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<@[email protected].......
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 <[email protected]>
Sent: Monday, October 23, 2017 2:34:13 AM
To: Yu Wei; [email protected]; [email protected]
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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