🐧 nixCraft → Hardware → How to unlock LUKS using Dropbear SSH keys remotely in Linux On Linux, we encrypt our partitions and entire disk using Linux Unified Key Setup-on-disk-format (LUKS) for security and privacy reasons. We unlock LUKS protected disk by providing a passphrase at boot time. You need to be in front of your computer or use a remote console to open the encrypted disk under Linux at

🐧 nixCraft → Open Source → Command Line Hacks → exa a modern replacement for ls command in rust for Linux/Unix ls is a command to show files in Linux and Unix-like operating systems. A ls command first appeared in a version of AT&T UNIX as well as in Multics. BSD and GNU Coreutils package provides the ls command with minor syntax changes. There is now third alternative named exa. It is a modern r

nixCraft → Cloud Computing → How to boost Linux Internet speed with TCP BBR kernel settings I recently read that TCP BBR has significantly increased throughput and reduced latency for connections on Google’s internal backbone networks and google.com and YouTube Web servers throughput by 4 percent on average globally – and by more than 14 percent in some countries. The TCP BBR patch needs to be app

Nginx is a lightweight, high-performance web server/reverse proxy and e-mail (IMAP/POP3) proxy. It runs on UNIX, GNU/Linux, BSD variants, Mac OS X, Solaris, and Microsoft Windows. According to Netcraft, 13.50% of all domains on the Internet use nginx web server. Nginx is one of a handful of servers written to address the C10K problem. Unlike traditional servers, Nginx doesn’t rely on threads to ha

nixCraft → Howto → CentOS → Find Out If Patch Number ( CVE ) Has Been Applied To RHEL / CentOS Linux I know how to update my system using the yum command. But, how can I find out that patch has been applied to a package? How do I search CVE patch number applied to a package under a Red Hat Enterprise Linux/CentOS/RHEL/Fedora Linux based system? You need to use the rpm command. Each rpm package sto

nixCraft → Tutorials → Iptables → How To Drop or Block Attackers IP Address With Null Routes On a Linux Someone might attack your Linux based system. You can drop attacker IP using IPtables. However, you can use the route or ip command to null route unwanted traffic. A null route (also called as blackhole route) is a network route or kernel routing table entry that goes nowhere. Matching packets a

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nixCraft → Tutorials → FreeBSD → FreeBSD / Linux: Sending a Message to Windows Workstation With smbclient Command You can use a utility called smbclient (part of samba server) to send a message to windows system from FreeBSD or from Linux/Solaris/UNIX OS. This command lets you send messages to windows workstations, display browse lists, and connect to SMB shares. The syntax is as follows to send m