Pierre-Yves Aillet pyaillet

Multiple git identities on one machine

One machine, several git identities (personal vs work, GitHub vs GitLab, two accounts on one provider). Each repository picks its own name, email and credentials. In a hurry: Appendix B, once per rule.

A wrong identity does not fail: git commits and pushes under the wrong author. Part 1 ends with the check that catches it.

Requirements

Feature	Minimum git

3 Virtual Machines Kubernetes cluster

Dependencies

You should install VirtualBox and Vagrant before you start.

Creating the cluster

You should create a Vagrantfile in an empty directory with the following content:

0.1. References
0.2. Other cheatsheets
0.3. Manage multiple gcloud config configurations
- 0.3.1. Switch gcloud context with gcloud config
0.4. Credentials
0.5. info
0.6. projects
0.7. zones & regions
0.8. Organization
0.9. billing

MicroService Proxy Gateway Solutions

Kong, Traefik, Caddy, Linkerd, Fabio, Vulcand, and Netflix Zuul seem to be the most common in microservice proxy/gateway solutions. Kubernetes Ingress is often a simple Ngnix, which is difficult to separate the popularity from other things.

Github Star Trend:

This is just a picture of this link from March 2, 2019

Originally, I had included some other solution

Container security notes

Internet references

Kernel and architecture

namespaces - overview of Linux namespaces http://man7.org/linux/man-pages/man7/namespaces.7.html
mount_namespaces - overview of Linux mount namespaces

There are three easy to make mistakes in go. I present them here in the way they are often found in the wild, not in the way that is easiest to understand.

All three of these mistakes have been made in Kubernetes code, getting past code review at least once each that I know of.

Loop variables are scoped outside the loop.

What do these lines do? Make predictions and then scroll down.

func print(pi *int) { fmt.Println(*pi) }

Moved to git-repository: https://github.com/denji/awesome-http-benchmark

Tools

Located in alphabetical order (not prefer)

ab – slow and single threaded, written in C
apib – most of the features of ApacheBench (ab), also designed as a more modern replacement, written in C
autocannon – fast HTTP/1.1 benchmarking tool written in Node.js
baloo – Expressive end-to-end HTTP API testing made easy, written in Go (golang)

	#!/bin/bash

	#qemu-img create -f qcow2 disk.qcow2 20G
	#qemu-img create -f qcow2 varstore.img 128M
	debian_iso=debian-9.6.0-arm64-xfce-CD-1.iso
	qemu-system-aarch64 -smp cpus=6 -M virt -cpu max -m 2G -nographic \
	-drive file=QEMU_EFI.img,if=pflash,format=raw \
	-drive file=varstore.img,if=pflash \
	-drive file=disk.qcow2,if=virtio \
	-drive file=$debian_iso,if=virtio,format=raw

	#!/bin/bash -e

	# Usage ./k8s-service-account-kubeconfig.sh ( namespace ) ( service account name )

	TEMPDIR=$( mktemp -d )

	trap "{ rm -rf $TEMPDIR ; exit 255; }" EXIT

	SA_SECRET=$( kubectl get sa -n $1 $2 -o jsonpath='{.secrets[0].name}' )

	IL that git push -u origin my-new-branch is no more needed with push.autoSetupRemote :
	git config --global --add --bool push.autoSetupRemote true

	git config --global --add --bool pull.rebase true
	git config --global --add --bool rebase.autoStash true
	git config --global --add --bool fetch.prune true
	# git undo
	git config --global alias.undo '!f() { \
	git reset --hard $(git rev-parse --abbrev-ref HEAD)@{${1-1}}; \
	}; f' => http://megakemp.com/2016/08/25/git-undo/