配置

參考Nginx官網(wǎng)，最簡單的負(fù)載均衡配置如下：

http {
    upstream myapp1 {
        server srv1.example.com;
        server srv2.example.com;
        server srv3.example.com;
    }

    server {
        listen 80;

        location / {
            proxy_pass http://myapp1;
        }
    }
}

Nginx支持三種類型的負(fù)載均衡實(shí)現(xiàn)算法：

round-robin — requests to the application servers are distributed in a round-robin fashion,

least-connected — next request is assigned to the server with the least number of active connections,

ip-hash — a hash-function is used to determine what server should be selected for the next request (based on the client’s IP address).

其對應(yīng)的配置如下：

//Least connected load balancing
upstream myapp1 {
    least_conn;
    server srv1.example.com;
    server srv2.example.com;
    server srv3.example.com;
}
    
//Session persistence
upstream myapp1 {
    ip_hash;
    server srv1.example.com;
    server srv2.example.com;
    server srv3.example.com;
}

//Weighted load balancing
upstream myapp1 {
    server srv1.example.com weight=3;
    server srv2.example.com;
    server srv3.example.com;
}

注意事項(xiàng)

1、負(fù)載均衡服務(wù)器的配置文件，如果是再原來的/etc/nginx/nginx.conf文件上進(jìn)行修改的話，需要將include /etc/nginx/sites-enabled/*;這句話給注釋掉，否則會返回負(fù)載均衡服務(wù)器的應(yīng)用響應(yīng)。

2、修改配置文件后，記得重啟nginx

3、還有一點(diǎn)，配置文件的ip地址，可以是內(nèi)網(wǎng)ip也可以是公網(wǎng)ip，這在使用阿里云的時候要注意一下。

參考網(wǎng)站：

• Using nginx as HTTP load balancer
• nginx負(fù)載均衡配置