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Hi,
I hope this is the right place for this question because I tried other
places and no response from people so this is my last resort I guess.
I'm looking for someone with experience with Syncdaemon IPVS and the
piranha package.
I'm trying to build a loadbalancer with session information synchronized
between the hosts.
The problem is that I don't see the session information on the backup node
(server-b) with the command ipvsadm -Lcn
The config:
--- LVS.CF ---
serial_no = 19
primary = <IP server-a>
service = lvs
backup_active = 1
backup = <IP server-b>
heartbeat = 1
heartbeat_port = 539
keepalive = 6
deadtime = 18
network = direct
debug_level = NONE
monitor_links = 1
syncdaemon = 1
syncd_iface = eth0
syncd_id = 1
virtual http {
active = 1
address = <VIP_IP> eth0:1
vip_nmask = 255.255.255.255
port = 80
send = "GET / HTTP/1.0\r\n\r\n"
expect = "HTTP"
use_regex = 0
load_monitor = none
scheduler = rr
protocol = tcp
timeout = 6
reentry = 15
quiesce_server = 0
persistent = 120
server server-a {
address = <IP server-a>
active = 1
weight = 1
}
server server-b {
address = <IP server-b>
active = 1
weight = 1
}
}
--- LVS.CF ---
On the backup node i see with netstat -tulpen:
udp 0 0 224.0.0.81:8848 0.0.0.0:*
>From the documentation I know it's multicast udp.
A TCP dump shows me that server-a is sending packages:
[root@server-a ~]# tcpdump -ni eth0 host 224.0.0.81
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
16:24:29.726138 IP server-a.54366 > 224.0.0.81.8848: UDP, length 100
16:24:35.726112 IP server-a.54366 > 224.0.0.81.8848: UDP, length 100
16:24:36.726189 IP server-a.54366 > 224.0.0.81.8848: UDP, length 100
16:24:37.726128 IP server-a.54366 > 224.0.0.81.8848: UDP, length 100
[root@server-b ~]# tcpdump -ni eth0 host 224.0.0.81
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
16:24:30.177808 IP server-a.54366 > 224.0.0.81.8848: UDP, length 100
16:24:36.177817 IP server-a.54366 > 224.0.0.81.8848: UDP, length 100
16:24:37.177847 IP server-a.54366 > 224.0.0.81.8848: UDP, length 100
16:24:38.177760 IP server-a.54366 > 224.0.0.81.8848: UDP, length 100
Server-b get the traffic on it's interface but does nothing with it.
ipvsadm -Lcn on server-a show a list with information but on server-b
nothing but documentation states that it should and there is a kernel
thread running called [ipvs_syncbackup].
A strace of the pulse process on server-b shows only the polling of server-a.
So what am I missing here? I hope somebody has a clue.
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