Saqib Hussain SaqibHussain44

My Openshift Cheatsheet

Openshift Secrets

"There are different secret types which can be used to enforce usernames and keys in the secret object: service-account-token, basic-auth, ssh-auth, tls and opaque. The default type is opaque. The opaque type does not perform any validation, and allows unstructured key:value pairs that can contain arbitrary values.

Data is stored inside a secret resource using base64 encoding. When data from a secret is injected into a container, the data is decoded and either mounted as a file, or injected as environment variables inside the container."

To create ssh secret:

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Official List of all commands

Windows
Mac

Openshift cluster setup

Create Machines

For the purpose of this guide lets take these 5 machines

1 master node
1 infra node
3 Compute nodes

Once machines are created, ensure that they're in the same subnet network and can talk to each other using hostnames

Resize a Hard Disk for a Virtual Machine

Our Virtual Machines are provisioned using Vagrant from a Linux base box to run using VirutalBox. If the Hard Disk space runs out and you cannot remove files to free-up space, you can resize the Hard Disk using some VirtualBox and Linux commands.

Some assumptions

The following steps assume you've got a set-up like mine, where:

Typing vagrant from the command line will display a list of all available commands.

Be sure that you are in the same directory as the Vagrantfile when running these commands!

Creating a VM

vagrant init -- Initialize Vagrant with a Vagrantfile and ./.vagrant directory, using no specified base image. Before you can do vagrant up, you'll need to specify a base image in the Vagrantfile.
vagrant init <boxpath> -- Initialize Vagrant with a specific box. To find a box, go to the public Vagrant box catalog. When you find one you like, just replace it's name with boxpath. For example, vagrant init ubuntu/trusty64.

Starting a VM

vagrant up -- starts vagrant environment (also provisions only on the FIRST vagrant up)

Say I have 5 files: (file1, file2, ... file5).

All have been commited.

Say now all 5 files have been changed.

When you issue git status, all 5 files should be shown as (red) unstaged status.

Say I am happy with the changes in file1 to file4, but not file5 (i.e. I'd like to revert file5 to the last committed stage).

	const express = require('express');
	const passport = require('passport');
	var session = require('express-session');
	var docusign = require('./src/index');

	const app = express();
	const port = process.env.PORT \|\| 3000;
	const host = process.env.HOST \|\| 'localhost';

	app.use(session({

	First, install nginx for mac with "brew install nginx".

	Then follow homebrew's instructions to know where the config file is.

	1. To use https you will need a self-signed certificate: https://devcenter.heroku.com/articles/ssl-certificate-self
	2. Copy it somewhere (use full path in the example below for server.* files)
	3. sudo nginx -s reload
	4. Access https://localhost/

	Edit /usr/local/etc/nginx/nginx.conf:

	# By default, Docker containers run as the root user. This is bad because:
	# 1) You're more likely to modify up settings that you shouldn't be
	# 2) If an attacker gets access to your container - well, that's bad if they're root.
	# Here's how you can run change a Docker container to run as a non-root user

	## CREATE APP USER ##

	# Create the home directory for the new app user.
	RUN mkdir -p /home/app

	Vagrant.configure("2") do \|config\|
	config.vm.box = "continuumio/anaconda3"
	config.vm.define "conda" do\|conda\|
	conda.vm.hostname = "conda"
	conda.vm.network "private_network", ip: "10.0.0.1"
	end
	config.vm.provider "virtualbox" do \|v\|
	v.memory = 1024
	v.cpus = 2
	end