DevOps Tracing: Tooling and Applications in UNIX Systems and Windows Environment
Delve into the world of DevOps tracing with a focus on tooling and applications across UNIX systems and Windows environments. Explore the fundamental concepts, kernel interrupts, process management, and system call tracing methodologies. Uncover the intricacies of ZFS, Solaris, DTrace, WSL, PowerShell, and more, offering a comprehensive view of modern tracing practices in diverse infrastructures.
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Presentation Transcript
HL DevOps Conversations Session #1: DevOps Tracing - Tooling and Applications
The Big Picture: Context Matters! UNIX Systems: AT&T Thompson, Kernighan and Ritchie - born in the 1970 s. Implemented in C Linear, Sequential (Virtual) Memory Model Everything not in RAM is (in) a File: Somewhere, Somehow, and maybe even RAM too! Multi-User Multi-Process Open and Shared for Collaboration by Default Context-Sensitive Interfaces Consoles and Terminals Shells and Processes Job Control: Fork, Exec, Pipeline, Co-Processing IPC and Berkeley Sockets Users, Groups, and Roles Context Switching Kernel Interrupts (IRQs) and Event Handling Process Interrupts: System Calls via libc, Signals POSIX Threads
Thematic Example 1: Joes S-Corp Infra Solaris 11.4 ZFS Robust, Scalable, Networked, Fast, Painless! Zones (Virtualization Containers ) www cms-build DTrace (dynamic kernel-centric tracing system) Hub (zeus) and Spoke (OCI Regional) Model VPN-based Zero-Trust Architecture
Thematic Example 2: Joes Windows Laptop Windows 10 Professional Windows Insider dev Flight Bleeding Edge often with dud releases Painless Kernel Rollback! WSL (2) PowerShell controlled with `wsl` Command Ubuntu 20.04 installed UNIX Toolchain git zsh emac screen pty ssh orthrus htop
htop on WSL Terminal UI top-matter CPUs and HyperThreading Memory Stats Process/Load Avg. Overview Process List Threads vs. Processes Tree View t or F5 Searching / or F3 , and Filtering F4 Killing k or F9 Listing Process Environment e Listing Open Files l System Call Tracing s
strace System Call Tracing on Linux System Calls, Userland versus Systemland CPU instruction execution strace Instrumentation on the UserLand (libc) side. Modes of operation Wrapper call Dynamically Hook into an existing pid (must have valid user permissions on pid) Bare bones, real time process/thread system call dump to STDERR.
htop on Joes S-Corp Infra Solaris vs. Linux htop deltas Solaris LWP vs. Linux Threads s : Solaris truss vs. Linux strace l : Solaris pmap + pfiles vs. Linux lsof htop on zeus htop in an OCI regional www Zone
Dynamic Kernel Tracing DTrace C/C++ Kernel-level Tracing and Profiling User-level Hooks and Probes on function entry and exit Native Dynamic Programming Language support /usr/sbin/dtrace programmable interface for awk-like scripting language bpftrace DTrace Port to Linux (5.3+) Berkeley Packet Filter Kernel Hooks and Probes Kernel Module-based (enabled on Ubuntu by default) Road Map for Dy-Lang support
