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Hi all
I just signed up to the list since I have been having problems with getting
LVS-DR to work for days now.
Let me start by describing my setup:
2 hardware servers on the same lan.
I want 2 directors and 2 real servers.
So I have 1 director and 1 real server on each hardware box.
This corresponds to the example at:
http://www.ultramonkey.org/3/topologies/sl-ha-lb-eg.html
When following that guide everything works just as they describe it, except for
one step:
TCP 192.168.6.240:80 rr
-> 192.168.6.4:80 Route 1 0 0
-> 192.168.6.5:80 Route 1 0 0
Is how their ipvs table look like. Now if I look at my own table it looks like
this:
TCP 192.168.100.35:80 rr
-> 192.168.100.32:80 Local 1 0 0
-> 192.168.100.31:80 Route 1 0 0
As you can see the realserver 192.168.100.32:80 is listed as Local. Which DO
make sence since that realserver is local to the director im issuing the
command on.
Now here comes the problem: If I try to connect to the service, it works 50% of
the time. If it hits the Local realserver everything works, but the other 50%
of the attemps it tries the other real server, and that just fails.
So it appears the director for some reason cant forward the packets to the
other box. The same behavior occurs if I make the other director active. The
local realserver works, the remote doesn't.
C:\Documents and Settings\me>telnet 192.168.100.35 25
Connecting To 192.168.100.35...Could not open connection to the host, on port 25
: Connect failed
That's how it looks if I try to telnet to the smtp port from a windows machine
on the same lan. IF I try again I get the smtp banner of the realserver running
on the same machine as the director.
When connections fails the InActConn increments 1. And when they work
ActiveConn does the same.
tcp 0 0 0.0.0.0:23 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN
As you can see ports should be open on all ip's.
I tried making the setup more simple by creating a simple telnet service with
only 1 realserver, running on a remote box. That gives the same behavior,
Connect failed. It just happens everytime since there is no local node. (I
followed these steps:
#setup servers for telnet, LVS-DR
director:/etc/lvs# /sbin/ipvsadm -A -t 192.168.100.35:23 -s rr
director:/etc/lvs# echo "adding service 23 to realserver 192.168.100.31 "
director:/etc/lvs# /sbin/ipvsadm -a -t 192.168.100.35:23 -R 192.168.100.31 -g
-w 1
Taking from http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.LVS-DR.html
So basically that's my problem; That the routing part of LVS-DR doesn't appear
to be working.
Now for some extended info on what I am running:
Both machines are identical virtual machines running on 2 different host
machines on the same lan.
They are both installed as Debian etch with debian stock kernel 2.6.18-4-686
This is the content of the two /etc/network/interfaces:
auto lo
iface lo inet loopback
auto lo:0
iface lo:0 inet static
address 192.168.100.35
netmask 255.255.255.255
pre-up sysctl -p > /dev/null
# The primary network interface
auto eth0
iface eth0 inet static
address 192.168.100.31
netmask 255.255.255.0
gateway 192.168.100.254
And the other server
auto lo
iface lo inet loopback
auto lo:0
iface lo:0 inet static
address 192.168.100.35
netmask 255.255.255.255
pre-up sysctl -p > /dev/null
# The primary network interface
auto eth0
iface eth0 inet static
address 192.168.100.32
netmask 255.255.255.0
gateway 192.168.100.254
The /etc/sysctl.conf file is also identical on both machines. These are the
settings changed in there:
et.ipv4.conf.default.forwarding = 1
net.ipv4.ip_forward = 1
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.eth0.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.eth0.arp_announce = 2
I am running ldirectord version 2.0.7-2 but I don't think this is related to
ldirector.
I am running heartbeat version 2.0.7-2 but I don't think this is related to
heartbeat
All software / kernels /modules are debian stock installs, so nothing have been
compiled from tarballs.
The above is all the information I could imagine being helpful in debugging the
problem, if I left out something just let me know.
Med venlig hilsen / Best regards
Jonas Akrouh Larsen
TechBiz ApS
Laplandsgade 4, 2. sal
2300 København S
Office: 7020 0979
Direct: 33369974
Fax: 7020 0978
Mobile: 51201096
Web: www.techbiz.dk <http://www.techbiz.dk/>
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