How to check disk space in Linux
Check disk space in Linux system. 1. Use the df command to view the overall disk usage. Add the -h parameter to make the output easier to read. You can also specify the mount point to view a specific file system. 2. Use the du command to view the specific directory or file space. The -s parameter is used for summary statistics, and combined with sort, you can sort to view the largest file; 3. Graphical tools such as GNOME's baobab provide intuitive visual analysis, suitable for users who are not used to the command line. Mastering these methods can efficiently manage disk space in different scenarios.
Jul 13, 2025 am 12:58 AM
What does the netstat command show?
The netstat command can be used to check network connections, routing tables, interface statistics, etc. 1. Use netstat-tuln to view TCP and UDP connections in the monitored state to help identify which services are receiving connections; 2. Use netstat-r to view the kernel routing table to troubleshoot connection problems; 3. Use netstat-i to monitor the statistical information of the network interface, such as packet loss; 4. Use grep, watch and other tools to enhance functions, but modern systems recommend using ss instead of netstat.
Jul 13, 2025 am 12:43 AM
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
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
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
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
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
How to Configure Apache Virtual Hosts on Rocky Linux
This step is entirely optional and only applies to those looking to run multiple websites from a single server. Up to now, our LAMP configuration supports just one site. To host more than one website, you must create or adjust virtual host files. Apa
Jul 12, 2025 am 09:23 AM
How to Install MySQL 8.0 on Rocky Linux and AlmaLinux
Written in C, MySQL is an open-source, cross-platform, and one of the most widely used Relational Database Management Systems (RDMS). It’s an integral part of the LAMP stack and is a popular database management system in web hosting, data analytics,
Jul 12, 2025 am 09:21 AM
The Best RedHat-based Linux Distributions
Red Hat Enterprise Linux is a hugely popular enterprise-level operating system that supports a diverse range of open-source technologies such as Ansible automation, Hybrid Cloud, virtualization, and containerization. In this guide, we highlight some
Jul 12, 2025 am 09:18 AM
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