Adding accelerated networking udev rules for RHEL 7 and RHEL 8

Author: anhvoms

articles/virtual-machines/linux/redhat-create-upload-vhd.md

@@ -99,7 +99,7 @@ This section assumes that you've already obtained an ISO file from the Red Hat w
     # Accelerated Networking on Azure exposes a new SRIOV interface to the VM.
     # This interface is transparentlybonded to the synthetic interface,
     # so NetworkManager should just ignore any SRIOV interfaces.
-    SUBSYSTEM=="net", DRIVERS=="hv_pci", ACTION=="add", ENV{NM_UNMANAGED}="1"
+    SUBSYSTEM=="net", DRIVERS=="hv_pci", ACTION!="remove", ENV{NM_UNMANAGED}="1"
     EOF
     ```
 
@@ -209,6 +209,19 @@ This section assumes that you've already obtained an ISO file from the Red Hat w
     NM_CONTROLLED=yes
     ```
 
+    > [!NOTE]
+    > When you use Accelerated Networking, the synthetic interface that's created must be configured to be unmanaged by using a udev rule. This action prevents `NetworkManager` from assigning the same IP to it as the primary interface. <br>
+    
+     To apply it:<br>
+    
+    ```
+    sudo cat <<EOF>> /etc/udev/rules.d/68-azure-sriov-nm-unmanaged.rules
+    # Accelerated Networking on Azure exposes a new SRIOV interface to the VM.
+    # This interface is transparentlybonded to the synthetic interface,
+    # so NetworkManager should just ignore any SRIOV interfaces.
+    SUBSYSTEM=="net", DRIVERS=="hv_pci", ACTION=="add", ENV{NM_UNMANAGED}="1"
+    EOF
+    ```
 1. Ensure that the network service starts at boot time:
 
     ```bash
@@ -402,7 +415,20 @@ This section assumes that you've already obtained an ISO file from the Red Hat w
     ```bash
     sudo nmcli con mod eth0 connection.autoconnect yes ipv4.method auto
     ```
-
+    
+    > [!NOTE]
+    > When you use Accelerated Networking, the synthetic interface that's created must be configured to be unmanaged by using a udev rule. This action prevents `NetworkManager` from assigning the same IP to it as the primary interface. <br>
+    
+     To apply it:<br>
+    
+    ```
+    sudo cat <<EOF>> /etc/udev/rules.d/68-azure-sriov-nm-unmanaged.rules
+    # Accelerated Networking on Azure exposes a new SRIOV interface to the VM.
+    # This interface is transparentlybonded to the synthetic interface,
+    # so NetworkManager should just ignore any SRIOV interfaces.
+    SUBSYSTEM=="net", DRIVERS=="hv_pci", ACTION=="add", ENV{NM_UNMANAGED}="1"
+    EOF
+    ```
 1. Register your Red Hat subscription to enable the installation of packages from the RHEL repository:
 
     ```bash
@@ -834,7 +860,19 @@ This section shows you how to use KVM to prepare a [RHEL 6](#rhel-6-using-kvm) o
     PERSISTENT_DHCLIENT=yes
     NM_CONTROLLED=yes
     ```
-
+    > [!NOTE]
+    > When you use Accelerated Networking, the synthetic interface that's created must be configured to be unmanaged by using a udev rule. This action prevents `NetworkManager` from assigning the same IP to it as the primary interface. <br>
+    
+     To apply it:<br>
+    
+    ```
+    sudo cat <<EOF>> /etc/udev/rules.d/68-azure-sriov-nm-unmanaged.rules
+    # Accelerated Networking on Azure exposes a new SRIOV interface to the VM.
+    # This interface is transparentlybonded to the synthetic interface,
+    # so NetworkManager should just ignore any SRIOV interfaces.
+    SUBSYSTEM=="net", DRIVERS=="hv_pci", ACTION=="add", ENV{NM_UNMANAGED}="1"
+    EOF
+    ```
 1. Ensure that the network service starts at boot time:
 
     ```bash
@@ -1180,7 +1218,19 @@ This section assumes that you've already installed a RHEL VM in VMware. For info
     PERSISTENT_DHCLIENT=yes
     NM_CONTROLLED=yes
     ```
-
+    > [!NOTE]
+    > When you use Accelerated Networking, the synthetic interface that's created must be configured to be unmanaged by using a udev rule. This action prevents `NetworkManager` from assigning the same IP to it as the primary interface. <br>
+    
+     To apply it:<br>
+    
+    ```
+    sudo cat <<EOF>> /etc/udev/rules.d/68-azure-sriov-nm-unmanaged.rules
+    # Accelerated Networking on Azure exposes a new SRIOV interface to the VM.
+    # This interface is transparentlybonded to the synthetic interface,
+    # so NetworkManager should just ignore any SRIOV interfaces.
+    SUBSYSTEM=="net", DRIVERS=="hv_pci", ACTION=="add", ENV{NM_UNMANAGED}="1"
+    EOF
+    ```
 1. Ensure that the network service starts at boot time:
 
     ```bash
@@ -1450,6 +1500,13 @@ This section shows you how to prepare a RHEL 7 distro from an ISO by using a kic
     PERSISTENT_DHCLIENT=yes
     NM_CONTROLLED=yes
     EOF
+    
+    sudo cat <<EOF>> /etc/udev/rules.d/68-azure-sriov-nm-unmanaged.rules
+    # Accelerated Networking on Azure exposes a new SRIOV interface to the VM.
+    # This interface is transparentlybonded to the synthetic interface,
+    # so NetworkManager should just ignore any SRIOV interfaces.
+    SUBSYSTEM=="net", DRIVERS=="hv_pci", ACTION=="add", ENV{NM_UNMANAGED}="1"
+    EOF
 
     # Deprovision and prepare for Azure if you are creating a generalized image
     sudo cloud-init clean --logs --seed