系統(tǒng)運(yùn)維

一、keepalive實(shí)現(xiàn)雙主:
1.1實(shí)驗準(zhǔn)備
2臺主機(jī)地址分別為:172.20.10.9,172.20.10.10,
vip1為172.20.10.10，vip2為172.20.10.11
1.2通知腳本:

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[root@node5 /]# vim /etc/keepalived/notify.sh 
#!/bin/bash
contact=\'root@localhost\'
notify() {
    local mailsubject=$(hostname) to be $1, vip floating
    local mailbody=$(date +\'%F %T\'): vrrp 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

1.3配置node5為vip1地址的主節(jié)點(diǎn)，vip2地址的備節(jié)點(diǎn)

[root@node5 ~]# vim /etc/keepalived/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 30
   router_id node5
   vrrp_mcast_group4 224.0.100.19
}

vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        172.20.10.10/28 dev ens33 label ens33:0
    }
   notify_master /etc/keepalived/notify.sh master
   notify_backup /etc/keepalived/notify.sh backup
   notify_fault /etc/keepalived/notify.sh fault
}
vrrp_instance VI_2 {
    state BACKUP
    interface ens33
    virtual_router_id 52
    priority 98
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        172.20.10.11/28 dev ens33 label ens33:1
    }
   notify_master /etc/keepalived/notify.sh master
   notify_backup /etc/keepalived/notify.sh backup
   notify_fault /etc/keepalived/notify.sh fault
}

1.4配置node6為vip1地址的備節(jié)點(diǎn)，vip2地址的主節(jié)點(diǎn)

[root@node6 ~]# vim /etc/keepalived/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 30
   router_id node5
   vrrp_mcast_group4 224.0.100.19
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 51
    priority 98
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        172.20.10.10/28 dev ens33 label ens33:0
    }
   notify_master /etc/keepalived/notify.sh master
   notify_backup /etc/keepalived/notify.sh backup
   notify_fault /etc/keepalived/notify.sh fault
}
vrrp_instance VI_2 {
    state MASTER
    interface ens33
    virtual_router_id 52
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        172.20.10.11/28 dev ens33 label ens33:1
    }
   notify_master /etc/keepalived/notify.sh master
   notify_backup /etc/keepalived/notify.sh backup
   notify_fault /etc/keepalived/notify.sh fault
}

1.5驗證:
(1)先開啟node6節(jié)點(diǎn)的keepalived服務(wù),查看IP地址，狀態(tài):
2個VIP地址都在node6節(jié)點(diǎn)上：

(2)再開啟node5節(jié)點(diǎn)keepalived服務(wù),查看IP地址和狀態(tài):
VIP1地址已經(jīng)飄到了node5節(jié)點(diǎn)上了


二，Nginx+Keepalived實(shí)現(xiàn)站點(diǎn)高可用
2.1實(shí)驗準(zhǔn)備:
2臺主機(jī):node5地址為172.20.10.9，node6的節(jié)點(diǎn)為172.20.10.8
vip地址為172.20.10.10
2.2nginx配置
(1)node5節(jié)點(diǎn)

[root@node5 ~]# yum install nginx -y
[root@node5 /]# vim /usr/share/nginx/html/index.html 
node5 web page
[root@node5 ~]# systemctl  start nginx

(2)node6節(jié)點(diǎn)

[root@node6 /]# yum install -y  nginx
[root@node6 /]# vim /usr/share/nginx/html/index.html 
node6 web page
[root@node6 ~]# systemctl  start nginx

2.3配置node5為vip的主節(jié)點(diǎn)，配置檢查nginx的監(jiān)控腳本:

[root@node5 /]# vim /etc/keepalived/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 30
   router_id node5
   vrrp_mcast_group4 224.0.100.19
}
vrrp_script chk_nginx {
    script /usr/bin/killall -0 nginx &&  exit 0 || exit 1 
    interval 1
    weight -5
    fall 2
    rise 1
}
vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        172.20.10.10/28 dev ens33 label ens33:0
    }
    track_script {
        chk_nginx
    }
    track_interface {
        ens33
    }
   notify_master /etc/keepalived/notify.sh master
   notify_backup /etc/keepalived/notify.sh backup
   notify_fault /etc/keepalived/notify.sh fault
}
[root@node5 keepalived]# systemctl  start   keepalived

2.4配置node6為vip的備節(jié)點(diǎn)，配置檢查nginx的監(jiān)控腳本:

[root@node6 /]# vim /etc/keepalived/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 30
   router_id node5
   vrrp_mcast_group4 224.0.100.19
}
vrrp_script chk_nginx {
    script /usr/bin/killall -0 nginx &&  exit 0 || exit 1 
    interval 1
    weight -5
    fall 2
    rise 1
}
vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 51
    priority 98
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        172.20.10.10/28 dev ens33 label ens33:0
    }
    track_script {
        chk_nginx
    }
    track_interface {
        ens33
    }
   notify_master /etc/keepalived/notify.sh master
   notify_backup /etc/keepalived/notify.sh backup
   notify_fault /etc/keepalived/notify.sh fault
}
[root@node6 html]# systemctl  start   keepalived

3.驗證：
3.1當(dāng)服務(wù)都正常時，vip地址在node5節(jié)點(diǎn)上,測試訪問172.20.10.10的情況:


3.2當(dāng)down掉node5節(jié)點(diǎn)上nginx服務(wù)時，觀察vip地址和其訪問情況:
vip地址飄到node6節(jié)點(diǎn)上，curl172.20.10.10，則訪問的時node6節(jié)點(diǎn)

3.3當(dāng)恢復(fù)node5節(jié)點(diǎn)上nginx服務(wù)時，vip地址飄到node5節(jié)點(diǎn)上，訪問172.20.10.10則是node5上nginx

當(dāng)前名稱：keepalived雙主以及nginx+keepalived實(shí)現(xiàn)高可用
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