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unstable(message):

• like a warning: doesn't abort nor the current step, neither the entire build, code continues running
• current step is flagged in orange
• the build is flagged as UNSTABLE (if not already flagged as FAILED as build status can only get worse, not better)
• the step's log is not expanded by default in BlueOcean

error(message):

• like an exception, similar to throw new Exception(message): aborts both the current step as well as the entire build (only code from current parallel steps continues until completion)

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eBPF (or, simply BPF)

Why these tools? Why eBPF?

Linux tracing overview

But first, perf

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A distributed in-memory key-value store

A rudimentary example of a distributed in-memory key-value store (with lots of bugs)

Usage

In one terminal:

ruby server.rb 4001

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#!/usr/bin/env ruby

require 'csv'
require 'time'
require 'cgi'
require 'erb'
require 'json'

template =
  <<~HTML

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Примерен учебен план за програмиране

Темите, маркирани тук, са неща, за които е добре да имате някаква идея, ако искате да се развивате в посока програмиране. Темите са ориентировъчни и списъкът е далеч от изчерпателен, но все пак, дава начало и посока.

Има различни специализации на програмиране – web разработка (front end, back end), мобилни приложения (iOS, Android, ...), machine learning, QA инженери, пишещи автоматизирани тестове и други. Web разработката е много перспективна и универсално приложима. Специализацията може да дойде впоследствие. За почти всички тях, частично познаване на тези теми ще е полезно.

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aws-auth() {
    aws_profile="$1"

    if [ -z "$aws_profile" ]; then
        echo "Usage: $0 <aws-profile>" >&2
        return 1
    fi

    echo "Obtaining MFA ARN for profile '$aws_profile'..."
    if ! response=`aws --profile "$aws_profile" iam list-mfa-devices` || \

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Tooling

Basic setup, macOS tips & misc

• Homebrew for installing packages & brew cask for precompiled binaries.
• brew services list for managing daemons.
• Booting Rack apps with puma-dev via HTTPS – I've added its unique CA to my system's trusted certs (see how here).
• Dash for offline docs. It's running constantly and a global hotkey (Cmd + Shift + Space) shows its window. It's also integrated with my editor.

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Ensure will always catch Timeout::Error but nested rescue clauses will not, unless a custom exception class is used as per the docs:

The exception thrown to terminate the given block cannot be rescued inside the block unless klass is given explicitly.

No rescue:

irb(main):001:0> Timeout.timeout 1 do
irb(main):002:1*   puts 'sleeping'
irb(main):003:1>   sleep 2

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Kubernetes Networking Workshop

Goal

ns (10.192.10.200/24) -- veth pair -- cni0 bridge (10.192.10.1/24) -- flannel.1 vxlan (10.192.10.0/32) -- ec2 -- ec2 -- flannel.1 vxlan (10.192.11.0/32) -- cni0 bridge (10.192.11.1/24) -- veth pair -- ns (10.192.11.200/24)

Step 1: VXLAN

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Ruby workshop agenda

1. Data types
2. Basic syntax
3. Objects, data types/structures (basic)
4. Ecosystem – gems, docs; C extensions
5. Blocks & loops

Advanced: