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[经验分享] 双主模型高可用负载均衡集群的实现（keepalived+lvs

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prollerweg

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发表于 2019-1-1 06:04:17 | 显示全部楼层 |阅读模式
实现keepalived双主模型lvs高可用集群

　　一、拓扑图

　　二、环境准备
　　两台负载均衡调度器，两台web服务器。
　　调度器A环境:
　　VS:一张网卡
　　DIP:192.168.0.7/24
　　VIP（主）：192.168.0.200
　　VIP(备)：192.168.0.201
　　软件包：yum install -y keepalived ipvsadm nginx(作用：sorry-server服务)
　　

　　调度器B环境：
　　VS:一张网卡
　　DIP:192.168.0.8/24
　　VIP（主）：192.168.0.201
　　VIP(备)：192.168.0.200
　　软件包：yum install -y keepalived ipvsadm nginx(作用：sorry-server服务)
　　

　　web服务器A环境：
　　RS1:192.168.0.3
　　lo:0:192.168.0.200
　　lo:1:192.168.0.201
　　软件包：yum install -y httpd
　　

　　web服务器B环境：
　　RS1:192.168.0.4
　　lo:0:192.168.0.200
　　lo:1:192.168.0.201
　　软件包：yum install -y httpd
　　

　　三、配置
　　调度器A配置
　　主要操作：ip配置，时间同步、hosts文件更改，修改主机名（确保主从节点能够通信）、keepalived.conf配置文件更改，通知脚本配置(两个脚本)，ipvsadm规则查看
　　ip配置
[root@node1keepalived]# ip a
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens33:  mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:0c:d2:06 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.7/24 brd 192.168.0.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet 192.168.0.200/24 scope global secondary ens33:1
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe0c:d206/64 scope link
       valid_lft forever preferred_lft forever　　时间同步
ntpdate ntp-server-ip #时间服务器的ip　　hosts文件

[root@node1 keepalived]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4 node1
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6 node1
192.168.0.8 node2
192.168.0.7 node1　　主机名修改
hostnamectl set-hostname node1　　keepalived.conf配置文件更改
[root@localhost keepalived]# cat keepalived.conf
! Configuration File for keepalived
global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from keepalived@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 10
   router_id node1
vrrp_mcast_group4 224.0.0.223
}
vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 51
    priority 110
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass JzvnmfkY
    }
    virtual_ipaddress {
        192.168.0.200/24 dev ens33 label ens33:1
    }
notify_master "/etc/keepalived/notify1.sh master"
notify_backup "/etc/keepalived/notify1.sh backup"
notify_fault "/etc/keepalived/notify1.sh fault"
}
virtual_server 192.168.0.200 80 {
    delay_loop 3
    lb_algo wrr
    lb_kind DR
    protocol TCP
    sorry_server 127.0.0.1 80
    real_server 192.168.0.3 80 {
        weight 2
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
    real_server 192.168.0.4 80 {
        weight 1
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
}
}
vrrp_instance VI_2 {
    state BACKUP
    interface ens33
    virtual_router_id 52
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass JzvnmfkY
    }
    virtual_ipaddress {
        192.168.0.201/24 dev ens33 label ens33:2
    }
notify_master "/etc/keepalived/notify2.sh master"
notify_backup "/etc/keepalived/notify2.sh backup"
notify_fault "/etc/keepalived/notify2.sh fault"
}
virtual_server 192.168.0.201 80 {
    delay_loop 3
    lb_algo wrr
    lb_kind DR
    protocol TCP
    sorry_server 127.0.0.1 80
    real_server 192.168.0.3 80 {
        weight 1
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
    real_server 192.168.0.4 80 {
        weight 2
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
}
}　　通知脚本配置
　　脚本1
[root@node1 keepalived]# cat notify1.sh
#!/bin/bash
#description: An example of notify script
#
vip=192.168.0.200
contact='root@localhost'
notify(){
local mailsubject="$(hostname) to be $1:$vip floating"
local mailbody="$(date +'%F %T'):vrrp1 transition,$(hostname) changed to be $1"
echo "$mailbody" | mail -s "$mailsubject" $contact
}
case $1 in
master)
notify master
;;
backup)
notify backup
;;
fault)
notify fault
;;
*)
echo "Usage:$(basename $0) {master|backup|fault}"
exit 1
;;
esac　　脚本2
[root@node1 keepalived]# cat notify2.sh
#!/bin/bash
#description: An example of notify script
#
vip=192.168.0.201
contact='root@localhost'
notify(){
local mailsubject="$(hostname) to be $1:$vip floating"
local mailbody="$(date +'%F %T'):vrrp2 transition,$(hostname) changed to be $1"
echo "$mailbody" | mail -s "$mailsubject" $contact
}
case $1 in
master)
notify master
;;
backup)
notify backup
;;
fault)
notify fault
;;
*)
echo "Usage:$(basename $0) {master|backup|fault}"
exit 1
;;
esac　　ipvsadm规则查看
[root@node1 keepalived]# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.0.200:80 wrr
  -> 192.168.0.3:80               Route   2      0          0         
  -> 192.168.0.4:80               Route   1      0          0         
TCP  192.168.0.201:80 wrr
  -> 192.168.0.3:80               Route   1      0          0         
  -> 192.168.0.4:80               Route   2      0          0　　调度器B配置
　　主要操作：ip配置，时间同步、hosts文件更改，修改主机名（确保主从节点能够通信）、keepalived.conf配置文件更改，通知脚本配置(两个脚本)，ipvsadm规则查看
　　ip配置
[root@node2 keepalived]# ip a
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens33:  mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:3f:e3:9e brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.8/24 brd 192.168.0.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet 192.168.0.201/24 scope global secondary ens33:2
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe3f:e39e/64 scope link
       valid_lft forever preferred_lft forever　　时间同步
ntpdate ntp-server-ip　　

