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Hi all,
I am trying to install two LVS servers connected with Heartbeat. As
first step i installed just two servers and tested if pure LVS is
working. Strange, with identical setup, it works on one server, not on
another.
Here is setup:
both nodes are ubuntu 8.04
ipvsadm is installed from standard ubuntu repo (apt-get install ipvsadm)
I added following setup to /etc/rc.local
echo 1 > /proc/sys/net/ipv4/ip_forward
echo 0 > /proc/sys/net/ipv4/conf/all/send_redirects
echo 0 > /proc/sys/net/ipv4/conf/eth0/send_redirects
>From both LVS, I can reach real servers.
Here is LVS setup I am testing:
ipvsadm -C
ipvsadm -A -t 192.168.21.100:80 -s rr -p 900
ipvsadm -a -t 192.168.21.100:80 -r 192.168.20.1 -m -w 100
ipvsadm -a -t 192.168.21.100:80 -r 192.168.20.2 -m -w 100
ipvsadm -a -t 192.168.21.100:80 -r 192.168.20.3 -m -w 100
On one of nodes, it works withou any problem. On other one, it is not
working. Here is output from tcpdump (I am trying to connect to lvs on
address 192.168.21.100 from server 192.168.21.10).
root@ucplb-second-node:~# tcpdump -ln host 192.168.21.10
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
06:13:54.197763 arp who-has 192.168.21.100 tell 192.168.21.10
06:13:54.198226 arp reply 192.168.21.100 is-at 00:50:56:92:4d:a2
06:13:54.197809 IP 192.168.21.10.46204 > 192.168.21.100.80: S
3085705580:3085705580(0) win 5840 <mss 1460,sackOK,timestamp 1070655
0,nop,wscale 5>
06:13:54.197867 IP 192.168.21.10.46204 > 192.168.20.3.80: S
3085705580:3085705580(0) win 5840 <mss 1460,sackOK,timestamp 1070655
0,nop,wscale 5>
06:13:57.186597 IP 192.168.21.10.46204 > 192.168.21.100.80: S
3085705580:3085705580(0) win 5840 <mss 1460,sackOK,timestamp 1070955
0,nop,wscale 5>
06:13:57.186645 IP 192.168.21.10.46204 > 192.168.20.3.80: S
3085705580:3085705580(0) win 5840 <mss 1460,sackOK,timestamp 1070955
0,nop,wscale 5>
06:14:03.186451 IP 192.168.21.10.46204 > 192.168.21.100.80: S
3085705580:3085705580(0) win 5840 <mss 1460,sackOK,timestamp 1071555
0,nop,wscale 5>
06:14:03.186489 IP 192.168.21.10.46204 > 192.168.20.3.80: S
3085705580:3085705580(0) win 5840 <mss 1460,sackOK,timestamp 1071555
0,nop,wscale 5>
Any idea what might cause the problem. I am very confused since I
literally copied configuration from another node where it works. Any
idea how to troubleshoot this ?
Thank you in advance.
Dusan
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