LVS和keepalive

LVS：
	node01:
	ifconfig eth0:8 192.168.150.100/24
	node02~node03:
	1)修改内核： arp通告级别
	echo 1 > /proc/sys/net/ipv4/conf/eth0/arp_ignore
	echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
	echo 2 > /proc/sys/net/ipv4/conf/eth0/arp_announce
	echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
	2）设置隐藏的vip：
	ifconfig lo:3 192.168.150.100 netmask 255.255.255.255
	RS中的服务：
	node02~node03:
	yum install httpd -y
	service httpd start
	vi /var/www/html/index.html
	from 192.168.150.1x
	LVS服务配置
	node01:
	yum install ipvsadm
	ipvsadm -A -t 192.168.150.100:80 -s rr //添加lvs转发
	ipvsadm -a -t 192.168.150.100:80 -r 192.168.150.12 -g -w 1 //添加规则
	ipvsadm -a -t 192.168.150.100:80 -r 192.168.150.13 -g -w 1 //添加规则
	ipvsadm -ln //显示转发条目
	验证：
	浏览器访问 192.168.150.100 看到负载 刷新
	node01：
	netstat -natp 结论看不到socket连接
	node02~node03:
	netstat -natp 结论看到很多的socket连接
	node01:
	ipvsadm -lnc 查看偷窥记录本
	TCP 00:57 FIN_WAIT 192.168.150.1:51587 192.168.150.100:80 192.168.150.12:80
	FIN_WAIT： 连接过，偷窥了所有的包
	SYN_RECV： 基本上lvs都记录了，证明lvs没事，一定是后边网络层出问题
	keepalived实验：
	主机： node01~node04
	node01:
	ipvsadm -C
	ifconfig eth0:8 down
	----------------------------
	node01,node04:
	yum install keepalived ipvsadm -y
	配置：
	cd /etc/keepalived/
	cp keepalived.conf keepalived.conf.bak
	vi keepalived.conf
	node01:
	vrrp：虚拟路由冗余协议！
	vrrp_instance VI_1 {
	state MASTER // node04 BACKUP
	interface eth0
	virtual_router_id 51
	priority 100 // node04 50
	advert_int 1
	authentication {
	auth_type PASS
	auth_pass 1111
	}
	virtual_ipaddress {
	192.168.150.100/24 dev eth0 label eth0:3
	}
	}
	virtual_server 192.168.150.100 80 {
	delay_loop 6
	lb_algo rr
	lb_kind DR
	nat_mask 255.255.255.0
	persistence_timeout 0
	protocol TCP
	real_server 192.168.150.12 80 {
	weight 1
	HTTP_GET {
	url {
	path /
	status_code 200
	}
	connect_timeout 3
	nb_get_retry 3
	delay_before_retry 3
	}
	}
	real_server 192.168.150.13 80 {
	weight 1
	HTTP_GET {
	url {
	path /
	status_code 200
	}
	connect_timeout 3
	nb_get_retry 3
	delay_before_retry 3
	}
	} }
	scp ./keepalived.conf root@node04:`pwd`

来源：oschina

链接：https://my.oschina.net/hxd719/blog/4295009