What are Docker volumes and when should you use them?
DockerVolume is a data storage method that is independent of the container life cycle, which is used to persist, share data, or make data exist independently of the container. 1. When you need to persist application data, if you run a database container, you can mount the data directory as a volume, and the data will still be retained even if the container deletes the data; 2. When you need to share data between multiple containers, such as the web application and log processing container sharing the log directory, it can be implemented through volume; 3. When you want to update the code during development, you can also use named volume to simulate behavior similar to bindmount. It can be used through dockervolumels, dockervolumeinspect and dockervolumerm.
Jul 15, 2025 am 12:54 AM
How to check if a specific service is running and enabled on boot?
1. Use systemctl to check the service status and boot up; 2. Check the old system to use SysVinit; 3. Check the service status and boot up on macOS; 4. Check the service status and boot up on Windows through Task Manager or PowerShell. To confirm whether a service is running and set to boot, you can implement it through the corresponding commands of different systems: systemd system uses systemctlstatus and systemctlis-enabled to view the service status and boot status; old SysVinit system checks the status through service or /etc/init.d/ scripts, and chkconfig checks the startup items; macO
Jul 15, 2025 am 12:45 AM
How to Use Port Knocking To Secure SSH Service in Linux
Port Knocking is a nifty technique of controlling access to a port by only allowing legitimate users access to the service running on a server. It works in such a way that when the right sequence of connection attempts is made, the firewall gladly op
Jul 14, 2025 am 09:20 AM
How to Migrate from CentOS to Oracle Linux
With the shift in focus from the CentOS project to CentOS Stream, which will now serve as the upstream for RHEL, several CentOS alternatives have been proposed to replace CentOS 8.For a long time, CentOS has been widely adopted by small businesses an
Jul 14, 2025 am 09:19 AM
How to Migrate from CentOS 8 to Rocky Linux 8
Rocky Linux 8.5, nicknamed Green Obsidian, is officially available! It was launched on November 12, 2021—just six months after the release of Rocky Linux 8.4, which was the fourth stable version in the series.This marks the first fully stable and pro
Jul 14, 2025 am 09:17 AM
Best Arch Linux Based User Friendly Distributions
If you're a dedicated Linux user, you're likely already aware that Linux isn't always the easiest operating system to handle, especially for newcomers. The chances of running into problems during installation or struggling with the learning curve in
Jul 14, 2025 am 09:13 AM
How to Test Your Internet Speed Bidirectionally from Command Line Using 'Speedtest-CLI' Tool
We always need to check the speed of the Internet connection at home and office. What do we do about this? Go to websites like Speedtest.net and begin the test. It loads JavaScript in the web browser and then selects the best server based upon ping a
Jul 14, 2025 am 09:12 AM
Rocky Linux 8.5 Released – Download DVD ISO Images
Ever since RedHat discontinued the CentOS project, the open-source community has worked relentlessly to develop strong replacements for CentOS 8, known for its stability, reliability, and all the benefits inherited from RHEL. Their hard work has prod
Jul 14, 2025 am 09:11 AM
Deepin 15: A Beautifully Crafted Linux Distribution for Everyone
Deepin OS represents a significant evolution in Linux distributions. Let me clarify—I might have exaggerated slightly with "revolutionary," but honestly, it's been a while since I've encountered a Linux distro that truly impressed me.Specif
Jul 14, 2025 am 09:10 AM
How to Install Rocky Linux 8.5 Step by Step
CentOS 8 is reaching EOL (End Of Life) by the end of this year, 2021, and a few Linux distributions have been floated as formidable CentOS alternatives. Among them is Rocky Linux, which is a fork of CentOS and 100% binary compatible with RHEL. In a p
Jul 14, 2025 am 09:08 AM
Linux Mint 17.3 Rosa - Cinnamon Installation, Review and Customization
Linux Mint is arguably one of the easiest and most user-friendly Linux-based operating systems to come by in the Linux world, and while it might be second to Ubuntu in popularity, it remains the favorite of a large majority of Linux users around the
Jul 14, 2025 am 09:07 AM
What is the purpose of the source or . command?
Thesourcecommand(or.)executesascriptinthecurrentshell,makingchangeslikevariablesorfunctionspersist.1.Usesourcetoapplyenvironmentchangesimmediatelywithoutrestartingtheshell,suchasafterediting.bashrc.2.Itensuresvariables,aliases,andfunctionsdefinedinas
Jul 14, 2025 am 02:01 AM
What are cgroups (control groups)?
The core role of cgroups is to limit, control and monitor the resource usage of process groups. It realizes refined management of CPU, memory, disk I/O and other resources by grouping processes and setting resource upper limits or priorities. 1. Resource limit: Set the maximum resource usage of the process group; 2. Priority allocation: Give different resource access priority to different processes; 3. Resource statistics: Provide monitoring data for resource usage; 4. Task control: Support freezing, restoring and migrating process group tasks. In container technologies, such as Docker and Kubernetes, cgroups are used to ensure resource isolation and reasonable allocation between containers. Can be set through dockerrun parameters or Kubernetes resource configuration
Jul 14, 2025 am 01:54 AM
How to get detailed information about the CPU with lscpu?
TogetCPUdetailswithlscpu,runthecommandintheterminal.Itdisplaysarchitecture,CPU(s),corecount,threads,cache,andmore.UsefulfieldsincludeArchitecture,CPU(s),Thread(s)percore,Core(s)persocket,andModelname.Forspecificinfo,useflagslike--list,--extended,or--
Jul 14, 2025 am 01:45 AM
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