keepalived+haproxy安装配置

Posted 2020-10-20

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keepalived

keepalived是VRRP协议的完美实现，最早是为lvs设计的高可用模块。
VRRP协议：解决静态路由单点故障的问题太。VRRP通过竞选协议来实现虚拟路由器的功能，
所有的协议报文都是通过IP多播（组播）（组播地址224.0.0.18）对外表现为一个周知的MAC地址
00-00-5E-00-01-X，对外不管谁是MASTER，都是同样的MAC和IP。

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配置后端httpd服务端口都为8080
vim /etc/httpd/conf/httpd.conf
Listen 8080

service httpd restart
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两台他同时安装haproxy
yum install haproxy -y
vim /etc/haproxy/haproxy.cfg
frontend http_front #前端网页配置
mode http #默认mode是http
bind *:80
stats uri /haproxy?stats
default_backend http_back

backend http_back
balance roundrobin #默认算法轮询，也可以是source相当于nginx的ip_hash,cookie
option httpchk GET /index.html #默认检查端口，基于url的健康检查，ngingx不支持
option forwardfor header X-REAL-IP #客户端真实ip，后端程序通过X-REAL-IP获取
server linux-node1 192.168.56.20:8080 check inter 2s rise 3 fall 4 weight 2 #inter 2s 两秒检查 rise 3 3次ok才正常4次ng才失败
server linux-node2 192.168.56.21:8080 check inter 2s rise 3 fall 4 weight 1

service haproxy start
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安装keepalived
yum install keepalived -y

vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
notification_email {
[email protected]

}
notification_email_from [email protected]
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id haproxy-ha

}

vrrp_instance VI_1 {
state MASTER #角色 另外改BACKUP
interface eth0 #网卡
virtual_router_id 51 #不能重复
priority 150 #权重 另外改100
advert_int 1 #检查时间默认1s
authentication {
auth_type PASS
auth_pass haproxy_ha
}
virtual_ipaddress {
192.168.56.22
192.168.56.23

}

}

下面暂时不用配置
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启动keepalived

service keepalived start

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查看ip是否绑定
ip ad li
[[email protected] ~]# ip ad li
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:40:82:2f brd ff:ff:ff:ff:ff:ff
inet 192.168.56.20/24 brd 192.168.56.255 scope global eth0
inet 192.168.56.22/32 scope global eth0
inet 192.168.56.23/32 scope global eth0
inet6 fe80::20c:29ff:fe40:822f/64 scope link
valid_lft forever preferred_lft forever
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停止master的keepalived服务，看backup是否获取ip
service keepalived stop

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开启master的keepalived服务，看master是否获取
service keepalived stop

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抓包可见ip 224.0.0.18
[[email protected] ~]# tcpdump -n ‘host 224.0.0.18‘
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
19:50:29.152236 IP 192.168.56.20 > 224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 150, authtype simple, intvl 1s, length 24
19:50:30.157829 IP 192.168.56.20 > 224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 150, authtype simple, intvl 1s, length 24
19:50:31.159852 IP 192.168.56.20 > 224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 150, authtype simple, intvl 1s, length 24
19:50:32.165625 IP 192.168.56.20 > 224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 150, authtype simple, intvl 1s, length 24
19:50:33.167739 IP 192.168.56.20 > 224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 150, authtype simple, intvl 1s, length 24
19:50:34.176987 IP 192.168.56.20 > 224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 150, authtype simple, intvl 1s, length 24
19:50:35.183179 IP 192.168.56.20 > 224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 150, authtype simple, intvl 1s, length 24
19:50:36.185416 IP 192.168.56.20 > 224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 150, authtype simple, intvl 1s, length 24
19:50:37.187998 IP 192.168.56.20 > 224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 150, authtype simple, intvl 1s, length 24
19:50:38.192458 IP 192.168.56.20 > 224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 150, authtype simple, intvl 1s, length 24
19:50:39.194564 IP 192.168.56.20 > 224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 150, authtype simple, intvl 1s, length 24