# 全局定义 (global definition) 
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     
}
notification_email: 表示 keepalived 在发生诸如切换操作时需要发送 email 通知以及 email 发送给哪些邮件地址邮件地址可以多个每行一个
notification_email_from admin@example.com: 表示发送通知邮件时邮件源地址是谁
smtp_server 127.0.0.1: 表示发送 email 时使用的 smtp 服务器地址这里可以用本地的 sendmail 来实现
smtp_connect_timeout 30: 连接 smtp 连接超时时间
router_id node1: 机器标识，通常配置主机名

# 静态地址和路由配置范例
static_ipaddress {
    192.168.1.1/24 brd + dev eth0 scope global
    192.168.1.2/24 brd + dev eth1 scope global
}
static_routes {
    src $SRC_IP to $DST_IP dev $SRC_DEVICE
    src $SRC_IP to $DST_IP via $GW dev $SRC_DEVICE
}
 这里实际上和系统里面命令配置 IP 地址和路由一样例如 
192.168.1.1/24 brd + dev eth0 scope global 相当于: ip addr add 192.168.1.1/24 brd + dev eth0 scope global
 就是给 eth0 配置 IP 地址路由同理, 一般这个区域不需要配置 
 这里实际上就是给服务器配置真实的 IP 地址和路由的在复杂的环境下可能需要配置一般不会用这个来配置我们可以直接用 vi /etc/sysconfig/network-script/ifcfg-eth1 来配置切记这里可不是 VIP 不要搞混淆了切记切记

# VRRP 同步组 (synchroization group) 配置范例 
vrrp_sync_group VG_1 {   // 注意 vrrp_sync_group  后面可自定义名称如 lvs_httpd ,httpd
group {
http
mysql
}
notify_master /path/to/to_master.sh
notify_backup /path_to/to_backup.sh
notify_fault "/path/fault.sh VG_1"
notify /path/to/notify.sh
smtp_alert 
}
 其中 http 和 mysql 是实例名和下面的实例名一致 
notify_master /path/to/to_master.sh // 表示当切换到 master 状态时要执行的脚本
notify_backup /path_to/to_backup.sh // 表示当切换到 backup 状态时要执行的脚本
notify_fault "/path/fault.sh VG_1"  // keepalived 出现故障时执行的脚本
notify /path/to/notify.sh  
smtp_alert           // 表示切换时给 global defs 中定义的邮件地址发送邮件通知

# VRRP 实例(instance) 配置范例
vrrp_instance http {  // 注意 vrrp_instance 后面可自定义名称如 lvs_httpd ,httpd
state MASTER
interface eth0
dont_track_primary
track_interface {
eth0
eth1
}
mcast_src_ip <IPADDR>
garp_master_delay 10
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
autp_pass 1234
}
virtual_ipaddress {
#<IPADDR>/<MASK> brd <IPADDR> dev <STRING> scope <SCOPT> label <LABEL>
192.168.200.17/24 dev eth1
192.168.200.18/24 dev eth2 label eth2:1
}
virtual_routes {
# src <IPADDR> [to] <IPADDR>/<MASK> via|gw <IPADDR> dev <STRING> scope <SCOPE> tab
src 192.168.100.1 to 192.168.109.0/24 via 192.168.200.254 dev eth1
192.168.110.0/24 via 192.168.200.254 dev eth1
192.168.111.0/24 dev eth2
192.168.112.0/24 via 192.168.100.254
}
nopreempt
preemtp_delay 300
debug
}

# VRRP 脚本 
# 如下所示为相关配置示例
vrrp_script check_running {
   script "/usr/local/bin/check_running"
   interval 10
   weight 10
}

vrrp_instance http {
   state BACKUP
   smtp_alert
   interface eth0
   virtual_router_id 101
   priority 90
   advert_int 3
   authentication {
   auth_type PASS
   auth_pass whatever
   }
   virtual_ipaddress {
   1.1.1.1
   }
   track_script {
   check_running 
   }
}
# 首先在 vrrp_script 区域定义脚本名字和脚本执行的间隔和脚本执行的优先级变更, 如下所示:
vrrp_script check_running {
            script "/usr/local/bin/check_running"
            interval 10     # 脚本执行间隔
            weight 10       # 脚本结果导致的优先级变更 10 表示优先级 + 10-10 则表示优先级 - 10
            }
# 然后在实例(vrrp_instance) 里面引用有点类似脚本里面的函数引用一样先定义后引用函数名
track_script {
      check_running 
}