　　hosts文件更改
[root@node2 keepalived]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4 node2
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6 node2
192.168.0.7 node1
192.168.0.8 node2　　主机名修改
hostnamectl set-hostname node2　　keepalived.conf配置文件更改
[root@localhost keepalived]# cat keepalived.conf
! Configuration File for keepalived
global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from keepalived@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 10
   router_id node2
vrrp_mcast_group4 224.0.0.223
}
vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass JzvnmfkY
    }
    virtual_ipaddress {
        192.168.0.200/24 dev ens33 label ens33:1
    }
        notify_master "/etc/keepalived/notify1.sh master"
        notify_backup "/etc/keepalived/notify1.sh backup"
        notify_fault "/etc/keepalived/notify1.sh fault"
}
virtual_server 192.168.0.200 80 {
    delay_loop 3
    lb_algo wrr
    lb_kind DR
    protocol TCP
sorry_server 127.0.0.1 80
    real_server 192.168.0.3 80 {
        weight 2
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
    real_server 192.168.0.4 80 {
        weight 1
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
}
}
vrrp_instance VI_2 {
    state MASTER
    interface ens33
    virtual_router_id 52
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass JzvnmfkY
    }
    virtual_ipaddress {
        192.168.0.201/24 dev ens33 label ens33:2
    }
        notify_master "/etc/keepalived/notify2.sh master"
        notify_backup "/etc/keepalived/notify2.sh backup"
        notify_fault "/etc/keepalived/notify2.sh fault"
}
virtual_server 192.168.0.201 80 {
    delay_loop 3
    lb_algo wrr
    lb_kind DR
    protocol TCP
sorry_server 127.0.0.1 80
    real_server 192.168.0.3 80 {
        weight 1
        HTTP_GET {
            url {
              path /
              status_code 200
            }
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
    real_server 192.168.0.4 80 {
        weight 2
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
}
}　　通知脚本配置(同调度器A的脚本一致)
　　脚本1
[root@node2 keepalived]# cat notify1.sh
#!/bin/bash
#description: An example of notify script
#
vip=192.168.0.200
contact='root@localhost'
notify(){
local mailsubject="$(hostname) to be $1:$vip floating"
local mailbody="$(date +'%F %T'):vrrp1 transition,$(hostname) changed to be $1"
echo "$mailbody" | mail -s "$mailsubject" $contact
}
case $1 in
master)
notify master
;;
backup)
notify backup
;;
fault)
notify fault
;;
*)
echo "Usage:$(basename $0) {master|backup|fault}"
exit 1
;;
esac　　脚本2
[root@node2 keepalived]# cat notify2.sh
#!/bin/bash
#description: An example of notify script
#
vip=192.168.0.201
contact='root@localhost'
notify(){
local mailsubject="$(hostname) to be $1:$vip floating"
local mailbody="$(date +'%F %T'):vrrp2 transition,$(hostname) changed to be $1"
echo "$mailbody" | mail -s "$mailsubject" $contact
}
case $1 in
master)
notify master
;;
backup)
notify backup
;;
fault)
notify fault
;;
*)
echo "Usage:$(basename $0) {master|backup|fault}"
exit 1
;;
esac　　web服务器A配置
　　ip配置
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet 192.168.0.201/32 brd 192.168.0.201 scope global lo:1
       valid_lft forever preferred_lft forever
    inet 192.168.0.200/32 brd 192.168.0.200 scope global lo:0
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens33:  mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:ab:50:14 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.4/24 brd 192.168.0.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:feab:5014/64 scope link
       valid_lft forever preferred_lft forever　　lvs-dr-预配置脚本
　　脚本1
[root@localhost ~]# cat vip200-setrs.sh
#!/bin/bash
#
vip=192.168.0.200
mask='255.255.255.255'
case $1 in
start)
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
ifconfig lo:0 $vip netmask $mask broadcast $vip up
route add -host $vip dev lo:0
;;
stop)
ifconfig lo:0 down
echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 0 > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce
echo 0 > /proc/sys/net/ipv4/conf/lo/arp_announce
;;
*)
echo "Usage $(basename $0) start|stop"
exit 1
;;
esac　　

