Rico's Nerd Cluster

「离开世界之前 一切都是过程」

Linux - Storage: Filesystems, NVMe, SATA, and eMMC

What happens when a program reads a file, and how NVMe, SATA, and eMMC differ

Filesystems A filesystem is the system that organizes files and directories on a storage device. It keeps track of file names, where each file’s data lives, permissions, and available space. For h...

Posted by Rico's Nerd Cluster on May 5, 2018

USB

HID

Main USB Device Classes Here are the big categories you’ll actually see in robotics / embedded: 1. CDC (Communication Device Class) — USB Serial Appears as: /dev/ttyUSB0, /dev/ttyACM0 Emula...

Posted by Rico's Nerd Cluster on May 3, 2018

Virtual Network Computing (VNC)

Graphical Desktop Environment

What is vncviewer vncviewer (virtual network computing) client allows one to interact with a remote computer’s graphical desktop environment. It’s run inside the docker. vncviewer Setup File Dir...

Posted by Rico's Nerd Cluster on May 1, 2018

Cyber Security - How SSL Works

nftables

About Navi Navi is an interactive command-line cheatsheet tool that helps you find, fill in, and run common commands without memorizing every flag or workflow. It lets you browse cheatsheets, sele...

Posted by Rico's Nerd Cluster on February 6, 2018

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

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要做一个有 swag 的机器人工程师
Robotics @ Northwestern University

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