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Grub2: Set default kernel on CentOS7 while in Ubuntu recovery mode
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| Server4you customer web login -> Boot into Recvery mode (Ubuntu) | |
| SSH connect and execute on recovery terminal: | |
| > fdisk -l | |
| > mdadm --assemble --scan | |
| > mount /dev/md1 /mnt | |
| > mount /dev/md0 /mnt/boot | |
| > mount -t proc proc /mnt/proc | |
| > mount -t sysfs sys /mnt/sys | |
| > mount -o bind /dev /mnt/dev | |
| > mount -t devpts pts /mnt/dev/pts/ | |
| > chroot /mnt | |
| Now the Grub2 maintenance commands can be applied to CentOS: | |
| > awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg | |
| > grub2-editenv list | |
| > grub2-set-default 2 | |
| > vim /etc/default/grub | |
| > grub2-mkconfig -o /boot/grub2/grub.cfg | |
| Alternatively: | |
| > yum list kernel | |
| > yum remove kernel-3.10.0-693.17.1.el7 |
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