Linux Performance Tuning with `sysctl`
sysctl is used to adjust kernel parameters at runtime to optimize Linux system performance. The answer is to improve the performance of specific workloads by placing network, memory and security-related parameters rationally. 1. Understand the basics of sysctl: Use sysctl to view or set the kernel parameters under /proc/sys, temporarily modify the command such as sudosysctlnet.core.rmem_max=16777216, and permanent modifications require writing to /etc/sysctl.conf or /etc/sysctl.d/ and executing sudosysctl-p to take effect. 2. Network performance tuning: For high traffic scenarios, increase the TCP buffer (such as net.core.rmem_m
Jul 30, 2025 am 01:44 AM
Troubleshooting High CPU Usage in a Linux Environment
Usetop,htop,orpsaux--sort=-%cpu|head-10toidentifyhigh-CPUprocessesbyPID,command,anduser.2.ChecksystemloadwithuptimeandcompareloadaveragetoCPUcorecountusingnproctodetermineifCPUcontentionexists.3.AnalyzeCPUusagetypeswithvmstat15(us,sy,id,wa)andusempst
Jul 30, 2025 am 01:26 AM
A Step-by-Step Guide to Compiling the Linux Kernel from Source
Installrequiredtoolsusingsudoaptinstallbuild-essentiallibncurses-devbisonflexlibssl-devlibelf-dev.2.Downloadkernelsourcefromkernel.orgorviagitclone.3.Copycurrentconfigwithcp/boot/config-$(uname-r).configandrunmakeolddefconfig.4.Optionallycustomizewit
Jul 30, 2025 am 01:26 AM
A Comparison of Linux Desktop Environments: GNOME vs KDE
GNOMEprioritizessimplicityandminimalismwithaclean,opinionatedinterfacecenteredaroundtheActivitiesOverview,whileKDEPlasmaemphasizesflexibilityandcontrol,offeringextensivecustomizationofvisualsandbehavior.2.GNOMEtypicallyuses800MB–1.2GBRAMatidleandhasi
Jul 30, 2025 am 12:56 AM
A Guide to Package Management on Debian-based Linux Systems
The core of Debian-based system software management is APT tools and .deb format, and daily software operations can be efficiently completed using the apt command. 1. You need to run sudoaptupdate to update the software package list; 2. Use sudoaptupgrade to upgrade all software packages, and use sudoaptfull-upgrade to handle dependency conflicts; 3. Use sudoaptinstallpackage-name to install the software, use remove to uninstall the configuration, and use purge to clear the configuration; 4. Use aptsearch and aptshow to search and view the software information respectively; 5. Use sudodpkg-i to install the local .deb file, according to
Jul 30, 2025 am 12:55 AM
Linux for Beginners: From Installation to Command Line Mastery
Chooseabeginner-friendlyLinuxdistributionlikeUbuntu,LinuxMint,orPop!_OS,downloaditsISO,createabootableUSBusingRufusorBalenaEtcher,bootfromit,testinLiveModeifdesired,theninstallbyfollowingthesetupwizardtoselectlanguage,timezone,installationtype,andcre
Jul 30, 2025 am 12:14 AM
The Role of the Linux Kernel in Modern Computing
TheLinuxkernelisthecorecomponentofLinux-basedoperatingsystems,servingasthebridgebetweensoftwareandhardware.Itmanagesprocessscheduling,memoryallocation,devicedrivers,filesystems,andsecuritymechanismsinprivilegedkernelspacetoensuresystemstabilityandsec
Jul 30, 2025 am 12:14 AM
The Ultimate Guide to Choosing a Linux Distribution
TherightLinuxdistrodependsonyourusecase,skilllevel,andneeds:1.Beginnersshouldchooseuser-friendlydistroslikeUbuntuorLinuxMintforeaseofuseandstrongsupport.2.DevelopersandpowerusersmaypreferFedora,openSUSETumbleweed,orArchLinuxforcutting-edgetoolsandcus
Jul 29, 2025 am 02:39 AM
how to copy a file in linux
When copying files using the cp command in Linux system, you need to pay attention to the command format and common parameters. To copy a file, you need to use the basic format cp[option] source file target path; if you need to preserve file properties, add the -a parameter; to prevent overwriting existing files, use the -i option; to display the copy process; if you use the -v parameter; if you do not prompt for forced copying, use the -f parameter; when copying the directory, you must add the -r parameter for recursion.
Jul 29, 2025 am 02:36 AM
How to Set Up a Firewall on Linux with UFW and iptables
UseUFWforsimplefirewallsetupwithcommandslikesudoufwallowsshandsudoufwenableaftersettingdefaultstodenyincomingandallowoutgoingtraffic.2.Useiptablesforadvancedcontrolbysettingpolicieswithsudoiptables-PINPUTDROP,allowingloopbackandestablishedconnections
Jul 29, 2025 am 02:28 AM
Understanding the Linux Boot Process from BIOS to Shell
BIOS/UEFIperformsPOST,selectsbootdevice,andloadsbootloader—BIOSreadsMBRwhileUEFIusesEFISystemPartition.2.Bootloader(GRUB)loadskernelandinitramfsintomemory,allowingkernelselectionorparametereditingbeforeexecution.3.Kernelinitializeshardware,mountsinit
Jul 29, 2025 am 02:24 AM
A Guide to AppArmor for Linux Application Security
AppArmorisaLinuxsecuritymodulethatrestrictsapplicationprivilegestoenhancesystemsecurity.1.Itenforcesmandatoryaccesscontrolsviasecurityprofilesthatdefinepermittedfile,directory,network,andsystemcallaccess.2.Profilesoperateinenforcemode(blockingviolati
Jul 29, 2025 am 02:17 AM
How to Use `sed` and `awk` for Text Processing in Linux
sed and awk are powerful text processing tools in Linux, suitable for efficient text operations under the command line, for log parsing, configuration file editing, and data conversion. 1.sed is used for stream editing, and can perform text replacement (such as s/old/new/replacement for the first time, s/old/new/g global replacement), operate on specific lines (such as 3s/old/new/only line 3, 2,5s/old/new/g lines 2 to 5), delete lines (/^$/d delete empty lines, /error/d delete lines containing error), insert or append text (/start/i\Newlinebefore insert before the match, /end/a\Newlineafter after the match
Jul 29, 2025 am 01:59 AM
A Guide to Setting Up a Mail Server on Linux
First, make sure that the DNS is configured correctly, then install and configure Postfix, Dovecot, MariaDB, SpamAssassin and ClamAV in turn, 1. Set the system host name and DNS record; 2. Install Postfix and configure virtual user support; 3. Install Dovecot and set mail storage and SSL; 4. Deploy SpamAssassin and ClamAV to achieve spam and virus filtering; 5. Test SMTP/IMAP services and continuously monitor logs, and finally ensure that the mail server runs safely and stably by correctly configuring TLS and authentication mechanisms.
Jul 29, 2025 am 01:57 AM
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