LVS+keepalived 的DR模式的两种做法
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LVS DR模式搭建
准备工作
三台机器：
dr：192.168.13.15 rs1：192.168.13.16 rs2: 192.168.13.17 vip:192.168.13.100
修改DR上的/etc/sysctl.conf文件
net.ipv4.ip_forward=0改为net.ipv4.ip_forward=1
第一种做法lo
Dr上的配置
! Configuration File for Keepalived
! ---------------------------------------------------------------------------
! GLOBAL
! ---------------------------------------------------------------------------
global_defs {
! this is who emails will go to on alerts
notification_email {
[email protected]
! add a few more email addresses here if you would like
}
notification_email_from [email protected]
! mail relay server
smtp_server 127.0.0.1
smtp_connect_timeout 30
! each load balancer should have a different ID
! this will be used in SMTP alerts, so you should make
! each router easily identifiable
router_id LVS_13.100
}
vrrp_instance VI1_LVS_CN {
state MASTER
interface eth1
! interface to run LVS sync daemon on
lvs_sync_daemon_interface eth1
!mcast_src_ip 192.168.13.15
virtual_router_id 100
priority 100
advert_int 1
smtp_alert
authentication {
auth_type PASS
auth_pass qw_web
}
! these are the IP addresses that keepalived will setup on this
! machine. Later in the config we will specify which real
! servers are behind these IPs without this block, keepalived
! will not setup and takedown any IP addresses
virtual_ipaddress {
192.168.13.100
}
}
virtual_server 192.168.13.100 80 {
! interval between checks in seconds
delay_loop 5
! use weighted least connection as a load balancing algorithm
lb_algo wrr
! lvs_sched wrr
! we are doing Direct Routing
lb_kind DR
! lvs_method DR
protocol TCP
! WEB01
real_server 192.168.13.16 80 {
weight 100
HTTP_GET {
url {
path /.keepalived
status_code 200
}
connect_timeout 10
nb_get_retry 3
delay_before_retry 5
}
}
! WEB02
real_server 192.168.13.17 80 {
weight 100
HTTP_GET {
url {
path /.keepalived
status_code 200
}
connect_timeout 10
nb_get_retry 3
delay_before_retry 5
}
}
}
两台Rs上的这配置
[[email protected] shell]# more realserver.sh #!/bin/bash vip=192.168.13.100 case "$1" in start) ifdown lo ifup lo ifconfig lo:0 $vip broadcast $vip netmask 255.255.255.255 up /sbin/route add -host $vip lo:0 echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce ;; stop) ifdown lo ifup lo /sbin/route del -host $vip lo:0 echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce ;; *) echo "Usage: $0 {start|stop}" exit 1 esac exit 0
第二种做法iptables
Dr上的配置（同第一种一致）
! Configuration File for Keepalived
! ---------------------------------------------------------------------------
! GLOBAL
! ---------------------------------------------------------------------------
global_defs {
! this is who emails will go to on alerts
notification_email {
[email protected]
! add a few more email addresses here if you would like
}
notification_email_from [email protected]
! mail relay server
smtp_server 127.0.0.1
smtp_connect_timeout 30
! each load balancer should have a different ID
! this will be used in SMTP alerts, so you should make
! each router easily identifiable
router_id LVS_13.100
}
vrrp_instance VI1_LVS_CN {
state MASTER
interface eth1
! interface to run LVS sync daemon on
lvs_sync_daemon_interface eth1
!mcast_src_ip 192.168.13.15
virtual_router_id 100
priority 100
advert_int 1
smtp_alert
authentication {
auth_type PASS
auth_pass qw_web
}
! these are the IP addresses that keepalived will setup on this
! machine. Later in the config we will specify which real
! servers are behind these IPs without this block, keepalived
! will not setup and takedown any IP addresses
virtual_ipaddress {
192.168.13.100
}
}
virtual_server 192.168.13.100 80 {
! interval between checks in seconds
delay_loop 5
! use weighted least connection as a load balancing algorithm
lb_algo wrr
! lvs_sched wrr
! we are doing Direct Routing
lb_kind DR
! lvs_method DR
protocol TCP
! WEB01
real_server 192.168.13.16 80 {
weight 100
HTTP_GET {
url {
path /.keepalived
status_code 200
}
connect_timeout 10
nb_get_retry 3
delay_before_retry 5
}
}
! WEB02
real_server 192.168.13.17 80 {
weight 100
HTTP_GET {
url {
path /.keepalived
status_code 200
}
connect_timeout 10
nb_get_retry 3
delay_before_retry 5
}
}
}
两台Rs上的这配置
[[email protected] shell]# iptables -t nat -A PREROUTING -p tcp -d 192.168.13.100 --dport 80 -j REDIRECT [[email protected] shell]# iptables -t nat -A OUTPUT -p tcp -d 192.168.13.100 --dport 80 -j REDIRECT
以上两种方式均可实现DR模式。
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