In the Redundant Line Control function 4.6A00, specification changes from RHEL7 when using the Redundant Line Control function in RHEL8 or later are as follows.
(1) Environment settings
[Description 1]
The handling of the operating system configuration file (ifcfg-ethX file) in GLS has been changed.
[Changes 1]
RHEL7
GLS does not update the operating system configuration file (ifcfg-ethX file).
RHEL8 or later
GLS updates the operating system configuration file (ifcfg-ethX file).
[Description 2]
The operation if there is a difference between the system settings by a user and the settings by GLS when installing GLS has been changed.
[Changes 2]
RHEL7
Before starting GLS, the IP address is set according to the system definition and after starting GLS, the IP address is set according to the GLS definition.
RHEL8 or later
The IP address is always set according to the GLS definition.
[Description 3]
The configuration for using the tagged VLAN interface in a Virtual NIC mode has changed.
[Changes 3]
RHEL7
OS configuration changes for link state are not required when configuring tagged VLAN interfaces on virtual interfaces.
RHEL8 or later
OS configuration changes for link state are required in/etc/NetworkManager/NetworkManager.conf when configuring tagged VLAN interfaces on virtual interfaces.
For more information, see Section "3.3.3 Virtual NIC mode."
[Description 4]
The procedure for executing OS commands and editing files has been changed when setting the environment.
[Changes 4]
RHEL7
RHEL 7 does not support NetworkManager.
RHEL8 or later
Since RHEL 8 and later supports NetworkManager, the procedure for executing OS commands and editing files differs from RHEL 7 and earlier.
(2) Settings of the physical interface (ifcfg-ethX file)
[Description]
The settings of the physical interface (ifcfg-ethX file) when installing GLS has been changed.
[Changes]
For details, refer to "3.2.2 Network configuration."
(3) Change the scope of support
[Description 1]
Redundant network methods available on the KVM host (host OS) has been changed.
[Changes 1]
RHEL7
Supports a KVM host (host OS) configuration that uses NIC switching mode to bundle virtual bridges on the virtual interfaces.
RHEL8 or later
Configuring a KVM host (host OS) to bundle virtual bridges on the virtual interfaces using a NIC switching mode is not supported.
For RHEL 8 or later, if you want to make the guest domain network more reliable on KVM hosts in a cluster system, use the "C.6.3 Setup example for creating a highly reliable network of guest domains on KVM hosts in a cluster system" configuration.
[Description 2]
The interfaces that can be bundled in the GLS virtual interface has been changed.
[Changes 2]
RHEL7
The Virtual NIC mode allows bundling of non-GLS virtual interfaces (bonding).
RHEL8 or later
Non-GLS virtual interfaces (bonding) cannot be bundled.
