106. Question: To temporarily save iptables rules, the command used is iptables-save > ____. Option 1: rules.txt Option 2: config.rules Option 3: iptables.conf Option 4: saved-rules Correct Answer: 1 Explanation: To temporarily save iptables rules, the command iptables-save > rules.txt is used. This command saves the current firewall rules to a file named “rules.txt” for … Read more
Ansible is an automation tool for operations management based on Python. Ansible is an automation tool developed in Python that communicates with remote hosts using the SSH protocol, eliminating the need to install clients or agents on the managed end. Its core functionalities include batch system configuration, program deployment, command execution, and multi-task orchestration, supporting … Read more
🔐 Say Goodbye to Complicated Passwords! A Complete Guide to Passwordless Login on Linux to Double Your Operations Efficiency Do you have to enter a password every time you SSH login? As a qualified operations engineer, how can you tolerate such repetitive work! Today, I will teach you a trick to completely break free from … Read more
Linux Cloud Computing | Daily Practice | Practical Tools | Career Development 💥 “Manually SSH logging into 100 servers to change configurations, working overtime until dawn and still missing some?” “Inconsistent environments across different machines, crashing upon deployment?” “Mistyping commands during late-night deployments and being held accountable?” These operational “nightmare scenarios” are essentially due to … Read more
1. Batch Configuration of SSH Passwordless Login The prerequisite for this operation is to generate a public key on the management machine: # Execute on the management machine (the machine with Ansible installed) to generate RSA key pairssh-keygen -t rsa -b 2048 -f ~/.ssh/id_rsa Add IP addresses and passwords in the relevant files: Modify the … Read more
First, let me ask a question: How can we check what Name Server records a domain has? Linux provides a number of network-related commands. Since these network commands are quite scattered, I have organized the commonly used network commands from the following perspectives: Remote operations; Check local network status; Network testing; DNS queries; HTTP. This … Read more
Many friends have probably experienced OpenWrt, right? Have you felt its powerful and outrageous features due to its open-source and customizable nature while building your own “super router”? However, with the freedom that open-source brings, users also need to take on more security responsibilities. In this series, we will discuss the security hardening of OpenWrt, … Read more
First, my system is Ubuntu 24.04 LTS, operated as the root user;The first step is to install, then check the version, followed by generating keys and verifying; the commands in the screenshot can be typed manually, do not copy directly at the beginning;Next, a small script is used to distribute keys in bulk; the first … Read more
1. Set Time Zone Right-click on the time -> Properties -> Select a city in the East Eight Time Zone (Singapore) 2. Modify Username or Hostname Display // Modify ~/.zshrc file vim ~/.zshrc // Change emoji to @ 3. Set Up SSH Passwordless Login // Generate key pair // Public key (id_rsa.pub) and private key … Read more
Note: This article is an original work by Liu Feng from Anyatech. Please respect intellectual property rights. When sharing, please indicate the source. No plagiarism, adaptation, or unauthorized reproduction is accepted. Introduction In daily Linux system management and Oracle RAC cluster deployment, SSH serves as both a “secure remote gateway” and an efficient “bridge” for … Read more