GameGamer43 + linux   611

Intercepting and Emulating Linux System Calls with Ptrace « null program
The ptrace(2) (“process trace”) system call is usually associated with debugging. It’s the primary mechanism through which native debuggers monitor debuggees on unix-like systems. It’s also the usual approach for implementing strace — system call trace. With Ptrace, tracers can pause tracees, inspect and set registers and memory, monitor system calls, or even intercept system calls.
linux  Linux_Development 
7 weeks ago by GameGamer43
Progress - A Tiny Tool to Monitor Progress for (cp, mv, dd, tar, etc.) Commands in Linux
Progress, formerly known as Coreutils Viewer, is a light C command that searches for coreutils basic commands such as cp, mv, tar, dd, gzip/gunzip, cat, grep etc currently being executed on the system and shows the percentage of data copied, it only runs on Linux and Mac OS X operating systems.
Linux_Cli  linux  Linux_Applications 
11 weeks ago by GameGamer43
The SO_REUSEPORT socket option []
One of the features merged in the 3.9 development cycle was TCP and UDP support for the SO_REUSEPORT socket option; that support was implemented in a series of patches by Tom Herbert. The new socket option allows multiple sockets on the same host to bind to the same port, and is intended to improve the performance of multithreaded network server applications running on top of multicore systems.  linux  Linux_Development 
may 2018 by GameGamer43
Inside the Linux boot process
In the early days, bootstrapping a computer meant feeding a paper tape containing a boot program or manually loading a boot program using the front panel address/data/control switches. Today's computers are equipped with facilities to simplify the boot process, but that doesn't necessarily make it simple.
IBM  IBM_developerWorks  linux 
may 2018 by GameGamer43
Audit your systems for security compliance with OpenSCAP - Luc de Louw's Blog
SCAP stands for Security Content Automation Protocol. It is an open standard which defines methods for security policy compliance, vulnerability management and measurement etc. This article focuses on the operating system compliance part of SCAP.
OpenSCAP  Linux_Security  linux  Linux_Applications  Linux_Cli  CentOS  RedHat_Linux 
april 2018 by GameGamer43
Why I usually run 'w' first when troubleshooting unknown machines
What's the first command you run upon jumping on a wayward Linux box to try to troubleshoot something? For me, it's almost always "w". Unless I have data pointing me in some other direction before landing on the system, I like to see that as a sort of "first snapshot" of what the box is up to before I go off and possibly do other things.
linux  sysadmins  Linux_Debugging  Linux_Development  DevOps 
march 2018 by GameGamer43
ZFS for Linux | Linux Journal
ZFS remains one of the most technically advanced and feature-complete filesystems since it appeared in October 2005. Code for Sun's original Zettabyte File System was released under the CDDL open-source license, and it has since become a standard component of FreeBSD and slowly migrated to various BSD brethren, while maintaining a strong hold over the descendants of OpenSolaris, including OpenIndiana and SmartOS.
ZFS  linux  Linux_Journal 
march 2018 by GameGamer43
Creating Systemd Service Files | DevDungeon
systemd is used in many mainstream Linux distributions like Arch Linux, CentOS, Debian/Ubuntu, RedHat/Fedora, openSuse, Slackware, CoreOS and more. It provides an easy way to manage and control services and a simple method of creating your own services. This will cover the process of creating and managing your own custom service.
Systemd  linux  Linux_Development 
february 2018 by GameGamer43
Get the History of an Installed Package with DNF – Thomas Stringer – Medium
DNF (“DaNdiFied Yum”) is the next version of Yum, the package manager for RPM-based Linux distributions (RHEL, CentOS, and Fedora). For those of us that are Fedora users, DNF is probably nothing new.
CentOS  FedoraProject  Fedora  RedHat_Linux  Linux  Linux_Development 
february 2018 by GameGamer43
Ten Things I Wish I’d Known About bash – zwischenzugs
Recently I wanted to deepen my understanding of bash by researching as much of it as possible. Because I felt bash is an often-used (and under-understood) technology, I ended up writing a book on it.
bash  linux  linux_development  linux_debugging 
january 2018 by GameGamer43
Error Reporting from your Systemd Automation
I’ve been using Linux for a bit more than 5 years now. One of the things that I’ve come to love about it is how easy it is to automate repetitive tasks. For example, in a previous post, I wrote about a system that I set up for syncing files between my computers. I’d decided that I wanted to take more direct control over my files than other cloud syncing software was letting me, and I was already using Git extensively to version control projects. This lead me to the idea that I could use Git to sync my notes between computers.
