PID file in Linux operating system: management process at a glance

This article provides an in-depth analysis of the pid file mechanism of the Linux operating system, introduces its role in the entire system, generation principles, management techniques and other important contents, and lists application cases in actual operating environments.

1.What is a pid file?

"pid" is the abbreviation of process identifier file. Its purpose is to provide a unique identifier record for started tasks. Such files usually have a ".pid" extension in Linux operating systems.

2. The role of pid file:

In the field of facility management and process control, the use of PID (Process IDentifier) ​​files is crucial. It can assist administrators at all levels to effectively track and supervise various processes in the system to prevent the repeated start of any process.

3. How to generate pid file?

In the Linux underlying facilities, the function of application self-management of PID files is enabled. This kind of file, as a key log record, is mainly responsible for recording and storing the process ID (PID) information of the program, and providing necessary support for the use of related programs. Whenever an application is activated to run, its corresponding PID value will automatically be written into a file with a `.pid` extension in the specific path and a payload.

4. Manage pid file:

Managing pid files mainly includes the following aspects:

- Creation and deletion: Applications are responsible for creating and deleting their own pid files.

-Location path analysis: Major systems usually store pid files in fixed locations linux pid files, such as "/var/run" and "/var/tmp".

Follow the following rules: In order to prevent PID file naming disorder, it is recommended to use the unique identification of various applications as the naming benchmark.

-Document control: Access permissions to PID files should be strictly controlled to prevent unauthorized operations.

5. How to use pid file?

pid files can provide a lot of convenience for system management and operation and maintenance work. For example:

-In-depth monitoring of process status: Check the pid file to facilitate managers to fully understand and discover possible process anomalies.

(True) In program control, using PID file technology, system administrators can effectively initiate, terminate and resume specific processes.

-Execute multiple startup prevention measures: by reading the pid file to avoid repeated creation of the same type of process.

6. Notes:

When using pid files, you need to pay attention to the following points:

-Optimize the program termination process to ensure the timely clearing of process pid files and prevent the remains of abandoned data sets.

It is recommended to set up regular checks for program operation to find out whether the pid file exists. If there is any abnormality, please repair it as soon as possible.

Please strictly follow the programmatic regulations on the storage location and format of PID files, and they must be clearly displayed in relevant documents.

7. Sample code:

Here is a sample source code for creating and editing PID file features in the Python development environment.

import os

After creating the pid file, define the following function:

pid = str(os.getpid())

Set the default gateway in linux mode and open the pid file in write mode.

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