Stephen Vo hai-voquang

My Openshift Cheatsheet

Examine the cluster quota defined for the environment:

$ oc describe AppliedClusterResourceQuota

Install pkgs using yum in a Dockerfile

Red Hat Security: Securing Containers & OpenShift (DO425)

Last update: Tue Jan 14 23:15:49 UTC 2020 by @luckylittle

Objectives

Understand, identify, and work with containerization features
Deploy a preconfigured application and identify crucial features such as namespaces, SELinux labels, and cgroups

My Openshift Cheatsheet

Openshift build secrets for cloning git repos using SSH Keys

To create ssh secret:

oc create secret generic sshsecret \
    --from-file=ssh-privatekey=$HOME/.ssh/id_rsa

Setup CodeReady Containers -1.14.0 on Remote Server and connect from Laptop.
These steps work for Fedora 31.

Setup On the remote host
Setup On the Laptop

On-the-remote-host

Two way iframe communication

The main difference between the two pages is the method of sending messages. Recieving messages is the same in both.

Parent

Send messages to iframe using iframeEl.contentWindow.postMessage Recieve messages using window.addEventListener('message')

iframe

Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

General rules

Follow standard conventions.
Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
Boy scout rule. Leave the campground cleaner than you found it.
Always find root cause. Always look for the root cause of a problem.

Design rules

Installing Xdebug for XAMPP with PHP 7.x

Requirements

XAMPP for Windows: https://www.apachefriends.org/download.html
The VC14 builds require to have the Visual C++ Redistributable for Visual Studio 2015 x86 or x64 installed
The VC15 builds require to have the Visual C++ Redistributable for Visual Studio 2017 x64 or x86 installed

	oc create serviceaccount user-root

	oc adm policy add-scc-to-user anyuid -z user-root

	oc patch dc/myAppNeedsRoot --patch '{"spec":{"template":{"spec":{"serviceAccountName": "user-root"}}}}'

	or

	oc set sa dc myAppNeedsRoot user-root

	apply plugin: 'java'
	apply plugin: 'eclipse'

	sourceCompatibility = JavaVersion.VERSION_1_8
	targetCompatibility = JavaVersion.VERSION_1_8

	eclipseJdt << {
	ant.propertyfile(file: ".settings/org.eclipse.core.resources.prefs") {
	ant.entry(key: "eclipse.preferences.version", value: "1")
	ant.entry(key: "encoding/<project>", value: "utf-8")

	#!/usr/bin/env bash

	# Secure workaround for https://issues.sonatype.org/browse/MVNCENTRAL-1369
	# Navigate to the root of your Spring Boot project where a Maven wrapper is present and run this script

	cd .mvn/wrapper
	wget https://gist.githubusercontent.com/kbastani/d4b4c92969ec5a22681bb3daa4a80343/raw/f166086ef051369383b02dfb74317cd07b6f2c6e/settings.xml

	cd ../../
	./mvnw clean install -s .mvn/wrapper/settings.xml