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Azure VXLAN Issues

Introduction

Between June 24-25, the nodes in Tectonic clusters running on Azure automatically updated the OS from Container Linux 1353.8.0 to 1409.2.0. After this upgrade, the nodes began to experience increased latency and failure rate in requests. Interestingly, we found that the size of the HTTP request played a role in determining the success of requests to services running on the Kubernetes cluster. We found that setting the client's interface's MTU to 1370 made all requests succeed; incrementing the MTU to 1371 caused the failure of large HTTP requests to resurface. Additionally, enabling TCP MTU probing on the clients ensured all requests would succeed, albeit with increased latency. In order to identify the minimum set of circumstances needed to reproduce the issue, I ran several tests involving different network topologies.

malloc47

OS X Sierra + VirtualBox + Hammerspoon

I prefer different modifier keybindings for my VM vs. native OS X, but VirtualBox (unlike VMWare/Parallels) passes the keyboard through to the VM natively without the ability to remap it on the way through.

Apparently one would normally use Karabiner to do all manner of trickery to remap keys per application etc. but support for this utility was broken in OS X Sierra. Instead, I use a pair of scripts:

Wilfred

;;; dashtest.el --- benchmarking dash  -*- lexical-binding: t -*-

(defmacro --map-mapcar (form list)
  (declare (debug (form form)))
  `(mapcar (lambda (it) ,form) ,list))

(defmacro --map-loop (form list)
  (declare (debug (form form)))
  (let ((result-sym (make-symbol "result")))
    `(let (,result-sym)

v0lkan

#
# Needless to say, I (Volkan Ozcelik) take no responsibility, whatsoever,
# about what will happen to your NAS when you try these.
# When did it to mine, I observed *ENORMOUS* performance gain and a zen-like silence.
#
#     +----------------------------------------------------------+
#     |  WHAT YOU ARE GOING TO DO CAN LIKELY VOID YOUR WARRANTY  |
#     |                  SO PROCEED WITH CAUTION                 |
#     +----------------------------------------------------------+
#

olejorgenb

  ;; Only tested with spacemacs
  (defvar my-current-focus-symbol nil)
  (make-variable-buffer-local 'my-current-focus-symbol)
  (defvar my-focus-symbol-face 'hi-yellow)

  (defun mouse-set-point-and-hl-symbol (event)
    (interactive "e")

    (mouse-set-point event)
    ;; Evil workaround crap (without this every other click visual state is activated...)

mikeifomin

- name: wait_for http 
  command: "curl --silent {{ url }}"
  register: result
  until: result.stdout.find("200 OK") != -1
  retries: 60
  delay: 1
  changed_when: false

ethack

It "types" the contents of the clipboard.

Why can't you just paste the contents you ask? Sometimes pasting just doesn't work.

• One example is in system password fields on OSX.
• Sometimes you're working in a VM and the clipboard isn't shared.
• Other times you're working via Remote Desktop and again, the clipboard doesn't work in password boxes such as the system login prompts.
• Connected via RDP and clipboard sharing is disabled and so is mounting of local drives. If the system doesn't have internet access there's no easy way to get things like payloads or Powershell scripts onto it... until now.

Windows

The Windows version is written in AutoHotKey and easily compiles to an executable. It's a single line script that maps Ctrl-Shift-V to type the clipboard.

tanyuan

Smart Caps Lock: Remap to Control AND Escape (Linux, Mac, Windows)

把 Caps Lock 變成智慧的 Control 以及 Escape ：

• 單獨輕按一下就是 Escape 。
• 若按下時同時按著其他鍵，就會是 Control 。

這應該是 Vim 和 Emacs 的最佳解了！(Emacs? Bash 的快捷鍵就是 Emacs 系列的)

• Send Escape if you tap Caps Lock alone.

TheBB

SPC

SPC (Jump to word)

TAB (Previous buffer visible in window)

! (Run shell command)

’ (Pop up shell)

* / (Search in project)

0,1,…,9 (Jump to window)

: (Run M-x)

; (Comment operator)

? (Helm session with keybindings)

halberom

{# style 1 - long form #}
{% if filepath == '/var/opt/tomcat_1' %}
  {% set tomcat_value = tomcat_1_value %}
{% else %}
  {% set tomcat_value = tomcat_2_value %}
{% endif %}

{# style 2 - short form #}
{% set tomcat_value = tomcat_1_value if (filepath == '/var/opt/tomcat_1') else tomcat_2_value %}