How to ensure that only the target AnQiCMS process is terminated when stopping the script, and not other同名 processes?

As a website operator who deeply understands the operation of AnQiCMS, I know the importance of precise control of website services.In routine maintenance, stopping or restarting services is a common operation, but ensuring that only the target process is terminated, rather than inadvertently affecting other unrelated or similarly named processes, is a challenge that technicians must face.AnQiCMS designed its shutdown script with full consideration of this requirement, achieving precise identification and termination of specific AnQiCMS processes through the clever use of Linux command-line tools and clear naming conventions.

Stop any running application processes, which usually involves finding their process identifier (PID) and then sending a termination signal to that PID.However, in a complex server environment, there may be multiple applications running simultaneously, and even some unrelated process names may accidentally include the string of the target application.In this case, if we rely solely on fuzzy name matching to search for processes, it may lead to the risk of "killing the wrong process", causing service interruption or data anomalies.

AnQiCMSstop.shThe script is designed to circumvent this risk. The core of the script lies in its combination use ofps/grepandawkUsing standard Linux command-line tools to accurately locate the target AnQiCMS process. Specifically, the script will perform the following key steps:

Firstly, the script will executeps -efCommand to list detailed information of all running processes on the system.ps -efProvided a complete list of processes, including process ID (PID), parent process ID (PPID), CPU utilization, memory usage, start time, and the complete command path, providing a rich data source for subsequent filtering.

Next, the script willps -efthe output through the pipeline togrep '\<anqicms\>'command. Here is thegrepcommand is the key to accurate recognition. It uses\<and\>These two special regular expression metacharacters, they represent the 'start of a word' and 'end of a word' respectively. This meansgrepIt will strictly match 'anqicms' as an independent word appearing, not any substring containing 'anqicms' in the process name. For example, if there is a process namedmyanqicmsapportest_anqicmsThe process, thisgrepcommand will not treat it as a target process, thereby effectively avoiding collateral damage.

To further improve accuracy, the subsequentgrep -v grepoperation is standard practice. Because the previousgrepThe command itself is also a process, and the word 'grep' is also included in its command line. If this filter is not added, it may also include itself in the results.grep -vThe function is to reverse match, that is, to exclude all lines containing 'grep', ensuring that only the actual AnQiCMS processes remain in the final result.

Finally, the filtered results are directed toawk '{printf $2}'.ps -efThe output, the process ID (PID) is usually located in the second column.awkThe function of the tool here is to extract this column of data and use it as the unique identifier (PID) for the AnQiCMS process.If AnQiCMS process is found, its PID will be captured and stored in the script variable.

After obtaining the exact PID, the script will perform a simple judgment: if the PID exists (i.e.exists -ne 0），则说明AnQiCMS进程正在运行，此时脚本会使用Englishkill -9 $PIDSend a forceful termination signal to cleanly shut down AnQiCMS service.If the PID does not exist, the script will prompt that AnQiCMS is not running, to avoid unnecessary termination attempts.

It is worth mentioning that AnQiCMS also supports deploying multiple independent AnQiCMS instances on the same server (for example, serving different businesses or testing environments). In this advanced deployment scenario, in order to ensure that each instance's stop script can accurately control its corresponding process, the official documentation recommends the following approach: copying a set of code for each independent AnQiCMS instance and its main program file (anqicmsAn executable file (e.g.) is renamed to a unique name (e.g.,anqicms_site1/anqicms_devetc.). Correspondingly, each instance'sstop.shscript, make sure it points to the correct directory of the AnQiCMS executable file, and that the directory containsBINNAMEVariables will also be modified, pointing to their specific executable file names. In this way, even if multiple AnQiCMS instances are running on the server, each instance's stop script can use its uniqueBINNAMEand as mentioned beforegrepAccurate matching mechanism, ensures that only the process it manages is terminated, without affecting the normal operation of other AnQiCMS instances.

In summary, the AnQiCMS shutdown script combines the powerful functions of Linux command-line tools, utilizes precise word boundary matching and clear naming conventions, and achieves highly accurate identification and termination of target processes. This is crucial for ensuring the stability and operational security of website services.

Frequently Asked Questions

How does AnQiCMS's stop script handle the situation where the AnQiCMS process is not running?

AnQiCMSstop.shBefore attempting to terminate the process, the script will first try tops -ef | grep ... | awk ...Command to check if the PID of the target process exists. If the script detects that the PID does not exist (i.e.exists -eq 0It will output a friendly message indicating that the AnQiCMS process is not currently running, without performing any termination operations, which effectively avoids unnecessary errors or empty operations.

If multiple independent AnQiCMS instances are running on my server, how can I ensure that each instance's stop script terminates its corresponding process accurately?

When you run multiple independent AnQiCMS instances on the same server, **the practice is to copy a set of independent AnQiCMS program files for each instance. The key steps are that you need to place the program files for each instance directory in.anqicmsThe executable file is renamed to a unique name (for example,)anqicms_prod/anqicms_test). Then, modify the scripts inside each instance directory accordingly,stop.shwhich contains the following information:BINNAMEVariable is set to match the new name of the executable file of this instance. This ensures that each instance'sstop.shscript will accurately locate and terminate the specific process that matches the variableBINNAMEto ensure they do not interfere with each other.

If other unrelated application process names happen to include the string 'anqicms', will the AnQiCMS stop script incorrectly terminate them?

AnQiCMSstop.shThe script avoids such misoperations, ingrepcommands using\<and\>the word boundary symbols of these two regular expressions (grep '\<anqicms\>'）。This means it will strictly match "anqicms" as a whole.