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Dear Hatt Tom,
see http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.LVS-DR.html
docu sample for keepalived as LB : www.keepalived.org/pdf/UserGuide.pdf
docu sample for ldirectord as LB :
http://www.tomvernon.co.uk/blog/2012/03/load-balanced-linux-web-cluster/
For real Productive Internet Services i wuold suggeest don´t use rfc1912
addresses at LVS-DR and realservers with LVS-DR.
see page : http://www.ultramonkey.org/papers/lvs_tutorial/html
Figure 2: LVS Direct Routing
In some words :
An Traffik-requestor ( end user with webbrowser i.e ) request to open i.e
www.test.org at his PC
That page have IP 217.145.96.131 as it sample ( VIP ) IP
The LB´s( 2 or more servers) manage the Virtual IP(VIP ) , IPVS kernel table
been managed by keepalived or ldirectord .
Thus , the traffik that reach the VIP been redirected from the LB´s IPVS to
realserver using arp discover
( some allowed to correct my wording here .. :-) )
Real servers must be configured to accept traffic for the virtual server's IP
address ( configured at lo:? , noarp usage at kernel)
Then the realserver directly answer to the traffik requestor.
see page : http://www.ultramonkey.org/papers/lvs_tutorial/html
Figure 2: LVS Direct Routing
There are more DR configuration variants with i.e fwmark .
Depends on your network setup ( i.e behind an filewall, NAT Router or others )
My own HOME Cluster setup are use rfc1912 , i am BEHIND an NAT Router have only
one Public IPv4 but an dynamic class /48 IPV6 as well.
Sutch apply with strange behavios ( i.e arp issues ) some times .
--
Mit freundlichen Grüßen / Best Regards
Horst Venzke ; PGP NET : 1024G/082F2E6D ; http://www.remsnet.de
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> Gesendet: Mittwoch, 01. Januar 2014 um 15:30 Uhr
> Von: "Hatt Tom" <net.study.sea@xxxxxxxxx>
> An: "LinuxVirtualServer.org users mailing list."
> <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
> Betreff: Re: [lvs-users] How does the director server connect with eah real
> server ?
>
> thanks for reply !
>
> Actually I meaned the DR mode , The document says that the Load
> balancer will transfer user's packets to realserver ,
> then realserver will reply directly to user after processing the packets .
>
> my question is how does the real server reply directly to users ?
> does real server have public ip ?
>
>
>
>
>
>
>
> 2014/1/1 Horst Venzke-Fa Remsnet Ltd <support@xxxxxxxxxx>:
> > Hello Hatt Tom,
> >
> > That depends on what LVS Mode you use.
> >
> > at LVS DR , the LVS Director ( aka "LB") the LB and realservers are
> > allmost the same network .
> > default Route of realservers to network´s default route
> >
> > at LVS NAT , the LVS Director ( aka "LB") realservers are not at the same
> > network ,
> > LB are in Front of the Realservers.
> > default Route of realservers to LB ´s NAT network.
> >
> > see http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/
> >
> >
> > --
> > Mit freundlichen Grüßen / Best Regards
> >
> > Horst Venzke ; PGP NET : 1024G/082F2E6D ; http://www.remsnet.de
> >
> > Legal Notice: This transmittal and/or attachments may be privileged or
> > confidential. It is intended solely for the addressee named above. Any
> > review, dissemination, or copying is strictly prohibited. If you received
> > this transmittal in error, please notify us immediately by reply and
> > immediately delete this message and all its attachments. Thank you.
> >
> >
> >> Gesendet: Mittwoch, 01. Januar 2014 um 14:45 Uhr
> >> Von: "Hatt Tom" <net.study.sea@xxxxxxxxx>
> >> An: "LinuxVirtualServer.org users mailing list."
> >> <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
> >> Betreff: [lvs-users] How does the director server connect with eah real
> >> server ?
> >>
> >> Does director server and real server working in on LAN ?
> >> If so , could I consider the director server as on route of the LAN ?
> >> Does it has many network interfaces to connect with several real
> >> servers ?
> >>
> >>
> >>
> >> --
> >> Best Regards!
> >>
> >> _______________________________________________
> >> Please read the documentation before posting - it's available at:
> >> http://www.linuxvirtualserver.org/
> >>
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> >> or go to http://lists.graemef.net/mailman/listinfo/lvs-users
> >>
> > _______________________________________________
> > Please read the documentation before posting - it's available at:
> > http://www.linuxvirtualserver.org/
> >
> > LinuxVirtualServer.org mailing list - lvs-users@xxxxxxxxxxxxxxxxxxxxxx
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>
>
>
> --
> Best Regards!
>
> _______________________________________________
> Please read the documentation before posting - it's available at:
> http://www.linuxvirtualserver.org/
>
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