As an experienced website operation expert, I know that a stable backend service is crucial for any content management system, especially for enterprise-level solutions like AnQiCMS that pursue efficiency and security.The AnQi CMS is developed based on Go language, and it has won the favor of many users with its high performance and easy deployment.crontab -eHow to effectively investigate afterwards is the core of what we are discussing today.

The importance of the守护进程crontab -erole

In Linux systems, a daemon refers to a special process that runs in the background, not associated with any terminal. It operates independently of the control terminal, periodically executing certain tasks or waiting for certain events to be processed. It is the foundation of many system services (such as HTTP servers, database services).For AnQiCMS, its core application runs as a daemon, responsible for handling user requests, content publishing, scheduled tasks (such as Sitemap generation, link push) and all background logic.Once this process stops, the website cannot be accessed or provide normal services.

To ensure the continuous availability of the AnQiCMS daemon, we usually usecrontab -ecommands to configure scheduled tasks.crontabIs a Swiss Army knife-level tool in the Linux system, it allows users to schedule commands or scripts to be executed periodically at specified times. In the practice of AnQiCMS deployment, we often usecrontabConfigure a "watchdog" script (such asstart.shThis script will regularly check if the AnQiCMS main process is running, and if it finds that it has stopped, it will automatically restart it, thereby greatly improving the robustness and self-healing ability of the website.

Check the steps to run the AnQiCMS process

Completed the configurationcrontab -eAfter that, we need a systematic approach to confirm that the AnQiCMS daemon is running normally and can perform self-maintenance. Here is my summary of experience, to help you delve deeper and make a comprehensive diagnosis:

Firstly,ConfirmcrontabConfiguration itself is correct.It is the first step. Although we have executed.crontab -eAnd saved, but it is always good to check manually. You can do this bycrontab -lCommand to view the list of all scheduled tasks for the current user. Please check carefully to ensure that the startup script (such as/www/wwwroot/anqicms.com/start.shThe path, execution frequency, and permissions are all set correctly, with no spelling errors or grammatical issues. For example, a common configuration may be to check every minute.*/1 * * * * /www/wwwroot/anqicms.com/start.sh.

Next, we needCheck system process list directly. This is the most direct way, and you can see the name immediatelyanqicmsprocess is active. In the Linux terminal, you can run the following command:

ps -ef | grep '\<anqicms\>' | grep -v grep

This command will list all processesanqicmscontaining the keyword.ps -efDisplay detailed information of all processes,grep '\<anqicms\>'Filter out processes related to AnQiCMS(<and>Ensure that the match is a complete word.anqicmsAvoid mis-matching)，whilegrep -v grepIt is used to excludegrepThe process of the command itself, making the result purer. If one or more lines containinganqicmsThe process information, especially including its startup path andnohupauto English，so congratulations, the AnQiCMS daemon is likely running normally.

Just seeing the process ID is not enough, we needCheck the AnQiCMS runtime log,"especiallystart.shscripts usually generate thecheck.logandrunning.logfiles. According toinstall.mdDocument instart.shScript example, it will log the process check and start logs tocheck.logAnd the output of the AnQiCMS application itself will be redirected torunning.log. You can enter the installation directory of AnQiCMS (for example)/www/wwwroot/anqicms.com/)，then usetail -f check.logandtail -f running.logcommand to view the latest log information in real time. Incheck.logyou should see something likeBINNAME PID check: 1(indicating that the process exists) orBINNAME NOT runningafternohuprecords of startup. This indicatescrontabthe checks are being performed as scheduled and processes are started when necessary. Inrunning.logIn it, you will see the startup information of the AnQiCMS application itself, daily operation records, and even potential error reports.If there is a normal startup log here and no continuous error output, it means that the core function of the AnQiCMS application is working normally.

the fourth step, we canverify the listening status of the portAnQiCMS as a network service, needs to listen to a specific port (default is 8001) to provide external services. You can uselsof -i:{端口号}Command to check if the port is being listened by AnQiCMS process. For example:

lsof -i:8001

If the output showsanqicmsThe process isLISTEN(Listen) Port 8001, this further confirms the normal operation of the application.If the port is occupied by other processes or AnQiCMS does not successfully listen, you will not see the expected results.install.mdOne of the common troubleshooting methods mentioned.

Finally, the most intuitive verification isAccess your website or backend management interface via a browserEnter the domain name you have bound in the browser (for example)http://yourdomain.com/) and the backend address (for example)http://yourdomain.com/system/）。If the front-end content of the website can be loaded normally, and the back-end can log in and operate smoothly, then all these background checks have received the most actual verification.

Common Questions (FAQ)

1. Why does my AnQiCMS daemon need to be started throughcrontab -eto maintain, rather than directly starting? Answer:Starting the AnQiCMS process directly may allow it to run, butcrontab -eThe function of auto provides a 'guard' mechanism.It ensures that AnQiCMS automatically starts after the server restarts, or automatically detects and restarts the process if the program crashes unexpectedly due to certain reasons (such as memory overflow, code errors, or external attacks).This greatly improves the stability and availability of the website, reduces the need for manual intervention, and achieves unmanned automated operation and maintenance.

2.start.shscript, make sure it points to the correct directory of the AnQiCMS executable file, and that the directory containsBINNAMEandBINPATHWhat is the role of variables, do I need to modify them? Answer: BINNAMEandBINPATHYesstart.shThe two key variables defined in the script:

  • BINNAME指定的 AnQiCMS 可执行文件的名称，默认为anqicms.
  • BINPATHSpecified the absolute path of AnQiCMS installation. These variables are used to tell the script where to find and run the main program of AnQiCMS.install.md文档的指引，将anqicms可执行文件放在/www/wwwroot/anqicms.com/In the directory, and without changing the file name, you do not need to manually modify these two variables. But if you change the name of the AnQiCMS executable file or deploy it to a different path, you need to modify them accordingly.start.shscript, make sure it points to the correct directory of the AnQiCMS executable file, and that the directory containsBINNAMEandBINPATHTo ensure that the script can correctly find and manage the AnQiCMS process.

3. If I have performed all the above checks,crontabAlready configured, but the AnQiCMS process is still not running, or the website cannot be accessed, what should I do? Answer:If you encounter this situation, you need to conduct a more in-depth investigation.

  • Checkstart.sh脚本权限：Ensurestart.shThe script has execution permissions. You can usechmod +x /path/to/start.shcommands to grant it execution permissions.
  • run manuallystart.sh:try to manually execute it in the terminalcd /path/to/anqicms.com && ./start.shObserve any error output, which will help locate the problem.
  • Check the system log:In addition to AnQiCMS' own logs, you can also view system-level log files, such as/var/log/syslog//var/log/messagesor/var/log/cronThese logs may recordcrontabThe reason for the task execution failure, or the underlying system error encountered when starting the AnQiCMS process.
  • Port conflict: Even though `lsof -i:`}]