#HTTP/HTTPS 方式 
HTTP_GET|SSL_GET {      # 设置健康检查方式

url {                   # 设置要检查的 URL 可以有多个
path /                  # 设置 URL 具体路径
digest <STRING>         # 检查后的摘要信息这些摘要信息可以通过 genhash 命令工具获取                                   
status_code 200         # 设置返回状态码
}
connect_port 80         # 设置监控检查的端口
bindto  <IPADD>         # 设置健康检查的 IP 地址
connect_timeout   3     # 设置连接超时时间
nb_get_retry  3         # 设置重连次数
delay_before_retry  2   # 设置重连间隔
} 

#TCP 方式  
TCP_CHECK     {
connect_port 80         # 设置监控检查的端口
bindto  <IPADD>         # 设置健康检查的 IP 地址
connect_timeout   3     # 设置连接超时时间
nb_get_retry  3         # 设置重连次数
delay_before_retry  2   # 设置重连间隔
}
#SMTP 方式 (这个可以用来给邮件服务器做集群)
SMTP_CHECK {
host {
connect_ip <IP ADDRESS>
connect_port <PORT>     # 默认检查 25 端口
14 KEEPALIVED
bindto <IP ADDRESS>
}
connect_timeout <INTEGER>
retry <INTEGER>
delay_before_retry <INTEGER>
helo_name <STRING>|<QUOTED-STRING>
} 

#MISC 方式 这个可以用来检查很多服务器只需要自己会些脚本即可
MISC_CHECK {
misc_path <STRING>|<QUOTED-STRING>  # 外部程序或脚本
misc_timeout <INT>                  # 脚本或程序执行超时时间
misc_dynamic                                              
# 这个就很好用了可以非常精确的来调整权重是后端每天服务器的压力都能均衡调配这个主要是通过执行的程序或脚本返回的状态代码来动态调整 weight 值使权重根据真实的后端压力来适当调整不过这需要有过硬的脚本功夫才行哦
# 返回 0 健康检查没问题不修改权重
# 返回 1 健康检查失败权重设置为 0
# 返回 2-255 健康检查没问题但是权重却要根据返回代码修改为返回码 - 2 例如如果程序或脚本执行后返回的代码为 200# 那么权重这回被修改为 200-2
}

[root@sg-gop-10-65-32-140 wangao]# 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 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_skip_check_adv_addr
   vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.200.16
        192.168.200.17
        192.168.200.18
    }
}

virtual_server 192.168.200.100 443 {
    delay_loop 6
    lb_algo rr
    lb_kind NAT
    persistence_timeout 50
    protocol TCP

    real_server 192.168.201.100 443 {
        weight 1
        SSL_GET {
            url {
              path /
              digest ff20ad2481f97b1754ef3e12ecd3a9cc
            }
            url {
              path /mrtg/
              digest 9b3a0c85a887a256d6939da88aabd8cd
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}

virtual_server 10.10.10.2 1358 {
    delay_loop 6
    lb_algo rr
    lb_kind NAT
    persistence_timeout 50
    protocol TCP

    sorry_server 192.168.200.200 1358

    real_server 192.168.200.2 1358 {
        weight 1
        HTTP_GET {
            url {
              path /testurl/test.jsp
              digest 640205b7b0fc66c1ea91c463fac6334d
            }
            url {
              path /testurl2/test.jsp
              digest 640205b7b0fc66c1ea91c463fac6334d
            }
            url {
              path /testurl3/test.jsp
              digest 640205b7b0fc66c1ea91c463fac6334d
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }

    real_server 192.168.200.3 1358 {
        weight 1
        HTTP_GET {
            url {
              path /testurl/test.jsp
              digest 640205b7b0fc66c1ea91c463fac6334c
            }
            url {
              path /testurl2/test.jsp
              digest 640205b7b0fc66c1ea91c463fac6334c
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}

virtual_server 10.10.10.3 1358 {
    delay_loop 3
    lb_algo rr
    lb_kind NAT
    persistence_timeout 50
    protocol TCP

    real_server 192.168.200.4 1358 {
        weight 1
        HTTP_GET {
            url {
              path /testurl/test.jsp
              digest 640205b7b0fc66c1ea91c463fac6334d
            }
            url {
              path /testurl2/test.jsp
              digest 640205b7b0fc66c1ea91c463fac6334d
            }
            url {
              path /testurl3/test.jsp
              digest 640205b7b0fc66c1ea91c463fac6334d
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }

    real_server 192.168.200.5 1358 {
        weight 1
        HTTP_GET {
            url {
              path /testurl/test.jsp
              digest 640205b7b0fc66c1ea91c463fac6334d
            }
            url {
              path /testurl2/test.jsp
              digest 640205b7b0fc66c1ea91c463fac6334d
            }
            url {
              path /testurl3/test.jsp
              digest 640205b7b0fc66c1ea91c463fac6334d
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}

