Rico's Nerd Cluster

「离开世界之前 一切都是过程」

Cyber Security - How SSL Works

nftables

what happens when you visit https://example.com (and why) HTTPS is secure because of TLS (formerly SSL). HTTPS = HTTP + TLS. SSL stands for Secure Sockets Layer. TLS is Transport Layer Security ...

Posted by Rico's Nerd Cluster on February 2, 2018

Linux - Networking 2 UDP Traffic Profiling

nftables

Loopback Traffic When profiling communication-heavy systems (e.g., DDS / ROS 2 workloads), it’s common to look at loopback (lo) traffic to understand inter-process communication on a single host. ...

Posted by Rico's Nerd Cluster on February 2, 2018

Linux - Process Signals SIGINT, SIGTERM, SIGKILL, SIGQUIT, and SIGTSTP Explained

NIC

Signal Number Description Keyboard How it’s sent / Source Handling / Behavior SIGINT 2 Interactive interrupt Ctr...

Posted by Rico's Nerd Cluster on January 29, 2018

Linux - Networking

NIC, Wireshark

Networking Layers: From DDS Payload to Wire Format When we talk about “sending a DDS message,” it’s easy to think of it as a single thing moving across the system. In reality, networking is layere...

Posted by Rico's Nerd Cluster on January 27, 2018

Linux - Power Loss Meltdown

initramfs

🚑 What broke Sudden power-loss left the system in an inconsistent state. (while /roota was being modified) First boot stopped in BusyBox with ALERT! UUI...

Posted by Rico's Nerd Cluster on January 25, 2018

Linux - Provisioning of My Machine

fzf

NVIDIA Driver Open the Additional Drivers application Select NVIDIA driver metapackage from nvidia-driver-570 (proprietary, tested) Reboot Run nvidia-smi to ensure it worked Nvidia Dock...

Posted by Rico's Nerd Cluster on January 23, 2018

Linux - Operating System

Paging, Concurrency, Time

Paging A page of memory is the smallest fixed-length block of virtual memory managed by OS. To use virtual memory, the OS needs to transfer pages between the main memory and the secondary memory. ...

Posted by Rico's Nerd Cluster on January 20, 2018

Linux Miscellaneous Thingies

Window Focus, Screenshots, File System, Shortkeys, UART, Tmux, ffmpeg, Firefox, Chrome, Power Modes

Screenshots sudo apt install gnome-screenshot Open keyboard shortcuts -> add custom shortcuts I use ctrl-alt-4 to enable gnome-screenshot -a Window Focus ===========================...

Posted by Rico's Nerd Cluster on January 17, 2018

Linux - Packaging Systems

apt, dpkg

Installation Chain apt, apt-get, apt-cache talks to the repository servers, download .deb, calculate dependency tree, the hand the final files to dpkg for the actual install. E.g., 1 sudo apt ins...

Posted by Rico's Nerd Cluster on January 16, 2018

Linux - Programming And Toolchain

ldd

ELF and Dynamic Linking Executable and Linkable Format (ELF) is the standard binary file format on Linux, most BSDs, and many embedded systems. It replaces older a.out and COFF formats. | Aspect ...

Posted by Rico's Nerd Cluster on January 13, 2018

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Robotics @ Northwestern University

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