• LVS搭建+keep


    环境

    LVS ip:131

    lvs ip :132

    web01  :126

    web02 :127

    安装过程

    rpm -qa ipvsadm

    两台LVS都要安装(一下都是两台都要安装)

    yum install ipvsadm -y
    
    rpm -qa ipvsadm 
    ipvsadm-1.26-4.el6.x86_64

    创建连接

    ln -s /usr/src/kernels/2.6.32-696.23.1.el6.x86_64/ /usr/src/linux

    (如果kernels里面是空的,yum install kernel-devel   -y)

    检查内核是否有

    lsmod |grep ip_vs
    
    
    ip_vs_rr 1420 3 
    ip_vs 126534 5 ip_vs_rr
    libcrc32c 1246 1 ip_vs
    ipv6 335589 16 ip_vs,ip6t_REJECT,nf_conntrack_ipv6,nf_defrag_ipv6

    如果没有执行(ipvsadm命令)

    配置LVS

     vip 192.168.70.5 www.daxian.com

    添加一个VIP(131)

    ip addr add 192.168.70.5/24 dev eth0 label eth0:0

    清空所有节点

    ipvsadm -C 

    -C   --clean  清空所有

    添加实例

    ipvsadm -A -t 192.168.70.5:80 -s wrr

    -A 添加一个实例,-s 算法 -t指定VIP

    添加节点

    ipvsadm -a -t 192.168.70.5:80 -r 192.168.70.126:80 -g -w 1
    
    ipvsadm -a -t 192.168.70.5:80 -r 192.168.70.127:80 -g -w 1

    -a 添加指定节点 -t指定VIP  -r 指定节点ip   -g工作模式  -w  

    优化(设置连接超时的值)

    ipvsadm --set 30 5 60

    (对应数值:tcp   tcpfin   udp)

    查看

    ipvsadm -Ln
    
    IP Virtual Server version 1.2.1 (size=4096)
    Prot LocalAddress:Port Scheduler Flags
    -> RemoteAddress:Port Forward Weight ActiveConn InActConn
    TCP 192.168.70.5:80 wrr
    -> 192.168.70.126:80 Route 1 0 0 
    -> 192.168.70.127:80 Route 1 0 0
    
     

    绑定RS端vip(web01)

    ip addr add 192.168.70.5/32 dev lo label lo:0

    添加主机路由

    route add -host 192.168.70.5 dev lo

     查看路由

    route -n

    抑制ARP(所有几点服务器都要做,web01,web02)

    echo "1" > /proc/sys/net/ipv4/conf/lo/arp_ignore     
    
    echo "2" > /proc/sys/net/ipv4/conf/lo/arp_announce
    
    echo "1" > /proc/sys/net/ipv4/conf/all/arp_ignore
    
    echo "2" > /proc/sys/net/ipv4/conf/all/arp_announce

     抑制ARP参数说明

    数值

    含义

    0(默认)

    在任意网络接口(eth0,eth1,lo)上的任何本地地址

    1

    尽量避免不在该网络接口子网段的本地地址做出arp回应. 当发起ARP请求的源IP地址 是被设置应该经由路由达到此网络接口的时候很有用.此时会检查来访IP是否为所有接口 上的子网段内ip之一.如果改来访IP不属于各个网络接口上的子网段内,那么将采用级别2的方式来进行处理.

    2

    对查询目标使用最适当的本地地址.在此模式下将忽略这个IP数据包的源地址并尝试 选择与能与该地址通信的本地地址.首要是选择所有的网络接口的子网中外出访问子网中 包含该目标IP地址的本地地址. 如果没有合适的地址被发现,将选择当前的发送网络接口 或其他的有可能接受到该ARP回应的网络接口来进行发送.

    arp_ignore定义

    对目标地定义对目标地址为本地IP的ARP询问不同的应答模式0

    数值

    含义

    0(默认值)

    回应任何网络接口上对任何本地IP地址的arp查询请求

    1

    只回答目标IP地址是来访网络接口本地地址的ARP查询请求

    2

    只回答目标IP地址是来访网络接口本地地址的ARP查询请求,且来访IP必须在该网络接口的子网段内

    3

    不回应该网络界面的arp请求,而只对设置的唯一和连接地址做出回应

    4-7

    保留未使用

    8

    不回应所有(本地地址)的arp查询

     访问192.168.70.5

     查看链接

    ipvsadm -Ln --stats
    IP Virtual Server version
    1.2.1 (size=4096) Prot LocalAddress:Port Conns InPkts OutPkts InBytes OutBytes -> RemoteAddress:Port TCP 192.168.70.5:80 8 34 0 2951 0 -> 192.168.70.126:80 4 23 0 2375 0 -> 192.168.70.127:80 4 11 0 576 0