[root@d126009 wangao]# ipvsadm -h
ipvsadm v1.27 2008/5/15 (compiled with popt and IPVS v1.2.1)
Usage:
  ipvsadm -A|E -t|u|f service-address [-s scheduler] [-p [timeout]] [-M netmask] [--pe persistence_engine] [-b sched-flags]
  ipvsadm -D -t|u|f service-address
  ipvsadm -C
  ipvsadm -R
  ipvsadm -S [-n]
  ipvsadm -a|e -t|u|f service-address -r server-address [options]
  ipvsadm -d -t|u|f service-address -r server-address
  ipvsadm -L|l [options]
  ipvsadm -Z [-t|u|f service-address]
  ipvsadm --set tcp tcpfin udp
  ipvsadm --start-daemon state [--mcast-interface interface] [--syncid sid]
  ipvsadm --stop-daemon state
  ipvsadm -h

Commands:
Either long or short options are allowed.
  --add-service     -A        add virtual service with options
  --edit-service    -E        edit virtual service with options
  --delete-service  -D        delete virtual service
  --clear           -C        clear the whole table
  --restore         -R        restore rules from stdin
  --save            -S        save rules to stdout
  --add-server      -a        add real server with options
  --edit-server     -e        edit real server with options
  --delete-server   -d        delete real server
  --list            -L|-l     list the table
  --zero            -Z        zero counters in a service or all services
  --set tcp tcpfin udp        set connection timeout values
  --start-daemon              start connection sync daemon
  --stop-daemon               stop connection sync daemon
  --help            -h        display this help message

Options:
  --tcp-service  -t service-address   service-address is host[:port]
  --udp-service  -u service-address   service-address is host[:port]
  --fwmark-service  -f fwmark         fwmark is an integer greater than zero
  --ipv6         -6                   fwmark entry uses IPv6
  --scheduler    -s scheduler         one of rr|wrr|lc|wlc|lblc|lblcr|dh|sh|sed|nq,
                                      the default scheduler is wlc.
  --pe            engine              alternate persistence engine may be sip,
                                      not set by default.
  --persistent   -p [timeout]         persistent service
  --netmask      -M netmask           persistent granularity mask
  --real-server  -r server-address    server-address is host (and port)
  --gatewaying   -g                   gatewaying (direct routing) (default)
  --ipip         -i                   ipip encapsulation (tunneling)
  --masquerading -m                   masquerading (NAT)
  --weight       -w weight            capacity of real server
  --u-threshold  -x uthreshold        upper threshold of connections
  --l-threshold  -y lthreshold        lower threshold of connections
  --mcast-interface interface         multicast interface for connection sync
  --syncid sid                        syncid for connection sync (default=255)
  --connection   -c                   output of current IPVS connections
  --timeout                           output of timeout (tcp tcpfin udp)
  --daemon                            output of daemon information
  --stats                             output of statistics information
  --rate                              output of rate information
  --exact                             expand numbers (display exact values)
  --thresholds                        output of thresholds information
  --persistent-conn                   output of persistent connection info
  --nosort                            disable sorting output of service/server entries
  --sort                              does nothing, for backwards compatibility
  --ops          -o                   one-packet scheduling
  --numeric      -n                   numeric output of addresses and ports
  --sched-flags  -b flags             scheduler flags (comma-separated)

# 每台 realserver index.html 文件内容为 ip 地址，例如 httpd： 
echo "172.27.233.43" > /var/www/html/index.html
echo "172.27.233.44" > /var/www/html/index.html

# Nginx test
echo "rs1" > /usr/share/nginx/html/index.html
echo "rs2" > /usr/share/nginx/html/index.html

# 启动 http 服务 
/etc/init.d/httpd start

# 客户端模拟请求
for((i=1;i<=10;i++));do curl http://172.27.233.45/; done
172.27.233.44 
172.27.233.43 
172.27.233.44 
172.27.233.43 
172.27.233.44 
172.27.233.43 
172.27.233.44 
172.27.233.43 
172.27.233.44 
172.27.233.43 

