fix: ensure that ipv6 is not disabled in kernel

Signed-off-by: Natanael Copa <ncopa@mirantis.com>
cloudnativelabs · Jun 16, 2024 · a1125f6 · a1125f6
1 parent f042d08
commit a1125f6
Show file tree

Hide file tree

Showing 2 changed files with 9 additions and 0 deletions.
diff --git a/pkg/controllers/routing/network_routes_controller.go b/pkg/controllers/routing/network_routes_controller.go
@@ -1494,6 +1494,14 @@ func NewNetworkRoutingController(clientset kubernetes.Interface,
 	}
 	nrc.isIPv6Capable = len(nrc.nodeIPv6Addrs) > 0
 
+	if kubeRouterConfig.EnableIPv6 {
+		sysctlErr := utils.SetSysctl(utils.IPv6ConfAllDisableIPv6, 0)
+		if sysctlErr != nil {
+			klog.Errorf("Failed to set /proc/sys/net/ipv6/conf/all/disable_ipv6. IPv6 may "+
+				"not work: %s", sysctlErr.Error())
+		}
+	}
+
 	switch {
 	case kubeRouterConfig.RouterID == "generate":
 		h := fnv.New32a()

diff --git a/pkg/utils/sysctl.go b/pkg/utils/sysctl.go
@@ -15,6 +15,7 @@ const (
 	IPv4IPVSConnReuseMode    = "net/ipv4/vs/conn_reuse_mode"
 	IPv4ConfAllArpIgnore     = "net/ipv4/conf/all/arp_ignore"
 	IPv4ConfAllArpAnnounce   = "net/ipv4/conf/all/arp_announce"
+	IPv6ConfAllDisableIPv6   = "net/ipv6/conf/all/disable_ipv6"
 
 	// Network Routes Configuration Paths
 	BridgeNFCallIPTables  = "net/bridge/bridge-nf-call-iptables"