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----- Original Message -----
Sent: Thursday, October 18, 2001 12:58 PM
Subject: ipvs / LVS-DR / LVS-TUN problems
Nope, didn't work.
If you could, could you tell us why you use the
commands you do?
Not being knowledgable about what the route command
does, is not helping here.
>
>On Tue, 16 Oct 2001 listgetter@xxxxxxxx
wrote:
>
>> Here is our situation:
>> We have a network
block of public ip's that range from x.x.x.128 to
>>
x.x.x.159.
>> We are wanting to setup LVS-TUN so we can distribute the
load of our
>> website between two machines.
>> Which the
first machine, the director, is going to be a local
node.
>>
>> gargamel: running with kernel 2.4.12, IP =
x.x.x.155, running ipvsadm
>> software.
>>
>>
smurfette: running with kernel 2.4.5, IP = x.x.x.147
>>
>>
Both machines have been patched with linux-2.4.5-ipvs-0.8.1.patch.gz
and
>> hidden-2_4_5-1_diff.
>>
>> The first way we
set it up was this:
>>
>> Director Setup
>> gargamel#
/sbin/ipvsadm -A -t x.x.x.155:80 -s wlc
>> gargamel# /sbin/ipvsadm -a
-t x.x.x.155:80 -r 127.0.0.1 -i -w 1
>> gargamel# /sbin/ipvsadm -a -t
x.x.x.155:80 -r x.x.x.147 -i -w 1
>> gargamel# echo 1 >
/proc/sys/net/ipv4/ip_forward
>
>It is wrong to configure the
following block.
>
>====>BEGIN-OF-BLOCK
>> gargamel#
/sbin/insmod ipip
>> gargamel# /sbin/ifconfig tunl0 x.x.x.155 netmask
255.255.255.224 broadcast
>> x.x.x.159 up
>> gargamel#
/sbin/route add -host x.x.x.155 dev tunl0
>> gargamel# echo 1 >
/proc/sys/net/ipv4/conf/all/hidden
>> gargamel# echo 1 >
/proc/sys/net/ipv4/conf/tunl0/hidden
>====>END-OF-BLOCK
>
>Do
the following command instead
>
>ifconfig eth0:1 x.x.x.155 netmask
255.255.255.255 broadcast x.x.x.159 up
Why do we need to set this up?
What purpose will
this device serve?
>
>>
>> Real Server
Setup
>> smurfette# echo 1 >
/proc/sys/net/ipv4/ip_forward
>> smurfette# /sbin/insmod
ipip
>> smurfette# /sbin/ifconfig tunl0 x.x.x.147 netmask
255.255.255.224 broadcast
>> x.x.x.147 up
>
>ifconfig tunl0
x.x.x.155 netmask 255.255.255.255 broadcast x.x.x.155 up
>route add -host
x.x.x.155 dev tunl0
with this, it would be nice if we understood what
route did/does...
>
>> smurfette# /sbin/route add -host
x.x.x.147 dev tunl0
>> smurfette# echo 1 >
/proc/sys/net/ipv4/conf/all/hidden
>> smurfette# echo 1 >
/proc/sys/net/ipv4/conf/tunl0/hidden
>>
>> With this we have
not been able to get either machine to pass back a web
>>
page.
>>
>>
>> The way we think it works, is that the
director receives a packet on
>> x.x.x.155:80, and schedules the packet
for either itself or smurfette. At
>> that point we're not certain if
LVS will encapsulate the packet itself and
>> then deliver to
x.x.x.147, or if it will want to use an IP-tunneling
>> interface that
we've already set up. One of the reasons we suspect that LVS
>> doesn't
do the encapsulation step internally is because we haven't seen
>>
anywhere that tells LVS if it is running in TUN or NAT mode, so
we're
>> assuming that those distinctions are in the environment setup,
and do not
>> affect LVS's internal operations. We're also not certain
how such an
>> interface works, our background with ifconfig is limited
to configuring an
>> ethernet adapter for more than one IP :(. We're
not even sure how we'll
>> convince Smurfette to decapsulate the
incoming packets.
>>
>> One of the biggest reasons that we
can't just tinker and figure these
>> things out for ourselves is that
when the director isn't talking to the
>> realservers, we don't have a
way to diagnose where the problem is (or if
>> it's the tunnel, whats
the matter with it). I don't think we can set up
>> tcpdump to identify
encapsulated packets for instance.
>>
>> So I guess that
outlines where our situation is. If anybody help us down
>> the path to
enlightenment, it would greatly be appreciated
:)
>>
>
>Finally, browse http://x.x.x.155/ on the third machine. It should
work.
you mean from the local machine or from the
net? It doesn't seem to work either way.
Sorry to be such a pain, but we cannot find any
online documentation or information in OS manuals about these technologies such
as ip tunneling, exotic routing rules.
>
>Wensong
>
>> Jess and
Jim
>> bend.com
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