# 请求分配结果
ipvsadm -Ln --stats
IP Virtual Server version 1.2.1 (size=4096) 
Prot LocalAddress:Port               Conns   InPkts  OutPkts  InBytes OutBytes 
  -> RemoteAddress:Port 
TCP  172.27.233.45:80                   10      50        0     4330        0 
  -> 172.27.233.43:80                    5       25        0     2165        0 
  -> 172.27.233.44:80                    5       25        0     2165        0 

 参数含义 
--stats 显示统计信息 
Prot LocalAddress:Port Conns InPkts OutPkts InBytes OutBytes 
                       连接数 输入包 输出包 输入流量 输出流量 

# 实时观察
watch ipvsadm -Ln --stats

# 关闭防火墙
systemctl disable firewalld
systemctl stop firewalld

# 禁用 selinux
setenforce 0
vi /etc/selinux/config

SELINUX=disabled

# 安装 keepalived,ipvsadm
yum install keepalived ipvsadm -y

# 开启 LVS 服务器的 IP 路由转发功能
echo "1" > /proc/sys/net/ipv4/ip_forward
# 添加路由转发至 sysctl.conf
vi /etc/sysctl.conf
net.ipv4.ip_forward = 1

sysctl -p

# 如果开启防火墙，请添加 VRRP 白名单
# For keepalived
# allow vrrp
-A INPUT -p vrrp -j ACCEPT
-A INPUT -p igmp -j ACCEPT
# allow multicast
-A INPUT -d 224.0.0.18 -j ACCEPT

# 编辑 keepalived 配置文件
vi /etc/keepalived/keepalived.conf

vrrp_sync_group VI_GOP_NC1_HA {
    group {
        VI_GOP_NC1_HA_PRI
    }
}

vrrp_instance VI_GOP_NC1_HA_PRI {
    state BACKUP
    interface bond0
    virtual_router_id 139
    priority 100
    advert_int 1
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        10.65.33.139/23 dev bond0
    }
}

# Install keepalived
# Ubuntu
apt-get install keepalived ipvsadm
# CentOS
yum install keepalived ipvsadm

# update iptables
vim /etc/sysconfig/iptables

# For keepalived:
# allow vrrp 
-A INPUT -p vrrp -j ACCEPT
-A INPUT -p igmp -j ACCEPT
# allow multicast
-A INPUT -d 224.0.0.18 -j ACCEPT

# reload iptables
service iptables reload

# open ip_forward
echo "1" > /proc/sys/net/ipv4/ip_forward
# edit sysctl.conf
vi /etc/sysctl.conf
net.ipv4.ip_forward = 1

sysctl -p

# keepalived for lvs-nat
vim /etc/keepalived/keepalived.conf

vrrp_sync_group NC-MAIN-API {
    group {
        NC-MAIN-API-PUB
    }
}

vrrp_instance NC-MAIN-API-PUB {
    state BACKUP
    interface bond1
    virtual_router_id 222
    priority 100
    advert_int 1
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        xx.xx.xx.xx/25 dev bond1
    }
}

virtual_server xx.xx.xx.xx 15000 {
    delay_loop 6
    lb_algo rr
    lb_kind NAT
    protocol TCP

    real_server 10.71.12.69 15000 {
        weight 100
        TCP_CHECK {
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 3
                connect_port 15000
        }
    }
    real_server 10.71.12.76 15000 {
        weight 100
        TCP_CHECK {
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 3
                connect_port 15000
        }
    }
}

# Install keepalived
# Ubuntu
apt-get install keepalived ipvsadm
# CentOS
yum install keepalived ipvsadm

# update iptables
vim /etc/sysconfig/iptables

# For keepalived:
# allow vrrp 
-A INPUT -p vrrp -j ACCEPT
-A INPUT -p igmp -j ACCEPT
# allow multicast
-A INPUT -d 224.0.0.18 -j ACCEPT

