DNS+keepalived+lvs实现高可用负载均衡集群
1、目的：部署两台lvs调度器并利用keepalived实现主主模型，DNS添加两条A记录指向lvs调度器实现轮询，最终实现高可用负载均衡集群效果
2、拓扑规划：
http://s1.运维网.com/wyfs02/M00/89/99/wKiom1gX6lCSeg7ZAAEYHDZjjEU391.png
3、配置实践
(1)同步所有机器时间
在每台机器实行ntp同步：
# ntpdate 10.1.0.1
26 Oct 20:10:57 ntpdate: step time server 10.1.0.1 offset -32408.643564 sec (2)先配置RS,在RS1和RS2中中设置相同的VIP，这里使用脚本来快速定义
RS的预配置脚本：
#!/bin/bash
#
vip=10.1.24.111
mask='255.255.255.255'
case $1 in
start)
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
ifconfig lo:0 $vip netmask $mask broadcast $vip up
route add -host $vip dev lo:0
;;
stop)
ifconfig lo:0 down
echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 0 > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce
echo 0 > /proc/sys/net/ipv4/conf/lo/arp_announce
;;
*)
echo "Usage $(basename $0) start|stop"
exit 1
;;
esac
(3)查看IP已经正确配置：
RS1:
eth0:11 Link encap:EthernetHWaddr 00:0C:29:7E:C0:90
inet addr:10.1.24.113Bcast:10.1.255.255Mask:255.255.0.0
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
lo Link encap:Local Loopback
inet addr:127.0.0.1Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNINGMTU:65536Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b)TX bytes:0 (0.0 b)
lo:0 Link encap:Local Loopback
inet addr:10.1.24.111Mask:255.255.255.255
UP LOOPBACK RUNNINGMTU:65536Metric:1
lo:1 Link encap:Local Loopback
inet addr:10.1.24.110Mask:255.255.255.255
UP LOOPBACK RUNNINGMTU:65536Metric:1
RS2：
eth1:11 Link encap:EthernetHWaddr 00:0C:29:00:E0:C5
inet addr:10.1.24.114Bcast:10.1.255.255Mask:255.255.0.0
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
lo Link encap:Local Loopback
inet addr:127.0.0.1Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNINGMTU:65536Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b)TX bytes:0 (0.0 b)
lo:0 Link encap:Local Loopback
inet addr:10.1.24.111Mask:255.255.255.255
UP LOOPBACK RUNNINGMTU:65536Metric:1
lo:1 Link encap:Local Loopback
inet addr:10.1.24.110Mask:255.255.255.255
UP LOOPBACK RUNNINGMTU:65536Metric:1 (4)设置VS配置文件keepalived.conf
VS1：
# cat /etc/keepalived/keepalived.conf
# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id node1
vrrp_mcast_group4 224.0.24.111
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 24
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 571f97b2
}
virtual_ipaddress {
10.1.24.111/16 dev eth0 label eth0:1
}
}
virtual_server 10.1.24.111 80 {
delay_loop 3
lb_algo rr
lb_kind DR
protocol TCP
sorry_server 127.0.0.1 80
real_server 10.1.24.114 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 1
nb_get_retry 3
delay_before_retry 1
}
}
real_server 10.1.24.113 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 1
nb_get_retry 3
delay_before_retry 1
}
}
}
vrrp_instance VI_2 {
state BACKUP
interface eth0
virtual_router_id 25
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass 571f97b2
}
virtual_ipaddress {
10.1.24.110/16 dev eth0 label eth0:2
}
}
virtual_server 10.1.24.110 80 {
delay_loop 3
lb_algo rr
lb_kind DR
protocol TCP
sorry_server 127.0.0.1 80
real_server 10.1.24.114 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 1
nb_get_retry 3
delay_before_retry 1
}
}
real_server 10.1.24.113 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 1
