dober

Memory LIMIT and REQUEST in Containers and JVM

Do you run a JVM inside a container on Kubernetes (or maybe OpenShift)?
Do you struggle with REQUEST and LIMIT parameters?
Do you know the impact of those parameters on your JVM?
Have you met OOM Killer?

Hope you will find answers to these questions in this example-based article.

How to set up JVM Heap size in a Container

	Calico	Flannel	Weave	Docker Overlay Network
Network Model	Pure Layer-3 Solution	VxLAN or UDP Channel	VxLAN or UDP Channel	VxLAN
Application Isolation	Profile Schema	CIDR Schema	CIDR Schema	CIDR Schema
Protocol Support	TCP, UDP, ICMP & ICMPv6	ALL	ALL	ALL

how to disable apt-daily.timer

$ systemctl stop apt-daily.timer
$ systemctl disable apt-daily.timer
$ systemctl mask apt-daily.service
$ systemctl daemon-reload

check current status

Installing Arch Linux with Full Disk Encryption

If you're aiming for a seamless Arch Linux installation in UEFI mode, follow along as this guide will walk you through the process step by step. We'll be using LUKS (Linux Unified Key Setup) and LVM (Logical Volume Manager) partitions on LUKS to achieve full disk encryption.

Note: I have updated this doc for UEFI mode. For those with BIOS/MBR systems, you can refer to the previous version, but keep in mind that it might be outdated and no longer accurate.

If you're only interested in installing Linux and not setting up dual boot with Windows, feel free to skip the Windows-related sections.

	#!/bin/sh
	# install needed curl package
	sudo apt install --no-install-recommends curl -y
	# install kubectl
	# https://github.com/kubernetes/minikube/issues/3437#issuecomment-449408316, maybe use https://storage.googleapis.com/minikube/releases/v0.30.0/docker-machine-driver-kvm2
	curl -Lo /tmp/kubectl https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl && \
	chmod +x /tmp/kubectl && \
	sudo mv /tmp/kubectl /usr/local/bin/kubectl
	# kubectl tab completion
	sudo sh -c 'echo "source <(kubectl completion bash)" > /etc/bash_completion.d/kubectl'

	##
	## How to install mcrypt in php7.2 / php7.3
	## Linux / MacOS / OSX
	##

	## https://lukasmestan.com/install-mcrypt-extension-in-php7-2/



	#

	# Use envFrom to load Secrets and ConfigMaps into environment variables

	apiVersion: apps/v1beta2
	kind: Deployment
	metadata:
	name: mans-not-hot
	labels:
	app: mans-not-hot
	spec:
	replicas: 1

	#!/usr/bin/env bash

	set -e

	CONTEXT="$1"

	if [[ -z ${CONTEXT} ]]; then
	echo "Usage: $0 KUBE-CONTEXT"
	exit 1
	fi

	pipeline {
	agent { node { label 'swarm-ci' } }

	environment {
	TEST_PREFIX = "test-IMAGE"
	TEST_IMAGE = "${env.TEST_PREFIX}:${env.BUILD_NUMBER}"
	TEST_CONTAINER = "${env.TEST_PREFIX}-${env.BUILD_NUMBER}"
	REGISTRY_ADDRESS = "my.registry.address.com"

	SLACK_CHANNEL = "#deployment-notifications"