Yes it will work (technically it is feasible), with several caveats, namely,
multicast is typically not enabled on WANs
yeah, I would say feasible, but unless you can talk to every ISP in the chain
between point A and point B and convince them to pass your mutlicast along,
then you're pretty much screwed.
I would still say no, most ISPs block multicast, its to much of a drain on
their bandwidth.
however, if you werent concerned with security, its pretty straightforward to
implement a TCP membership protocol, instead of multicast, where you hard code
your members. I would say this is about 4-8hours of programming, and then you
would be set. I will add this to the feature list for the people who want to
have this feature earlier on.
Filip
Tim Lucia wrote:
So, wouldn't the answer really be
Yes it will work (technically it is feasible), with several caveats, namely,
multicast is typically not enabled on WANs, and the transmission protocol
for replication is not secure. It boils down to a network problem - and if
you had a secure VPN over WAN which would carry multicast, it work be
technically feasible and as secure as your VPN.
?
Tim
-----Original Message-----
From: Filip Hanik - Dev Lists [mailto:[EMAIL PROTECTED]
Sent: Friday, March 17, 2006 8:16 AM
To: Tomcat Users List
Subject: Re: Tomcat clustering
actually, the answer is no, even if you enable multicast over WAN, you are
dealing with some serious security issues, cause the the transmission of the
data is not encrypted and you are facing a serious liability.
For TC6 we have separated out the comm protocol from the replication logic,
and WAN replication is one of the features on the list, doing this over SSL
if you are not on a private network.
So we are little away from making this happen, but it is on the radar.
Filip
Peter Rossbach wrote:
Yes and no!
Speak with your network admin that the multicast send to other global
machine. Not working over normal internet ways!
I thing clustering is made for local network failover. What you need
are cluster domains. Gropus of clusters with a separate loadbalancer
to route request over you country boundaries. That works fine :-)
Peter
Am 17.03.2006 um 00:02 schrieb Larry Mulcahy:
My question is:
Is it reasonable to expect Tomcat clustering to work for servers not
in the same network? Widely separated in different states?
I have read the docs but don't understand the whole multicast thing.
I have set up two servers with clustering enabled on the same subnet
and they see each other, no problem. Then I tried to add another
server on a different subnet, no dice. I am experimenting with some
configuration settings like the multicast address but would like to
hear from someone who knows 'yes this can be done' before I invest
too much more time.
--Larry Mulcahy
Good system software should be free, like air
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