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4.2. Keepalived Direct Routing Configuration
Direct Routing configuration of Keepalived is similar in configuration with NAT. In the following example, Keepalived is configured to provide load balancing for a group of real servers running HTTP on port 80. To configure Direct Routing, change the
lb_kind parameter to DR. Other configuration options are discussed in Section 4.1, “A Basic Keepalived configuration”.
The following example shows the
keepalived.conf file for the active server in a Keepalived configuration that uses direct routing.
global_defs {
notification_email {
admin@example.com
}
notification_email_from noreply_admin@example.com
smtp_server 127.0.0.1
smtp_connect_timeout 60
}
vrrp_instance RH_1 {
state MASTER
interface eth0
virtual_router_id 50
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass passw123
}
virtual_ipaddress {
172.31.0.1
}
}
virtual_server 172.31.0.1 80 {
delay_loop 10
lb_algo rr
lb_kind DR
persistence_timeout 9600
protocol TCP
real_server 192.168.0.1 80 {
weight 1
TCP_CHECK {
connect_timeout 10
connect_port 80
}
}
real_server 192.168.0.2 80 {
weight 1
TCP_CHECK {
connect_timeout 10
connect_port 80
}
}
real_server 192.168.0.3 80 {
weight 1
TCP_CHECK {
connect_timeout 10
connect_port 80
}
}
}
The following example shows the
keepalived.conf file for the backup server in a Keepalived configuration that uses direct routing. Note that the state and priority values differ from the keepalived.conf file in the active server.
global_defs {
notification_email {
admin@example.com
}
notification_email_from noreply_admin@example.com
smtp_server 127.0.0.1
smtp_connect_timeout 60
}
vrrp_instance RH_1 {
state BACKUP
interface eth0
virtual_router_id 50
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass passw123
}
virtual_ipaddress {
172.31.0.1
}
}
virtual_server 172.31.0.1 80 {
delay_loop 10
lb_algo rr
lb_kind DR
persistence_timeout 9600
protocol TCP
real_server 192.168.0.1 80 {
weight 1
TCP_CHECK {
connect_timeout 10
connect_port 80
}
}
real_server 192.168.0.2 80 {
weight 1
TCP_CHECK {
connect_timeout 10
connect_port 80
}
}
real_server 192.168.0.3 80 {
weight 1
TCP_CHECK {
connect_timeout 10
connect_port 80
}
}
}