When encountering DNS problems, first check the /etc/resolv.conf file to see if the correct nameserver is configured; secondly, you can manually add public DNS such as 8.8.8.8 for testing; then use nslookup and dig commands to verify whether DNS resolution is normal. If these tools are not installed, you can first install the dnsutils or bind-utils package; then check the systemd-resolved service status and configuration file /etc/systemd/resolved.conf, and set DNS and FallbackDNS as needed and restart the service; finally check the network interface status and firewall rules, confirm that port 53 is not

If you find that the server is running slowly or the memory usage is too high, you should check the cause before operating. First, you need to check the system resource usage, use top, htop, free-h, iostat, ss-antp and other commands to check CPU, memory, disk I/O and network connections; secondly, analyze specific process problems, and track the behavior of high-occupancy processes through tools such as ps, jstack, strace; then check logs and monitoring data, view OOM records, exception requests, slow queries and other clues; finally, targeted processing is carried out based on common reasons such as memory leaks, connection pool exhaustion, cache failure storms, and timing task conflicts, optimize code logic, set up a timeout retry mechanism, add current limit fuses, and regularly pressure measurement and evaluation resources.

As a system administrator, you may find yourself (today or in the future) working in an environment where Windows and Linux coexist. It is no secret that some big companies prefer (or have to) run some of their production services in Windows boxes an

In Linux systems, 1. Use ipa or hostname-I command to view private IP; 2. Use curlifconfig.me or curlipinfo.io/ip to obtain public IP; 3. The desktop version can view private IP through system settings, and the browser can access specific websites to view public IP; 4. Common commands can be set as aliases for quick call. These methods are simple and practical, suitable for IP viewing needs in different scenarios.

Built on Chrome’s V8 engine, Node.JS is an open-source, event-driven JavaScript runtime environment crafted for building scalable applications and backend APIs. NodeJS is known for being lightweight and efficient due to its non-blocking I/O model and

Linuxcanrunonmodesthardwarewithspecificminimumrequirements.A1GHzprocessor(x86orx86_64)isneeded,withadual-coreCPUrecommended.RAMshouldbeatleast512MBforcommand-lineuseor2GBfordesktopenvironments.Diskspacerequiresaminimumof5–10GB,though25GBisbetterforad

In this article, we will learn how to install, update, remove, find packages, manage packages and repositories on Linux systems using YUM (Yellowdog Updater Modified) tool developed by RedHat. The example commands shown in this article are practicall

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,