Above is the output fromno errors, i do not succesfull boot on hdd from 24hours (im on netboot) and i get this for today :
DBG: 10919: Fri Jan 18 12:12:39 2019: command line: --default-kernel
DBG: Image entry succeeded:
DBG: menuentry 'GNU/Linux with OVH Kernel, OVH kernel 4.9.87-xxxx-std-ipv6-64' {
DBG: load_video
DBG: set gfxpayload=keep
DBG: insmod part_gpt
DBG: insmod part_gpt
DBG: insmod diskfilter
DBG: insmod mdraid09
DBG: insmod ext2
DBG: set root='mduuid/2fbcdcf2f2dde0c4a4d2adc226fd5302'
DBG: if [ x$feature_platform_search_hint = xy ]; then
DBG: search --no-floppy --fs-uuid --set=root --hint='mduuid/2fbcdcf2f2dde0c4a4d2adc226fd5302' 09c4d
bce-1565-42ce-a0b2-2a1179a74bdc
DBG: else
DBG: search --no-floppy --fs-uuid --set=root 09c4dbce-1565-42ce-a0b2-2a1179a74bdc
DBG: fi
DBG: linux /bzImage-4.9.87-xxxx-std-ipv6-64 root=/dev/md3 ro crashkernel=auto rhgb quiet rootde
lay=10
DBG: }
/var/log/grubby ??
please mention this in your post.
The output shows that you successfully booted an OVH (net)Kernel. This gives you no info on boot issues when using the hdd kernel.
Read here : HowTos/Grub2 - CentOS Wiki
Try suggested steps to check what grub entry is set to default and check if this is correct. If not, change entry as described.