　　脚本2
[root@localhost ~]# cat vip201-setrs.sh
#!/bin/bash
#
vip=192.168.0.201
mask='255.255.255.255'
case $1 in
start)
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
ifconfig lo:1 $vip netmask $mask broadcast $vip up
route add -host $vip dev lo:1
;;
stop)
ifconfig lo:1 down
echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 0 > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce
echo 0 > /proc/sys/net/ipv4/conf/lo/arp_announce
;;
*)
echo "Usage $(basename $0) start|stop"
exit 1
;;
esac　　web服务器B配置
　　ip配置
[root@localhost ~]# ip a
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet 192.168.0.201/32 brd 192.168.0.201 scope global lo:1
       valid_lft forever preferred_lft forever
    inet 192.168.0.200/32 brd 192.168.0.200 scope global lo:0
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens33:  mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:ab:50:14 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.4/24 brd 192.168.0.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:feab:5014/64 scope link
       valid_lft forever preferred_lft forever　　lvs-dr-预设脚本
　　脚本内容同web服务A相同，拷贝过去即可
　　vip200-setrs.sh  vip201-setrs.sh
　　客户端测试
　　ip配置
　　[root@localhost ~]# ip a
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens33:  mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:d0:37:77 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.14/24 brd 192.168.0.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fed0:3777/64 scope link
       valid_lft forever preferred_lft forever　　 curl测试
[root@localhost ~]# for i in {1..10};do curl http://192.168.0.200;done
backend server1
backend server1
backend server2
backend server1
backend server1
backend server2
backend server1
backend server1
backend server2
backend server1
[root@localhost ~]# for i in {1..10};do curl http://192.168.0.201;done
backend server1
backend server2
backend server2
backend server1
backend server2
backend server2
backend server1
backend server2
backend server2
backend server1　　四、健康状态查看以及故障排查参考方式
　　 方式1：查看keepalived的切换过程
　　systemctl status keepalived
　　 方式2：mail命令查看邮件
　　 方式3：查看web服务器日志
　　tail /var/log/httpd/access_log
　　tail /var/log/httpd/error_log
　　五、模拟故障
　　 1.模拟调度器B故障
　　调度器B上操作
　　停止keepalived服务
systemctl stop keepalived
[root@node2 keepalived]# systemctl status keepalived #分析以下信息，VIP2已移除
Jul 02 10:18:53 node2 systemd[1]: Stopping LVS and VRRP High Availability Monitor...
Jul 02 10:18:53 node2 Keepalived_vrrp[50773]: VRRP_Instance(VI_2) sending 0 priority
Jul 02 10:18:53 node2 Keepalived_vrrp[50773]: VRRP_Instance(VI_2) removing protocol VIPs.
Jul 02 10:18:53 node2 systemd[1]: Stopped LVS and VRRP High Availability Monitor.　　查看ip
[root@node2 keepalived]# ip a           #VIP2移除
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens33:  mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:3f:e3:9e brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.8/24 brd 192.168.0.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe3f:e39e/64 scope link
       valid_lft forever preferred_lft forever　　调度器A操作
[root@node1 keepalived]# systemctl status keepalived #分析以下信息，可知VIP漂移到调度A
● keepalived.service - LVS and VRRP High Availability Monitor
   Loaded: loaded (/usr/lib/systemd/system/keepalived.service; enabled; vendor preset: disabled)
   Active: active (running) since Sun 2017-07-02 10:07:36 CST; 17min ago