# reload iptables
service iptables reload

# open ip_forward
echo "1" > /proc/sys/net/ipv4/ip_forward
# edit sysctl.conf
vi /etc/sysctl.conf
net.ipv4.ip_forward = 1

sysctl -p

# keepalived for lvs-dr
vim /etc/keepalived/keepalived.conf

vrrp_sync_group GOP {
    group {
        VI_PRI_CONNECT
        VI_PRI_AUTH
    }
}

vrrp_instance VI_PRI_CONNECT {
    state BACKUP
    interface bond0
    virtual_router_id 128
    priority 100
    advert_int 1
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        10.65.32.28/23 dev bond0
    }
}

virtual_server 10.65.32.28 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    protocol TCP

    real_server 10.65.32.13 80 {
        weight 100
        TCP_CHECK {
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 3
                connect_port 80
        }
    }
    real_server 10.65.32.14 80 {
        weight 100
        TCP_CHECK {
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 3
                connect_port 80
        }
    }
}

virtual_server 10.65.32.28 443 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    protocol TCP

    real_server 10.65.32.13 443 {
        weight 100
        TCP_CHECK {
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 3
                connect_port 443
        }
    }
    real_server 10.65.32.14 80 {
        weight 100
        TCP_CHECK {
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 3
                connect_port 443
        }
    }
}

vrrp_instance VI_PRI_AUTH {
    state BACKUP
    interface bond0
    virtual_router_id 129
    priority 100
    advert_int 1
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        10.65.32.29/23 dev bond0
    }
}

virtual_server 10.65.32.29 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    protocol TCP

    real_server 10.65.32.22 80 {
        weight 100
        TCP_CHECK {
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 3
                connect_port 80
        }
    }
    real_server 110.65.32.23 80 {
        weight 100
        TCP_CHECK {
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 3
                connect_port 80
        }
    }
}

virtual_server 10.65.32.29 443 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    protocol TCP

    real_server 10.65.32.22 443 {
        weight 100
        TCP_CHECK {
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 3
                connect_port 443
        }
    }
    real_server 110.65.32.23 443 {
        weight 100
        TCP_CHECK {
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 3
                connect_port 443
        }
    }
}


# enable and start keepalived
systemctl start keepalived
systemctl enable keepalived
watch ipvsadm -L -n --stats

# add TYPE=Loopback
echo "TYPE=Loopback" >> /etc/sysconfig/network-scripts/ifcfg-lo
# add ifcfg-lo:0
cat > /etc/sysconfig/network-scripts/ifcfg-lo:0 << EOF
DEVICE=lo:0
IPADDR=10.65.32.28
NETMASK=255.255.255.255
ONBOOT=yes
EOF

# ifup lo:0
ifup lo:0

# add real_start
cat > /root/real_start.sh << EOF
#!/bin/bash
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
EOF

# chmod 755
chmod 755 /root/real_start.sh

# add real.service
cat > /usr/lib/systemd/system/real.service << EOF
[Unit]
Description=autostart lvs real
After=network.target remote-fs.target nss-lookup.target

[Service]
Type=forking
ExecStart=/root/real_start.sh

[Install]
WantedBy=multi-user.target
EOF

# enable service
systemctl enable real.service


# lvs real server example
vim /root/lvs_real.sh

#!/bin/bash
### BEGIN INIT INFO
# Provides:
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start realserver
# Description:       Start realserver
### END INIT INFO

# change the VIP to proper value
VIP=10.65.32.28

case "$1" in
    start)

    echo "Start REAL Server"
    /sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up
    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

    ;;

    stop)

    /sbin/ifconfig lo:0 down
    echo "Stop REAL Server"
    echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
    echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
    echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
    echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce

    ;;

    restart)

    $0 stop
    $0 start

    ;;

    *)

    echo "Usage: $0 {start|stop}"
    exit 1

    ;;
esac

exit 0

# Install keepalived
# Ubuntu
apt-get install keepalived ipvsadm
# CentOS
yum install keepalived ipvsadm

# update iptables
vim /etc/sysconfig/iptables

# For keepalived:
# allow vrrp 
-A INPUT -p vrrp -j ACCEPT
-A INPUT -p igmp -j ACCEPT
# allow multicast
-A INPUT -d 224.0.0.18 -j ACCEPT

