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Format USB drive in MacOS

Elasticsearch delete records from index by query

Send email in Python using sendmail

Send mail with sendmail in bash

Working with journalctl

Python json tool module

Bypass host key checking in Ansible

Run OpenVAS security scanner in Docker container and scan any host for vulnerabilities

What is pom (pom.xml)

Common Linux network tools

Test SMTP server with swaks

Windows Powershell tip to make Internet to work in WSL2 console when connected to Cisco VPN

bash: go to beginning and the end of typed command

Chef Server

Ansible File module

Vim: sessions

OpenStack core services

ps

Kubernetes port forwarding from running Pod to curent machine with kubectl

Ansible colors in output

Vim: external commands

tar with progress

Export GPG public and private keys to a file

Kubernetes Deployment with ConfigMap example

Ansible Setup module

Kubernetes ConfigMap example

Convert Ansible YAML inventory to JSON using Python

view

Travis CI brief overview

Unit testing in Chef with ChefSpec example

Ansible inventory in YAML

RabbitMQ export messages from queue without affecting it

Using at to schedule tasks

What process is listening on port 14777?

Overriding inventory variables with -e switch in Ansible

AWS S3 bucket policy to access from source IP

Grepping unneded lines from file

Mongo get more results at once by changing the shellBatchSize

Copy Apache config files with Ansible example

Test Driven Development

Check Elasticsearch status

mongodump a collection to a directory

AWS CLI get all instances with tag ENV: DEV for inventory

Check puppet status on all servers using Ansible

Fix merge conflict in git

Docker ecosystem

Using groupvars in the Ansible inventory

Kubernetes rollout deployment

What is time sharing

Vim: tabs

date

Make use of ranges in the Ansible inventory

Kubernetes set image in a deployment in imperative way

Vim: undo

Test Kitchen in Chef

Kubernetes get all objects in all namespaces

Priority in hostvars in Ansible inventory

Infrastructure as a Service (IaaS)

Delete a tag and re-tag in git

rm

Become as superuser setting in Ansible inventory hostvars

Default rollout history limit in Kubernetes

Chef Foodcritic

Vim: working with buffers

mkdir

Delete all Elasticsearch indices from 2020

Specify other port for SSH in the Ansible inventory hostvars

Show pod labels in Kubernetes

ChefSpec in Chef

hostname

Set Ansible user in the inventory via hostvars

MiliCPUs in Kubernetes resources

Print variables associated with ChefDK

Fix 403 error in webserver caused by SELinux

man

Ansible list hosts in specific group

Kubernetes resources

Invoke ruby via Chef

which

Inheriting groups in Ansible inventory

Check syntax of ruby file

Kubernetes - verify what you can do with current credentials

Get Docker statistics

Chef testing

w

Condensed view in Ansible

Kubernetes probes

docker-compose - override default container startup command and volumes example

Notifications and subscriptions in Chef

uptime

Scale replicaset to n replicas in Kubernetes

Specify in the Ansible inventory that no transport mechanism like SSH is required

Multi-stage Docker build for serving static content using React application

Using wilcard in Ansible inventory

Embedded Ruby (ERB) template file in Chef

Create a deployment for test in Kubernetes in imperative way

Fix error of cannot login to phpMyAdmin due plugin changes

Basic implementation of user and group resources in Chef

Execute Ansible with ping module with host key checking disabled

uname

Kubernetes example - deployment in declarative way

What is a Docker container

Ansible configuration files priority

Generate a fingerprint for host and IPs to compare values from known_hosts

touch

Kubernetes example - replicaset yaml in declarative way

tmux rename session

Chef guard attributes or conditionals

What is the Docker build context

ReplicaSet in Kubernetes

SSH connectivity overview

Ansible Playbook

execute resource with examples and alternatives in Chef

tmux status line

What is a namespace in Kubernetes

Ansible Executable

tmux sessions

bash inline script example in Chef

docker run alternative

The 'pause' container in Kubernetes pod

Ansible inventories

remote_file resource in Chef

tmux

What is a Docker image

Ansible modules

cookbook_file resource in Chef

Kubernetes cluster components

Removing stopped containers in Docker

Ansible core components

Chef ERB templates with Ohai example

Install completion in Kubernetes

docker-compose example with NodeJS and Redis

Get information about the shell in Linux

Ansible

Chef generate a template command

Docker commit example

Start dashboard and enable proxy in minikube

Calling a cookbook with a particular recipe(s) in mind

Implement Postfix header checks

Testing nginx container bash script (docker-entrypoint.sh)

