Linux Iptables: How to block or open mail server / SMTP protocol
SMTP is used to send mail. Sendmail, Qmail, Postfix, Exim etc all are used on Linux as mail server. Mail server uses the TCP port 25. Following two iptable rule allows incoming SMTP request on port 25...
View ArticleTentakel to execute commands on multiple Linux or UNIX Servers
This is Part II in a series on Execute Commands on Multiple Linux or UNIX Servers Simultaneously. The full series is Part I, Part II, and Part III. Many times, you want to execute a command not only on...
View ArticlePostfix mail server limit the mailbox size
So how do you limit the mailbox size for users configured with the Postfix mail server? It is good choice to avoid problem (disk DoS) by limiting mailbox size. This will avoid the user or hacker to eat...
View ArticlenixCraft FAQ Roundup Oct 29, 2008
Couple of quick question answered by me: => Host a domain without CPanel or Plesk Control Panel => Bash shell display only hidden (dot) files => Monitor Linux user activity in real time =>...
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Linux Postfix SMTP (Mail Server) SSL Certificate Installations and Configuration
In this tutorial yo0u will learn about Installing SSL Certificate (Secure Server Certificate) to secure communication between Postfix SMTP server and mail client such as Outlook or Thunderbird.
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Postfix Mail Server Security Update [moderate security impact]
Postfix MTA updated to fix security vulnerabilities such as incorrectly checks the ownership of a mailbox. In some configurations, this allows for appending data to arbitrary files as root. This...
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How To Tail (View) Multiple Files on UNIX / Linux Console
tail is one of the best tool to view log files in a real time (tail -f /path/to/log.file). The program MultiTail lets you view one or multiple files like the original tail program. The difference is...
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A cautionary tale about locking Linux & FreeBSD user accounts
Like every other solo developer and sysadmin, I do stuff using ssh. Some stuff is automated using scripts, and others require ssh login. For example, one of my scripts logs into my Linux and FreeBSD...
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How to protect Linux against rogue USB devices using USBGuard
usbgurd You deployed a perfect firewall and other network security policies preventing unauthorized access to the user's desktop computer over a network. However, you still need to block USB device...
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DNS settings to avoid email spoofing and phishing for unused domain
As you may know, email spoofing allows attackers to pose as someone else to gain illegal profit. For example, I only use webmaster@cyberciti.biz for communication, but someone might create a...
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How To Set Up SSH Keys With YubiKey as two-factor authentication (U2F/FIDO2)
Patreon users download the PDF version. All Linux and Unix servers are managed manually or by automation tools such as Ansible using ssh. For example, say you have a server at Linode or AWS. Then you...
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How to skip ChatGPT from WireGuard or OpenVPN on Linux
nixCraft Patreon supporters can download the PDF version here. ChatGPT (short for Chat Generative Pre-trained Transformer) is a chatbot by OpenAI. It provides answers to your queries using learning...
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nvtop – Awesome Linux task monitor for NVIDIA, AMD & Intel GPUs
Love this? sudo share_on: Twitter - Facebook - LinkedIn - Whatsapp - Reddit The post nvtop – Awesome Linux task monitor for NVIDIA, AMD & Intel GPUs appeared first on nixCraft.
View ArticleHow to upgrade FreeBSD 13.1 to 13.2 release
The FreeBSD Release Engineering Team is announcing the availability of FreeBSD version 13.2-RELEASE on 11/April/2023. It is the third release of the stable/13 branches. I updated my FreeBSD version...
View ArticleSetting up VSCode for Ansible Lightspeed AI in Ubuntu 22.04 desktop
Red Hat launched the Ansible Lightspeed Code Assistant Generative AI with IBM Watson Code Assistant in May 2023. This preview is now available to all Ansible users, allowing them to explore the...
View ArticleDebian Linux 12.1 released with Security Updates
Debian Linux project announces the first update of the Debian project's stable distribution, Debian 12 (codename "bookworm") named Debian 12.1. This update mainly addresses security issues and...
View ArticleHow to block AI Crawler Bots using robots.txt file
Are you a content creator or a blog author who generates unique, high-quality content for a living? Have you noticed that generative AI platforms like OpenAI or CCBot use your content to train their...
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