# reload iptables
service iptables reload

# open ip_forward
echo "1" > /proc/sys/net/ipv4/ip_forward
# edit sysctl.conf
vi /etc/sysctl.conf
net.ipv4.ip_forward = 1

sysctl -p

# keepalived for lvs-tun
vim /etc/keepalived/keepalived.conf

vrrp_sync_group GOP {
    group {
        VI_PRI_AUTH
    }
}

vrrp_instance VI_PRI_AUTH {
    state BACKUP
    interface em1
    virtual_router_id 11
    priority 100
    advert_int 1
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        10.10.36.11/23 dev em1
    }
}

virtual_server 10.10.36.11 80 {
    delay_loop 6
    lb_algo rr
    lb_kind TUN
    protocol TCP

    real_server 10.10.36.4 80 {
        weight 100
        TCP_CHECK {
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 3
                connect_port 80
        }
    }
    real_server 10.10.36.7 80 {
        weight 100
        TCP_CHECK {
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 3
                connect_port 80
        }
    }
}

# enable and start keepalived
systemctl start keepalived
systemctl enable keepalived
watch ipvsadm -L -n --stats


# 编写 DS 脚本，推荐用 keepalived 配置文件
#!/bin/sh
# Startup script handle the initialisation of LVS
# chkconfig: - 28 72
# description: Initialise the Linux Virtual Server for TUN
#
### BEGIN INIT INFO
# Provides: ipvsadm
# Required-Start: $local_fs $network $named
# Required-Stop: $local_fs $remote_fs $network
# Short-Description: Initialise the Linux Virtual Server
# Description: The Linux Virtual Server is a highly scalable and highly
#   available server built on a cluster of real servers, with the load
#   balancer running on Linux.
# description: start LVS of TUN
LOCK=/var/lock/lvs-tun.lock
VIP=10.10.36.11
RIP1=10.10.36.4
RIP2=10.10.36.7
. /etc/rc.d/init.d/functions

start()    {
     PID=`ipvsadm -Ln | grep ${VIP} | wc -l`
     if    [ $PID -gt 0 ];

     then
           echo "The LVS-TUN Server is already running !"
     else
           #Load the tun mod
           /sbin/modprobe tun
           /sbin/modprobe ipip
           #Set the tun Virtual IP Address
           /sbin/ifconfig tunl0 $VIP broadcast $VIP netmask 255.255.255.255 up
           /sbin/route add -host $VIP dev tunl0
           #Clear IPVS Table
           /sbin/ipvsadm -C
           #The icmp recruit setting
           echo "0" >/proc/sys/net/ipv4/ip_forward
           echo "0" >/proc/sys/net/ipv4/conf/all/send_redirects
           echo "0" >/proc/sys/net/ipv4/conf/default/send_redirects
           #Set Lvs
           /sbin/ipvsadm -At $VIP:80 -s rr
           /sbin/ipvsadm -at $VIP:80 -r $RIP1:80 -i  -w 1
           /sbin/ipvsadm -at $VIP:80 -r $RIP2:80 -i  -w 1
           /bin/touch $LOCK
           #Run Lvs
           echo "starting LVS-TUN-DIR Server is ok !"
     fi
}

stop()    {
           #stop  Lvs server
           /sbin/ipvsadm -C
           /sbin/ifconfig tunl0 down >/dev/null
           #Remove the tun mod
           /sbin/modprobe -r tun
           /sbin/modprobe -r ipip
           rm -rf $LOCK
           echo "stopping LVS-TUN-DIR server is ok !"
}

status()  {
     if [ -e $LOCK ];
     then
         echo "The LVS-TUN Server is already running !"
     else
         echo "The LVS-TUN Server is not running !"
     fi
}

case "$1" in
  start)
        start
        ;;
  stop)
        stop
        ;;
  restart)
        stop
        sleep 1
        start
        ;;
  status)
        status
        ;;
  *)
        echo "Usage: $1 {start|stop|restart|status}"
        exit 1
esac
exit 0

# 在加载好 ipip 模块后就会有默认的 tunl0 隧道
modprobe ipip

# 添加 VIP
# ifconfig tunl0 down
ifconfig tunl0 10.10.36.11 broadcast 10.10.36.11 netmask 255.255.255.255 up

# 添加路由
route add -host 10.10.36.11 tunl0

# 手动关闭 ARP 转发
echo '1' > /proc/sys/net/ipv4/conf/tunl0/arp_ignore 
echo '2' > /proc/sys/net/ipv4/conf/tunl0/arp_announce
echo '1' > /proc/sys/net/ipv4/conf/all/arp_ignore
echo '2' > /proc/sys/net/ipv4/conf/all/arp_announce 
echo '0' > /proc/sys/net/ipv4/conf/tunl0/rp_filter
echo '0' > /proc/sys/net/ipv4/conf/all/rp_filter 

