Keepalived 之 雙主模式+DNS輪詢機制 實現高負載
阿新 • • 發佈:2018-08-11
location 記錄 ipa res 均衡 sta text 不一致 for 一、Keepalived雙主模式+DNS輪詢機制作用
作用:在單主模式下,備機通常會以等待狀態放著,不接受任何數據,導致所有數據請求只往主機-負載均衡發送,做成資源浪費;而雙主模式,即創造兩個VIP,兩個VIP分別放在兩臺負載均衡的機器上,同時兩臺主機均為對方的備機,以作VIP的漂移,服務接管作用,加入DNS輪詢機制,使客戶端的域名分別依次解釋到兩個VIP上,形成兩臺負載均衡主機同時對外提供服務。同時也解決了單主模式下的單機性能屏頸。
二、網絡拓撲圖
三、兩臺負載均衡主機的Keepalived 配置文件
lb01 keepalived.conf
! Configuration File for keepalived global_defs { notification_email { [email protected] } notification_email_from [email protected] smtp_server 192.168.200.1 smtp_connect_timeout 30 router_id lb01 } vrrp_instance VI_1 { state MASTER interface eth1 virtual_router_id 53 priority 150 advert_int 1 authentication { auth_type PASS auth_pass 3333 } virtual_ipaddress { 10.3.150.200/24 dev eth1 label eth1:1 } } vrrp_instance VI_2 { state BACKUP interface eth1 virtual_router_id 54 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 4444 } virtual_ipaddress { 10.3.150.201/24 dev eth1 label eth1:1 } }
lb02 keepalived.conf
! Configuration File for keepalived global_defs { notification_email { [email protected] } notification_email_from [email protected] smtp_server 192.168.200.1 smtp_connect_timeout 30 router_id lb01 } vrrp_instance VI_1 { state BACKUP interface eth1 virtual_router_id 53 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 3333 } virtual_ipaddress { 10.3.150.200/24 dev eth1 label eth1:1 } } vrrp_instance VI_2 { state MASTER interface eth1 virtual_router_id 54 priority 150 advert_int 1 authentication { auth_type PASS auth_pass 4444 } virtual_ipaddress { 10.3.150.201/24 dev eth1 label eth1:1 } }
四、兩臺負載均衡主機的上的nginx配置文件
worker_processes 1; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; sendfile on; keepalive_timeout 65; server 10.3.150.198:80 weight=1; server 10.3.150.199:80 weight=1; } server { listen 80; server_name localhost; location / { proxy_pass http://server_pools; } error_page 500 502 503 504 /50x.html; location = /50x.html { root html; } } }
五、兩臺web主機,均為httpd,靜態內容(內容不一致)
六、把www.kang.com分別添加兩條A記錄,解釋IP為:10.3.150.200 與 10.3.150.201
七、從多個客戶端分別訪問www.kang.com 域名,同時觀察兩臺負載均衡的nginx訪問日誌,看是否正常,如正常,代表DNS設置成功。
八、在兩臺負載均衡主機上,分別關停keepalived服務,看是否出現VIP漂移到備機上,如漂移過去,代表設置成功。
Keepalived 之 雙主模式+DNS輪詢機制 實現高負載