CentOS Linux Templates

CentOS Linux 7.6 x64

Template label	Operating system	OS release	OS arch	Virtualization	Version
CentOS 7.6 x64	CentOS Linux	7.6	x64	xen, kvm, kvm_virtio	1.0-1.1

Issues: There is no VNC console for Xen guests as Red Hat dropped Xen DomU support on 7.x releases.
Limitation: Includes only new grub2 installed, so isn't supported by old OnApp versions < 5.5.

Template label	Operating system	OS release	OS arch	Virtualization	Version
CentOS 7.6 Plus x64	CentOS Linux	7.6	x64	xen, kvm, kvm_virtio	1.0-1.1

Issues: no
Limitation: Uses kernel-plus to solve VNC console issue under Xen. Includes only new grub2 installed, so isn't supported by old OnApp versions < 5.5

Template label	Operating system	OS release	OS arch	Virtualization	Version
CentOS 7.6 grub_0_97 x64	CentOS Linux	7.6	x64	xen, kvm, kvm_virtio	1.0

Template label	Operating system	OS release	OS arch	Virtualization	Version
CentOS 7.7 grub_0_97 x64	CentOS Linux	7.7	x64	xen, kvm, kvm_virtio	1.0

Issues: There is no VNC console for Xen guests as Red Hat dropped Xen DomU support on 7.x releases.
Limitation: Includes a legacy grub installed version 0.97-99.el6

Template label	Operating system	OS release	OS arch	Virtualization	Version
CentOS 8.0 x64	CentOS Linux	8.0	x64	kvm, kvm_virtio	1.0 -1.3

Issues: After operating system upgrade (with 'yum update') and before reboot, please check and modify GRUB_ENABLE_BLSCFG option's value (set it into 'false',) in GRUB2 boot loader's default configuration file /etc/default/grub. Then generate new GRUB2 boot loader's main config with:
```
# grub2-mkconfig -o /boot/grub2/grub.cfg
```
Reboot the system (if required).

Limitation: The template isn't compatible with Xen. Red Hat Enterprise Linux release 8.x and its clones (like CentOS Linux) can't run as Xen PV DomU (the kind of model OnApp runs Linux guests) anymore. Xen PV guest support has been disabled for all 8.x releases.
Technical details:
```
# cat /etc/redhat-release 
CentOS Linux release 8.0.1905 (Core)
# uname -r
4.18.0-80.7.1.el8_0.x86_64
# grep -i CONFIG_XEN_PV /boot/config-`uname -r`
# CONFIG_XEN_PV is not set
```
The reason is CONFIG_XEN_PV Linux kernel configuration item (was introduced in linux kernel versions >= *4.12*) unset on the kernel;
prompt: Xen PV guest support
type: bool
depends on: CONFIG_XEN
defined in arch/x86/xen/Kconfig
found in Linux kernels: 4.12–4.20, 5.0–5.2, 5.3-rc+HEAD
Help text: Support running as a Xen PV guest.

Template label	Operating system	OS release	OS arch	Virtualization	Version
CentOS 8.0 kernel_ml x64	CentOS Linux	8.0	x64	xen, kvm, kvm_virtio	1.0

Issues: After operating system upgrade (with 'yum update') and before reboot, please check and modify GRUB_ENABLE_BLSCFG option's value (set it into 'false',) in GRUB2 boot loader's default configuration file /etc/default/grub. Then generate new GRUB2 boot loader's main config with:
```
# grub2-mkconfig -o /boot/grub2/grub.cfg
```
Reboot the system (if required).
Limitation: Using the kernel-ml may expose your system to security, performance and/or data corruption issues. Since timely updates may not be available from the ELRepo Project, the end user has the ultimate responsibility for deciding whether to continue using the kernel-ml packages in regular service. These packages are not signed for SecureBoot.