Jag Thoutam jaganthoutam

^{TODO Start saving posts off Stackoverflow, and only contribute conservatively.}

What is the purpose of FreeSWITCH's `mod_esl`?

^{There is [another question][1] trying to figure out the connection between mod_event_socket and the Event Socket Library (ESL).}

The [Event Socket Library][2] itself is a C library ([libesl][3]) that can be used to build external C applications to control FreeSWITCH via its [event system][4].

As far as I understand, [mod_esl][5] is only a FreeSWITCH module wrapper around [libesl][3], used to extend programming languages with the same functionality (i.e., to control a FreeSWITCH instance). The [documentation][5] doesn't mention this, but basing this assumption on the quoted sources below, and on the fact that I couldn't find anyone ever using it directly (i.e., found no mailing list question, nothing on slack, no SO questions, no blog posts, [the books][6] also barely mention it, and so on). Are there any other use cases that I'm missing?

How To Install OpenSSL 1.1.1 on CentOS 7

This tutorial goes through how to install openssl 1.1.1 on CentOS 7, since the yum repo only installs up to openssl 1.0.

Requirements

Upgrade the system

yum -y update

[Also see scotch.io] (https://scotch.io/tutorials/how-to-create-a-vagrant-base-box-from-an-existing-one)

Build vagrant box from an existing one

cd homestead
vagrant package --output ../boxes/homestead.box
vagrant box add homestead_100gb ../boxes/homestead.box
cd ..
mkdir homestead_100gb
vagrant init # or copy VagrantFile from somewhere else and change config.vm.box to "homestead_100gb"

How to Install Vagrant and Virtualbox Fedora 27

Check for cpu Virtualization

lsmod | grep kvm
kvm_intel             167936  3
kvm                   499712  1 kvm_intel

Install

Installing Docker CE Edge for Ubuntu Linux

Remove previous versions of Docker and Compose

sudo apt-get purge docker-compose
sudo apt-get purge docker-ce

	# Source: https://gist.github.com/0431989df4836eb82bdac0cc53c7f3d6

	# Used in https://youtu.be/R6OeIgb7lUI

	##############################
	# Flux 2 With GitOps Toolkit #
	##############################

	# What Is GitOps And Why Do We Want It?: https://youtu.be/HKkhD6nokC8
	# Argo CD: Applying GitOps Principles To Manage Production Environment In Kubernetes: https://youtu.be/vpWQeoaiRM4

	# stop all processes
	docker stop $(docker ps -aq)

	# remove all containers
	docker rm $(docker ps -aq)

	# remove all images
	docker rmi $(docker images -aq)

	# delete all volumes

	##################################################
	### Elasticsearch host name
	ES_HOST = "search-******************.ap-northeast-1.es.amazonaws.com"

	### Elasticsearch prefix for index name
	INDEX_PREFIX = "elb_log"

	### ELB name for type name
	ELB_NAME = "*****"


	Questions are not from any actual exam!!!



	Q: Create a job that calculates pi to 2000 decimal points using the container with the image named perl
	and the following commands issued to the container: ["perl", "-Mbignum=bpi", "-wle", "print bpi(2000)"]
	Once the job has completed, check the logs to and export the result to pi-result.txt.

	Solution:

	# -- mode: ruby --
	# vi: set ft=ruby :

	# This script to install Kubernetes will get executed after we have provisioned the box
	$script = <<-SCRIPT

	# Install kubernetes
	apt-get update && apt-get install -y apt-transport-https
	curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg \| apt-key add -
	cat <<EOF >/etc/apt/sources.list.d/kubernetes.list