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Hi all
thanx in advance for helping(urgent help needed)
we are a group of 2 students working on LVS impelemtation as a part of final
year project.
We have succesfully implemented the LVS NAT a month ago and since then we have
been
struggling to implement LVS TUN and LVS DR.
Can some one please help us with LVS DR ???
This is real long letter please have some patience i have made sure i have not
missed out on even the smallest of things.
OK here is the test bed
All Systems are Redhat 9 Based Running with a updated Kernal vs 2.4.20 (support
for LVS)
All Packages running have been installed with packages downloaded from the
Ultra monkey web Site
heartbeat, ldiretord, ipvsadm running succesfully.
1 Director
2 Real Servers (web server running on it)
1 Client
Client
=======
eth0 CIP=192.168.3.2
Director
========
eth0 VIP=192.168.3.146 (Virtual IP in the subnet of the client)
eth1 DIP=192.168.1.146 (Virtual IP in the subnet of the Real Servers)
Realservers
============
Real server 1
eth0 192.168.1.145 (Real server on which the web server is running)
eth1 192.168.3.145 (for the response to reach the client)
lo:0 192.168.3.146
Real server 2
eth0 192.168.1.147 (Real server on which the web server is running)
eth1 192.168.3.147 (for the response to reach the client)
lo:0 192.168.3.146
Topology
========
_________
| Client |
|_________|
_LAN__________| eth0 192.168.3.2 (CIP)
| |
| |
| | eth0 192.168.3.146 (VIP)
| ____|____
| |Director |
| |_________|
| | eth1 192.168.1.146 (DIP)
| |
| |
| |
| _____|_________________
| | eth0 192.168.1.145 | eth0 192.168.1.147
| ____|_____ ___ _____
| | Real | | Real |
| | Server 1 | | Server 2 |
| ---------------- ----------------
| | eth1 192.168.3.145 | eth1 192.168.3.145
| | |
| |______________________|
| |
| |
|_______LAN__________ |
The eth0 interfaces of Director & Real servers are connected through a hub
i.e 192.168.1.145 192.168.1.146 192.168.1.147
and all the eth1 interfaces (except client) are connected to the internal
network to which the client is connected (the client has only one interface)
No routers present !!!!!!!!!!!
Things we have done
1) Configured the lDirector with DR configuration
2) Configured the web servers on both real servers
3) Enabled IP fwd on both the real servers
IP forwarding is not needed on the Linux Director ???.
Problem
=======
when a Request is sent from the client to the VIP.
The error "Page cannot be displayed " is encountered
Director#
when we type the command 'ipvsadm -L --stats'
Based on the output we can see that the director is receiving packets and load
balancing is also being done.
The connections are distributed between the real servers, we can see the
received Bytes BUT the SENT BYTES column is always zero no matter how many
conections are recieved
Assumptions
===========
Based on the output we are assuming that the realservers are recieving the
packets
But we are not sure whether the packets are being processed by the Real servers
or there is a problem with the request reaching back the client.
we are not sure what GATEWAYS to be specified ???
ARP PRoblem
===========
we have created a lo:0 VIP interface on the real servers so that the packets
appear local and are processed.
we have PROBABLY hidded the lo:0 interfaces on both the real servers
we have actually created the config files for lo:0
and then used the commands
echo "1" > /proc/sys/net/ipv4/conf/all/hidden
echo "1" > /proc/sys/net/ipv4/conf/lo/hidden
which should have solved the problem.
but we are not sure whether the arp patch is set up or not
Does the kernal i have is already patched with the noarp patch ????
i haved tried typing 'lsmod'
the output had nothing called noarp module
i have tried 'insmod noarp'
which said module not found
HELP US
=======
We would be grateful if someone could help us because we are in a very troubled
state as we need to complete the project in a week's time
We want to know
1) what GATEWAYS to be specified on which machines ???
2) Clarity on the noarp mod and hidding the lo:0 interfaces
3) how to route back the request to the client
PS: we would be even more grateful if u can mail back us with a solution at any
one of the following addresses
harsha040@xxxxxxxxx
pradeepnair83@xxxxxxxxx
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