# iptables 允许 ipip 协议
iptables -I INPUT 1 -p 4 -j ACCEPT
vim /etc/sysconfig/iptables
-A INPUT -p ipv4 -j ACCEPT

# 编写 RS 启停脚本
vim /etc/init.d/lvs-tun

#!/bin/sh
#
# Startup script handle the initialisation of LVS
# chkconfig: - 28 72
# description: Initialise the Linux Virtual Server for TUN
#
### BEGIN INIT INFO
# Provides: ipvsadm
# Required-Start: $local_fs $network $named
# Required-Stop: $local_fs $remote_fs $network
# Short-Description: Initialise the Linux Virtual Server
# Description: The Linux Virtual Server is a highly scalable and highly
#   available server built on a cluster of real servers, with the load
#   balancer running on Linux.
# description: start LVS of TUN-RIP
LOCK=/var/lock/ipvsadm.lock
VIP=10.10.36.11
. /etc/rc.d/init.d/functions
start() {
     PID=`ifconfig | grep tunl0 | wc -l`
     if [ $PID -ne 0 ];
     then
         echo "The LVS-TUN-RIP Server is already running !"
     else
         #Load the tun mod
         /sbin/modprobe tun
         /sbin/modprobe ipip
         #Set the tun Virtual IP Address
         /sbin/ifconfig tunl0 $VIP netmask 255.255.255.255 broadcast $VIP up
         /sbin/route add -host $VIP dev tunl0
         echo "1" >/proc/sys/net/ipv4/conf/tunl0/arp_ignore
         echo "2" >/proc/sys/net/ipv4/conf/tunl0/arp_announce
         echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
         echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
         echo "0" > /proc/sys/net/ipv4/conf/tunl0/rp_filter
         echo "0" > /proc/sys/net/ipv4/conf/all/rp_filter
         /bin/touch $LOCK
         echo "starting LVS-TUN-RIP server is ok !"
     fi
}

stop() {
         /sbin/ifconfig tunl0 down
         echo "0" >/proc/sys/net/ipv4/conf/tunl0/arp_ignore
         echo "0" >/proc/sys/net/ipv4/conf/tunl0/arp_announce
         echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
         echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
         #Remove the tun mod
         /sbin/modprobe -r tun
         /sbin/modprobe -r ipip
         rm -rf $LOCK
         echo "stopping LVS-TUN-RIP server is ok !"
}

status() {
     if [ -e $LOCK ];
     then
        echo "The LVS-TUN-RIP Server is already running !"
     else
        echo "The LVS-TUN-RIP Server is not running !"
     fi
}

case "$1" in
  start)
        start
        ;;
  stop)
        stop
        ;;
  restart)
        stop
        start
        ;;
  status)
        status
        ;;
  *)
        echo "Usage: $1 {start|stop|restart|status}"
        exit 1
esac
exit 0

# start lvs-tun
chmod 755 /etc/init.d/lvs-tun
service lvs-tun start
chkconfig lvs-tun on

# Nginx test
echo "rs1" > /usr/share/nginx/html/index.html
echo "rs2" > /usr/share/nginx/html/index.html

for i in {1..100}; do curl 10.10.36.11; sleep 0.5; done

# 关于 3 中模式的参数
[packet-forwarding-method]
       -g, --gatewaying  Use gatewaying (direct routing). This is the default.
       -i, --ipip  Use ipip encapsulation (tunneling).
       -m, --masquerading  Use masquerading (network access translation, or NAT).
       Note:  Regardless of the packet-forwarding mechanism specified, real servers for addresses for which there are interfaces on the local node will  be  use  the
       local  forwarding  method, then packets for the servers will be passed to upper layer on the local node. This cannot be specified by ipvsadm, rather it set by
       the kernel as real servers are added or modified.

# ipvsadm 命令行混配
/sbin/ifconfig tunl0 10.10.36.11 broadcast 10.10.36.11 netmask 255.255.255.255 up
/sbin/route add -host 10.10.36.11 dev tunl0
/sbin/ipvsadm -At 10.10.36.11:80 -s rr
/sbin/ipvsadm -at 10.10.36.11:80 -r 10.10.36.4:80 -g -w 1
/sbin/ipvsadm -at 10.10.36.11:80 -r 10.10.36.7:80 -i -w 1