include_recipe syntax in default.rb in a Chef cookbook

Setup minikube running on Docker in Debian

Run sample React application in Debian

Convergence

Mapping a file to a variable in bash

Dockerize a simple NodeJS app

Deploying hello-app deployment and service on minikube

Clean apt cache

What is Alpine in a Docker world for an image

Expose a port from Pod to host in Kubernetes

Copy-on-Write

Kubernetes: copy files from/to container

Find files modified last 30 days

Install MariaDB with phpmyadmin and secure the access to it with .htaccess

Get how many layers your Docker image is composed of

Chef recipe

Idempotence

Setup a Kubernetes cluster using kubeadm, Vagrant, Centos 7 and libvirt (KVM)

Container restart policies in docker-compose

What is a kernel system call

Chef Ohai

OpenSSH - generate public key from the private key

Test Docker image for vulnerabilities with Snyk

Hello world using Chef

Running pods in Kubernetes

Take screenshot of a region in Windows

Docker image creation and optimization Example 2

Docker image creation and optimization Example 1

Main keys in Kubernetes API object yaml file

Chef resource

Running an interactive shell in a container

Tagging an image for Docker Hub

Exploring the Kubernetes API

Chef Development Kit

Vagrant with libvirt on Debian testing

What are Linux capabiities

Linux kernel Control Groups (cgroups)

Linux kernel namespacing

Infrastructure as a Code

Stop Docker containers

lsblk

.vimrc for kubectl

Using bind mount directories in Docker

Fixing issue with black screen after suspending in XFCE

Vim: Text manipulation

Replace string with another string with regexp in Ansible

Docker custom search images examples

Vim: Status

Set CPU limitation to Docker containers

apg - a cli password generator

Setup Apache vhost with LetsEncrypt certificate on Debian

Vim: Recording macros

Set hard and soft memory limitation to Docker container

mail command in Linux - send email in cli

Run MongoDB and Mongo Express in Kubernetes

Vim: Searching and replacing

List resources that are bound or not bound to namespace in Kubernetes

Ansible code to add Grafana users

ohai values interpolation in Chef

Change default namespace in Kubernetes

Install Docker on Debian testing

Java process core dump

Integer division in Python

Detach from running Docker container

Vim: pasting

Docker compose file for Mongo and Mongo Express

nginx virtual host for reverse proxy

Run Mongo and Mongo Express using Docker

Install minikube with KVM on Debian testing

Show hidden files in Gnome

Tell Ansible to use a list of hosts rather than inventory file

Analyze file metadata with file command

Vim: delete

Formatting strings in Python

Remove NVIDIA drivers and install open-source Nouveau display drivers in Debian

Passing extra variables to Ansible playbook in a JSON format

Python list comporehension

vsftpd config for default installation

Show memory hardware information

Ansible role which use pinning instead of holding to keep the Ubuntu packages from being upgraded

Snake case

Example of formatting strings in Python

Vim basic modes

Fix MySQL error "Plugin caching_sha2_password could not be loaded"