Systemd  Linux  Linux_Development  Linux_Debugging 
november 2017 by GameGamer43
How To Use FPM To Easily Create Packages in Multiple Formats | DigitalOcean
The packaging formats used by different distributions of Linux can be a pain point for software developers wishing to release their projects in an easily consumable way. Debian and Ubuntu rely on .deb packages, while Fedora and RedHat both use .rpm style packaging systems. These are incompatible and the tools needed to create them can be rather difficult to work with for those unfamiliar with the eccentricities of each.
FPM  Linux  Linux_Development  RPM  RPMbuild  DigitalOcean_Community 
october 2017 by GameGamer43
Why kernel development still uses email []
In a world full of fancy development tools and sites, the kernel project's dependence on email and mailing lists can seem quaintly dated, if not positively prehistoric. But, as Greg Kroah-Hartman pointed out in a Kernel Recipes talk titled "Patches carved into stone tablets", there are some good reasons for the kernel community's choices. Rather than being a holdover from an older era, email remains the best way to manage a project as large as the kernel.
Linux  Linux_Development  Linux_Kernel 
october 2017 by GameGamer43
How to use Fio (Flexible I/O Tester) to Measure Disk Performance in Linux | DotLayer
Fio which stands for Flexible I/O Tester is a free and open source disk I/O tool used both for benchmark and stress/hardware verification developed by Jens Axboe.
GitHub_Repos  Linux  Linux_Development  Linux_Debugging 
september 2017 by GameGamer43
Playing with kernel TLS in Linux 4.13 and Go
Linux 4.13 introduces support for nothing less than... TLS!

The 1600 LoC patch allows userspace to pass the kernel the encryption keys for an established connection, making encryption happen transparently inside the kernel.
Linux  Linux_Development  Filippo_Valsorda  Linux_Kernel 
september 2017 by GameGamer43
Solaris to Linux Migration 2017
Many people have contacted me recently about switching from Solaris (or illumos) to Linux, especially since most of the Solaris kernel team were let go this year (including my former colleagues, I'm sorry to hear). This includes many great engineers who I'm sure will excel in whatever they choose to work on next. They have been asking me about Linux because I've worked for years on each platform: Solaris, illumos, and Linux, in all cases full time and as a subject matter expert. I've also done some work on BSD, which is another compelling choice, but I'll discuss that another time. The following is my opinion and not an official guide to any OS.
Solaris  Linux  Brendan_Gregg 
september 2017 by GameGamer43
Chapter 9. Managing Services with systemd
Systemd is a system and service manager for Linux operating systems. It is designed to be backwards compatible with SysV init scripts, and provides a number of features such as parallel startup of system services at boot time, on-demand activation of daemons, support for system state snapshots, or dependency-based service control logic. In Red Hat Enterprise Linux 7, systemd replaces Upstart as the default init system.
Systemd  RedHat  RedHat_Linux  CentOS  CentOS7  Linux  Linux_Development 
september 2017 by GameGamer43
Repology analyzes a lot of package repositories and other sources* comparing packages versions across them and gathering other information. Repology shows you in which repositories a given project is packaged, which version is the latest and which needs updating, who maintains the package, and other related information. Repology might be useful
Linux  Linux_Development 
august 2017 by GameGamer43
Enhancing smart backups with Duply - Fedora Magazine
Welcome to Part 2 in a series on taking smart backups with duplicity. This article builds on the basics of duplicity with a tool called duply.  Linux  Linux_Development  Backup_Software 
july 2017 by GameGamer43
Linux eBPF Tracing Tools
This page shows examples of performance analysis tools using enhancements to BPF (Berkeley Packet Filter) which were added to the Linux 4.x series kernels, allowing BPF to do much more than just filtering packets. These enhancements allow custom analysis programs to be executed on Linux dynamic tracing, static tracing, and profiling events.
BPF  Brendan_Gregg  Linux  Linux_Development  Linux_Debugging 
june 2017 by GameGamer43
CPU Utilization is Wrong
The metric we all use for CPU utilization is deeply misleading, and getting worse every year. What is CPU utilization? How busy your processors are? No, that's not what it measures. Yes, I'm talking about the "%CPU" metric used everywhere, by everyone. In every performance monitoring product. In top(1).
Linux  Brendan_Gregg  CPU  Computers  Linux_Development  Linux_Debugging 
may 2017 by GameGamer43
Managing Linux Logs -Ultimate Guide to Logging
A key best practice for logging is to centralize or aggregate your logs in one place, especially if you have multiple servers or tiers in your architecture. We’ll tell you why this is a good idea and give tips on how to do it easily.
