Nginx+Keepalived主備負載均衡學習筆記

實驗環境及軟體版本：

CentOS版本：    6.6(2.6.32.-504.el6.x86_64)

nginx版本：     nginx-1.6.2

keepalived版本：keepalived-1.2.7

準備工作：

關閉防火牆：service iptables stop

            chkconfig iptables off

關閉selinux: sed -i 's/SELINUX=disabled/SELINUX=enforcing/g' /etc/selinux/config

             init 6 重新開機系統一定要！

1.準備安裝依賴包:

yum -y install pcre pcre-devel openssl openssl-devel zlib zlib-devel gcc gcc-c++ popt-devel

安裝keepalived出現configure: error: Popt libraries is required

解決方法:yum -y install popt-devel

2.下載下傳安裝包

wget http://nginx.org/download/nginx-1.6.2.tar.gz

wget http://www.keepalived.org/software/keepalived-1.2.7.tar.gz

3.安裝NginX

tar zxvf nginx-1.6.2.tar.gz

cd nginx-1.6.2

./configure

make && make install

4.安裝keepalived

tar zxvf keepalived-1.2.7.tar.gz

cd keepalived-1.2.7

make 

make install

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

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

mkdir /etc/keepalived

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

cp /usr/local/sbin/keepalived /usr/sbin/

5.加入開機自啟動服務

方法一

echo "/usr/local/nginx/sbin/nginx" >> /etc/rc.local

echo "/etc/init.d/keepalived start" >> /etc/rc.local

方法二

[root@nginx keepalived-1.2.7]# cat >>/etc/rc.local<<EOF

> /usr/local/nginx/sbin/nginx

> /etc/init.d/keepalived start

> EOF

[root@nginx keepalived-1.2.7]# cat /etc/rc.local

#!/bin/sh

#

# This script will be executed *after* all the other init scripts.

# You can put your own initialization stuff in here if you don't

# want to do the full Sys V style init stuff.

touch /var/lock/subsys/local

/usr/local/nginx/sbin/nginx

/etc/init.d/keepalived start

6.配置

  6.1 配置nginx

      兩台接入伺服器的nginx的配置完全一樣,主要配置/usr/local/nginx/conf/nginx.conf的http.其中多域名指向是通過虛拟主機(配置http下面的server)實作;同一域名的不同虛拟目錄通過每

  個server下面的不同location實作.

  http {

    include       mime.types;

    default_type  application/octet-stream;

    #log_format  main  '$remote_addr - $remote_user [$time_local] "$re

quest" '

    #                  '$status $body_bytes_sent "$http_referer" '

    #                  '"$http_user_agent" "$http_x_forwarded_for"';

    #access_log  logs/access.log  main;

    sendfile        on;

    #tcp_nopush     on;

    #keepalive_timeout  0;

     keepalive_timeout  65;

    #gzip  on;

    upstream myserver{

      server 192.168.0.110:80  max_fails=3 fail_timeout=20s;

      server 192.168.0.111:80  max_fails=3 fail_timeout=20s;

      ip_hash;

    }

     server {

        listen       80;

        server_name  192.168.0.150;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {

            root /var/www/html;

            index index.php index.htm index.html;

            proxy_redirect off;

            proxy_set_header Host $host;

            proxy_set_header X-Real-IP $remote_addr;

            proxy_next_upstream http_500 http_502 http_503 error timeo

ut invalid_header;

            proxy_set_header X-Forwarded-For $remote_addr;

            proxy_pass   http://myserver;

        }

}

  6.2 配置keepalived

      按照上面的安裝方法,keepalived的配置檔案在/etc/keepalived/keepalived.conf.主、從伺服器的

　配置相關聯但有所不同。如下：

　Master:

  ! Configuration File for keepalived

global_defs {

   notification_email {

     [email protected]

     [email protected]

     [email protected]

   }

   notification_email_from [email protected]

   smtp_server smtp.etiantian.org

   smtp_connect_timeout 30

   router_id nginx_master

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 {

        192.168.0.150

  Backup:

   router_id nginx_backup

    state BACKUP

    priority 99

7.驗證：

      先後在主、從伺服器上啟動/usr/local/nginx/sbin/nginx

                              /etc/init.d/keepalived start

      在主伺服器上檢視是否已經綁定了虛拟IP(VIP):ip addr

      [root@nginx ~]# ip addr

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 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:00:4e brd ff:ff:ff:ff:ff:ff

    inet 192.168.0.130/24 brd 192.168.0.255 scope global eth0

    inet 192.168.0.150/32 scope global eth0

    inet6 fe80::20c:29ff:feaf:4e/64 scope link 

      停止主伺服器上的keepalived:/etc/init.d/keepalived stop然後在從伺服器上檢視是否已經綁

      定了虛拟IP(VIP):

       [root@nginx_back ~]# ip addr

    link/ether 00:0c:29:21:b6:b1 brd ff:ff:ff:ff:ff:ff

    inet 192.168.0.131/24 brd 192.168.0.255 scope global eth0

    inet6 fe80::20c:29ff:fe21:b6b1/64 scope link 

      啟動主伺服器上的keepalived:/etc/init.d/keepalived start,再看看主伺服器能否重新接管虛拟IP(VIP)

本文轉自 linuxzkq 51CTO部落格，原文連結:http://blog.51cto.com/linuxzkq/1631209