lvs+keepalived+nginx實現高性能負載均衡搭建

 

環境服務配置：

兩臺Nginx服務器

Nginx 主服務器  192.168.212.143

Nginx 備服務器  192.168.212.144

Lvs 虛擬VIP     192.168.212.110

前面三個一定要相同

Keepalived 環境搭建：

1.下載keepalived

wget http://www.keepalived.org/software/keepalived-1.2.18.tar.gz

2.解壓安裝：

tar -zxvf keepalived-1.2.18.tar.gz -C /usr/local/

3.下載插件openssl

yum install -y openssl openssl-devel（需要安裝一個軟件包）

4.開始編譯keepalived

cd keepalived-1.2.18/ && ./configure --prefix=/usr/local/keepalived

5.make一下

make && make install

注意事項：

報錯: eepalived執行./configure --prefix=/usr/local/keepalived時報錯：configure: error: Popt libraries is required

出現此錯誤的原因：

未安裝popt的開發包

解決方法：

yum install popt-devel

安裝好popt的開發包。重新./configure 即可。

keepalived安裝成Linux系統服務：

將keepalived安裝成Linux系統服務，因爲沒有使用keepalived的默認安裝路徑（默認路徑：/usr/local）,安裝完成之後，需要做一些修改工作：

首先創建文件夾，將keepalived配置文件進行復制：

mkdir /etc/keepalived

cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

然後複製keepalived腳本文件：

cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/

cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

ln -s /usr/local/sbin/keepalived /usr/sbin/

ln -s /usr/local/keepalived/sbin/keepalived /sbin/

可以設置開機啓動：chkconfig keepalived on，到此我們安裝完畢!

keepalived 常用命令：

service keepalived start
service keepalived stop

keepalived 啓動報錯問題處理：

啓動報錯Starting keepalived (via systemctl):  Job for keepalived.service failed. See 'systemctl status keepalived.service' and 'journalctl -xn' for details.  
解決辦法
[root@edu-proxy-01 sbin]# cd /usr/sbin/  
[root@edu-proxy-01 sbin]# rm -f keepalived   
[root@edu-proxy-01 sbin]# cp /usr/local/keepalived/sbin/keepalived  /usr/sbin/  

keepalived 配置文件實例：

vi /etc/keepalived/keepalived.conf

! Configuration File for keepalived

vrrp_script chk_nginx {
    script "/etc/keepalived/nginx_check.sh" #運行腳本，腳本內容下面有，就是起到一個nginx宕機以後，自動開啓服務
    interval 2 #檢測時間間隔
    weight -20 #如果條件成立的話，則權重 -20
}
# 定義虛擬路由，VI_1 爲虛擬路由的標示符，自己定義名稱
vrrp_instance VI_1 {
    ###MASTER 主的意思  BACKUP 從
    state MASTER #來決定主從
    interface ens33 # 綁定虛擬 IP 的網絡卡，根據自己的機器填寫
    virtual_router_id 121 # 虛擬路由的 ID 號， 兩個節點設置必須一樣
    mcast_src_ip 192.168.212.143 #填寫本機ip
    priority 100 # 節點優先級,主要比從節點優先級高
    nopreempt # 優先級高的設置 nopreempt 解決異常恢復後再次搶佔的問題
    advert_int 1 # 組播信息發送間隔，兩個節點設置必須一樣，默認 1s
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    # 將 track_script 塊加入 instance 配置塊
    track_script {
        chk_nginx #執行 Nginx 監控的服務
    }
    ### 虛擬IP地址配置規範 假設192.168.212.143 
    virtual_ipaddress {
        192.168.212.110 # 虛擬ip,也就是解決寫死程序的ip怎麼能切換的ip,也可擴展，用途廣泛。可配置多個。
    }
}

nginx_check.sh 內容：

#!/bin/bash
A=`ps -C nginx –no-header |wc -l`
if [ $A -eq 0 ];then
    /usr/local/nginx/sbin/nginx
    sleep 2
    if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
        killall keepalived
    fi
fi