from linuxnet.ch
To disable IPv6 in RHEL/CentOS 6.x:
Edit /etc/sysconfig/network
Change the following:
NETWORKING_IPV6=yes to
NETWORKING_IPV6=no
Edit /etc/modprobe.conf
If not present, add the following:
alias net-pf-10 off
alias ipv6 off
Stop the ipv6tables service
service ip6tables stop
Disable the ipv6tables service
chkconfig ip6tables off
After rebooting, IPv6 will be disabled.
The SystemRescueCd has all sorts of useful tools to restore ailing Linux systems.
Check it out at: https://www.sysresccd.org
I recently replaced the RAID 1 drives in my CentOS 5 box and had to reinstall the grub MBR. As the drives are a couple of TB each, I thought I’d try GPT instead of the old MBR partitioning, since soon all drives will exceed MBR’s 2TB limit. Luckily GPT is baked into RH/CentOS kernels (unlike many others).
Restoring the MBR was trickier than I expected and I made a couple of mistakes along the way – wish I had found the following description sooner:
https://idolinux.blogspot.com/2009/07/reinstall-grub-bootloader-on-md0.html
In a nutshell run grub interactively and do the following:
# grub grub> root (hd0,0) root (hd0,0) Filesystem type is ext2fs, partition type 0xfd grub> setup (hd0) setup (hd0) Checking if "/boot/grub/stage1" exists... no Checking if "/grub/stage1" exists... yes Checking if "/grub/stage2" exists... yes Checking if "/grub/e2fs_stage1_5" exists... yes Running "embed /grub/e2fs_stage1_5 (hd0)"... 16 sectors are embedded. succeeded Running "install /grub/stage1 (hd0) (hd0)1+16 p (hd0,0)/grub/stage2 /grub/grub.conf"... succeeded Done. grub> quit # reboot
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