Rajaneesh Rajaneeshs

Debugging Redis Keyspace Misses

Simply put, a keyspace "MISS" means some piece of data you tried to retrieve from Redis was not there. This usually means that one of the following things happened:

The key expired
They key was renamed
The key was deleted
The key was evicted due to memory pressure
The entire database was flushed
The key was never actually inserted

Create Root CA (Done once)

Create Root Key

Attention: this is the key used to sign the certificate requests, anyone holding this can sign certificates on your behalf. So keep it in a safe place!

openssl genrsa -des3 -out rootCA.key 4096

A curated list of AWS resources to prepare for the AWS Certifications

A curated list of awesome AWS resources you need to prepare for the all 5 AWS Certifications. This gist will include: open source repos, blogs & blogposts, ebooks, PDF, whitepapers, video courses, free lecture, slides, sample test and many other resources.

Link to these links: https://git.io/vKSVZ

Module 1:

Run jenkins from war file: jenkins -jar jenkins.war
Run jenkins from docker:

docker run -d \
           --restart unless-stopped \
           --name jenkins \

Humans build and fix systems.
Humans get tired and stressed, they feel happy and sad.
Systems don't have feelings yet. They only have SLAs.
Humans need to switch off and on again.
The wellbeing of human operators impacts the reliability of systems.
Alert Fatigue == Human Fatigue
Automate as much as possible, escalate to a human as a last resort.
Document everything. Train everyone. Save time.
Kill the shame game.
Human issues are system issues.

Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)

$ docker volume ls -qf dangling=true | xargs -r docker volume rm

boto3 quick hands-on

This documentation aims at being a quick-straight-to-the-point-hands-on AWS resources manipulation with [boto3][0].

First of all, you'll need to install [boto3][0]. Installing it along with [awscli][1] is probably a good idea as

[awscli][1] is boto-based
[awscli][1] usage is really close to boto's

Here are several different ways to test a TCP port without telnet.

BASH (man page)

$ cat < /dev/tcp/127.0.0.1/22
SSH-2.0-OpenSSH_5.3
^C

$ cat &lt; /dev/tcp/127.0.0.1/23

	sudo apt-get update
	sudo apt-get install -y python-pip
	sudo pip install awscli

	aws configure # enter credentials for a user with full s3,ec2 access / admin access

	export KUBERNETES_PROVIDER=aws
	export KUBE_AWS_ZONE=us-west-2a
	export KUBE_AWS_INSTANCE_PREFIX=k8s
	export KUBE_MINION_IMAGE=ami-9abea4fb # Ubuntu server 14.04

	#!/bin/sh

	# Use AWS CLI to get the most recent version of an AMI that
	# matches certain criteria. Has obvious uses. Made possible via
	# --query, --output text, and the fact that RFC3339 datetime
	# fields are easily sortable.

	export AWS_DEFAULT_REGION=us-east-1

	aws ec2 describe-images \