This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong. {{tag>centos grub}} ====== Reinstall grub2 ====== ===== On Software RAID ===== ==== Prepare chroot ==== <sxh bash> mount /dev/md2 /mnt mount /dev/md1 /mnt/boot mount -t dev -o bind /dev /mnt/dev mount -t proc -o bind /proc /mnt/proc mount -t sys -o bind /sys /mnt/sys chroot /mnt </sxh> === Install grub2 === <sxh bash> grub2-install /dev/sda </sxh> === Check if Grub was written in MBR === <sxh bash> dd bs=512 count=1 if=/dev/sda 2>/dev/null | strings|grep GRUB </sxh> === Check Grub 2 for the kernel line === <sxh bash> egrep ^menuentry /etc/grub2.cfg | cut -f 2 -d \' </sxh> === Set new kernel as default boot entry === <sxh bash> grub2-set-default 1 </sxh> === Check current boot entry === <sxh bash> grub2-editenv list </sxh>