mikesparr

#!/usr/bin/env bash

#####################################################################
# REFERENCES
# - https://github.com/esnet/iperf
# - https://cloud.google.com/artifact-registry/docs/docker/store-docker-container-images 
# - https://kubernetes.io/docs/tasks/inject-data-application/define-command-argument-container/
# - https://kubernetes.io/docs/concepts/workloads/controllers/job/
#####################################################################

WadeBarnes

Queries to determine how much a container is being throttled

Examples courtesy of Jason Leach.

Example promql query for OCP:

avg(container_cpu_cfs_throttled_periods_total / container_cpu_cfs_periods_total {namespace=~"4a9599-prod", pod=~".*mediator.*", container_name!="POD", image!=""} * 100) BY (pod) 

• The namespace portion of the query can be a problem when querying inside a namespace.

ntimo

---

stages:
  - tpl_test
  - tpl_sync

integration_tests:
  stage: tpl_test
  image:
    name: ubuntu:20.04

Bill-tran

How To Install OpenSSL 1.1.1 on CentOS 7

This tutorial goes through how to install openssl 1.1.1 on CentOS 7, since the yum repo only installs up to openssl 1.0.

Requirements

Upgrade the system

yum -y update

peterroth

brew install automake libtool wget
wget https://github.com/google/protobuf/releases/download/v2.5.0/protobuf-2.5.0.tar.bz2
tar -xvjf protobuf-2.5.0.tar.bz2
cd protobuf-2.5.0
./autogen.sh
./configure
make; make check
sudo make install

Validate the successful installation:

Equim-chan

Equim’s SOP for Archiving YouTube Livestream

This document describes an SOP for archiving a YouTube livestream, either public or private.

The demonstrations below are operated under Arch Linux, but it should work on other systems as well, including Windows MSYS2.

This SOP was originally written for archiving Gawr Gura’s unarchived streams.

Overview

onomatopellan

1. Ubuntu WSL2 must be already installed in C: system drive and user should be able to call windows binaries like wsl.exe from bash.

2. We will install Alpine WSL2 distro in an external partition/disk:

    Download Alpine from here:
    https://github.com/yuk7/AlpineWSL/releases/download/3.11.5-1/Alpine.zip

    Extract the files in an external partition/disk. (for example D:\Alpine)
    Make sure WSL2 is enabled by default (wsl.exe --set-default-version 2)
    Inside the Alpine folder run Alpine.exe to install the Distro. An ext4.vhdx file will be created in that same folder.

yosisa

docker/image:name

max-rocket-internet

CPU: percentage of limit

A lot of people land when trying to find out how to calculate CPU usage metric correctly in prometheus, myself included! So I'll post what I eventually ended up using as I think it's still a little difficult trying to tie together all the snippets of info here and elsewhere.

This is specific to k8s and containers that have CPU limits set.

To show CPU usage as a percentage of the limit given to the container, this is the Prometheus query we used to create nice graphs in Grafana:

sum(rate(container_cpu_usage_seconds_total{name!~".*prometheus.*", image!="", container_name!="POD"}[5m])) by (pod_name, container_name) /

nchaigne

Building GCC 9.2.0 on CentOS 7

Introduction

CentOS 7 distribution (as well as RHEL 7) ships with a somewhat outdated version of the GCC compiler (4.8.5 on CentOS 7.5), which may not be suitable to your compilation requirements. For example, C11 - which supersedes C99 - is fully supported only starting from GCC 4.9).

Additionally, recent versions of GCC (GCC6, GCC7, GCC8, GCC9) come with improvements which help detect issues at build time and offer suggestions on how to fix them. Sometimes, these are even actually helpful!

This note describes how to build the latest GCC (9.2.0 as of October 2019) from sources on CentOS 7. This should be applicable as is on RHEL 7. For other Linux distributions, adapt as needed.