# keepalived 混配
vrrp_sync_group GOP {
    group {
        VI_PRI_AUTH
    }
}

vrrp_instance VI_PRI_AUTH {
    state BACKUP
    interface em1
    virtual_router_id 11
    priority 100
    advert_int 1
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        10.10.36.11/23 dev em1
    }
}

virtual_server 10.10.36.11 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    protocol TCP

    real_server 10.10.36.4 80 {
        weight 100
        TCP_CHECK {
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 3
                connect_port 80
        }
    }
}

virtual_server 10.10.36.11 80 {
    delay_loop 6
    lb_algo rr
    lb_kind TUN
    protocol TCP

    real_server 10.10.36.7 80 {
        weight 100
        TCP_CHECK {
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 3
                connect_port 80
        }
    }
}

# 检查结果可用
[root@d126027 wangao]# for i in {1..100}; do curl 10.10.36.11; sleep 0.5; done
rs2
rs1
rs2
rs1
rs2

[root@d126009 keepalived]# ipvsadm -Ln --stats
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port               Conns   InPkts  OutPkts  InBytes OutBytes
  -> RemoteAddress:Port
TCP  10.10.36.11:80                    100      700        0    36700        0
  -> 10.10.36.4:80                      50      350        0    18350        0
  -> 10.10.36.7:80                      50      350        0    18350        0

# 修改 Keepalived 配置
vi /etc/sysconfig/keepalived

# Options for keepalived. See `keepalived --help'output and keepalived(8) and
# keepalived.conf(5) man pages for a list of all options. Here are the most
# common ones :
#
# --vrrp               -P    Only run with VRRP subsystem.
# --check              -C    Only run with Health-checker subsystem.
# --dont-release-vrrp  -V    Dont remove VRRP VIPs & VROUTEs on daemon stop.
# --dont-release-ipvs  -I    Dont remove IPVS topology on daemon stop.
# --dump-conf          -d    Dump the configuration data.
# --log-detail         -D    Detailed log messages.
# --log-facility       -S    0-7 Set local syslog facility (default=LOG_DAEMON)
#

# 把 KEEPALIVED_OPTIONS=”-D” 修改为 KEEPALIVED_OPTIONS=”-D -d -S 0”，其中 -S 指定 syslog 的 facility
KEEPALIVED_OPTIONS="-D -d -S 0"

# 修改 /etc/rsyslog.conf 末尾添加
vi /etc/rsyslog.conf 
local0.*                                                /var/log/keepalived.log

# 重启日志记录服务
systemctl restart rsyslog

# 重启 keepalived
systemctl restart keepalived

# 此时可以从 /var/log/keepalived.log 查看日志了
tailf /var/log/keepalived.log

[root@sg-gop-10-65-32-35 wangao]# arp -n
Address                  HWtype  HWaddress           Flags Mask            Iface
10.65.32.31              ether   48:8e:ef:7b:c6:0a   C                     bond0
10.65.32.83              ether   50:5d:ac:ed:89:dd   C                     bond0
10.65.32.254             ether   00:00:0c:9f:f0:ec   C                     bond0
10.65.32.252             ether   bc:16:65:68:07:81   C                     bond0
10.65.32.34              ether   50:1d:93:f5:eb:97   C                     bond0
10.65.32.8               ether   48:8e:ef:7c:0a:8d   C                     bond0
10.65.32.253             ether   18:e7:28:97:e5:01   C                     bond0
[root@sg-gop-10-65-32-35 wangao]# arp -d 10.65.32.31
[root@sg-gop-10-65-32-35 wangao]#
[root@sg-gop-10-65-32-35 wangao]#
[root@sg-gop-10-65-32-35 wangao]# telnet 10.65.32.31 12100
Trying 10.65.32.31...
Connected to 10.65.32.31.
Escape character is '^]'.

[root@sg-gop-10-65-32-35 wangao]# arp -n
Address                  HWtype  HWaddress           Flags Mask            Iface
10.65.32.31              ether   48:8e:ef:7b:c7:5a   C                     bond0
10.65.32.70              ether   00:2e:c7:3a:a5:b5   C                     bond0
10.65.32.83              ether   50:5d:ac:ed:89:dd   C                     bond0
10.65.32.254             ether   00:00:0c:9f:f0:ec   C                     bond0
10.65.32.252             ether   bc:16:65:68:07:81   C                     bond0
10.65.32.34              ether   50:1d:93:f5:eb:97   C                     bond0
10.65.32.8               ether   48:8e:ef:7c:0a:8d   C                     bond0
10.65.32.253             ether   18:e7:28:97:e5:01   C                     bond0