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Setup Load Balancer's using Keepalived
load01 and load02
===========================================
Load01 config:
[root@vml-load01 ~]# ip addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
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: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state
UP qlen 1000
link/ether 08:00:27:6b:b8:c1 brd ff:ff:ff:ff:ff:ff
inet 10.0.200.50/24 brd 10.0.200.255 scope global eth1
inet 10.0.200.60/32 brd 10.0.200.60 scope global eth1:0
inet6 fe80::a00:27ff:fe6b:b8c1/64 scope link
valid_lft forever preferred_lft forever
===========================================
manually forced the ipvsadm config:
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 10.0.200.60:smtp wlc
-> 10.0.200.52:smtp Route 1 0 0
TCP 10.0.200.60:http rr persistent 50
-> 10.0.200.52:http Route 1 0 0
=========================================================
Traffic Traverses:
load01 -> proxy01 -> interface eth2:0
=============================================================
Network config on proxy01:
eth2 Link encap:Ethernet HWaddr 08:00:27:01:B4:79
inet addr:10.0.200.52 Bcast:10.0.200.255 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fe01:b479/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:221795 errors:0 dropped:0 overruns:0 frame:0
TX packets:213292 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:19749301 (18.8 MiB) TX bytes:20172223 (19.2 MiB)
eth2:0 Link encap:Ethernet HWaddr 08:00:27:01:B4:79
inet addr:10.0.200.60 Bcast:10.0.200.60 Mask:255.255.255.255
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
===============================================================
Dump while trying to connect to port 25:
[root@vml-proxy-1 ~]# tcpdump -i eth2:0 port 25
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth2:0, link-type EN10MB (Ethernet), capture size 65535 bytes
15:52:26.179428 IP 10.0.200.53.41345 > 10.0.200.60.smtp: Flags [S], seq
868460265, win 14600, options [mss 1460,sackOK,TS val 270492287 ecr
0,nop,wscale 5], length 0
===============================================================
Setup arptables to prevent arp for VIP from going out:
# Generated by arptables-save v0.0.8 on Mon May 19 15:54:49 2014
*filter
:IN ACCEPT [29741:832748]
:OUT ACCEPT [27508:770224]
:FORWARD ACCEPT [0:0]
-A IN -d 10.0.200.60 -j DROP
-A OUT -s 10.0.200.60 -j mangle --mangle-ip-s 10.0.200.52
COMMIT
# Completed on Mon May 19 15:54:49 2014
===============================================================
Logs for keepalived:
May 19 16:14:23 vml-load01 Keepalived_healthcheckers[8254]: Opening file
'/etc/keepalived/keepalived.conf'.
May 19 16:14:23 vml-load01 Keepalived_healthcheckers[8254]: Configuration
is using : 16262 Bytes
May 19 16:14:23 vml-load01 Keepalived_vrrp[8256]: Using LinkWatch kernel
netlink reflector...
May 19 16:14:23 vml-load01 Keepalived_vrrp[8256]: VRRP sockpool:
[ifindex(2), proto(112), fd(10,11)]
May 19 16:14:23 vml-load01 Keepalived_healthcheckers[8254]: Using
LinkWatch kernel netlink reflector...
May 19 16:14:23 vml-load01 Keepalived_healthcheckers[8254]: Activating
healthchecker for service [10.0.200.52]:80
May 19 16:14:23 vml-load01 Keepalived_healthcheckers[8254]: Activating
healthchecker for service [10.0.200.53]:80
May 19 16:14:24 vml-load01 Keepalived_vrrp[8256]: VRRP_Instance(VI_1)
Transition to MASTER STATE
May 19 16:14:24 vml-load01 Keepalived_healthcheckers[8254]: Error
connecting server [10.0.200.52]:80.
May 19 16:14:24 vml-load01 Keepalived_healthcheckers[8254]: Removing
service [10.0.200.52]:80 from VS [10.0.200.60]:80
May 19 16:14:24 vml-load01 Keepalived_healthcheckers[8254]: Remote SMTP
server [0.0.0.0]:25 connected.
May 19 16:14:24 vml-load01 Keepalived_healthcheckers[8254]: Error
connecting server [10.0.200.53]:80.
May 19 16:14:24 vml-load01 Keepalived_healthcheckers[8254]: Removing
service [10.0.200.53]:80 from VS [10.0.200.60]:80
May 19 16:14:24 vml-load01 Keepalived_healthcheckers[8254]: Lost quorum
1-0=1 > 0 for VS [10.0.200.60]:80
May 19 16:14:24 vml-load01 Keepalived_healthcheckers[8254]: Remote SMTP
server [0.0.0.0]:25 connected.
May 19 16:14:25 vml-load01 Keepalived_healthcheckers[8254]: Error
processing HELO cmd on SMTP server [0.0.0.0]:25. SMTP status code = 501
May 19 16:14:25 vml-load01 Keepalived_healthcheckers[8254]: Can not read
data from remote SMTP server [0.0.0.0]:25.
May 19 16:14:25 vml-load01 Keepalived_healthcheckers[8254]: Error
processing HELO cmd on SMTP server [0.0.0.0]:25. SMTP status code = 501
May 19 16:14:25 vml-load01 Keepalived_healthcheckers[8254]: Can not read
data from remote SMTP server [0.0.0.0]:25.
May 19 16:14:25 vml-load01 Keepalived_vrrp[8256]: VRRP_Instance(VI_1)
Entering MASTER STATE
May 19 16:14:25 vml-load01 Keepalived_vrrp[8256]: VRRP_Instance(VI_1)
setting protocol VIPs.
May 19 16:14:25 vml-load01 Keepalived_healthcheckers[8254]: Netlink
reflector reports IP 10.0.200.60 added
May 19 16:14:25 vml-load01 Keepalived_vrrp[8256]: VRRP_Instance(VI_1)
Sending gratuitous ARPs on eth1 for 10.0.200.60
May 19 16:14:30 vml-load01 Keepalived_vrrp[8256]: VRRP_Instance(VI_1)
Sending gratuitous ARPs on eth1 for 10.0.200.60
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