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First of all, sorry about all the e-mails. You know how it is when
you're hot on the trail of a problem and sometimes you get a little too
excited.
I have narrowed down the problem and I can reproduce it. When I run
ipvsadm to change the weight of a realserver, it complains "Destination
already exists" and does not change the weight. ldirectord initially
sets the realserver weight to 0 and it is never getting set to 1, so
redirection never takes place.
See below...
[root@lb1 ~]# ipvsadm -A -t 192.168.5.100:21 -s rr
[root@lb1 ~]# ipvsadm -a -t 192.168.5.100:21 -r 192.168.10.61 -m -w 0
[root@lb1 ~]# ipvsadm -a -t 192.168.5.100:21 -r 192.168.10.61 -m -w 1
Destination already exists
[root@lb1 ~]# ipvsadm -l
IP Virtual Server version 1.2.0 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.5.100:ftp rr
-> 192.168.10.61:ftp Masq 0 0 0
After the commands above, I cannot connect to the virtual FTP server.
Note that the weight is still 0!
But if I delete the realserver and re-add it, as follows, the weight
goes to 1...
[root@lb1 ~]# ipvsadm -d -t 192.168.5.100:21 -r 192.168.10.61
[root@lb1 ~]# ipvsadm -a -t 192.168.5.100:21 -r 192.168.10.61 -m -w 1
[root@lb1 ~]# ipvsadm -l
IP Virtual Server version 1.2.0 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.5.100:ftp rr
-> 192.168.10.61:ftp Masq 1 0 0
And guess what?
C:\Documents and Settings\eric>ftp 10.0.0.34
Connected to 10.0.0.34.
220 (vsFTPd 2.0.1)
User (10.0.0.34:(none)): doctor
331 Please specify the password.
Password:
230 Login successful.
ftp>
The root cause is that ipvsadm is misbehaving. Instead of changing the
realserver's weight, it is complaining that the destination exists.
So, I must either convince ipvsadm not to complain when I change the
realserver weight, or I must convince ldirectord to delete and re-add
the realserver instead of trying to change its weight.
Comments will be well appreciated.
--
Eric Robinson
Disclaimer - July 16, 2006
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