[lvs-users] where is connection?

Gerry Reno greno at verizon.net
Thu Aug 2 16:46:43 BST 2007


Gerry Reno wrote:
> I went and established a ssh connection to my VIP and I also started a 
> web session to my VIP but when I look for connections on MASTER I do not 
> see them.  Instead I see connections on BACKUP.  Here is some output:
>
> MASTER:
> [root at grp-01-00-50 keepalived]# ipvsadm -l
> IP Virtual Server version 1.2.1 (size=4096)
> Prot LocalAddress:Port Scheduler Flags
>   -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
> TCP  192.168.1.240:https rr persistent 600
>   -> 192.168.1.201:https          Route   1      0          0        
>   -> 192.168.1.200:https          Route   1      0          0        
> TCP  10.3.0.3:http wlc persistent 600
> TCP  192.168.1.240:http rr persistent 600
>   -> 192.168.1.201:http           Route   1      0          0        
>   -> 192.168.1.200:http           Route   1      0          0        
> TCP  192.168.1.240:ssh rr persistent 600
>   -> 192.168.1.201:ssh            Route   1      0          0        
>   -> 192.168.1.200:ssh            Route   1      0          0        
> [root at grp-01-00-50 keepalived]# ip addr show
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
>     inet 127.0.0.1/8 scope host lo
>     inet6 ::1/128 scope host
>        valid_lft forever preferred_lft forever
> 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast 
> qlen 1000
>     link/ether 00:0c:29:a7:c7:33 brd ff:ff:ff:ff:ff:ff
>     inet 192.168.1.150/24 brd 192.168.1.255 scope global eth0
>     inet 192.168.1.240/24 scope global secondary eth0                 
> <----------- VIP is here on MASTER
>     inet6 fe80::20c:29ff:fea7:c733/64 scope link
>        valid_lft forever preferred_lft forever
>
>
> BACKUP:
> [root at grp-01-00-51 keepalived]# ipvsadm -l
> IP Virtual Server version 1.2.1 (size=4096)
> Prot LocalAddress:Port Scheduler Flags
>   -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
> TCP  192.168.1.240:https rr persistent 600
>   -> 192.168.1.201:https          Route   1      0          0        
>   -> 192.168.1.200:https          Route   1      0          0        
> TCP  192.168.1.240:http rr persistent 600
>   -> 192.168.1.201:http           Route   1      3          0           
> <------ VIP connections are here in BACKUP list
>   -> 192.168.1.200:http           Route   1      0          0        
> TCP  192.168.1.240:ssh rr persistent 600
>   -> 192.168.1.201:ssh            Route   1      1          0           
> <------ VIP connections are here in BACKUP list
>   -> 192.168.1.200:ssh            Route   1      0          0        
> [root at grp-01-00-51 keepalived]#
> [root at grp-01-00-51 keepalived]# ip addr show
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
>     inet 127.0.0.1/8 scope host lo
>     inet 192.168.1.240/32 scope host lo
>     inet6 ::1/128 scope host
>        valid_lft forever preferred_lft forever
> 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast 
> qlen 1000
>     link/ether 00:0c:29:54:ef:09 brd ff:ff:ff:ff:ff:ff
>     inet 192.168.1.151/24 brd 192.168.1.255 scope global eth0
>     inet6 fe80::20c:29ff:fe54:ef09/64 scope link
>        valid_lft forever preferred_lft forever
>
>
>
> This is confusing.
>
> Gerry
>
>   
So I wait for a while and let all connections go inactive/timeout then I 
reload webpage to VIP and make new connection using ssh to VIP and now 
it is showing on MASTER. Not one new entry in logs on either server. So 
how can this be?
MASTER:
[root at grp-01-00-50 keepalived]# ipvsadm -l
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.1.240:https rr persistent 600
-> 192.168.1.201:https Route 1 0 0
-> 192.168.1.200:https Route 1 0 0
TCP 10.3.0.3:http wlc persistent 600
TCP 192.168.1.240:http rr persistent 600
-> 192.168.1.201:http Route 1 1 0
-> 192.168.1.200:http Route 1 0 0
TCP 192.168.1.240:ssh rr persistent 600
-> 192.168.1.201:ssh Route 1 1 0
-> 192.168.1.200:ssh Route 1 0 0


BACKUP:
[root at grp-01-00-51 keepalived]# ipvsadm -l
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.1.240:https rr persistent 600
-> 192.168.1.201:https Route 1 0 0
-> 192.168.1.200:https Route 1 0 0
TCP 192.168.1.240:http rr persistent 600
-> 192.168.1.201:http Route 1 0 0
-> 192.168.1.200:http Route 1 0 0
TCP 192.168.1.240:ssh rr persistent 600
-> 192.168.1.201:ssh Route 1 0 0
-> 192.168.1.200:ssh Route 1 0 0

Can anyone explain why this is happening. The LVS is working just fine 
but the connections aren't always where they should be.

Gerry






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