The source of the issue is around the ext4 filesystem and grub 0.97[1]. In Bionic, ext4 has 64bit and metadata_csum features which grub 0.97 in Centos6 cannot handle read. There are couple of workarounds here:
A) Use Xenial to deploy Centos6
B) If you use bionic, then you'll need custom storage where you create a /boot partition smaller than 512Mb and put either ext2 or ext3 as the filesystem format.
The source of the issue is around the ext4 filesystem and grub 0.97[1]. In Bionic, ext4 has 64bit and metadata_csum features which grub 0.97 in Centos6 cannot handle read. There are couple of workarounds here:
A) Use Xenial to deploy Centos6
B) If you use bionic, then you'll need custom storage where you create a /boot partition smaller than 512Mb and put either ext2 or ext3 as the filesystem format.
1. https:/ /bugzilla. redhat. com/show_ bug.cgi? id=1099237