CentOS Linux Templates

CentOS Linux 7.6 x64

• 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.

CentOS Linux 7.6 x64 (with kernel-plus)

• 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.

CentOS Linux 7.6 x64 (with legacy grub)

• Issues: no.
• Limitation: Includes a legacy grub installed version 0.97-99.el6.

CentOS Linux 7.7 x64 (with legacy grub)

• 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.

CentOS Linux 7.8 x64

• Issues: There is no VNC console for Xen guests as Red Hat dropped Xen DomU support on 7.x releases.
• Limitations: none.

CentOS 7.9 x64

• Issues: There is no VNC console for Xen guests as Red Hat dropped Xen DomU support on 7.x releases.
• Limitations: none.

CentOS 7.9 plus x64

• Issues: no.
• Limitations: Uses kernel-plus to solve VNC console issue under Xen.

CentOS 7.9 cPanel 11.90.0.16 x64

• Issues: There is no VNC console for Xen guests as Red Hat dropped Xen DomU support on 7.x releases.
• Limitations: none.

CentOS Linux 8.0 x64

• 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.
  

CentOS Linux 8.0 kernel_ml x64

• 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.

CentOS Linux release 8.2.2004 (Core)

• 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.