  Process: 20019 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 20020 (keepalived)
   CGroup: /system.slice/keepalived.service
           ├─20020 /usr/sbin/keepalived -D
           ├─20021 /usr/sbin/keepalived -D
           └─20022 /usr/sbin/keepalived -D
Jul 02 10:07:37 node1 Keepalived_vrrp[20022]: Opening script file /etc/keepalived/notify1.sh
Jul 02 10:07:37 node1 Keepalived_healthcheckers[20021]: Netlink reflector reports IP 192.168.0.200 added
Jul 02 10:07:42 node1 Keepalived_vrrp[20022]: VRRP_Instance(VI_1) Sending gratuitous ARPs on ens33 for 192.168.0.200
Jul 02 10:18:54 node1 Keepalived_vrrp[20022]: VRRP_Instance(VI_2) Transition to MASTER STATE
Jul 02 10:18:55 node1 Keepalived_vrrp[20022]: VRRP_Instance(VI_2) Entering MASTER STATE
Jul 02 10:18:55 node1 Keepalived_vrrp[20022]: VRRP_Instance(VI_2) setting protocol VIPs.
Jul 02 10:18:55 node1 Keepalived_vrrp[20022]: VRRP_Instance(VI_2) Sending gratuitous ARPs on ens33 for 192.168.0.201
Jul 02 10:18:55 node1 Keepalived_vrrp[20022]: Opening script file /etc/keepalived/notify2.sh
Jul 02 10:18:55 node1 Keepalived_healthcheckers[20021]: Netlink reflector reports IP 192.168.0.201 added
Jul 02 10:19:00 node1 Keepalived_vrrp[20022]: VRRP_Instance(VI_2) Sending gratuitous ARPs on ens33 for 192.168.0.201　　查看邮件
[root@node1 keepalived]# mail        #node1成为VIP192.168.0.201的主节点
Heirloom Mail version 12.5 7/5/10.  Type ? for help.
"/var/spool/mail/root": 1 message
>   1 root                  Sun Jul  2 10:18  19/702   "node1 to be master:192.168.0.201 floating"
& 1  
Message  1:
From root@node1.localdomain  Sun Jul  2 10:18:55 2017
Return-Path:
X-Original-To: root@localhost
Delivered-To: root@localhost.localdomain
Date: Sun, 02 Jul 2017 10:18:55 +0800
To: root@localhost.localdomain
Subject: node1 to be master:192.168.0.201 floating
User-Agent: Heirloom mailx 12.5 7/5/10
Content-Type: text/plain; charset=us-ascii
From: root@node1.localdomain (root)
Status: RO
2017-07-02 10:18:55:vrrp2 transition,node1 changed to be master　　2.模拟web服务器A故障(RS1)
　　webA上操作
[root@localhost ~]# systemctl stop httpd　　调度器A上操作
　　 查看邮件
[root@node1 keepalived]# mail #分析以下信息，可知RS1宕机
Heirloom Mail version 12.5 7/5/10.  Type ? for help.
"/var/spool/mail/root": 4 messages 2 new
    1 root                  Sun Jul  2 10:18  19/702   "node1 to be master:192.168.0.201 floating"
    2 root                  Sun Jul  2 10:28  19/702   "node1 to be backup:192.168.0.201 floating"
>N  3 keepalived@localhost  Sun Jul  2 10:28  17/642   "[node1] Realserver [192.168.0.3]:80 - DOWN"
N  4 keepalived@localhost  Sun Jul  2 10:28  17/642   "[node1] Realserver [192.168.0.3]:80 - DOWN"　　客户端请求查看
[root@localhost ~]# curl http://192.168.0.200 #只能访问到RS2
backend server2　　    调度器B上操作
[root@node2 keepalived]# mail #分析以下信息，可知RS1宕机
Heirloom Mail version 12.5 7/5/10.  Type ? for help.
"/var/spool/mail/root": 4 messages 2 new
    1 root                  Sun Jul  2 10:28  19/702   "node2 to be backup:192.168.0.200 floating"
    2 root                  Sun Jul  2 10:28  19/702   "node2 to be master:192.168.0.201 floating"
>N  3 keepalived@localhost  Sun Jul  2 10:28  17/642   "[node2] Realserver [192.168.0.3]:80 - DOWN"
N  4 keepalived@localhost  Sun Jul  2 10:28  17/642   "[node2] Realserver [192.168.0.3]:80 - DOWN"　　3.模拟web服务双机故障
　　RS1和RS2停止web服务

