标签：lvs keepalived
lvs+keepalived健康检查
LVS是Linux Virtual Server的简称，即Linux虚拟服务器。使用LVS技术要达到的目标是：通过LVS提供的负载均衡技术和Linux操作系统实现一个高性能、高可用的服务器群集，它具有良好可靠性、可扩展性和可操作性。从而以低廉的成本实现最优的服务性能。
1，在Master配置接口IP如下：
[root@localhost network-scripts]# ifconfig
ens33:flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.230.10 netmask255.255.255.0 broadcast 192.168.230.255
inet6 fe80::250:56ff:fe9a:55c5 prefixlen 64 scopeid0x20<link>
ether 00:50:56:9a:55:c5 txqueuelen 1000 (Ethernet)
RX packets 1201 bytes 94251 (92.0KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 5964 bytes 390181(381.0 KiB)
TX errors 0 dropped 0 overruns0 carrier 0 collisions 0
ens33:0:flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.230.100 netmask255.255.255.255 broadcast192.168.230.100
ether 00:50:56:9a:55:c5 txqueuelen 1000 (Ethernet)
2，在Slave配置接口IP如下：
[root@localhost ~]# ifconfig
ens33:flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.230.11 netmask255.255.255.0 broadcast 192.168.230.255
inet6 fe80::250:56ff:fe9a:62e8 prefixlen 64 scopeid0x20<link>
ether 00:50:56:9a:62:e8 txqueuelen 1000 (Ethernet)
RX packets 3 bytes 620 (620.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 50 bytes 7844 (7.6KiB)
TX errors 0 dropped 0 overruns0 carrier 0 collisions 0
ens33:0:flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.230.100 netmask255.255.255.255 broadcast192.168.230.100
ether 00:50:56:9a:62:e8 txqueuelen 1000 (Ethernet)
3，在rs1上配置接口IP如下：
[root@localhost]# ifconfig
ens33:flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.230.12 netmask255.255.255.0 broadcast 192.168.230.255
inet6 fe80::250:56ff:fe9a:daa prefixlen 64 scopeid0x20<link>
ether 00:50:56:9a:0d:aa txqueuelen 1000 (Ethernet)
RX packets 162543 bytes 11199233(10.6 MiB)
RX errors 0 dropped 66 overruns 0 frame 0
TX packets 74236 bytes 9216209(8.7 MiB)
TX errors 0 dropped 0 overruns0 carrier 0 collisions 0
lo:0:flags=73<UP,LOOPBACK,RUNNING> mtu65536
inet 192.168.230.100 netmask255.255.255.255
loop txqueuelen 0 (Local Loopback)
4，在rs2上配置接口IP如下：
[root@localhost]# ifconfig
ens33:flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.230.13 netmask255.255.255.0 broadcast 192.168.230.255
inet6 fe80::250:56ff:fe9a:2be1 prefixlen 64 scopeid0x20<link>
ether 00:50:56:9a:2b:e1 txqueuelen 1000 (Ethernet)
RX packets 161840 bytes 11150452(10.6 MiB)
RX errors 0 dropped 44 overruns 0 frame 0
TX packets 73427 bytes 7893814(7.5 MiB)
TX errors 0 dropped 0 overruns0 carrier 0 collisions 0
lo:0: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 192.168.230.100 netmask255.255.255.255
loop txqueuelen 0 (Local Loopback)
5，在Master和Slave上开启转发功能
[root@localhost ~]# echo "1">/proc/sys/net/ipv4/ip_forward
6，在rs1和rs2配置接口属性
[root@localhost ~]# echo "1">/proc/sys/net/ipv4/conf/lo/arp_ignore
[root@localhost ~]# echo "2">/proc/sys/net/ipv4/conf/lo/arp_announce
[root@localhost ~]# echo "1">/proc/sys/net/ipv4/conf/all/arp_ignore
[root@localhost ~]# echo "2">/proc/sys/net/ipv4/conf/all/arp_announce
[root@localhost ~]# sysctl -p
net.ipv4.conf.ens33.arp_announce = 2
net.ipv4.conf.ens33.arp_ignore = 1
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.lo.arp_ignore = 1
1，在Master上安装ipvsadm和keepalived
[root@localhost ~]# yum install -ykeepalived ipvsadm
2，同样在Slave上安装ipvsadm和keepalived
[root@localhost ~]# yum install -ykeepalived ipvsadm
3，在rs1和rs2安装测试服务，这里安装httpd服务，具体服务配置请参考官方配置文档。
[root@localhost htdocs]# yum install -yhttpd
访问192.168.230.12服务：
访问192.168.230.13服务：
1，TCP健康检查配置如下：
[root@localhost keepalived]# catkeepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
acassen@test.com
failover@test.com
sysadmin@test.com
}
notification_email_from Alexandre.Cassen@test.com
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER
interface ens33
virtual_router_id 55
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.230.100
}
}
virtual_server 192.168.230.100 80 {
delay_loop 6
lb_algo rr
lb_kind DR
#persistence_timeout 50
protocol TCP
real_server 192.168.230.12 80 {
weight 1
TCP_CHECK { #tcp健康检查
connect_port 80
connect_timeout 3
Nb_get_retry 3 #最大重试次数
delay_before_retry 5 #重试延时
}
}
real_server 192.168.230.13 80 {
weight 1
TCP_CHECK {
connect_port 80
connect_timeout 3
Nb_get_retry 3
delay_before_retry 5
}
}
}
2，http健康检查配置
[root@localhost ~]# cat/etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
acassen@test.com
failover@test.com
sysadmin@test.com
}
notification_email_from Alexandre.Cassen@test.com
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER
interface ens33
virtual_router_id 55
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.230.100
}
}
virtual_server 192.168.230.100 80 {
delay_loop 6
lb_algo rr
lb_kind DR
#persistence_timeout 50
protocol TCP
real_server 192.168.230.12 80 {
weight 1
HTTP_GET {
url {
path /index.html
digest00f6c72507d2480429e5f32dbf2de638
#digest是根据hash算出来的，算法如下：
# /usr/bin/genhash -s 192.168.230.13 -p 80-u /index.html
#注意！如果不加digest经测试发现，当rs服务down掉后又恢复，lvs不能
#恢复调度到此rs上。即健康检查不能恢复
}
connect_port 80
connect_timeout 3
nb_get_retry 3
delay_before_retry 5
}
}
real_server 192.168.230.13 80 {
weight 1
HTTP_GET {
url {
path /index.html
digest4b0f20d78e6098eb5c2eed901f5f3b6e
#digest是根据hash算出来的，算法如下：
# /usr/bin/genhash -s 192.168.230.13 -p 80-u /index.html
}
connect_port 80
connect_timeout 3
nb_get_retry 3
delay_before_retry 5
}
}
}
3，配置完在Master和Slave上重启keepalived服务
[root@localhost keepalived]# servicekeepalived restart
1，将rs1的httpd服务关闭，在客户端访问。
2，抓包查看，每5s发送一次重传检查报文。
3，http健康检查报文，每6秒发送一次请求。
本文出自 “丁同学1990” 博客，请务必保留此出处http://dingtongxue1990.blog.51cto.com/4959501/1842325
标签：lvs keepalived
原文地址：http://dingtongxue1990.blog.51cto.com/4959501/1842325
