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

As an experienced website operation expert, I fully understand the importance of system logs in maintaining website stability and troubleshooting.It is like the black box of an airplane, recording all the details of system operation, especially when the service unexpectedly stops, log files are our 'gold clues' for quickly locating problems and restoring services.AnQiCMS as an enterprise-level content management system developed in Go language has a rigorous and efficient logging mechanism, which can provide us with rich information.

When discussing 'What related information will the log files of AnQiCMS record after the service stops?' it is actually exploring the 'self-report' of the system when encountering exceptions.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 AnQiCMS log file

AnQiCMS during startup and operation, will write its 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.log：This file is processed bynohupCommand (in non-Docker deployed Linux environments) collects the standard output (stdout) and standard error (stderr) of the AnQiCMS application.This means any information printed by the application while running normally, 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.log：In the startup scriptstart.shIn it, AnQiCMS will regularly check its process ID (PID), and record the check results tocheck.logThis mainly reflects the lifecycle management status of the service process, such as whether the service has been successfully started, whether it is running, etc.

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

Critical information in the log when the service stops

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

1. service lifecycle eventsIf the service stops due to an abnormal reason, the log will display the last event that occurred before the service stopped.This may be a fatal error, a panic (Go language panic), or a failure of graceful shutdown due to an external signal.Timestamp，precise to milliseconds, helping us lock in the time point when the problem occurs. In addition, it will also recordlog level(such as INFO, WARNING, ERROR, FATAL), quickly distinguish the severity of events.

2. Go language runtime exceptionSince AnQiCMS is developed in Go language, when the service crashes,running.logit is likely to contain Go language relatedstack 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 line of code 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 Go-specific runtime issues.

3. Database interaction failureAnQiCMS as a content management system, has a high dependency on the database. Service downtime may be closely related to database connection or operation exceptions. The log may record:

   • Database connection failed: If the username or password is incorrect, the database service is not started, the network is not accessible, or the connection times out.
   • SQL execution errorFor example, SQL statement syntax errors, violations of database constraints (such as unique indexes), and data type mismatches, etc.
   • Database connection pool exhaustedEnglish: In high-concurrency scenarios, improper configuration of the database connection pool may lead to errors when attempting to acquire a database connection.

4. English: Exception in file system operationAnQiCMS involves a large number of file operations, including:

   • Reading or writing template filesIf the template file is corrupted, insufficient permissions, or there is a disk I/O error, it may cause page rendering to fail even lead to service interruption.
   • Resource file upload and management：When the user uploads images or attachments, if the target storage path does not exist, there is insufficient disk space, or permissions are restricted, related errors will be recorded in the log.
   • SEO-related file generation：Sitemap、Robots.txt等文件的生成或更新失败，可能由于权限或磁盘问题。The generation or update of files such as Sitemap and Robots.txt failed, possibly due to permission or disk issues.
   • 数据备份与恢复。Data backup and recovery.If AnQiCMS is configured with the data backup function, any file operation errors encountered during the backup or recovery process will also be accurately recorded.

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

   • External API call failedFor example, when pushing links of Baidu/Bing, the API key is invalid, the interface response is abnormal, or the network request timeout.
   • Content collection failureThe target website is inaccessible, the data structure has changed causing parsing to fail, or an exception occurred while processing the collected content.

6. Error loading system configurationThe normal operation of AnQiCMS depends 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 cause the service to fail to start normally or crash during runtime due to configuration issues, and the logs will clearly indicate these configuration parsing errors.

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