update flannel v0.24.2

addons/flannel/0.24.2/flannel-ethtool.service

@@ -0,0 +1,12 @@
+[Unit]
+Description=Disable vxlan checksum offloading for flannel.1
+After=sys-devices-virtual-net-flannel.1.device
+Requires=sys-devices-virtual-net-flannel.1.device
+
+[Service]
+Type=oneshot
+ExecStart=/sbin/ethtool -K flannel.1 tx-checksum-ip-generic off
+RemainAfterExit=yes
+
+[Install]
+WantedBy=sys-devices-virtual-net-flannel.1.device

addons/flannel/0.24.2/install.sh

@@ -151,10 +151,43 @@ function flannel() {
        kubectl rollout restart --namespace=kube-flannel daemonset/kube-flannel-ds
     fi
 
+    if flannel_detect_vmware_nic; then
+        flannel_install_ethtool_service "$src"
+    fi
+
     flannel_ready_spinner
     check_network
 }
 
+function flannel_detect_vmware_nic() {
+    if lspci -v | grep Ethernet | grep -q "VMware VMXNET3"; then
+        return 0
+    fi
+    return 1
+}
+
+
+function flannel_install_ethtool_service() {
+    # this disables the tcp checksum offloading on flannel interface - this is a workaround for
+    # certain VMWare NICs that use NSX and have a conflict with the way the checksum is handled by
+    # the kernel.
+    local src="$1"
+
+    logStep "Installing flannel ethtool service"
+    logStep "Disabling TCP checksum offloading on flannel interface for VMWare VMXNET3 NICs"
+
+    cp "$src/flannel-ethtool.service" /etc/systemd/system/flannel-ethtool.service
+
+    systemctl daemon-reload
+    systemctl enable flannel-ethtool.service
+    if ! timeout 30s systemctl start flannel-ethtool.service; then
+        log "Failed to start flannel-ethtool.service within 30s, restarting it"
+        systemctl restart flannel-ethtool.service
+    fi
+
+    logSuccess "Flannel ethtool service installed"
+}
+
 function flannel_init_pod_subnet() {
     POD_CIDR="$FLANNEL_POD_CIDR"
     POD_CIDR_RANGE="$FLANNEL_POD_CIDR_RANGE"

addons/flannel/template/base/install.sh

@@ -160,23 +160,20 @@ function flannel() {
 }
 
 function flannel_detect_vmware_nic() {
-    local vmxnet3=false
-
     if lspci -v | grep Ethernet | grep -q "VMware VMXNET3"; then
-        vmxnet3=true
+        return 0
     fi
-
-    return $vmxnet3
+    return 1
 }
 
-
 function flannel_install_ethtool_service() {
     # this disables the tcp checksum offloading on flannel interface - this is a workaround for
     # certain VMWare NICs that use NSX and have a conflict with the way the checksum is handled by
     # the kernel.
     local src="$1"
 
     logStep "Installing flannel ethtool service"
+    logStep "Disabling TCP checksum offloading on flannel interface for VMWare VMXNET3 NICs"
 
     cp "$src/flannel-ethtool.service" /etc/systemd/system/flannel-ethtool.service