The stub_status module in Nginx is mainly used to view some status information of Nginx.
This module will not be compiled into Nginx by default. If you want to use this module, you must specify when compiling and installing Nginx:
<code><span>.</span>/configure –<span>with</span><span>-http_stub_status_module</span></code>
Java code
<code>[root<span>@10</span>.<span>10.90</span>.<span>97</span> ~]<span># ./configure --prefix=/usr/local/nginx --with-http_stub_status_module </span> [root<span>@10</span>.<span>10.90</span>.<span>97</span> ~]<span># make && make install </span></code>
Check whether the installed Nginx contains the stub_status module
<code><span>#/usr/local/nginx/sbin/nginx</span><span>-</span><span>V</span><span>nginx</span><span>version:</span><span>nginx/0</span><span>.</span><span>6</span><span>.</span><span>32</span><span>built</span><span>by</span><span>gcc</span><span>3</span><span>.</span><span>4</span><span>.</span><span>6</span><span>20060404</span><span>(Red</span><span>Hat</span><span>3</span><span>.</span><span>4</span><span>.</span><span>6</span><span>-</span><span>10)</span><span>configure</span><span>arguments:</span><span>-</span><span>-</span><span>user=nginx</span><span>-</span><span>-</span><span>group=nginx</span><span>-</span><span>-</span><span>prefix=/home/nginx</span><span>-</span><span>-</span><span>with</span><span>-</span><span>http_stub_status_module</span></code>
You can see I installed this module. Note that -V -v will only display the version nginx version: nginx/0.6.32
Start configuring nginx, just add location to the server block
<code>server{ location /nginx-status { allow <span>-------- </span> allow <span>--------//允许的ip </span> deny all<span>;// </span> stub_status <span><span>on</span>; </span> access_log off; } } </code>
Restart nginx
killall -s HUP nginx
Then just request www.domain.com/nginx-status. Here are the results
<code><span>Active</span> connections: <span>5</span>server accepts handled requests <span>5970806143</span><span>5970806143</span><span>7560482010</span>Reading: <span>0</span> Writing: <span>5</span> Waiting: <span>0</span></code>
Active connections: The number of active connections initiated to the backend.
Server accepts handled requests: Nginx processed a total of 38810620 connections, successfully created 38810620 handshakes (proof that there were no failures in the middle), and processed a total of 298655730 requests.
Reading: The number of header information read by Nginx from the client.
Writing: The number of header information returned by Nginx to the client.
Waiting: When keep-alive is turned on, this value is equal to active – (reading + writing), which means that Nginx has completed processing and is waiting for the next resident connection to request the command.
Therefore, when the access efficiency is high and the request is processed quickly, it is normal for the number of Waiting to be relatively high. If the number of reading + writing is large, it means that the amount of concurrent access is very large and is being processed.
The above introduces welcome to nginx nginx to enable stub_status module monitoring, including the content of welcome to nginx. I hope it will be helpful to friends who are interested in PHP tutorials.

Reasons for PHPSession failure include configuration errors, cookie issues, and session expiration. 1. Configuration error: Check and set the correct session.save_path. 2.Cookie problem: Make sure the cookie is set correctly. 3.Session expires: Adjust session.gc_maxlifetime value to extend session time.

Methods to debug session problems in PHP include: 1. Check whether the session is started correctly; 2. Verify the delivery of the session ID; 3. Check the storage and reading of session data; 4. Check the server configuration. By outputting session ID and data, viewing session file content, etc., you can effectively diagnose and solve session-related problems.

Multiple calls to session_start() will result in warning messages and possible data overwrites. 1) PHP will issue a warning, prompting that the session has been started. 2) It may cause unexpected overwriting of session data. 3) Use session_status() to check the session status to avoid repeated calls.

Configuring the session lifecycle in PHP can be achieved by setting session.gc_maxlifetime and session.cookie_lifetime. 1) session.gc_maxlifetime controls the survival time of server-side session data, 2) session.cookie_lifetime controls the life cycle of client cookies. When set to 0, the cookie expires when the browser is closed.

The main advantages of using database storage sessions include persistence, scalability, and security. 1. Persistence: Even if the server restarts, the session data can remain unchanged. 2. Scalability: Applicable to distributed systems, ensuring that session data is synchronized between multiple servers. 3. Security: The database provides encrypted storage to protect sensitive information.

Implementing custom session processing in PHP can be done by implementing the SessionHandlerInterface interface. The specific steps include: 1) Creating a class that implements SessionHandlerInterface, such as CustomSessionHandler; 2) Rewriting methods in the interface (such as open, close, read, write, destroy, gc) to define the life cycle and storage method of session data; 3) Register a custom session processor in a PHP script and start the session. This allows data to be stored in media such as MySQL and Redis to improve performance, security and scalability.

SessionID is a mechanism used in web applications to track user session status. 1. It is a randomly generated string used to maintain user's identity information during multiple interactions between the user and the server. 2. The server generates and sends it to the client through cookies or URL parameters to help identify and associate these requests in multiple requests of the user. 3. Generation usually uses random algorithms to ensure uniqueness and unpredictability. 4. In actual development, in-memory databases such as Redis can be used to store session data to improve performance and security.

Managing sessions in stateless environments such as APIs can be achieved by using JWT or cookies. 1. JWT is suitable for statelessness and scalability, but it is large in size when it comes to big data. 2.Cookies are more traditional and easy to implement, but they need to be configured with caution to ensure security.


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