Environment
- Dubbo version: 2.7.5
- Operating System version: CentOS 7.7 (K8S v1.16.6)
- Java version: 1.8
Steps to reproduce this issue
- Use multicast Registry, address:
multicast://224.5.6.7:1234
- Start up application
Expected Result
Application start up succeed.
Actual Result
Application start up failed, stack trace
java.lang.IllegalStateException: Network is unreachable (sendto failed)
at org.apache.dubbo.registry.multicast.MulticastRegistry.multicast(MulticastRegistry.java:238)
at org.apache.dubbo.registry.multicast.MulticastRegistry.doRegister(MulticastRegistry.java:257)
at org.apache.dubbo.registry.support.FailbackRegistry.register(FailbackRegistry.java:240)
at org.apache.dubbo.registry.multicast.MulticastRegistry.register(MulticastRegistry.java:377)
at org.apache.dubbo.registry.ListenerRegistryWrapper.register(ListenerRegistryWrapper.java:57)
at org.apache.dubbo.registry.integration.RegistryProtocol.doRefer(RegistryProtocol.java:412)
at org.apache.dubbo.registry.integration.RegistryProtocol.refer(RegistryProtocol.java:396)
at org.apache.dubbo.rpc.protocol.ProtocolListenerWrapper.refer(ProtocolListenerWrapper.java:70)
at org.apache.dubbo.qos.protocol.QosProtocolWrapper.refer(QosProtocolWrapper.java:73)
at org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper.refer(ProtocolFilterWrapper.java:151)
at org.apache.dubbo.rpc.Protocol$Adaptive.refer(Protocol$Adaptive.java)
at org.apache.dubbo.config.ReferenceConfig.createProxy(ReferenceConfig.java:324)
at org.apache.dubbo.config.ReferenceConfig.init(ReferenceConfig.java:266)
at org.apache.dubbo.config.ReferenceConfig.get(ReferenceConfig.java:151)
Here's network interfaces
> ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.40.116 netmask 255.255.240.0 broadcast 192.168.47.255
inet6 fe80::216:3eff:fe16:3eec prefixlen 64 scopeid 0x20<link>
ether 00:16:3e:16:3e:ec txqueuelen 1000 (Ethernet)
RX packets 958592 bytes 1408986475 (1.3 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 56904 bytes 4593937 (4.3 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 1698 bytes 7096626 (6.7 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1698 bytes 7096626 (6.7 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0> ifconfig -a
dummy0: flags=130<BROADCAST,NOARP> mtu 1500
ether 7e:7f:fe:1a:8f:23 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.40.116 netmask 255.255.240.0 broadcast 192.168.47.255
inet6 fe80::216:3eff:fe16:3eec prefixlen 64 scopeid 0x20<link>
ether 00:16:3e:16:3e:ec txqueuelen 1000 (Ethernet)
RX packets 958636 bytes 1408991887 (1.3 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 56941 bytes 4600900 (4.3 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
kube-ipvs0: flags=130<BROADCAST,NOARP> mtu 1500
inet 172.21.0.1 netmask 255.255.255.255 broadcast 172.21.0.1
ether 7e:61:57:a0:de:b3 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 1813 bytes 7104868 (6.7 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1813 bytes 7104868 (6.7 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0The reason is that interface kube-ipvs0 is not UP, but was set to MulticastSocket in org.apache.dubbo.common.utils.NetUtils#setInterface method.
Should use validNetworkInterfaces
@@ -471,10 +471,8 @@ public class NetUtils {
public static void setInterface(MulticastSocket multicastSocket, boolean preferIpv6) throws IOException {
boolean interfaceSet = false;
- Enumeration interfaces = NetworkInterface.getNetworkInterfaces();
- while (interfaces.hasMoreElements()) {
- NetworkInterface i = (NetworkInterface) interfaces.nextElement();
- Enumeration addresses = i.getInetAddresses();
+ for (NetworkInterface networkInterface : getValidNetworkInterfaces()) {
+ Enumeration addresses = networkInterface.getInetAddresses();
while (addresses.hasMoreElements()) {
InetAddress address = (InetAddress) addresses.nextElement();
if (preferIpv6 && address instanceof Inet6Address) {or just check UP flag
@@ -474,6 +474,9 @@ public class NetUtils {
Enumeration interfaces = NetworkInterface.getNetworkInterfaces();
while (interfaces.hasMoreElements()) {
NetworkInterface i = (NetworkInterface) interfaces.nextElement();
+ if (!i.isUp()) {
+ continue;
+ }
Enumeration addresses = i.getInetAddresses();
while (addresses.hasMoreElements()) {
InetAddress address = (InetAddress) addresses.nextElement();
Environment
Steps to reproduce this issue
multicast://224.5.6.7:1234Expected Result
Application start up succeed.
Actual Result
Application start up failed, stack trace
Here's network interfaces
The reason is that interface
kube-ipvs0is notUP, but was set toMulticastSocketinorg.apache.dubbo.common.utils.NetUtils#setInterfacemethod.Should use validNetworkInterfaces
or just check
UPflag