the following (i believe important) changes to my system
Actually I was following this tutorial to use something called Linux Containers.
So can you tell me if any of the following stuff is capable enough to crash my system ?
1. Making changes to /etc/fstab or
2. mount /cgroup which will try to mount cgroups automatically or
3 making changes to etc/network/interfaces or
4 making changes to /etc/resolv.conf
A typo in fstab can definitely make a system un-bootable. However, you should be able to boot from CD, mount the HD, and fix it.