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22.07.10, 17:25, "Simon Horman" <horms@xxxxxxxxxxxx>:
> On Thu, Jul 22, 2010 at 07:51:20AM +0400, Franchoze Eric wrote:
> > Hello,
> >
> > I'm trying to do load balancing of incoming traffic to my applications.
> This applications are not very smp friendly, and I want try to run some
> instances according to number of cpus on single machine. And balance load of
> incoming traffic/connections to this applications.
> > Looks like is should be similar to
> http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.localnode.html
> >
> > linux kernel 2.6.32 with or without hide interface patches. Tried
> different configurations but could not see packets on application layer.
> >
> > 192.168.1.165 - eth0 - interface for external connections
> > 195.0.0.1 - dummy0 - virtual interface, real application is binded to that
> address.
> >
> > Configuration is:
> > -A -t 192.168.1.165:1234 -s wlc
> > -a -t 192.168.1.165:1234 -r 195.0.0.1:1234 -g -w
> >
> > #ipvsadm -L -n
> > IP Virtual Server version 1.2.1 (size=4096)
> > Prot LocalAddress:Port Scheduler Flags
> > -> RemoteAddress:Port Forward Weight ActiveConn InActConn
> > TCP 192.168.1.165:1234 wlc
> > -> 195.0.0.1:1234 Local 1 0 0
> > #
> >
> > Log:
> > [ 2106.897409] IPVS: lookup/out TCP
> 192.168.1.165:44847->192.168.1.165:1234 not hit
> > [ 2106.897412] IPVS: lookup service: fwm 0 TCP 192.168.1.165:1234 hit
> > [ 2106.897414] IPVS: ip_vs_wlc_schedule(): Scheduling...
> > [ 2106.897416] IPVS: WLC: server 195.0.0.1:1234 activeconns 0 refcnt 2
> weight 1 overhead 1
> > [ 2106.897418] IPVS: Enter: ip_vs_conn_new,
> net/netfilter/ipvs/ip_vs_conn.c line 693
> > [ 2106.897421] IPVS: Bind-dest TCP c:192.168.1.165:44847
> v:192.168.1.165:1234 d:195.0.0.1:1234 fwd:L s:0 conn->flags:181
> conn->refcnt:1 dest->refcnt:3
> > [ 2106.897425] IPVS: Schedule fwd:L c:192.168.1.165:44847
> v:192.168.1.165:1234 d:195.0.0.1:1234 conn->flags:1C1 conn->refcnt:2
> > [ 2106.897429] IPVS: TCP input [S...] 195.0.0.1:1234->192.168.1.165:44847
> state: NONE->SYN_RECV conn->refcnt:2
> > [ 2106.897431] IPVS: Enter: ip_vs_null_xmit,
> net/netfilter/ipvs/ip_vs_xmit.c line 212
> > [ 2106.897439] IPVS: lookup/in TCP 192.168.1.165:1234->192.168.1.165:44847
> not hit
> > [ 2106.897441] IPVS: lookup/out TCP
> 192.168.1.165:1234->192.168.1.165:44847 not hit
> > [ 2107.277535] IPVS: packet type=1 proto=17 daddr=255.255.255.255 ignored
> > [ 2108.542691] IPVS: packet type=1 proto=17 daddr=192.168.1.255 ignored
> >
> > As the result, server application does receive anything on accept(). I
> tried to make dummy0 a hidden device and play with arp settings. But without
> result.
> >
> > I will be happy to hear any idea how to do connection in this environment.
>
> Hi,
>
> while others have suggested not using LVS for this task for various reasons.
> I would just like to comment that this should work and this smells
> like a bug to me. I will try and confirm that. But it won't be today.
>
>
>
With the latest kernel I see that: LVS accepts connections, selects right
destination (if round robin is selected destination changes accoring it), then
it detects that it is local node and do:
net/netfilter/ipvs/ip_vs_xmit.c:
ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
struct ip_vs_protocol *pp)
Which does nothing with skb. (here I do not understand what happens with that
packet then)
I think if VLS could change destination for packets which go from local node to
local node then connection can be established. Is it reasonable?
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