Nginx如何进行流量按比例转发

split_clients $variable {
    percentage1 backend1;
    percentage2 backend2;
    ...
    default backend_default;
}

# 按比例分配流量
split_clients $remote_addr {
    70% backend1;
    30% backend2;
}

# 定义后端服务器组
upstream backend1 {
    server backend1.example.com:80;
}

upstream backend2 {
    server backend2.example.com:80;
}

# 虚拟主机配置
server {
    listen 80;
    server_name yourdomain.com;

    location / {
        # 根据split_clients的结果转发请求
        proxy_pass http://$split_clients;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
}

sudo nginx -s reload

# 定义后端服务器组
upstream backend {
    # 权重为 7，表示大约接收 70% 的流量
    server backend1.example.com:80 weight=7; 
    # 权重为 3，表示大约接收 30% 的流量
    server backend2.example.com:80 weight=3; 
}

# 虚拟主机配置
server {
    listen 80;
    server_name yourdomain.com;

    location / {
        # 转发请求到后端服务器组
        proxy_pass http://backend;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
}

# 定义后端服务器组
upstream backend1 {
    server backend1.example.com:80;
}

upstream backend2 {
    server backend2.example.com:80;
}

# 虚拟主机配置
server {
    listen 80;
    server_name yourdomain.com;

    location / {
        # 使用 Lua 脚本进行流量分配
        access_by_lua_block {
            math.randomseed(os.time())
            local random_num = math.random(1, 10)
            if random_num <= 7 then
                ngx.var.proxy_pass = "http://backend1"
            else
                ngx.var.proxy_pass = "http://backend2"
            end
        }
        # 转发请求
        proxy_pass $proxy_pass;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
}

sudo nginx -s reload