　　调度器A上操作
　　查看邮件                #分析以下信息，可知双机宕机
    [root@node1 keepalived]# mail
Heirloom Mail version 12.5 7/5/10.  Type ? for help.
"/var/spool/mail/root": 6 messages 2 new
    1 root                  Sun Jul  2 10:18  19/702   "node1 to be master:192.168.0.201 floating"
    2 root                  Sun Jul  2 10:28  19/702   "node1 to be backup:192.168.0.201 floating"
    3 keepalived@localhost  Sun Jul  2 10:28  18/653   "[node1] Realserver [192.168.0.3]:80 - DOWN"
    4 keepalived@localhost  Sun Jul  2 10:28  18/653   "[node1] Realserver [192.168.0.3]:80 - DOWN"
>N  5 keepalived@localhost  Sun Jul  2 10:36  17/642   "[node1] Realserver [192.168.0.4]:80 - DOWN"
N  6 keepalived@localhost  Sun Jul  2 10:36  17/642   "[node1] Realserver [192.168.0.4]:80 - DOWN"　　查看keepalived状态
[root@node1 keepalived]# systemctl status keepalived    #分析以下信息，双机宕机，启动sorry服务器  
● keepalived.service - LVS and VRRP High Availability Monitor
   Loaded: loaded (/usr/lib/systemd/system/keepalived.service; enabled; vendor preset: disabled)
   Active: active (running) since Sun 2017-07-02 10:07:36 CST; 30min ago
  Process: 20019 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 20020 (keepalived)
   CGroup: /system.slice/keepalived.service
           ├─20020 /usr/sbin/keepalived -D
           ├─20021 /usr/sbin/keepalived -D
           └─20022 /usr/sbin/keepalived -D
Jul 02 10:36:31 node1 Keepalived_healthcheckers[20021]: Removing alive servers from the pool for VS [192.168.0.200]:80
Jul 02 10:36:31 node1 Keepalived_healthcheckers[20021]: Remote SMTP server [127.0.0.1]:25 connected.
Jul 02 10:36:31 node1 Keepalived_healthcheckers[20021]: SMTP alert successfully sent.
Jul 02 10:36:32 node1 Keepalived_healthcheckers[20021]: Error connecting server [192.168.0.4]:80.
Jul 02 10:36:32 node1 Keepalived_healthcheckers[20021]: Removing service [192.168.0.4]:80 from VS [192.168.0.201]:80
Jul 02 10:36:32 node1 Keepalived_healthcheckers[20021]: Lost quorum 1-0=1 > 0 for VS [192.168.0.201]:80
Jul 02 10:36:32 node1 Keepalived_healthcheckers[20021]: Adding sorry server [127.0.0.1]:80 to VS [192.168.0.201]:80
Jul 02 10:36:32 node1 Keepalived_healthcheckers[20021]: Removing alive servers from the pool for VS [192.168.0.201]:80
Jul 02 10:36:32 node1 Keepalived_healthcheckers[20021]: Remote SMTP server [127.0.0.1]:25 connected.
Jul 02 10:36:32 node1 Keepalived_healthcheckers[20021]: SMTP alert successfully sent.　　客户端请求
[root@localhost ~]# curl http://192.168.0.201        #请求至sorry服务器的web页面
sorry server
[root@localhost ~]# curl http://192.168.0.200
sorry server






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