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              Linux基礎教程之Keepalived實現Nginx雙主高可用負載均衡集群

              實驗目的:使用keepalived實現Nginx的雙主高可用負載均衡集群。

              實驗環境:兩臺Nginx proxy(雙主Nginx,各需要兩塊網卡,eth0連接內網,eth1連接外網)、兩臺web server(請求的負載均衡)、一臺client用于驗證結果。

              Linux基礎教程之Keepalived實現Nginx雙主高可用負載均衡集群

              注意:為了不影響實驗結果,在實驗開始前先關閉iptables和selinux

              操作步驟:

              一、配置IP

              1.配置A主機的IP

              # ip addr add dev eth0 192.168.10.2/24

              2.配置B主機的IP

              # ip addr add dev eth0 192.168.10.23/24

              3.配置C主機的IP

              # ip addr add dev eth0 192.168.10.3/24

              4.配置D主機的IP

              # ip addr add dev eth0 192.168.10.33/24

              二、配置web服務(C和D主機都做同樣配置,只需修改默認主頁中的IP地址為本機的IP即可,以示區別)

              1.安裝apache

              # yum -y install apache

              2.創建默認主頁

              # vim /var/www/html/index.html

              <h1>192.168.10.3</h1>

              3.啟動apache

              # service httpd start

              三、配置sorry_server(此服務配置于Nginx proxy主機上,兩臺Nginx proxy都做同樣配置,只需修改默認主頁中的IP地址為本機的IP即可,以示區別)

              1.安裝apache

              # yum -y install apache

              2.創建默認主頁

              # vim /var/www/html/index.html

              <h1>sorry_server:192.168.10.2</h1>

              3.修改監聽端口為8080,以免與nginx所監聽的端口沖突

              # vim /etc/httpd/conf/httpd.conf

              Listen 8080

              4.啟動apache服務

              四、配置代理(兩臺Nginx proxy都做同樣配置)

              1.安裝nginx

              # yum -y install nginx

              2.定義upstream集群組,在http{}段中定義;

              # vim /etc/nginx/nginx.conf

              http {

              upstream websrvs {

              server 192.168.10.3:80;

              server 192.168.10.33:80;

              server 127.0.0.1:8080 backup;

              }

              }

              3.調用定義的集群組,在server{}段的location{}段中調用;

              # vim /etc/nginx/conf.d/default.conf

              server {

              location / {

              proxy_pass?http://wersrvs;

              index index.html;

              }

              }

              4.啟動服務

              # service nginx start

              五、配置keepalived

              A主機上操作

              1.安裝keepalived

              # yum -y install keepalived

              2.編輯A主機的配置文件/etc/keepalived/keepalived.conf,作如下配置:

              ! 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?CentOS6

              vrrp_mcast_group4 224.0.100.39

              }

              vrrp_script chk_down {

              script “[[ -f /etc/keepalived/down ]] && exit 1 || exit 0”

              interval 1

              weight -5

              }

              vrrp_script chk_nginx {

              script “killall -0 nginx && exit 0 || exit 1”

              interval 1

              weight -5

              fall 2

              rise 1

              }

              vrrp_instance ngx {

              state MASTER

              interface eth1

              virtual_router_id 14

              priority 100

              advert_int 1

              authentication {

              auth_type PASS

              auth_pass MDQ41fTp

              }

              virtual_ipaddress {

              192.168.20.100/24 dev eth1

              }

              track_script {

              chk_down

              chk_nginx

              }

              }

              vrrp_instance ngx2 {

              state BACKUP

              interface eth1

              virtual_router_id 15

              priority 98

              advert_int 1

              authentication {

              auth_type PASS

              auth_pass XYZ41fTp

              }

              virtual_ipaddress {

              192.168.20.200/24 dev eth1

              }

              track_script {

              chk_down

              chk_nginx

              }

              }

              B主機也作同樣配置,稍作修改即可,需要修改的地方如下:

              vrrp_instance ngx {

              state BACKUP

              priority 98

              }

              vrrp_instance ngx2 {

              state MASTER

              priority 100

              }

              六、模擬故障,驗證結果

              1.啟動兩臺Nginx proxy的keepalived服務

              # service keepalived start

              2.訪問192.168.20.100,結果應是后端的web server輪詢響應請求

              Linux基礎教程之Keepalived實現Nginx雙主高可用負載均衡集群

              3.訪問192.168.20.200,結果應是后端的web server輪詢響應請求

              Linux基礎教程之Keepalived實現Nginx雙主高可用負載均衡集群

              4.將后端的web server關閉一臺,訪問192.168.20.100或192.168.20.200,響應請求的將只是另一臺正常運行web server的主機

              Linux基礎教程之Keepalived實現Nginx雙主高可用負載均衡集群

              5.將后端的web server都關閉,此時訪問192.168.20.100或192.168.20.200,響應請求的將只是Nginx proxy中定義的主server中的sorry_server

              Linux基礎教程之Keepalived實現Nginx雙主高可用負載均衡集群

              6.關閉一臺Nginx proxy 的nginx服務,備server將把IP地址添加到本機,繼續提供服務,此時訪問192.168.20.100或192.168.20.200并不會有任何察覺

              Linux基礎教程之Keepalived實現Nginx雙主高可用負載均衡集群

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