Nginx web负载均衡配置

下载nginx

• http://nginx.org/en/download.html

wget http://nginx.org/download/nginx-1.20.2.tar.gz

安装nginx

• 参考: https://www.cnblogs.com/-wei/p/15219624.html

./configure --prefix=/opt/nginx
或
./configure --prefix=/opt/nginx --with-http_ssl_module
make
make install

报错

• ./configure: error: the HTTP rewrite module requires the PCRE library

yum -y install pcre-devel

• ./configure: error: the HTTP gzip module requires the zlib library.

yum -y install zlib-devel

• ./configure: error: SSL modules require the OpenSSL library.

yum -y install openssl openssl-devel

nginx限制请求数据包大小

client_max_body_size 1000m;

负载均衡配置

• 参考: https://www.cnblogs.com/telwanggs/p/14977290.html

  upstream test_group {
        # If there is no specific strategy, round-robin
        #     would be the default strategy.
        # least_conn;
        # ip_hash;
        server 172.16.217.109:8501 weight=1 max_fails=2 fail_timeout=30s;
        server 172.16.217.109:8502 weight=1 max_fails=2 fail_timeout=30s;
    }
    
    location / {
            #root   html;
            #index  index.html index.htm;
            client_max_body_size 3m;
            proxy_pass http://test_group;
    }

nginx负载均衡策略

• 轮询：将客户端发起的请求，平均分配给每一台服务器
• 权重：将客户的的请求，根据服务器的权重值不同，分配不同的数量
• ip_hash：基于发起请求的客户端的ip地址不同，他始终会将请求发送到指定的服务器上，客户端ip地址不变，就会一直发送到一个服务器上。

轮询

upstream my_server{
    server IP:8080;
    server IP:8081;
}
server {
    listen       80;
    listen  [::]:80;
    server_name  localhost;

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

权重

upstream my_server{
    server IP:8080 weight=10;
    server IP:8081 weight=2;
}
server {
    listen       80;
    listen  [::]:80;
    server_name  localhost;

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

ip_hash

upstream my_server{
    ip_hash;
    server IP:8080 weight=10;
    server IP:8081 weight=2;
}
server {
    listen       80;
    listen  [::]:80;
    server_name  localhost;

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