Linux-利用keepalived实现lvs的高可用性
单主模型IPVS示例
配置keepalive
高可用的ipvs集群示例：修改keepalived配置文件
修改主机：192.168.234.27的keepalived配置文件
1 [root@234c27 ~]# vim /etc/keepalived/keepalived.conf
2 ! Configuration File for keepalived
3
4 global_defs {
5 notification_email {
6 root@localhost //接受邮件地址
7 }
8 notification_email_from keepalived@localhost //发送邮件地址
9 smtp_server 127.0.0.1 //发送邮件服务器IP
10 smtp_connect_timeout 30 //邮件连接超时时长
11 router_id kptwo //路由id
12 vrrp _mcast_group4 234.10.10.10 //指定vrrp协议的多播地址
13 }
14
15 vrrp_instance VI_1 { //vrrp协议的
16 state MASTER //lvs的MASTER服务器
17 interface ens37 //
18 virtual_router_id 50 //虚拟路由
19 priority 100 //权重为100.越大越先
20 advert_int 1 //发送组博包的间隔
21 authentication { //验证
22 auth_type PASS //方式为pass( 明文)
23 auth_pass 1111 //密码
24 }
25 virtual_ipaddress { //keepalived虚拟ip
26 10.0.0.100/24
27 }
28 }
29 virtual_server 10.0.0.100 80 {
30 delay_loop 6 //检查后端服务器的时间间隔
31 lb_algo wrr //定义调度方法
32 lb_kind DR //集群的类型
33 #persistence_timeout 50 //持久连接时长
34 protocol TCP //服务协议，仅支持TCP
35 real_server 192.168.234.47 80 { //后端real_server服务器地址
36 weight 1 //权重
37 HTTP_GET { //应用层检测
38 url {
39 path / //定义要监控的URL
40 status_code 200 //判断上述检测机制为健康状态的响应码
41 }
42 connect_timeout 3 //连接请求的超时时长
43 nb_get_retry 3 //重试次数
44 delay_before_retry 3 //重试之前的延迟时长
45 }
46 }
47 real_server 192.168.234.57 80 {
48 weight 2
49 HTTP_GET {
50 url {
51 path /
52 status_code 200
53 }
54 connect_timeout 3
55 nb_get_retry 3
56 delay_before_retry 3
57 }
58 }
59 }
修改主机：192.168.234.37的keepalived配置文件
[root@234c37 ~]# vim /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 kptwo
vrrp _mcast_group4 234.10.10.10
}
vrrp_instance VI_1 {
state BACKUP
interface ens37
virtual_router_id 50
priority 80
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.0.0.100/24
}
}
virtual_server 10.0.0.100 80 {
delay_loop 6
lb_algo wrr
lb_kind DR
#persistence_timeout 50
protocol TCP
sorry_server 127.0.0.1:80
real_server 192.168.234.47 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.234.57 80 {
weight 2
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
查看keepalived
[root@234c37 ~]# systemctl status keepalived
● keepalived.service - LVS and VRRP High Availability Monitor
Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
Active: inactive (dead)
…………
[root@234c37 ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
//暂无ipvsadm
启动服务
[root@234c27 keepalived]# systemctl start keepalived.service
[root@234c27 keepalived]# systemctl status keepalived.service
● keepalived.service - LVS and VRRP High Availability Monitor
Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
Active: active (running) since Fri 2018-08-31 20:30:02 CST; 12s ago
Process: 9657 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 9658 (keepalived)
………………
[root@234c27 keepalived]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 10.0.0.100:80 wrr
-> 192.168.234.47:80 Route 1 0 0
-> 192.168.234.57:80 Route 2 0 0
//启动服务lvs vs已配置好
后端real_server准备
增加ip在网卡上 修改限制arp通告及应答级别 rs1 rs2都做，网关并指向路由
ip a a 10.0.0.100/32 dev ens37 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_announceroute add default gw 192.168.234.17
安装httpd服务 写好网页文件
启动服务
多主模型IPVS示例
配置keepalive
高可用的ipvs集群示例：修改keepalived配置文件
修改主机：192.168.234.27的keepalived配置文件
[root@234c27 keepalived]# vim /etc/keepalived/keepalived.conf
global_defs {