nb_get_retry 3
delay_before_retry 1
}
}
}
VS2：
# cat !$
cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id node2
vrrp_mcast_group4 224.0.24.111
}
vrrp_instance VI_1 {
state BACKUP
interface eth1
virtual_router_id 24
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass 571f97b2
}
virtual_ipaddress {
10.1.24.111/16 dev eth1 label eth1:1
}
}
virtual_server 10.1.24.111 80 {
delay_loop 3
lb_algo rr
lb_kind DR
protocol TCP
sorry_server 127.0.0.1 80
real_server 10.1.24.114 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 1
nb_get_retry 3
delay_before_retry 1
}
}
real_server 10.1.24.113 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 1
nb_get_retry 3
delay_before_retry 1
}
}
}
vrrp_instance VI_2 {
state MASTER
interface eth1
virtual_router_id 25
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 571f97b2
}
virtual_ipaddress {
10.1.24.110/16 dev eth1 label eth1:2
}
}
virtual_server 10.1.24.110 80 {
delay_loop 3
lb_algo rr
lb_kind DR
protocol TCP
sorry_server 127.0.0.1 80
real_server 10.1.24.114 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 1
nb_get_retry 3
delay_before_retry 1
}
}
real_server 10.1.24.113 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 1
nb_get_retry 3
delay_before_retry 1
}
}
}
(5)只启动一个keepalived查看，两个IP都已经添加：
# ifconfig
eth0 Link encap:EthernetHWaddr 00:0C:29:DA:A5:4C
inet addr:10.1.252.36Bcast:10.1.255.255Mask:255.255.0.0
inet6 addr: fe80::20c:29ff:feda:a54c/64 Scope:Link
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
RX packets:76726 errors:0 dropped:0 overruns:0 frame:0
TX packets:12744 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:6665499 (6.3 MiB)TX bytes:1217927 (1.1 MiB)
eth0:1 Link encap:EthernetHWaddr 00:0C:29:DA:A5:4C
inet addr:10.1.24.111Bcast:0.0.0.0Mask:255.255.0.0
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
eth0:2 Link encap:EthernetHWaddr 00:0C:29:DA:A5:4C
inet addr:10.1.24.110Bcast:0.0.0.0Mask:255.255.0.0
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
lo Link encap:Local Loopback
inet addr:127.0.0.1Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNINGMTU:65536Metric:1
RX packets:381 errors:0 dropped:0 overruns:0 frame:0
TX packets:381 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:32271 (31.5 KiB)TX bytes:32271 (31.5 KiB)
(6)在客户机测试，依然成功：
# for i in `seq 10`;do curl 10.1.24.110;done
RS2
RS1
RS2
RS1
RS2
RS1
RS2
RS1
RS2
RS1
# for i in `seq 10`;do curl 10.1.24.111;done
RS1
RS2
RS1
RS2
RS1
RS2
RS1
RS2
RS1
RS2 (7)接下来把keepalived服务启动，并搭建一个DNS服务器，www.hill.com两条A记录分别指向10.1.24.110和10.1.24.111即可
配置DNS
(8)添加域
# tail -14 /etc/named.conf
zone "hillboy.com" IN {
type master;
file "hillboy.zone";
};
include "/etc/named.rfc1912.zones";
include "/etc/named.root.key"; (9)添加RR：
# cat /var/named/hillboy.zone
$TTL 86400
@ IN SOA ns.hillboy.com. admin.hillboy.com. (
1015
1H
30M
1W
1D
)
@ IN NS ns.hillboy.com.
ns IN A 10.1.24.18
www IN A 10.1.24.111
www IN A 10.1.24.110
(10)访问测试，已然成功：
# for I in `seq 10`;do curl www.hill.com;done
RS1
RS2
RS1
RS2
RS1
RS2
RS1
RS2
RS1
RS2
至此，DNS+keepalived+lvs实现高可用负载均衡集群的实验已然顺利结束，更多文章请关注我的博客。
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