keepalived 是解决单故障节点的软件

1、 keepalived+LVS/DR2、 任意单故障节点 的 高可用作 分发器 的 高可用用 keepalived 作 LVS/DR 模式 分发器 的 高可用实验拓扑clientnode1主、node2备webA 、webB

浮动资源有: 浮动ip、策略

IP 规划

client 192.168.4.254node1 192.168.4.50node2 192.168.4.55浮动ip（vip） 192.168.4.252webA 192.168.4.51webB 192.168.4.52

配置步骤

#chkconfig iptables off #取消开机自起#service iptables stop #关闭防火墙#setenforce 0 #关闭selinux

1 配置好网络环境 所有地址的IP

#vim /etc/sysconfig/network-scripts/ifcfg-eth0DEVICE=eth0ONBOOT=yesBOOTPROTO=staticIPADDR=192.168.4.50NETMASK=255.255.255.0GATEWAY=192.168.4.10DNS1=202.106.0.20...#service network restart #systemctl restart NetworkManager

2 配置webA、B 服务自定义Web页面

#yum install -y httpd#echo “192.168.4.51” > /var/www/html/index.html#echo “192.168.4.52” > /var/www/html/index.html#service httpd start ; chkconfig httpd on #rhel6#systemctl start httpd;systemctl enable httpd #rhel7

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配置webA、B的vip 和DR模式的网络配置

临时修改方法可写在/etc/rc.local文件里开机执行#ifconfig lo:1 192.168.4.252/32#echo 1 > /proc/sys/net/ipv4/conf/eth0/arp_ignore#echo 2 > /proc/sys/net/ipv4/conf/eth0/arp_announce#echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore#echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce

永久修改方法#vim /etc/sysctl.conf.. ..net.ipv4.conf.all.arp_ignore = 1net.ipv4.conf.lo.arp_ignore = 1net.ipv4.conf.lo.arp_announce = 2net.ipv4.conf.all.arp_announce = 2#sysctl -p

在node1、node2 分别安装 keepalived 软件包

#yum -y install keepalived ipvsadm 修改配置node1#vim /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 192.168.200.1   smtp_connect_timeout 30   router_id LVS_DEVEL}vrrp_instance VI_1 {    state MASTER    interface eth0    virtual_router_id 51    priority 150    advert_int 1    authentication {    auth_type PASS    auth_pass 1111    }    virtual_ipaddress {    192.168.4.252    }}virtual_server 192.168.4.252 80 {    delay_loop 6    lb_algo rr  #集群算法    lb_kind DR  #DR模式    nat_mask 255.255.255.0#persistence_timeout 50 #坚持时间同一客户端50秒内访问分配同一服务器注释掉实现实时轮询    protocol TCP    connect_timeout 3    nb_get_retry 3    delay_before_retry 3    real_server 192.168.4.51 80 {    weight 1    }    real_server 192.168.4.52 80 {    weight 1    }}

node2:

#vim /etc/keepalived/keepalived.confstate MASTERpriority 150

#systemctl start keepalived#ipvsadm -Ln

验证 254: