i'm trying to setup LVS, and tried both the lvs-dr and the lvs-nat, but can't get any to work. I'm hoping people here can answer a few questions that might help and shed light onto the situation?
#1 with regards to the Real Servers, is there anything that needs to be configured other that the http service? I ask this, because I suspect yes, and it has to do with what type of LVS you have:
1a) lvs-dr: on the RIP of the web servers, create an lo:0 and assign the VIP to it 1b ) lvs-nat: on the RIP of the web servers, make sure the default gw points to the inside network card eth1 1b) lvs-nat: on the LVS, with 2 nics, eth1 (private where web servers are located): 192.168.0.100, and create a nat gateway of 192.168.0.254, where the real web servers gw is, and make it eth1:1
how do I go about getting diagnostic info from all this? pulse? i can't connect at all to any of the web servers..
If any has the time, i will glady send my configs..
Thanks!
william
There are several things that I would suggest looking at.
Red Hat has some really good documentation on setting up LVS using piranha (rpm's are available for CentOS) you can get that here: https://www.redhat.com/docs/manuals/csgfs/
There is a document outlining the steps that need to be taken when doing direct routing LVS in /usr/share/piranha-<version>/docs/ HOWTO.direct-routing.
I have had several issues with getting two load balancers setup for LDAP lookups, I have yet to get them resolved.
Josh G.
On Jan 3, 2008, at 9:02 AM, William Ottley wrote:
i'm trying to setup LVS, and tried both the lvs-dr and the lvs-nat, but can't get any to work. I'm hoping people here can answer a few questions that might help and shed light onto the situation?
#1 with regards to the Real Servers, is there anything that needs to be configured other that the http service? I ask this, because I suspect yes, and it has to do with what type of LVS you have:
1a) lvs-dr: on the RIP of the web servers, create an lo:0 and assign the VIP to it 1b ) lvs-nat: on the RIP of the web servers, make sure the default gw points to the inside network card eth1 1b) lvs-nat: on the LVS, with 2 nics, eth1 (private where web servers are located): 192.168.0.100, and create a nat gateway of 192.168.0.254, where the real web servers gw is, and make it eth1:1
how do I go about getting diagnostic info from all this? pulse? i can't connect at all to any of the web servers..
If any has the time, i will glady send my configs..
Thanks!
william
--
Morpheus: After this, there is no turning back. You take the blue pill
- the story ends, you wake up in your bed and believe whatever you
want to believe. You take the red pill - you stay in Wonderland and I show you how deep the rabbit-hole goes. _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
William Ottley wrote:
i'm trying to setup LVS, and tried both the lvs-dr and the lvs-nat, but can't get any to work.
LVS-DR did work for me partially, as-in it did not load balance. But i am sure it was a mistake on my part. Still have to find time and test it.
#1 with regards to the Real Servers, is there anything that needs to be configured other that the http service? I ask this, because I suspect yes, and it has to do with what type of LVS you have:
The http service + firewall rules (if applicable)
1a) lvs-dr: on the RIP of the web servers, create an lo:0 and assign the VIP to it
Yes.
1b ) lvs-nat: on the RIP of the web servers, make sure the default gw points to the inside network card eth1
I have found that the default gw is not really a strict requirement. Worked for me with a different gw too, but i cannot stamp a confirmation on that. Got to recheck... just in case.
1b) lvs-nat: on the LVS, with 2 nics, eth1 (private where web servers are located): 192.168.0.100, and create a nat gateway of 192.168.0.254, where the real web servers gw is, and make it eth1:1
Looks Good.
how do I go about getting diagnostic info from all this? pulse? i can't connect at all to any of the web servers..
1. Are real servers accessible from lvs (ping/arp -n?) 2. Does telnet to port 80 (or the one to which http server is listening to) on real server from lvs work?
if #1 == yes and #2 == no, it might be the firewall on the real servers.
-- Regards Anup Shukla
thanks Anup for your help, i finally did get lvs-nat working: the "/proc/../ip_forwarding was not set properly.
My next step is to do LVS-TUN, and i'm stumped on which way to start. I will have 3 internet network connection on the load balancer
#1 official load balancer (where the webserver dns is pointed to) eth0 #2 eth1, which will have a tun? to connect to a geographical web server #2 eth2, which is the same as eth1, but a different web server.
so naturally, I need to do an LVS-NAT, BUT. can I have tunneling with that as well? And as far as I know, I don't have to worry about the arp...
William
On Jan 3, 2008 6:48 PM, Anup Shukla anup.shkl@gmail.com wrote:
William Ottley wrote:
i'm trying to setup LVS, and tried both the lvs-dr and the lvs-nat, but can't get any to work.
LVS-DR did work for me partially, as-in it did not load balance. But i am sure it was a mistake on my part. Still have to find time and test it.
#1 with regards to the Real Servers, is there anything that needs to be configured other that the http service? I ask this, because I suspect yes, and it has to do with what type of LVS you have:
The http service + firewall rules (if applicable)
1a) lvs-dr: on the RIP of the web servers, create an lo:0 and assign the VIP to it
Yes.
1b ) lvs-nat: on the RIP of the web servers, make sure the default gw points to the inside network card eth1
I have found that the default gw is not really a strict requirement. Worked for me with a different gw too, but i cannot stamp a confirmation on that. Got to recheck... just in case.
1b) lvs-nat: on the LVS, with 2 nics, eth1 (private where web servers are located): 192.168.0.100, and create a nat gateway of 192.168.0.254, where the real web servers gw is, and make it eth1:1
Looks Good.
how do I go about getting diagnostic info from all this? pulse? i can't connect at all to any of the web servers..
- Are real servers accessible from lvs (ping/arp -n?)
- Does telnet to port 80 (or the one to which http server is listening
to) on real server from lvs work?
if #1 == yes and #2 == no, it might be the firewall on the real servers.
-- Regards Anup Shukla
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
William Ottley wrote:
i'm trying to setup LVS, and tried both the lvs-dr and the lvs-nat, but can't get any to work. I'm hoping people here can answer a few questions that might help and shed light onto the situation?
#1 with regards to the Real Servers, is there anything that needs to be configured other that the http service? I ask this, because I suspect yes, and it has to do with what type of LVS you have:
1a) lvs-dr: on the RIP of the web servers, create an lo:0 and assign the VIP to it
You also have to tell the real servers to ignore arp requests for the VIP.
-
Anup Shukla -
Christopher Chan -
Joshua Gimer -
William Ottley