What related information will the log file of AnQiCMS record after the service stops?

As an experienced website operations expert, I know the importance of system logs in maintaining website stability and troubleshooting.It is like a black box of an airplane, recording every detail of the system's operation, especially when the service stops unexpectedly, the log files are the 'golden clues' for us to quickly locate problems and restore the service.AnQiCMS is an enterprise-level content management system developed based on the Go language, with a rigorous and efficient logging mechanism that can provide us with rich information.

When we talk about 'What relevant information will the log file of AnQiCMS service record after it stops?' it is actually exploring the 'self-report' of the system when it encounters an exception.This information not only helps us understand the cause of the problem, but also guides us in taking effective measures to solve it.

The core role and location of the AnQiCMS log file

AnQiCMS during startup and operation will log important events and status information to the log file. According to the deployment method I understand, the most core log file is usuallyrunning.logandcheck.log.

• running.logThis file passesnohupThe command (in a non-Docker deployed Linux environment) collects the standard output (stdout) and standard error (stderr) of the AnQiCMS application.This means that any information printed by the application while it is running, processing requests, as well as any stack trace information thrown during errors or exceptions, will be recorded in this file.It is the primary basis for identifying application logic errors and runtime exceptions.
• check.logIn the startup scriptstart.shIn it, AnQiCMS will periodically check its process ID (PID) and record the results.check.logThis mainly reflects the lifecycle management status of the service process, such as whether the service has been successfully started, whether it is running, and so on.

Whether it is deployed through the "Go project" of Baota panel or manually deployed through the command line, these log files are usually stored in the root directory of the AnQiCMS installation directory. If it is deployed in a Docker container, the logs are located inside the container and can be accessed bydocker logs [容器ID/名称]Check the command, or map Docker volumes to the host machine through configuration, for persistence and management.

Key information in the log when the service stops

When the AnQiCMS service stops unexpectedly,running.logit will be our focus. It usually records the following types of key information:

1. service lifecycle eventsIf the service stops due to an exception, the log will display the last event that occurred before the service terminated.This may be a fatal error, a panic (Go language panic), or a failure of graceful shutdown due to an external signal.The log usually contains timestamphelp us lock in the time point when the problem occurred. In addition, it will also recordlog levelAs examples INFO, WARNING, ERROR, FATAL, quickly distinguish the severity of events.

2. Go runtime exceptionSince AnQiCMS is developed in Go language, when the service crashes,running.logit is likely to contain Go language'sstack trace information (stack trace). This is a very detailed error report, which lists all the function call sequences that led to the crash, as well as the code line where the error occurred.By analyzing this stack information, developers can quickly locate code-level defects, such as null pointer references, concurrent deadlocks, array out-of-bounds, and other runtime issues unique to the Go language.

3. Database interaction failureAnQiCMS as a content management system has a high dependency on the database. The service may have stopped due to exceptions in database connection or operation. The log may record:

   • Database connection failedIf the username or password is incorrect, the database service is not started, the network is down, or the connection timed out.
   • SQL execution errorFor example, SQL statement syntax error, violation of database constraints (such as unique index), data type mismatch, etc.
   • Database connection pool exhaustedUnder high concurrency scenarios, improper configuration of the database connection pool may lead to errors when unable to obtain a database connection.

4. File system operation exceptionAnQiCMS involves a large number of file operations, including:

   • Reading or writing template filesIf the template file is damaged, lacks permissions, or there is a disk I/O error, it may cause the page to fail to render or even cause the service to interrupt.
   • Uploading and managing resource filesWhen a user uploads images or attachments, if the target storage path does not exist, there is not enough disk space, or permissions are restricted, related errors will be recorded in the log.
   • Generation of SEO-related files: Sitemap, Robots.txt, and other file generation or update failures may be due to permission or disk issues.
   • Data backup and recoveryIf AnQiCMS is configured with a data backup function, the file operation errors encountered during the backup or recovery process will also be accurately recorded.

5. External service integration issueAnQiCMS offers rich integration features such as link push (Baidu, Bing), content collection, etc. If the service stops due to these features, the log may contain:

   • External API call failedFor example, when pushing the Baidu/Bing link, the API key is invalid, the interface response is abnormal, or the network request timeout.
   • Content collection failure: The target website is inaccessible, the data structure has changed, the parsing fails, or an exception occurs while processing the collected content.

6. System configuration loading errorAnQiCMS runs normally depending on the correct configuration. Ifconfig.jsonThe configuration file may encounter format errors, missing key parameters, or port conflicts in multi-site configurations when loaded, which may prevent the service from starting normally or may crash during runtime due to configuration issues, the logs will clearly point out these configuration parsing errors.

7. Resource exhaustion or environmental issuesAlthough AnQiCMS is a Go language application, it usually occupies less resources, but in extreme cases, logs