What is the /etc/resolv.conf file used for?
/etc/resolv.conf is a key file used to configure the DNS settings of Unix-like systems. Its core function is to tell the system to use the DNS server to resolve domain names. This file contains entries such as nameserver (specify the DNS server address), search (define the search domain), and options (adjust the resolution behavior such as timeout and retry times). 1. The system reads this file through the resolver library for domain name resolution; 2. Common entries include multiple nameserver, search list and options parameters; 3. The file is usually serviced by systemd-resolved, NetworkManager or dhclient.
Jul 13, 2025 am 12:31 AM
How to turn off notifications on Mac
There are four main ways to turn off notifications on your Mac. 1. Turn off all notifications through "System Settings": Enter the "Notifications" setting, click the top switch to close all notifications with one click, which is suitable for temporary purity. 2. Manage the notification settings of applications one by one: select a specific app in the notification list, turn off its notification permissions or prohibit the display of banners, such as WeChat, email, etc. 3. Use "Concentration Mode" to intelligently filter notifications: Create "Work" and "Sleep" and other modes, set the types of notifications allowed to be received and can be automatically turned on regularly. 4. Tips for quickly switching notification status: Quickly enable Do Not Disturb mode through the Control Center or Siri, suitable for temporary mute needs.
Jul 13, 2025 am 12:26 AM
How to fix Snipping Tool not working in Windows?
If the screenshot tool SnippingTool in Windows cannot be used, you can follow the following steps to troubleshoot: 1. Confirm whether the system version supports it. Some new versions of Windows have been replaced with Snip&Sketch; 2. Restart the Explorer or computer to eliminate temporary stuttering; 3. Run sfc/scannow through the administrator command prompt to repair the system files; 4. Check and install the latest system updates; 5. Consider using Snip&Sketch or third-party screenshot tool instead.
Jul 13, 2025 am 12:22 AM
What is the purpose of the Terraform state file (.tfstate)?
The .tfstate file is the core mechanism for Terraform to manage infrastructure status. It is used for resource status tracking, support incremental changes, realize team collaboration, and needs to be properly backed up. 1. It records resource ID, attributes, dependencies and provider metadata, allowing Terraform to identify created resources; 2. Support incremental deployment to ensure that only the differences are changed rather than repeated creation; 3. Share states through remote backends and enable locking mechanisms to avoid conflicts in team collaboration; 4. Although it is JSON format, it is sensitive runtime data and should not be submitted to the code repository but needs to be backed up regularly.
Jul 13, 2025 am 12:17 AM
What is SSH (Secure Shell) and what port does it use?
SSH (SecureShell) is a protocol used for secure access and management of systems through unsecure networks. It uses 22 ports by default. Its main functions include remote login, secure file transfer, application tunneling and remote task automation. SSH differs from Telnet and FTP in that its communication is encrypted throughout and supports multiple authentication methods, such as password and public key authentication, thereby ensuring data privacy and tamper-proof. 1. Remote login to the server 2. Securely transfer files using SCP or SFTP 3. Forward other applications via encrypted channels 4. Automate tasks on remote machines through scripts. While ports can be changed to reduce automatic attack attempts, the core advantage lies in encryption and security mechanisms.
Jul 13, 2025 am 12:13 AM
What is a namespace in Kubernetes?
Kubernetesnamespacesdivideclusterresourcesfororganizationandisolation.Theyactasvirtualclusterswithinasinglephysicalcluster,separatingresourceslikeservicesandpods,enablingper-namespaceaccesscontrolviaRBAC,andallowingresourcequotastopreventoveruse.Comm
Jul 13, 2025 am 12:07 AM
How to Install PgAdmin on Rocky Linux and AlmaLinux
PgAdmin 4 is an open-source, powerful, and front-end PostgreSQL database administration tool. PgAdmin 4 allows administrators to seamlessly manage PostgreSQL databases from a web browser and run SQL queries among other database tasks. It’s written in
Jul 12, 2025 am 09:32 AM
Contacts App Missing All Contacts on Mac? Here’s the Fix
Some Mac users have noticed that their Contacts app occasionally loses all contact information, leaving the entire address book empty. While this situation is definitely concerning, there's a bright side — in most cases, it’s an easy fix, and your co
Jul 12, 2025 am 09:31 AM
How to Install MongoDB on Rocky Linux and AlmaLinux
MongoDB is a high-performance, highly scalable document-oriented NoSQL database built to manage heavy traffic and vast amounts of data. Unlike traditional SQL databases that store data in rows and columns within tables, MongoDB structures data in a J
Jul 12, 2025 am 09:29 AM
Ubuntu 25.04 'Plucky Puffin”: A Bold Leap Forward with GNOME 48 and HDR Brilliance
Ubuntu has long stood as a bastion of accessibility, polish, and power in the Linux ecosystem. With the arrival of Ubuntu 25.04, codenamed “Plucky Puffin”, Canonical has once again demonstrated its commitment to delivering a
Jul 12, 2025 am 09:28 AM
See Sports Scores in the Mac Menu Bar with MenuScores
For Mac users who are also sports enthusiasts, there’s a handy little free application known as MenuScores. This app displays the game of your choice directly in the menu bar, making it easy to monitor scores or upcoming game times with just a glance
Jul 12, 2025 am 09:27 AM
How to Install Java 16 in Rocky Linux and AlmaLinux
Java is a cross-platform, object-oriented and multi-functional programming language, mainly used to develop mobile applications, network applications and cloud services. In addition, you can also use Java to develop games, chatbots, enterprise-level applications, etc. To develop Java applications, you need to install an IDE (Integrated Development Environment). IntelliJ IDEA is an excellent IDE example designed specifically for Java development. But before that, you must install Java first. This can be provided through OpenJDK or Oracle JDK. [You may also like: 27 models for Lin
Jul 12, 2025 am 09:26 AM
How to Move Files from Mac to External Hard Drive? How to Transfer Them?
How to transfer files from Mac to external hard driveWhen moving files, you physically remove them from their original location. Copying files, meanwhile, preserves the original file location—pasting a second version to
Jul 12, 2025 am 09:25 AM
Secure Apache with Let's Encrypt Certificate on Rocky Linux
In our earlier guide, we provided a step-by-step walkthrough on installing the LAMP stack on Rocky Linux and later moved on to configuring Apache virtual hosts for hosting multiple websites from a single server.However, securing your website is just
Jul 12, 2025 am 09:24 AM
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