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Hi,
we just implemented a 2nd director for our HA LVS environment and we
want to do connection synchronization between the master and the backup
director through ipvsadm
On both servers we added the multicast route:
Destination Gateway Genmask Flags Metric Ref Use
Iface
BASE-ADDRESS.MC * 240.0.0.0 U 0 0 0 eth0
On the master director we we started the synchronzation daemon:
ipvsadm --startdaemon=master --mcast-interface=eth0
On the backup director we started the synchronization daemon:
ipvsadm --startdaemon=backup --mcast-interface=eth0
Both directors are running the following versions of ipvsadm:
ipvsadm v1.24 2003/06/07 (compiled with getopt_long and IPVS v1.2.0)
We see multicasts of ipvsadm sync daemon:
master:~ # tcpdump multicast -i eth0 -n -p
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
18:37:12.084243 IP x.x.x.x.45605 > 224.0.0.81.8848: UDP, length: 628
18:37:13.083984 IP x.x.x.x.45605 > 224.0.0.81.8848: UDP, length: 28
18:37:14.083902 IP x.x.x.x.45605 > 224.0.0.81.8848: UDP, length: 52
slave:~ # tcpdump multicast -i eth0 -n -p
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
18:34:37.105027 IP x.x.x.x.45605 > 224.0.0.81.8848: UDP, length: 28
18:34:38.104901 IP x.x.x.x.45605 > 224.0.0.81.8848: UDP, length: 100
18:34:39.104788 IP x.x.x.x.45605 > 224.0.0.81.8848: UDP, length: 268
18:34:40.104692 IP x.x.x.x.45605 > 224.0.0.81.8848: UDP, length: 100
We also see the transfer of the connections on the backup:
slave:~ # ipvsadm -lcn | wc -l
1479
However the routing table remains emtpy on the slave director:
lummi:~ # ipvsadm -ln
IP Virtual Server version 1.2.0 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP x.x.x19:25 wlc
-> x.x.x9:25 Route 1 0 0
-> x.x.x8:25 Route 1 0 0
TCP x.x.x18:80 wlc
-> x.x.x5:80 Route 1 0 0
-> x.x.x4:80 Route 1 0 0
TCP x.x.x20:636 wlc
-> x.x.x14:636 Route 1 0 0
-> x.x.x15:636 Route 1 0 0
TCP x.x.x21:636 wlc
-> x.x.x7:636 Route 1 0 0
-> x.x.x13:636 Route 1 0 0
TCP x.x.x20:389 wlc
-> x.x.x14:389 Route 1 0 0
-> x.x.x15:389 Route 1 0 0
TCP x.x.x21:389 wlc
-> x.x.x7:389 Route 1 0 0
-> x.x.x13:389 Route 1 0 0
TCP x.x.x19:143 wlc
-> x.x.x9:143 Route 1 0 0
-> x.x.x8:143 Route 1 0 0
TCP x.x.x18:443 wlc persistent 3600
-> x.x.x5:443 Route 1 0 0
-> x.x.x4:443 Route 1 0 0
TCP x.x.x19:465 wlc
-> x.x.x9:465 Route 1 0 0
-> x.x.x8:465 Route 1 0 0
TCP x.x.x19:993 wlc
-> x.x.x9:993 Route 1 0 0
-> x.x.x8:993 Route 1 0 0
Questions:
1) Should the backup server list connections its received?
2) If not, how do I verify that it's updated its internal tables?
3) Does it work if I always run both a master and a slave sync daemon at the
same time on both directors, even if ipvsadm is only running on the master?
Regards,
Sebastiaan Veldhuisen
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