Modify hosts file and hostname: easily realize domain name and IP address mapping

LXD is described as the next-generation container and virtual machine manager that offers an immersive for Linux systems running inside containers or as virtual machines. It provides images for an inordinate number of Linux distributions with support

The key steps for creating a self-signed SSL certificate are as follows: 1. Generate the private key, use the command opensslgenrsa-outselfsigned.key2048 to generate a 2048-bit RSA private key file, optional parameter -aes256 to achieve password protection; 2. Create a certificate request (CSR), run opensslreq-new-keyselfsigned.key-outselfsigned.csr and fill in the relevant information, especially the "CommonName" field; 3. Generate the certificate by self-signed, and use opensslx509-req-days365-inselfsigned.csr-signk

Firefox browser is the default browser for most modern Linux distributions such as Ubuntu, Mint, and Fedora. Initially, its performance might be impressive, however, with the passage of time, you might notice that your browser is not as fast and resp

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

Frankly speaking, I cannot recall the last time I used a PC with a CD/DVD drive. This is thanks to the ever-evolving tech industry which has seen optical disks replaced by USB drives and other smaller and compact storage media that offer more storage

Q4OS is a new Linux distribution that’s based on Debian; a common base that’s shared with other distributions like Ubuntu and Linux Mint. It’s aimed at users who just want a simple, stable, easy to use Linux operating system that they can convenientl