本文主要是介绍LB/LVS之KeepAlived总结，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
lvs+keepalive
keepalive结合LVS三种工作模式（nat dr tuunl）
客户端：192.168.1.1/24
Director1:192.168.1.2/24 eth1
Director2:192.168.1.2/24 eth1
node1:192.168.1.10/24 vip loop0:192.168.1.100/32
node2:192.168.2.10/24 vip loop0:192.168.1.100/32
1.每台写好host文件 做好基本设置
IP, hostname, hosts, iptables, SELinux, ssh trust, ntp
[root@client1 ~]# cat /etc/hosts
127.0.0.1 localhost
192.168.122.2 director1.uplook.com director1
192.168.122.3 director2.uplook.com director1
192.168.122.10 node1.uplook.com node1
192.168.122.20 node2.uplook.com node2
2. RS配置
配置好网站服务器，测试所有RS //为了测试效果，提供不同的页面
node1/2: ip addr add dev lo 192.168.122.100/32 //在lo接口上绑定VIP
方法一：不对VIP的ARP请求响应
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore //non-arp
echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
方法二：不对VIP的ARP请求响应
arptables -A IN -d 192.168.122.100 -j DROP
arptables -A OUT -s 192.168.122.100 -j mangle --mangle-ip-s <real_ip>
service arptables_jf save
chkconfig arptables_jf on
3.所有调度器
yum -y install ipvsadm keepalived
源码安装方法
ipvsadm
[root@Director1 ~]# yum -y install ipvsadm kernel-headers kernel-devel openssl-devel popt-devel
KeepAlived
[root@Director1 keepalived-1.2.1]# ./configure --prefix=/ --with-kernel-dir=/usr/src/kernels/2.6.32-358.el6.x86_64/
Keepalived configuration
---------------------------------------------
Keepalived version : 1.2.1
Compiler : gcc
Compiler flags : -g -O2 -DETHERTYPE_IPV6=0x86dd
Extra Lib : -lpopt -lssl -lcrypto
Use IPVS Framework : Yes
IPVS sync daemon support : Yes
Use VRRP Framework : Yes
Use Debug flags : No
[root@Director1 keepalived-1.2.1]# make
[root@Director1 keepalived-1.2.1]# make install
cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id director1 要唯一
}
vrrp_instance VI_1 {
state MASTER 备设置为backup
interface eth1 心跳网卡
virtual_router_id 80 id号两边一致
priority 100 优先级 主设置高一些
advert_int 1 同步时间间隔
authentication { 认证
auth_type PASS
auth_pass 1111
}
virtual_ipaddress { 设置vip
192.168.1.100
}
}
virtual_server 192.168.1.100 80 {
delay_loop 6 健康检查时间间隔
lb_algo rr 负载均衡调度算法
lb_kind DR 负载均衡转发规则
nat_mask 255.255.255.0
#persistence_timeout 50 会话保持
protocol TCP
inhibit_on_failure来设置如果服务器健康检查失败,将其weight设置为0,而不是直接从ipvs里面删除.
real_server 192.168.1.10 80 {
weight 1
TCP_CHECK {
connect_timeout 3 表示连接超时时间,这里连接real server的端口超过10秒没有反映,则将realserver踢出lvs,或将权值清0.
nb_get_retry 3 表示连接的重试次数,这里如果3次都连接失败,则将realserver踢出lvs,或将权值清0.
delay_before_retry 3 表示每次连接重试的间隔,这里的间隔是3秒.
connect_port 80 表示连接测试的端口.
}
}
real_server 192.168.1.20 80 {
weight 1
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
4. chkconfig keepalived on
service keepalived start
tail -f /var/log/messages
ipvsadm -Ln -c
二、测试
所有分发器和Real Server都正常
主分发器故障及恢复
Real Server故障及恢复
三、Keepalived不抢占
nopreempt 仅针对BACKUP
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