search

Will Linux user memory be limited?

Mar 13, 2023 am 10:59 AM
linuxMemory

Linux user memory is limited. The method of limiting user memory in Linux is: 1. Enter the file through the "sudo vim /etc/security/limits.conf" command; 2. Use "@test hard rss 21000000 "The command limits the memory usage of a user's test to no more than about 20G.

Will Linux user memory be limited?

#The operating environment of this tutorial: linux5.9.8 system, Dell G3 computer.

Will Linux user memory be limited?

meeting.

Linux limits users’ disk space and memory usage

1. How to limit users’ disk space

1. View the disks of all users in the system Space quota

sudo repquota /dev/vda1

2. Check the disk space quota of a certain user

sudo edquota user_name

If you want to change the disk space quota of the user, directly modify the soft and hard behind the blocks field in the pop-up file. The value of the field is enough. For example, in the figure below, the value of the soft field is set to 2097152 (that is, 2G), and the value of the hard field is set to 3145728 (that is, 3G). This setting means that the system will allow you to set the time within a certain period of time (time setting (See Section 4 below) the disk space exceeds 2G, but you must reduce the disk space to less than 2G before the deadline; but in any case, your disk space cannot exceed 3G. This is what soft and hard mean. It should be noted that the blocks and inodes fields do not need to be set. The values ​​of these two fields are automatically given by the system.

Will Linux user memory be limited?

#3. First set the disk space quota of a template user fanyiwei, and then assign its quota to the target user target_user_name. As long as you set the template quota once, this command will be the most commonly used in the future, which is very convenient.

sudo edquota -p fanyiwei target_user_name

4. Set the warning period

In the previous section 2, we set the soft upper limit (soft) and hard upper limit (hard) of the user's disk space. The hard upper limit is an upper limit that is absolutely not allowed to be exceeded, such as the 3G set above; the soft upper limit allows you to exceed the limit in a short period of time, but there is a deadline, which is the warning period. The default setting of the warning period is 7 days, but you can use the following command to modify it

sudo edquota -t

After running, the following file will pop up, and then just modify it. For example, the picture below sets the warning period to 3 days.

Will Linux user memory be limited?

2. How to limit the user’s memory usage

1. First use the following command to enter the file

sudo vim /etc/security/limits.conf

After entering, if you want To limit the memory usage of each user to no more than about 20G, add the following statement at the bottom

* hard rss 21000000

Will Linux user memory be limited?

If you want to limit the memory usage of a certain user test It cannot exceed about 20G, you can add the command

@test hard rss 21000000

Will Linux user memory be limited?

in the figure below to explain. The four fields we wrote above mean: (1) Add * No. means it will work for all users, adding @test means it will only work for a user named test. (2) hard means a hard upper limit. You can also change it to soft, which is a soft upper limit. (3) RSS indicates that we are limiting the memory usage. (4) 21000000 (unit KB) indicates that the amount we limit is approximately 20GB.

2. After modifying the above file and saving it, we use the following command

sudo vim /etc/pam.d/login

to enter the file, add the following sentence at the bottom, and then save it.

session required /lib/security/pam_limits.so

Will Linux user memory be limited?

3. Log out of the account and log in again. Use the following command to view the memory quota

ulimit -a

The result is as shown below

Will Linux user memory be limited?

The above picture shows that we have successfully set the user's memory usage to 20G.

Related recommendations: "Linux Video Tutorial"

The above is the detailed content of Will Linux user memory be limited?. For more information, please follow other related articles on the PHP Chinese website!

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
The 5 Core Components of the Linux Operating SystemThe 5 Core Components of the Linux Operating SystemMay 08, 2025 am 12:08 AM

The five core components of the Linux operating system are: 1. Kernel, 2. System libraries, 3. System tools, 4. System services, 5. File system. These components work together to ensure the stable and efficient operation of the system, and together form a powerful and flexible operating system.

The 5 Essential Elements of Linux: ExplainedThe 5 Essential Elements of Linux: ExplainedMay 07, 2025 am 12:14 AM

The five core elements of Linux are: 1. Kernel, 2. Command line interface, 3. File system, 4. Package management, 5. Community and open source. Together, these elements define the nature and functionality of Linux.

Linux Operations: Security and User ManagementLinux Operations: Security and User ManagementMay 06, 2025 am 12:04 AM

Linux user management and security can be achieved through the following steps: 1. Create users and groups, using commands such as sudouseradd-m-gdevelopers-s/bin/bashjohn. 2. Bulkly create users and set password policies, using the for loop and chpasswd commands. 3. Check and fix common errors, home directory and shell settings. 4. Implement best practices such as strong cryptographic policies, regular audits and the principle of minimum authority. 5. Optimize performance, use sudo and adjust PAM module configuration. Through these methods, users can be effectively managed and system security can be improved.

Linux Operations: File System, Processes, and MoreLinux Operations: File System, Processes, and MoreMay 05, 2025 am 12:16 AM

The core operations of Linux file system and process management include file system management and process control. 1) File system operations include creating, deleting, copying and moving files or directories, using commands such as mkdir, rmdir, cp and mv. 2) Process management involves starting, monitoring and killing processes, using commands such as ./my_script.sh&, top and kill.

Linux Operations: Shell Scripting and AutomationLinux Operations: Shell Scripting and AutomationMay 04, 2025 am 12:15 AM

Shell scripts are powerful tools for automated execution of commands in Linux systems. 1) The shell script executes commands line by line through the interpreter to process variable substitution and conditional judgment. 2) The basic usage includes backup operations, such as using the tar command to back up the directory. 3) Advanced usage involves the use of functions and case statements to manage services. 4) Debugging skills include using set-x to enable debugging mode and set-e to exit when the command fails. 5) Performance optimization is recommended to avoid subshells, use arrays and optimization loops.

Linux Operations: Understanding the Core FunctionalityLinux Operations: Understanding the Core FunctionalityMay 03, 2025 am 12:09 AM

Linux is a Unix-based multi-user, multi-tasking operating system that emphasizes simplicity, modularity and openness. Its core functions include: file system: organized in a tree structure, supports multiple file systems such as ext4, XFS, Btrfs, and use df-T to view file system types. Process management: View the process through the ps command, manage the process using PID, involving priority settings and signal processing. Network configuration: Flexible setting of IP addresses and managing network services, and use sudoipaddradd to configure IP. These features are applied in real-life operations through basic commands and advanced script automation, improving efficiency and reducing errors.

Linux: Entering and Exiting Maintenance ModeLinux: Entering and Exiting Maintenance ModeMay 02, 2025 am 12:01 AM

The methods to enter Linux maintenance mode include: 1. Edit the GRUB configuration file, add "single" or "1" parameters and update the GRUB configuration; 2. Edit the startup parameters in the GRUB menu, add "single" or "1". Exit maintenance mode only requires restarting the system. With these steps, you can quickly enter maintenance mode when needed and exit safely, ensuring system stability and security.

Understanding Linux: The Core Components DefinedUnderstanding Linux: The Core Components DefinedMay 01, 2025 am 12:19 AM

The core components of Linux include kernel, shell, file system, process management and memory management. 1) Kernel management system resources, 2) shell provides user interaction interface, 3) file system supports multiple formats, 4) Process management is implemented through system calls such as fork, and 5) memory management uses virtual memory technology.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

ZendStudio 13.5.1 Mac

ZendStudio 13.5.1 Mac

Powerful PHP integrated development environment

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

Dreamweaver Mac version

Dreamweaver Mac version

Visual web development tools

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use