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Hi,
thanx for this greate tool called "LVS".
I have a question about a problem we experiment on our cluster.
We use ipvs-0.9.7 and Linux 2.2.11 on a cluster of six nodes, one
director and
5 real servers.
We configured the cluster as a virtual web server using the folowing
script on the
director :
#!/bin/bash
ipchains -F
ipvsadm -C
ifconfig eth1:0 192.168.7.100 netmask 255.255.255.255 broadcast
192.168.7.100 up
route add -host 192.168.7.100 dev eth1:0
ipvsadm -A -t 192.168.7.100:80 -s rr
rsh c2n3 /sbin/modprobe ipip
rsh c2n3 /sbin/ifconfig tunl0 192.168.7.100 netmask 255.255.255.255
broadcast 192.168.7.100 up
rsh c2n3 /sbin/route add -host 192.168.7.100 dev tunl0
rsh c2n3 /sbin/modprobe de4x5
rsh c2n3 /sbin/ifconfig eth1 192.168.1.122 netmask 255.255.255.0
broadcast 192.168.1.255 up
rsh c2n3 /sbin/route add -net 192.168.1.0 netmask 255.255.255.0 dev eth1
ipvsadm -a -t 192.168.7.100:80 -R 192.168.7.3:80 -i
rsh c2n3 /usr/sbin/httpd -d /cluster/server/etc/httpd
rsh c2n4 /sbin/modprobe ipip
rsh c2n4 /sbin/ifconfig tunl0 192.168.7.100 netmask 255.255.255.255
broadcast 192.168.7.100 up
rsh c2n4 /sbin/route add -host 192.168.7.100 dev tunl0
rsh c2n4 /sbin/modprobe de4x5
rsh c2n4 /sbin/ifconfig eth1 192.168.1.123 netmask 255.255.255.0
broadcast 192.168.1.255 up
rsh c2n4 /sbin/route add -net 192.168.1.0 netmask 255.255.255.0 dev eth1
ipvsadm -a -t 192.168.7.100:80 -R 192.168.7.4:80 -i
rsh c2n4 /usr/sbin/httpd -d /cluster/server/etc/httpd
rsh c2n5 /sbin/modprobe ipip
rsh c2n5 /sbin/ifconfig tunl0 192.168.7.100 netmask 255.255.255.255
broadcast 192.168.7.100 up
rsh c2n5 /sbin/route add -host 192.168.7.100 dev tunl0
rsh c2n5 /sbin/modprobe de4x5
rsh c2n5 /sbin/ifconfig eth1 192.168.1.124 netmask 255.255.255.0
broadcast 192.168.1.255 up
rsh c2n5 /sbin/route add -net 192.168.1.0 netmask 255.255.255.0 dev eth1
ipvsadm -a -t 192.168.7.100:80 -R 192.168.7.5:80 -i
rsh c2n5 /usr/sbin/httpd -d /cluster/server/etc/httpd
rsh c2n6 /sbin/modprobe ipip
rsh c2n6 /sbin/ifconfig tunl0 192.168.7.100 netmask 255.255.255.255
broadcast 192.168.7.100 up
rsh c2n6 /sbin/route add -host 192.168.7.100 dev tunl0
rsh c2n6 /sbin/modprobe de4x5
rsh c2n6 /sbin/ifconfig eth1 192.168.1.125 netmask 255.255.255.0
broadcast 192.168.1.255 up
rsh c2n6 /sbin/route add -net 192.168.1.0 netmask 255.255.255.0 dev eth1
ipvsadm -a -t 192.168.7.100:80 -R 192.168.7.6:80 -i
rsh c2n6 /usr/sbin/httpd -d /cluster/server/etc/httpd
rsh c2n7 /sbin/modprobe ipip
rsh c2n7 /sbin/ifconfig tunl0 192.168.7.100 netmask 255.255.255.255
broadcast 192.168.7.100 up
rsh c2n7 /sbin/route add -host 192.168.7.100 dev tunl0
rsh c2n7 /sbin/modprobe de4x5
rsh c2n7 /sbin/ifconfig eth1 192.168.1.126 netmask 255.255.255.0
broadcast 192.168.1.255 up
rsh c2n7 /sbin/route add -net 192.168.1.0 netmask 255.255.255.0 dev eth1
ipvsadm -a -t 192.168.7.100:80 -R 192.168.7.7:80 -i
rsh c2n7 /usr/sbin/httpd -d /cluster/server/etc/httpd
You can see here that the virtual server IP is 192.168.7.100 and that we
use the tunneling method.
You can also see that we use "rsh" to remote configure the nodes from
the director.
We have two physical networks, the external network (192.168.1.0) and
the internal (192.168.7.0).
The director has eth0 on the external network and eth1 on the internal.
The nodes have eth0 on the internal
network and eth1 on the external.
When we use a benchmark program we wrote to generate a lot of http
queries, everything works fine
during our, great tool.
But now we want to delete a node from the service by issuing the command
on the
director while our bench is running :
ipvsadm -d -t 192.168.7.100:80 -R 192.168.7.5:80
Here we want to delete the node 5.
Immediatelly, the service stops on all nodes, the director seem to hang,
only for the
ipvs part of the system, everything else seem to work normally.
This is nearly the same if we add a node. When we add it it is never
used by the director.
When we delete a node we see with ipvsadm -l that it is really deleted.
When we add a node we see that it is really added.
So several questions :
did we correctly configure the service ?
do we use a correct kernel version for the ipvs-0.9.7 ?
do you think that adding/deletting realservers while the service is
running should work ?
Thanx for any help. Thanx again for your work.
Hugo Delchini.
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