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nginx 会话保持

news 2026/5/12 7:56:02

对于经过NAT网关的用户，nginx可以通过以下几种方式实现会话保持：

1. 基于Cookie的会话保持

1.1 sticky-cookie模块

upstream backend {server 192.168.1.10:8080;server 192.168.1.11:8080;# 使用sticky cookie实现会话保持sticky cookie srv_id expires=1h domain=.example.com path=/;
}

1.2 第三方sticky模块

upstream backend {server 192.168.1.10:8080;server 192.168.1.11:8080;# 使用nginx-sticky-modulesticky;sticky_hide_cookie upstream=;
}

2. 基于URI的会话保持

upstream backend {hash $request_uri consistent;server 192.168.1.10:8080;server 192.168.1.11:8080;
}

3. 基于自定义Header的会话保持

# 提取用户标识Header
map $http_x_user_id $backend_pool {default "";"~*" $http_x_user_id;
}upstream backend {hash $backend_pool consistent;server 192.168.1.10:8080;server 192.168.1.11:8080;
}

4. 应用层会话标识

4.1 基于Session ID

# 从Cookie中提取session id
map $cookie_jsessionid $session_backend {default "";"~*(.+)" $1;
}upstream backend {hash $session_backend consistent;server 192.168.1.10:8080;server 192.168.1.11:8080;
}

4.2 基于Token

# 从Authorization头提取token
map $http_authorization $token_backend {default "";"~*Bearer\s+(.+)" $1;
}upstream backend {hash $token_backend consistent;server 192.168.1.10:8080;server 192.168.1.11:8080;
}

5. 完整的NAT用户会话保持配置示例

http {# 定义后端服务器组upstream backend_servers {# 使用consistent hash算法hash $consistent_key consistent;server 192.168.1.10:8080 weight=3;server 192.168.1.11:8080 weight=2;server 192.168.1.12:8080 weight=1;}# 定义一致性hash的key# 优先级：session id > user token > 其他标识map $cookie_sessionid $consistent_key {default $cookie_sessionid;"" $http_x_user_token;}map $consistent_key $consistent_key_final {default $consistent_key;"" $remote_addr$http_user_agent; # 最后回退到IP+UA组合}server {listen 80;server_name example.com;location / {# 设置会话保持cookie（如果应用没有提供）add_header Set-Cookie "sessionid=$upstream_http_x_session_id; Path=/; HttpOnly" always;proxy_pass http://backend_servers;proxy_set_header Host $host;proxy_set_header X-Real-IP $remote_addr;proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;proxy_set_header X-Forwarded-Proto $scheme;# 健康检查proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;proxy_connect_timeout 30s;proxy_read_timeout 30s;}# 健康检查端点location /health {access_log off;proxy_pass http://backend_servers;}}
}

6. 使用Nginx Plus的会话保持功能

如果使用Nginx Plus，可以使用更强大的会话保持功能：

upstream backend {zone backend 64k;server 192.168.1.10:8080;server 192.168.1.11:8080;# Nginx Plus的sticky route功能sticky route $route_cookie $route_uri;
}

7. 针对不同场景的建议

7.1 Web应用场景

# 优先使用session cookie
map $cookie_jsessionid $backend_key {default $cookie_jsessionid;"" $cookie_phpsessid;
}upstream web_backend {hash $backend_key consistent;server 192.168.1.10:8080;server 192.168.1.11:8080;
}

7.2 API服务场景

# 使用API token或自定义header
map $http_authorization $api_key {default $http_authorization;"" $http_x_api_key;
}upstream api_backend {hash $api_key consistent;server 192.168.1.20:8080;server 192.168.1.21:8080;
}