Vertical format for docker ps

Prevent ssh from disconnecting on client side

Locals in Terraform

exec

Run gvim on a remote host

Get firewalld services on CentOS

for statement using dictionaries and macros in jinja2 templates with Ansible

Linux file types

Vim - substitute in multiple files

bash until

Temporary fix for black Google Chrome windows after suspend

About vi

Expire user password and force reset at next login in Linux

Create AWS S3 resource with Terraform using interpolation

Prepare an Ansible testing environment

Vim yank

bash if

What is continuous deployment

What is continuous delivery

What is continuous integration

What are Ansible variables

Vim visual mode

Basic printf/scanf in C

Vim insert mode

jinja2 map filter

Delete a file from tar archive

for statement using dictionaries in jinja2 templates with Ansible

Configure OWASP scan with dependency check plugin in Jenkins pipeline project

Get help in Linux

Scan for writable directories with find

What are Ansible facts

vim - navigating the file

Hello world in C

Create default Ansible role directory structure with Molecule

Setup grafana with Cloudwatch without IAM user

jinja2 default filter

vim help

Legal C digraphs

jinja2 join filter

Go to the shell output in Midnight Commander

C comments

Installing C compiler on Linux

vim save and quit

for statement in Jinja2 templates with Ansible

Ansible load vault password from a file

if statement in Jinja2 templates with Ansible

Jenkins terms

Working with lists in Ansible

Find files and directories with nouser and nogroup

Go to beginning and end of the file in nano

Run the OOM adjustments on all php-fpm childs

Uninstall VMWare Workstation in Debian

Grab all urls from saved html file with python and beautifulsoup

Network card firmware install in Debian

Display available versions of a package in Debian/Ubuntu

Set tab spaces to 2 in vim to edit yaml and python files

Ansible tasks plays and playbooks

Copy directory and preserve all permissions in Linux

YAML basics

Allow incoming SYN packets to all listening ports using iptables and Ansible

Uninstall validate_password plugin for MySQL

Lock user password

Enumerate fields for local credentials databases

Most used Desktop Environments

Linux boot process

Virtualbox replacement in Debian

Ansible role directory components

KVM clipboard sharing

Common tests in bash for conditional statements

REST clients

What is piping in bash

What is a Linux distribution

Suspend in older versions of Gnome

Linux network commands

Enable windows title buttons (minimize, maximize) in Debian Gnome

View kernel messages in Linux

Listing devices in Linux

woeusb - burn Windows ISO to flash from Linux

Linux kernel modules tools

Download manager which monitors clipboard

Pseudo file systems in Linux

Create a temporary files in scripts

passwd shadow group files structure

Get the number of threads for a running process in Linux

Brackets in bash

Simulate a package installation with apt

Convert to lower case with tr

Things to do after creating systemd unit file

How to enable debug in bash script

Single and double quotes in bash

Enable line wrapping in nano

Crontab for MySQL backup

How to kill nginx caching

Create a bash function with parameters

Generate a sequence of numbers in bash

Get a proper list of services which are currently running

Routers, hubs and switches

Rename multiple files by pattern in bash with find

Get instance metadata in AWS

Generate file contents using cat, here-document and environment variables

Over 300GB logs size due to "AER PCIe Bus" errors

Disable automatic sleep in Debian testing

Resizing AWS EC2 partition

Read yaml values from encrypted file with ansible-vault using python

Check if string is present in usernames in multiple AWS accounts using awscli and jq

Quick way to create a dababase and user with password for MySQL/MariaDB

Monitor page load with PhantomJS, Nagios and Ruby

Several methods to write ISO to flash drive

Drop multiple measurements from InfluxDB database using a pattern

Archive all directory logs except today with find and gzip

Format strings in Terraform

Save results of MongoDB query in a JSON file

Check Elasticsearch status from Nagios

Don't log commonly missing files in nginx

Pack and delete only specified log files by template with tar seq and printf

Convert a MongoDB cloned server from replica set to a stand alone server

How to scroll inside screen

How to retrieve entire site via command line using wget

How to reset the password for any RabbitMQ user

Batch change passwords on multiple AWS accounts

Restart Gnome-shell without killing running applications

Executing bash and groovy commands on a Jenkins node

Modify default autogen retention policy in InfluxDB

How to remove "Send to device" in Chrome right click

Delete artifact from Nexus repository using REST API

Get IP address from console

Take a screenshot of a specific area in Gnome

What is cloud computing

Check password protected certificate expiration date with OpenSSL

Linux add swap space oneliner