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Hi,
We are using this tool in one of our project, and we are facing a disconnect
every ~2MB of data transferred.
rhel 7n
ipvsadm.x86_64
1.27-7.el7
keepalived.x86_64
1.3.5-1.el7
kernel.x86_64
3.1nnN0.0-514.21.1.el7
Our configuration:
VIP 10.1.1.130
LB1 10.1.1.131 Virtual Server keepalived Active
LB2 10.1.1.132 Virtual Server keepalived backup
MQ1 10.1.1.151 Real Server MQ Active
MQ2 10.1.1.152 Real Server MQ Standby
Our keepalived.conf (simplified)
global_defs {
notification_email {
blablalba@xxxxxxxxxx<mailto:blablalba@xxxxxxxxxx>
}
notification_email_from blablalba@xxxxxxxxxx<mailto:blablalba@xxxxxxxxxx>
smtp_server sysmail.mymail.com
smtp_connect_timeout 30
}
vrrp_instance vi_y-maas {
state BACKUP
virtual_router_id 100
interface ens32
priority 150
advert_int 5
nopreempt
smtp_alert
virtual_ipaddress {
10.1.1.130/25
}
}
# My MQ
virtual_server 10.1.1.130 1423 {
delay_loop 2
protocol TCP
lb_algo rr
lb_kind DR
real_server 10.1.1.151 1423 {
weight 10
TCP_CHECK {
}
}
real_server 10.1.1.152 1423 {
weight 10
TCP_CHECK {
}
}
}
On MQ1 and MQ2, we have added ARP rules (due to Direct Routing)
:INPUT ACCEPT
:OUTPUT ACCEPT
:FORWARD ACCEPT
-A INPUT -j DROP -d 10.1.1.130
-A OUTPUT -j mangle -s 10.1.1.130 --mangle-ip-s 10.1.1.151
And
:INPUT ACCEPT
:OUTPUT ACCEPT
:FORWARD ACCEPT
-A INPUT -j DROP -d 10.1.1.130
-A OUTPUT -j mangle -s 10.1.1.130 --mangle-ip-s 10.1.1.152
MQ1 and MQ2 also have the VIP Address as a secondary address of the interface
2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP
qlen 1000
link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
inet 10.1.1.151/25 brd 10.1.1.255 scope global ens32
valid_lft forever preferred_lft forever
inet 10.1.1.130/25 scope global secondary ens32
valid_lft forever preferred_lft forever
This permit us to direct the routing to the active MQ without intervention (if
the Active MQ fail, the StdBy take relay and the LB detect that MQ1 is down and
MQ2 is up)
My problem
When trying to read messages (~8'000) from MQ, using VIP to connect, the
program can read ~2MB, then the connection is broken (We can see that in
Wireshark trace that there are 5 TCP Retransmit with increasing delay between
retransmit, between the IP where the Application PGM runs and the VIP address,
and that at the same time, there is no more traffic between the LB1 (active LB)
to the MQ1 (Active MQ)
With the same pgm, same read of messages, when connecting directly to the MQ1,
there is no problems.
Could this be a problem related to keepalived or from linux-lvs it-self ?
Many thanks and regards
Robert
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