keepalived lvs 實現lvs高可用

時間 2019-12-28

標籤 keepalived lvs 實現可用欄目負載均衡简体版

原文原文鏈接

keepalived 簡介html

keepalived是借用VRRP協議來實現高可用性的，VRRP協議是解決單點故障，使路由器和層三交換機實現冗餘功能。node

keepalived啓動後會有三個進程web

父進程：內存管理，子進程管理等等vim

子進程：VRRP子進程centos

子進程：healthchecker子進程api

從圖上能夠看出，兩個子進程都被系統WatchDog看管，兩個子進程各自操做本身的事，healthchecker子進程負責檢查各自服務器的健康程度，例如HTTP，LVS等等，若是healthchecker子進程檢查到MASTER上服務不可用了，就會通知本機上的VRRP子進程，讓他刪除通告，而且去掉虛擬IP，轉換爲BACKUP狀態服務器

環境準備ide

1 操做系統oop

centos6.4 x86_64 測試

2 實驗拓撲

3 服務器時間同步

[root@node1 ~]#ntpdate ntp.api.bz

[root@node2 ~]#ntpdate ntp.api.bz

[root@web1 ~]#ntpdate ntp.api.bz

[root@web2 ~]#ntpdate ntp.api.bz

4 安裝keepalived ipvsadm

[root@node1 ~]# yum install keepalived ipvsadm

5 修改配置文件

! 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 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.200.10
    }
}
virtual_server 192.168.200.10 80 {
    delay_loop 6
    lb_algo wrr
    lb_kind DR
    net_mask 255.255.255.0
    protocol TCP
    real_server 192.168.200.138 80 {
            weight 1
            HTTP_GET {
               url {
                    path /
                    status_code 200
                   }
               connect_timeout 3
               nb_get_retry 3
               delay_before_retry 3
            }
}

    real_server 192.168.200.139 80 {
            weight 1
            HTTP_GET {
               url {
                    path /
                    status_code 200
                   }
               connect_timeout 3
               nb_get_retry 3
               delay_before_retry 3
            }
}
}

6 複製配置文件到從服務器

[root@node1 ~]# scp /etc/keepalived/keepalived.conf 192.168.200.18:/etc/keepalived/keepalived.conf

7 從服務器安裝keepalived ipvsadm

[root@node2 ~]# yum install keepalived ipvsadm

8 修改配置文件

[root@node2 ~]# vim /etc/keepalived/keepalived.conf 
state BACKUP
priority 99

9 開啓服務

[root@node1 ~]# service keepalived start
[root@node1 ~]# chkconfig --add keepalived
[root@node1 ~]# chkconfig keepalived on

[root@node2 ~]# service keepalived start
[root@node2 ~]# chkconfig --add keepalived
[root@node2 ~]# chkconfig keepalived on

10 安裝 http

[root@web1 ~]# yum install httpd

[root@web2 ~]# yum install httpd

11 創建測試網頁

[root@web1 html]# cd /var/www/html/
[root@web1 html]# vim index.html
this is web1

[root@web2 ~]# cd /var/www/html/
[root@web2 html]# vim index.html
this is web2

12 啓動服務

[root@web1 html]# service httpd start
[root@web1 html]# chkconfig --add httpd
[root@web1 html]# chkconfig httpd on

[root@web2 html]# service httpd start
[root@web2 html]# chkconfig --add httpd
[root@web2 html]# chkconfig httpd on

13 修改內存參數配置vip

[root@web1 ~]# echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
[root@web1 ~]# echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
[root@web1 ~]# echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
[root@web1 ~]# echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
[root@web1 ~]# ifconfig lo:0 192.168.200.10 broadcast 192.168.200.10 netmask 255.255.255.255 up
[root@web1 ~]# route add -host 192.168.200.10 dev lo:0

[root@web2 ~]# echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
[root@web2 ~]# echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
[root@web2 ~]# echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
[root@web2 ~]# echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
[root@web2 ~]# ifconfig lo:0 192.168.200.10 broadcast 192.168.200.10 netmask 255.255.255.255 up
[root@web2 ~]# route add -host 192.168.200.10 dev lo:0

14 查看相關vip ipvs規則

[root@node1 ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:3e:54:30 brd ff:ff:ff:ff:ff:ff
    inet 192.168.200.17/24 brd 192.168.200.255 scope global eth0
    inet 192.168.200.10/32 scope global eth0
    inet6 fe80::20c:29ff:fe3e:5430/64 scope link 
       valid_lft forever preferred_lft forever

[root@node1 ~]# ipvsadm -L -n
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.200.10:80 wrr
  -> 192.168.200.138:80           Route   1      0          0         
  -> 192.168.200.139:80           Route   1      0          0

15 測試

web1

web2

中止master的keepalived服務，vip ipvs規則會切換到backup服務器上

[root@node1 ~]# service keepalived stop

[root@node2 ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:af:d6:a0 brd ff:ff:ff:ff:ff:ff
    inet 192.168.200.18/24 brd 192.168.200.255 scope global eth0
    inet 192.168.200.10/32 scope global eth0
    inet6 fe80::20c:29ff:feaf:d6a0/64 scope link 
       valid_lft forever preferred_lft forever

[root@node2 ~]# ipvsadm -L -n
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.200.10:80 wrr
  -> 192.168.200.138:80           Route   1      0          0         
  -> 192.168.200.139:80           Route   1      0          0

中止web1服務 ipvs規則會清除web1服務器

[root@web1 ~]# service httpd stop

[root@node1 ~]# ipvsadm -L -n
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.200.10:80 wrr
  -> 192.168.200.139:80           Route   1      0

開啓web1服務 ipvs自動會添加web1服務器

[root@node1 ~]# ipvsadm -L -n IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port Forward Weight ActiveConn InActConn TCP 192.168.200.10:80 wrr -> 192.168.200.138:80 Route 1 0 0 -> 192.168.200.139:80 Route 1 0

相關標籤/搜索

keepalived+lvs

lvs+keepalived

lvs

lvs+keepalived+ipvsadm

nginx+keepalived+lvs

keepalived+lvs+mysql

mysql+lvs+keepalived

lvs+keepalived+rsyslog

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