Hi Aleks,
I setup openshift origin cluster with 1lb + 3 masters + 5 nodes. In some nodes, pods running on them couldn't be reached by other nodes or pods running on other nodes. It indicates "no route to host". [root@host-10-1-130-32 ~]# curl -kv docker-registry.default.svc.cluster.local:5000 * About to connect() to docker-registry.default.svc.cluster.local port 5000 (#0) * Trying 172.30.22.28... * No route to host * Failed connect to docker-registry.default.svc.cluster.local:5000; No route to host * Closing connection 0 curl: (7) Failed connect to docker-registry.default.svc.cluster.local:5000; No route to host And other nodes works fine. In my previous mail, host name of node is host-10-1-130-32. Output of "ifconfig tun0" is as below, [root@host-10-1-130-32 ~]# ifconfig tun0 tun0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1450 inet 10.130.2.1 netmask 255.255.254.0 broadcast 0.0.0.0 inet6 fe80::cc50:3dff:fe07:9ea2 prefixlen 64 scopeid 0x20<link> ether ce:50:3d:07:9e:a2 txqueuelen 1000 (Ethernet) RX packets 97906 bytes 8665783 (8.2 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 163379 bytes 27405744 (26.1 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 I also tried to capture packet via tcpdump, and found some stuff as following, 10.1.130.32.58147 > 10.1.236.92.4789: [no cksum] VXLAN, flags [I] (0x08), vni 0 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 10.128.1.45 tell 10.130.2.1, length 28 0x0000: 04f9 38ae 659b fa16 3e6c dd90 0800 4500 ..8.e...>l....E. 0x0010: 004e 543c 4000 4011 63e4 0a01 8220 0a01 .NT<@.@.c....... 0x0020: ec5c e323 12b5 003a 0000 0800 0000 0000 .\.#...:........ 0x0030: 0000 ffff ffff ffff ce50 3d07 9ea2 0806 .........P=..... 0x0040: 0001 0800 0604 0001 ce50 3d07 9ea2 0a82 .........P=..... 0x0050: 0201 0000 0000 0000 0a80 012d ...........- 25 00:22:47.214387 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 10.1.130.2 tell 10.1.130.45, length 46 0x0000: ffff ffff ffff fa16 3e5a a862 0806 0001 ........>Z.b.... 0x0010: 0800 0604 0001 fa16 3e5a a862 0a01 822d ........>Z.b...- 0x0020: 0000 0000 0000 0a01 8202 0000 0000 0000 ................ 0x0030: 0000 0000 0000 0000 0000 0000 ............ 26 00:22:47.258344 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 24) :: > ff02::1:ffa1:1fbb: [icmp6 sum ok] ICMP6, neighbor solicitation, length 24, who has fe80::824:c2ff:fea1:1fbb 0x0000: 3333 ffa1 1fbb 0a24 c2a1 1fbb 86dd 6000 33.....$......`. 0x0010: 0000 0018 3aff 0000 0000 0000 0000 0000 ....:........... 0x0020: 0000 0000 0000 ff02 0000 0000 0000 0000 ................ 0x0030: 0001 ffa1 1fbb 8700 724a 0000 0000 fe80 ........rJ...... 0x0040: 0000 0000 0000 0824 c2ff fea1 1fbb .......$...... 27 00:22:47.282619 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 10.1.130.2 tell 10.1.130.73, length 46 0x0000: ffff ffff ffff fa16 3ec4 a9be 0806 0001 ........>....... 0x0010: 0800 0604 0001 fa16 3ec4 a9be 0a01 8249 ........>......I 0x0020: 0000 0000 0000 0a01 8202 0000 0000 0000 ................ 0x0030: 0000 0000 0000 0000 0000 0000 ............ I didn't understand why the IP marked in red above were involved. Thanks, Jared, (韦煜) Software developer Interested in open source software, big data, Linux ________________________________ From: Aleksandar Lazic <al...@me2digital.eu> Sent: Monday, October 23, 2017 2:34:13 AM To: Yu Wei; users@lists.openshift.redhat.com; d...@lists.openshift.redhat.com Subject: Re: Network issues with openvswitch Hi Yu Wei. on Sonntag, 22. Oktober 2017 at 19:13 was written: > Hi, > I execute following command on work node of openshift origin cluster 3.6. > > [root@host-10-1-130-32 ~]# traceroute docker-registry.default.svc > traceroute to docker-registry.default.svc (172.30.22.28), 30 hops max, 60 > byte packets > 1 bogon (10.130.2.1) 3005.715 ms !H 3005.682 ms !H 3005.664 ms !H > It seemed content marked in red should be hostname of work node. > How could I debug such issue? Where to start? What's the hostname of the node? I'm not sure what you try to debug or what's the problem you try to solve? > Thanks, > Jared, (韦煜) > Software developer > Interested in open source software, big data, Linux -- Best Regards Aleks
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