LVS + Keepalived #22013/08/20 |
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It's Redundant configuration for LVS + Keepalived Server itself.
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+----------------+----------------+
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192.168.0.100|eth0 ----VIP:192.168.0.99--- eth0|192.168.0.101
+----------------+ +----------------+
| LVS+Keepalived | | LVS+Keepalived |
+----------------+ +----------------+
10.0.0.100|eth1 -----VIP:10.0.0.99----- eth1|10.0.0.101
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+----------------+----------------+
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+----------+ | +----------+
| |10.0.0.30 | 10.0.0.31| |
| Backend1 |------------------------------| Backend2 |
| Web | eth0 eth0| Web |
+----------+ +----------+
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Please change the default gateway to internal VIP address of Keepalived Server on both Backend Web Servers first.
(it's 10.0.0.99 on this example)
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| [1] | Clear the LVS settings first because it is controled by Keepalived. |
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[root@gw ~]# ipvsadm -C [root@gw ~]# /etc/rc.d/init.d/ipvsadm save ipvsadm: Saving IPVS table to /etc/sysconfig/ipvsadm: [ OK ] |
| [2] | Configure Keepalived It's OK to set the same settings except one setting on both backend servers. (it's "priority" section. Change it on both backend server.) |
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[root@gw ~]# mv /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bk
[root@gw ~]#
vi /etc/keepalived/keepalived.conf # create new
global_defs {
notification_email {
cent@srv.world
}
notification_email_from root@srv.world
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_Server
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
# priority (change it on both servers)
priority 100
advert_int 1
# authentication information between Keepalived servers
authentication {
auth_type PASS
auth_pass password
}
virtual_ipaddress {
# virtual IP address
192.168.0.99 dev eth0
10.0.0.99 dev eth1
}
}
virtual_server 192.168.0.99 80 {
delay_loop 3
lvs_sched rr
lvs_method NAT
protocol TCP
real_server 10.0.0.30 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
}
}
real_server 10.0.0.31 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
}
}
}
/etc/rc.d/init.d/keepalived restart Stopping keepalived: [ OK ] Starting keepalived: [ OK ] |
| [3] |
It's OK all. Access to the Service IP address and make sure it works normally.
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