notification_email {
root@localhost
}
notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id kpone
vrrp _mcast_group4 234.10.10.10
} vrrp_instance VI_1 {
state MASTER
interface ens37
virtual_router_id 50
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.0.0.100/24
}
}
vrrp_instance VI_2 {
state BACKUP
interface ens37
virtual_router_id 51
priority 80
advert_int 1
authentication {
auth_type PASS
auth_pass 2222
}
virtual_ipaddress {
10.0.0.200/24
}
}
virtual_server 10.0.0.100 80 {
delay_loop 6
lb_algo wrr
lb_kind DR
#persistence_timeout 50
protocol TCP
#sorry_server 127.0.0.1:80
real_server 192.168.234.47 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
virtual_server 10.0.0.200 80 {
delay_loop 6
lb_algo wrr
lb_kind DR
#persistence_timeout 50
protocol TCP
#sorry_server 127.0.0.1:80
real_server 192.168.234.57 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
修改主机：192.168.234.37的keepalived配置文件
[root@234c37 ~]# vim /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 kptwo
vrrp _mcast_group4 234.10.10.10
} vrrp_instance VI_1 {
state BACKUP
interface ens37
virtual_router_id 50
priority 80
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.0.0.100/24
}
}
vrrp_instance VI_2 {
state MASTER
interface ens37
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 2222
}
virtual_ipaddress {
10.0.0.200/24
}
}
virtual_server 10.0.0.100 80 {
delay_loop 6
lb_algo wrr
lb_kind DR
#persistence_timeout 50
protocol TCP
#sorry_server 127.0.0.1:80
real_server 192.168.234.47 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
virtual_server 10.0.0.200 80 {
delay_loop 6
lb_algo wrr
lb_kind DR
#persistence_timeout 50
protocol TCP
#sorry_server 127.0.0.1:80
real_server 192.168.234.57 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
让10.0.0.100的ip优先分配至192.168.234.47 192.168.234.57备用
让10.0.0.200的ip优先分配至192.168.234.57 192.168.234.47备用
后端real_server准备
修改192.168.234.57的vip为10.0.0.200/32
1 [root@234c27 keepalived]# ipvsadm -Ln
2 IP Virtual Server version 1.2.1 (size=4096)
3 Prot LocalAddress:Port Scheduler Flags
4 -> RemoteAddress:Port Forward Weight ActiveConn InActConn
5 TCP 10.0.0.100:80 wrr
6 -> 192.168.234.47:80 Route 1 0 0
7 TCP 10.0.0.200:80 wrr
8 -> 192.168.234.57:80 Route 1 0 0
现在宕掉一个lvs
1 [root@234c27 keepalived]# systemctl stop keepalived.service
2 [root@234c27 keepalived]# ipvsadm -Ln
3 IP Virtual Server version 1.2.1 (size=4096)
4 Prot LocalAddress:Port Scheduler Flags
5 -> RemoteAddress:Port Forward Weight ActiveConn InActConn
6
依然提供服务
1 [root@234c37 ~]# ipvsadm -Ln
2 IP Virtual Server version 1.2.1 (size=4096)
3 Prot LocalAddress:Port Scheduler Flags
4 -> RemoteAddress:Port Forward Weight ActiveConn InActConn
5 TCP 10.0.0.100:80 wrr
6 -> 192.168.234.47:80 Route 1 0 21
7 TCP 10.0.0.200:80 wrr
8 -> 192.168.234.57:80 Route 1 0 39
后一个实现基于前一个的基础上修改来的
假设要实现sorry_server
1.把rs服务都停掉。然后在lvs上安装apache或者nginx服务
2.将keepalived配置文件中的
1 virtual_server 10.0.0.200 80 {
2 delay_loop 6
3 lb_algo wrr
4 lb_kind DR
5 #persistence_timeout 50
6 protocol TCP
7 #sorry_server 127.0.0.1:80 //这一行来修改 写出服务出错之后的页面
8 real_server 192.168.234.57 80 {
9 weight 1
10 HTTP_GET {
11 url {
12 path /
13 status_code 200
14 }
15 connect_timeout 3
16 nb_get_retry 3
17 delay_before_retry 3
18 }
19 }
20 }
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