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# maximum capability of system
user@ubuntu:~$ cat /proc/sys/fs/file-max
708444

# available limit
user@ubuntu:~$ ulimit -n
1024

# To increase the available limit to say 200000
user@ubuntu:~$ sudo vim /etc/sysctl.conf

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# Handling CORS headers for handling cross-origin requests example
# See https://developer.mozilla.org/en/docs/Web/HTTP/CORS
# TODO: check if origin is set. If missing then do not add CORS headers
# TODO: handle ports in origin

# check if origin header is among allowed ones
map $http_origin $cors_origin {
    hostnames;

    # all domains and subdomains for my-site.com or *.my-site.com can request contents

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Kubectl output options

Let's look at some basic kubectl output options.

Our intention is to list nodes (with their AWS InstanceId) and Pods (sorted by node).

We can start with:

kubectl get no

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export TERM="xterm-256color" # This sets up colors properly

# workaround as per https://superuser.com/questions/1222867/zsh-completion-functions-broken
FPATH=$HOME/.oh-my-zsh/plugins/git:$HOME/.oh-my-zsh/functions:$HOME/.oh-my-zsh/completions:/usr/share/zsh/site-functions:/usr/share/zsh/$ZSH_VERSION/functions

export FPATH

# set shell
export SHELL=/usr/bin/zsh

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Kubernetes Commands

Helper setup to edit .yaml files with Vim:

• VIM Setup for Yaml files

List of general purpose commands for Kubernetes management:

• PODS
• Create Deployments

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#!/usr/bin/env bash

# https://docs.docker.com/install/linux/docker-ce/ubuntu/
sudo apt-get install apt-transport-https ca-certificates curl software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable"
sudo apt-get update
sudo apt-get install docker-ce

# https://docs.docker.com/compose/install/

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dd-udpstream

Parse json events into data dog events

Testing