Logging  Linux 
may 2017 by GameGamer43
BPF and XDP Reference Guide — Cilium v0.8 documentation
BPF is a highly flexible and efficient “virtual machine”-like construct in the Linux kernel allowing to execute bytecode at various hook points in a safe manner. It is used in a number of Linux kernel subsystems, most prominently networking, tracing and security (f.e. sandboxing).
BPF  Linux_Networking  Linux  Linux_Development  Linux_Debugging  from twitter_favs
april 2017 by GameGamer43
networking:netem [Linux Foundation Wiki]
netem provides Network Emulation functionality for testing protocols by emulating the properties of wide area networks. The current version emulates variable delay, loss, duplication and re-ordering.
Linux  Linux_Development  Linux_Debugging  TheLinuxFoundation  Networking  Linux_Networking 
april 2017 by GameGamer43
Cutting Linux down to size
New tools like musl, toybox, and Clang are offering new techniques for shrinking the Linux kernel, file-system, and user space for IoT.
Linux  Linux_Development 
april 2017 by GameGamer43
Linux Advanced Routing & Traffic Control HOWTO
Linux has very advanced Routing, filtering and traffic shaping options. This site attempts to document how to configure and use these features.
Linux  Linux_Development  Linux_Debugging 
april 2017 by GameGamer43
How to check your Linux servers for rootkits and malware - TechRepublic
Linux is a reliable, secure choice for your data center. Even so, doing regular checks for rootkits and malware is always an advised best practice. Jack Wallen shows you how.
Linux  Linux_Development  Linux_Debugging  Linux_Security  TechRepublic 
april 2017 by GameGamer43
Check listening ports with netstat
If you’re troubleshooting a service that you know is running normally the next step is to ensure it’s listening on the correct network port.
Netstat  Rackspace_Support  Linux  Linux_Development  Linux_Debugging 
april 2017 by GameGamer43
The Cult of DD
You’ll often see instructions for creating and using disk images on Unix systems making use of the dd command. This is a strange program of obscure provenance that somehow, still manages to survive in the 21st century.
linux  Linux_Applications  Linux_Development 
march 2017 by GameGamer43
How to Switch Between Linux Distros Without Losing your Data - Make Tech Easier
Switching between Linux distributions can be hard when you’re preserving user data. Many users have ways to combat this: cloud storage solutions, external hard drives, flash drives, home servers, etc. However, none come close to just giving the home directory its own isolated space so that it is safe from being wiped away.
Linux  Linux_Development 
march 2017 by GameGamer43
Linux cheat sheet: 16 Linux server monitoring commands you really need to know
If you want to know what's going on with your Linux server, start with these Linux monitoring commands.
Linux  Linux_Debugging  Linux_Development  Hewlett_Packard_Enterprise  Hewlett_Packard 
march 2017 by GameGamer43
Rescuing a broken system using only Bash commands
You were experimenting with something on a remotely-accessed server as root, and suddenly you typed the wrong command and nuked the system, or broke it in such a horrible way that normal programs like cp, mv, ls, etc., don't work anymore. However, most of your filesystem is still intact, and you figure that if you could only transfer a rescue utility to the machine (such as a statically-linked version of busybox, which would still run even if you hosed your system libraries or broke your dynamic linker), you could still salvage the system without having to reinstall it from scratch.
Linux  Linux_Development  Bash 
february 2017 by GameGamer43
Adventures in /usr/bin and the likes - Dormammu's Blog
I just love Linux! For me it makes interacting with your computer fun and educational. I think if someone needs to learn about the core principles underlying an operating system and hardware, Linux is a great place to start.
Linux  Linux_Development  Linux_Command_Line 
february 2017 by GameGamer43
Terry : Fast boot using kexec
kexec is a system call that enables you to load and boot into another kernel from the currently running kernel. kexec performs the function of the boot loader from within the kernel. The primary difference between a standard system boot and a kexec boot is that the hardware initialization normally performed by the BIOS or firmware (depending on architecture) is not performed during a kexec boot. This has the effect of reducing the time required for a reboot.
Kexec  Linux  Linux_Development  Linux_Kernel 
february 2017 by GameGamer43
Tracing Routes through the Internet
If you've done any network troubleshooting, you've probably heard of the traceroute tool. It's a command-line utility that finds (traces) all the servers a packet of data will visit as it travels over the internet between your computer and some target server. For example, here's the route packets take from WonderProxy's server in London to our server in Lima, Peru:
Traceroute  Linux_Networking  Linux  Linux_Debugging  Computer_Networking 
february 2017 by GameGamer43
Mondo Rescue - GPL disaster recovery solution
Mondo Rescue is a GPL disaster recovery solution. It supports Linux (i386, x86_64, ia64) and FreeBSD (i386). It's packaged for multiple distributions (Fedora, RHEL, openSuSE, SLES, Mandriva, Mageia, Debian, Ubuntu, Gentoo).
