Reference Materials for DevOps and Automation courses

This is a collection of reference cards, cheat sheets, handbooks, and other materials that can be helpful for students of Red Hat GPTE courses.

Linux Commands

Even if you are a seasoned Linux user or admin, sometimes you need a refresher.

Basic Linux commands (source: https://developers.redhat.com/cheat-sheets/linux-commands-cheat-sheet)

Advanced Linux commands (source: https://developers.redhat.com/cheat-sheets/advanced-linux-commands)

Bash Commands

Bash Shell commands (source: https://learncodethehardway.org/unix/bash_cheat_sheet.pdf)

Vim Editor

There are many Vim cheat sheets, from 1-pagers to long handbooks covering every detail. We’ve chosen the ones that contain the most important information in the very beginning: how to exit Vim.

Vim Editor (source: https://github.com/rstacruz/cheatsheets/blob/master/vim.md)

VIM "for people who don’t want to use it , but have to…" https://www.cyberciti.biz/faq/linux-unix-vim-save-and-quit-command/

Git

We don’t use a full spectrum of Git commands in the courses. But we have to know how to configure add and remove remote repositories.

Git 6-pager (source: https://developers.redhat.com/cheat-sheets/git)

Git 2-pager from Github (source: https://education.github.com/git-cheat-sheet-education.pdf)

Git 1-pager (source: http://git.or.cz)

OpenShift

OpenShift oc command has a pretty good help system on its own, but sometimes it helps to have a cheat sheet handy.

OpenShift commands (source: https://developers.redhat.com/cheat-sheets/red-hat-openshift-container-platform)

etcd

You may want to explore etcd - the distributed database which stores information about the cluster. Also we use etcd as an example in the Operators Lab. You can use commands from the following cheat sheet to test its functionality. etcd Cheat Sheet: https://lzone.de/cheat-sheet/etcd

More detailed version is available on the CoreOS site: https://coreos.com/etcd/docs/latest/dev-guide/interacting_v3.html

Tmux

Tmux can help you with long-running scripts or playbooks. It preserves your session in case your host connection is lost.

https://tmuxcheatsheet.com/

Networking

Subnet Mask cheat sheet: https://www.aelius.com/njh/subnet_sheet.html

dig (DNS query tool) HOWTO: https://www.madboa.com/geek/dig/

Docker

Docker is the container engine used in most of OpenShift deployments. It helps to know basic Docker commands.

Docker commands (source: https://developers.redhat.com/cheat-sheets/containers/)

MongoDB

In some of our lab projects we use MongoDB. We don’t expect students to use MongoDB console commands, but it might be helpful to know some basics to debug if something does wrong with MongoDB cluster.

MongoDB commands (source: https://developers.redhat.com/cheat-sheets/mongodb-cheat-sheet)