    删除节点

    ipvsadm  -d -t 192.168.70.5:80 -r 192.168.70.126:80

    =======================keepalived+LVS==================

    Keepalived安装搭建

    首先搭建好Keepalived

    清空VIP

    ipvsadm -C
     ipvsadm -Ln
    IP Virtual Server version 1.2.1 (size=4096)
    Prot LocalAddress:Port Scheduler Flags
    -> RemoteAddress:Port Forward Weight ActiveConn InActConn

     

    配置keeplived

    global_defs {
    router_id LVS_01
    }
    
    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 {
         192.168.70.5/24
        }
    }
    
    virtual_server 192.168.70.5 80 {
        delay_loop 6              
        lb_algo wrr                
        lb_kind DR                
        nat_mask 255.255.255.0
        persistence_timeout 50     
        protocol TCP                
    
        real_server 192.168.70.126 80 {
            weight 1              
            TCP_CHECK {
            connect_timeout 8       
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
            }
        }
    
        real_server 192.168.70.127 80 {
            weight 1              
            TCP_CHECK {
            connect_timeout 8       
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
            }
        }
    }

    *删除之前配置的VIP

     ip addr del 192.168.70.5/24 dev eth0:0

    LB02 配置

    global_defs {
        router_id LVS_02
     }
     
     vrrp_instance VI_1 {
         state BACKUP
         interface eth0
         virtual_router_id 51
         priority 100
         advert_int 1
         authentication {
             auth_type PASS
             auth_pass 1111
         }
         virtual_ipaddress {
          192.168.70.5/24
         }
     }
     virtual_server 192.168.70.5 80 {
         delay_loop 6          
         lb_algo wrr                
         lb_kind DR                
         nat_mask 255.255.255.0
         persistence_timeout 50     
         protocol TCP                
     
         real_server 192.168.70.126 80 {
             weight 1              
             TCP_CHECK {
             connect_timeout 8       
             nb_get_retry 3
             delay_before_retry 3
             connect_port 80
             }
         }
     
         real_server 192.168.70.127 80 {
             weight 1              
             TCP_CHECK {
             connect_timeout 8       
             nb_get_retry 3
             delay_before_retry 3
             connect_port 80
             }
         }
     }

    启动keepalived

    /etc/init.d/keepalived start

    查看vip

    ipvsadm -Ln
    IP Virtual Server version 1.2.1 (size=4096)
    Prot LocalAddress:Port Scheduler Flags
    -> RemoteAddress:Port Forward Weight ActiveConn InActConn
    TCP 192.168.70.5:80 wrr persistent 50
    -> 192.168.70.126:80 Route 1 0 0
    -> 192.168.70.127:80 Route 1 0 0

    停止192.168.70.126试试

    /application/nginx/sbin/nginx -s stop

    查看

    ipvsadm -Ln
    IP Virtual Server version 1.2.1 (size=4096)
    Prot LocalAddress:Port Scheduler Flags
    -> RemoteAddress:Port Forward Weight ActiveConn InActConn
    TCP 192.168.70.5:80 wrr persistent 50
    -> 192.168.70.127:80 Route 1 0 0

    启动

    /application/nginx/sbin/nginx

    在此查看

    ipvsadm -Ln
    IP Virtual Server version 1.2.1 (size=4096)
    Prot LocalAddress:Port Scheduler Flags
    -> RemoteAddress:Port Forward Weight ActiveConn InActConn
    TCP 192.168.70.5:80 wrr persistent 50
    -> 192.168.70.126:80 Route 1 0 0
    -> 192.168.70.127:80 Route 1 0 0

    ================================问题出现解决办法=====================

    负载不均衡

    ipvsadm -Ln


    IP Virtual Server version 1.2.1 (size=4096)
    Prot LocalAddress:Port Scheduler Flags
    -> RemoteAddress:Port Forward Weight ActiveConn InActConn
    TCP 192.168.70.5:80 rr persistent 50
    -> 192.168.70.126:80 Route 1 0 0
    -> 192.168.70.127:80 Route 1 8 1244

    #可以吧会话保持注释掉,persistent 重启keepalivied就可以了

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  • 原文地址:https://www.cnblogs.com/sky00747/p/8669813.html
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