Mondo_Rescue  Linux_Development  Linux  Backup_Software 
february 2017 by GameGamer43
Monitoring and Tuning the Linux Networking Stack: Sending Data - Packagecloud Blog
This blog post explains how computers running the Linux kernel send packets, as well as how to monitor and tune each component of the networking stack as packets flow from user programs to network hardware.
Linux  Linux_Development  Linux_Debugging  Linux_Networking 
february 2017 by GameGamer43
Understanding Firewalld in Multi-Zone Configurations | Linux Journal
Stories of compromised servers and data theft fill today's news. It isn't difficult for someone who has read an informative blog post to access a system via a misconfigured service, take advantage of a recently exposed vulnerability or gain control using a stolen password. Any of the many internet services found on a typical Linux server could harbor a vulnerability that grants unauthorized access to the system.
Linux_Journal  Linux  Linux_Development  Firewall  FirewallD 
february 2017 by GameGamer43
Customize your Login Screen via Linux's Message of the Day (Ubuntu/CentOS) - Servers for Hackers
See how you can customize the screen you see when you login to give you important information quickly.  Linux  Linux_Development  CentOS  Ubuntu 
january 2017 by GameGamer43
Consuming Web API JSON Data Using curl and jq | thisDaveJ
Hey everyone! I decided to put a few extra batteries in the background color of the article image above. 🙂 I’m actually pretty charged up about our topic today, particularly about jq, which is a lightweight and flexible command-line JSON processor with “batteries included”.
curl  jq  Linux  Linux_Development  JSON 
january 2017 by GameGamer43
Vidar’s Blog » dd is not a disk writing tool
If you’ve ever used dd, you’ve probably used it to read or write disk images:
Linux  Linux_Development  dd  Linux_Applications 
january 2017 by GameGamer43
How fast are Unix domain sockets?
It probably happened more than once, when you ask your team about how a reverse proxy should talk to the application backend server. “Unix sockets. They are faster.”, they’ll say. But how much faster this communication will be? And why a Unix domain socket is faster than an IP socket when multiple processes are talking to each other in the same machine? Before answering those questions, we should figure what Unix sockets really are.
Linux  Linux_Development  Unix_Domain_Sockets 
january 2017 by GameGamer43
At Long Last, Linux Gets Dynamic Tracing - The New Stack
When the Linux kernel version 4.9 will be released next week, it will come with the last pieces needed to offer to some long-awaited dynamic thread-tracing capabilities.
Linux  Linux_Kernel  Linux_Debugging  Linux_Development 
december 2016 by GameGamer43
How to log history and logins from multiple ssh-keys under one user account | Screenage
Many times your managed server has only one user account into wich every admin logs in with his personal ssh-key. Most times it’s done with the root account, but that’s a nother topic 😉 As a result of this behaviour your are not able to see who logged in and what he or she did. A often suggested solution would be using different user account per person with only one ssh-key for authorization. This adds the „overhead“ of memorizing (except when you use ~/.ssh/config) and managing the sudoers file for all the accounts.
SSH  OpenSSH  Linux  Linux_Development 
december 2016 by GameGamer43
How to make Linux more trustworthy | Ars Technica UK
Reproducible builds are a good step, but Red Hat and Ubuntu don't want to join in.
Linux  Arstechnica  Linux_Development 
december 2016 by GameGamer43
htop explained
Explanation of everything you can see in htop/top on Linux
Linux  Linux_Debugging  Linux_Development  Linux_Command_Line  htop 
december 2016 by GameGamer43
Syscall Auditing at Scale
If you are are an engineer whose organization uses Linux in production, I have two quick questions for you:
Linux  Linux_Development  Slack_Engineering  Slack 
november 2016 by GameGamer43
Anatomy of a Program in Memory
Memory management is the heart of operating systems; it is crucial for both programming and system administration. In the next few posts I’ll cover memory with an eye towards practical aspects, but without shying away from internals. While the concepts are generic, examples are mostly from Linux and Windows on 32-bit x86. This first post describes how programs are laid out in memory.
Programming  C  Linux  Linux_Development 
november 2016 by GameGamer43
Tutorial - Write a System Call
A while back, I wrote about writing a shell in C, a task which lets you peek under the covers of a tool you use daily. Underneath even a simple shell are many operating system calls, like read, fork, exec, wait, write, and chdir (to name a few). Now, it’s time to continue this journey down another level, and learn just how these system calls are implemented in Linux.
