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Create private networks with libvirt

I assume that you have a running debian wheezy host with libvirt and qemu/kvm installed. You need two guest VMs for this. The first guest will get the IP 192.168.100.2 and the second will get 192.168.100.100. All following commands must be run with sudo or under root.

Internal Network

We create a new network named internal with libvirt and use it with the IP

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#!/bin/sh

if [ "$EUID" -ne 0 ]; then 
	echo -e "\nPlease run as root\neg. sudo $0 \n"
	exit
fi

GITHUB_USERNAME="ebal"

cd `mktemp -d`

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Links:

• [sysadmin: disk-encryption-luks] (https://www.redhat.com/sysadmin/disk-encryption-luks)
• [archwiki: Dm-crypt] (https://wiki.archlinux.org/title/Dm-crypt)
• [archwiki: LVM on LUKS] (https://wiki.archlinux.org/title/Dm-crypt/Encrypting_an_entire_system#LVM_on_LUKS)
• [rhel 8: configuring-kernel-command-line-parameters] (https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/managing_monitoring_and_updating_the_kernel/configuring-kernel-command-line-parameters_managing-monitoring-and-updating-the-kernel)
• [rhel 7: working with the grub 2] (https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/system_administrators_guide/ch-working_with_the_grub_2_boot_loader)

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Linux - journalctl cheatsheet

journalctl

Display logs with tail:

sudo journalctl -f

Sources:

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CURL - cheatsheet

• XML GET

curl -H "Accept: application/xml" -H "Content-Type: application/xml" -X GET "http://hostname/resource"

• JSON GET

curl -i -H "Accept: application/json" -H "Content-Type: application/json" -X GET "http://hostname/resource"

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Overview: running crc on a remote server

This document shows how to deploy an OpenShift instance on a server using CodeReady Containers (crc) that can be accessed remotely from one or more client machines (sometimes called a "headless" instance). This provides a low-cost test and development platform that can be shared by developers. Deploying this way also allows a user to create an instance that uses more cpu and memory resources than may be available on his or her laptop.

While there are benefits to this type of deployment, please note that the primary use case for crc is to deploy a local OpenShift instance on a workstation or laptop and access it directly from the same machine. The headless setup is configured completely outside of crc itself, and supporting a headless setup is beyond the mission of the crc development team. Please do not ask for changes to crc to support this type of deployment, it will only cost the team time as they politely decline :)

The instructions here were tested with F

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Linux - Commands cheatsheet.md

usermod

Remove all secondary groups for user

• RHEL 7

usermod -G "" user

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Kubernetes (K8s)

Installation Minikube KVM (WIP)

Installation of Minikube in KVM Centos7 VM image with --vm-driver=none

Installation KVM image

Create Centos 7 KVM Image

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LPI-2 202 Notices

Topic 207: Domain Name Server

• 207.1 Basic DNS server configuration - 3
• 207.2 Create and maintain DNS zones - 3
• 207.3 Securing a DNS server - 2

Topic 208: Web Services

• 208.1 Implementing a web server - 4
• 208.2 Apache configuration for HTTPS - 3
• 208.3 Implementing a proxy server - 2

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Super Guide to the split-window tmux Subcommand (and Beyond)

Guide overview

tmux, like other great software, is deceptive. On the one hand, it's fairly easy to get set up and start using right away. On the other hand, unless your needs are simple, it's difficult to take advantage of all tmux can offer you without spending some quality alone time with the manual. But the problem with manuals is that they aren't geared toward beginners. They are geared toward helping seasoned developers and computer enthusiasts quickly obtain the