nginx + keepalived 双机热备

sudo apt-get install nginx 

sudo find / -name nginx.conf
/etc/nginx/nginx.conf

user www-data;
worker_processes 4;
pid /run/nginx.pid;

events {
    worker_connections 1024;
}

http {
    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;

    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;

    server {
        listen 80 default_server;
        server_name test;
        charset utf-8;

        location / {
        root html;
        index index.html index.htm;
        proxy_set_header X-Real_IP $remote_addr;
        client_max_body_size 100m;
        }
    }
}

sudo service nginx start  

sudo service nginx stop

tar –zxvf keepalived-1.2.19.tar.gz
cd keepalived-1.2.19
./configure --prefix=/usr/local/keepalived
make
sudo make install

sudo apt-get install libssl.dev

sudo ln -s /usr/local/keepalived/sbin/keepalived /sbin/
sudo ln -s /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
sudo ln -s /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

sudo keepalived -D -f /usr/local/keepalived/etc/keepalived/keepalived.conf

sudo killall keepalived

global_defs {
    router_id NODEA
}

vrrp_instance VI_1 {
    state MASTER 
    interface eth0        #监测网络接口 
    virtual_router_id 50  #主、备必须一样  
    priority 100          #优先级：主＞备
    advert_int 1
    authentication {
        auth_type PASS #VRRP认证，主备一致
        auth_pass 1111  #密码
}

virtual_ipaddress {
        192.168.174.140/24 #VRRP HA虚拟地址
    }
}

global_defs {
   router_id NODEB
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 50
    priority 90 
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }

 virtual_ipaddress {
    192.168.174.140/24
    }
}

global_defs {
    router_id NODEA
}

vrrp_script chk_http_port {
    script "/home/jimite/keepalived/chk_nginx_pid.sh"
    interval 2
    weight 2
}

vrrp_instance VI_1 {
    state MASTER 
    interface eth0
    virtual_router_id 50
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    track_script {
        chk_http_port
    }
    virtual_ipaddress {
        192.168.174.140/24
    }
}

global_defs {
   router_id NODEB
}

vrrp_script chk_http_port {
    script "/home/jihite/keepalived/chk_nginx_pid.sh"
    interval 2
    weight 2
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 50
    priority 90 
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
   track_script {
       chk_http_port
   }

    virtual_ipaddress {
    192.168.174.140/24
    }
}

#!/bin/bash
A=`ps -C nginx --no-header |wc -l`
if [ $A -eq 0 ]
then
    echo 'nginx server is died'
    sudo killall keepalived
fi