C  Linux  Linux_Development  Programming 
november 2016 by GameGamer43
Setting up a Linux system to do single-sign-on with Active Directory.
Here's some notes about how I made things work for myself, both to remind me in the future, and in hopes it will help you too. This was all done with a Debian Lenny system, but it should be very similar for other Linux distros. You'll need to adjust the package names appropriately, of course.
Active_Directory  Linux  Linux_Development  Single_Sign_On 
november 2016 by GameGamer43
Capturing Packets in Linux at a Speed of Millions of Packets per Second without Using Third Party Libraries
My article will tell you how to accept 10 million packets per second without using such libraries as Netmap, PF_RING, DPDK and other. We are going to do this with Linux kernel version 3.16 and some code in C and C++.
Linux  Linux_Development  Networking  Computer_Networking 
october 2016 by GameGamer43
Linux bcc tcptop
I recently wrote a tcptop tool using the new Linux BPF capabilities, which summarizes top active TCP sessions:
Linux  Linux_Debugging  Linux_Development  Brendan_Gregg 
october 2016 by GameGamer43
Linux Ethernet Bonding Driver HOWTO
The Linux bonding driver provides a method for aggregating
multiple network interfaces into a single logical "bonded" interface.
The behavior of the bonded interfaces depends upon the mode; generally
speaking, modes provide either hot standby or load balancing services.
Additionally, link integrity monitoring may be performed.
october 2016 by GameGamer43
Learn How to Use ‘fuser’ Command with Examples in Linux
One of the most important task in Linux systems administration, is process management. Its involves several operations under monitoring, signaling processes as well as setting processes priorities on the system.
Linux  Linux_Development 
october 2016 by GameGamer43
Linux Crypto: Introduction
Most of this series has been independently translated into Portuguese by Rafael Beraldo. Thanks very much, Rafael!
Linux  Linux_Development  Linux_Security  Cryptography 
october 2016 by GameGamer43
Understanding /proc
Last week I created a small ps clone in ruby. This was done purely out of curiosity, just wondering how does ps works and how it knows all about current running processes. You can find the project here.
Linux  Linux_Development  Linux_Kernel 
october 2016 by GameGamer43
ripgrep is faster than {grep, ag, git grep, ucg, pt, sift}
In this article I will introduce a new command line search tool, ripgrep, that combines the usability of The Silver Searcher (an ack clone) with the raw performance of GNU grep. ripgrep is fast, cross platform (with binaries available for Linux, Mac and Windows) and written in Rust.
GitHub_Repos  Linux  RIPgrep 
october 2016 by GameGamer43
Gotta Badge ‘Em All: Science
The Science badge is categorized as a “Quality [Assurance] Badge” and is defined in this Trac ticket. But what’s the real scoop behind the Science badge?
Linux  Linux_Kernel 
october 2016 by GameGamer43
ssh-add - adds RSA or DSA identities to the authentication agent
ssh-add adds RSA or DSA identities to the authentication agent, ssh-agent(1). When run without arguments, it adds the files ~/.ssh/id_rsa, ~/.ssh/id_dsa and ~/.ssh/identity. Alternative file names can be given on the command line. If any file requires a passphrase, ssh-add asks for the passphrase from the user. The passphrase is read from the user's tty. ssh-add retries the last passphrase if multiple identity files are given.
SSH  Linux  OpenSSH 
october 2016 by GameGamer43
Chapter 11. Installing and Configuring Tripwire
Tripwire software can help to ensure the integrity of critical system files and directories by identifying all changes made to them. Tripwire configuration options include the ability to receive alerts via email if particular files are altered and automated integrity checking via a cron job. Using Tripwire for intrusion detection and damage assessment helps you keep track of system changes and can speed the recovery from a break-in by reducing the number of files you must restore to repair the system.
CentOS  CentOS7  RedHat_Linux  TripWire  Linux  Linux_Security 
september 2016 by GameGamer43
Building the Fedora Kernel
Whether it’s curiosity or testing a patch, there are lots of reasons for compiling a kernel. This is a brief tutorial for compiling a kernel for Fedora.
Fedora  CentOS  Linux  Linux_Kernel 
september 2016 by GameGamer43
Building an IDS on CentOS using Suricata
One of the things I like to have on my internet servers is a basic Intrusion Detection System (IDS). This tells me interesting things like:
CentOS  Suricata  Linux  Linux_Security  CentOS7 
september 2016 by GameGamer43
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