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set -e, -u, -x, -o pipefail

The set lines

These lines deliberately cause your script to fail. Wait, what? Believe me, this is a good thing.
With these settings, certain common errors will cause the script to immediately fail, explicitly and loudly. Otherwise, you can get hidden bugs that are discovered only when they blow up in production.

set -euxo pipefail is short for:

set -e
set -u

Steps to install BCC and bpftrace from source on Ubuntu 18.04.

BCC

Install build dependencies

sudo apt-get -y install bison build-essential cmake flex git libedit-dev \
  libllvm6.0 llvm-6.0-dev libclang-6.0-dev python zlib1g-dev libelf-dev \
 iperf3 luajit libluajit-5.1-dev netperf linux-headers-$(uname -r)

Kafka Topics

List existing topics

bin/kafka-topics.sh --zookeeper localhost:2181 --list

Purge a topic

bin/kafka-topics.sh --zookeeper localhost:2181 --alter --topic mytopic --config retention.ms=1000

... wait a minute ...

bin/kafka-topics.sh --zookeeper localhost:2181 --alter --topic mytopic --delete-config retention.ms

My Elasticsearch cheatsheet with example usage via rest api (still a work-in-progress)

Shortlinks:

Cluster Health
- Index Level
- Shard Level
Nodes Overview
Indices Overview
Cluster Maintenance

Elasticsearch Cheat Sheet

Populating this as we dig further into the platform, hopefully it'll be as useful to you as it is to use.

When you need to reboot at least one node
Explain why a shard is unallocated
Fix an unallocated primary shard
Turn off replication for an index
Set transaction log (TRANSLOG) size

On master and nodes

Pull images form internet access laptop

docker pull gcr.io/google_containers/kube-apiserver-amd64:v1.5.0
docker pull gcr.io/google_containers/kube-controller-manager-amd64:v1.5.0
docker pull gcr.io/google_containers/kube-proxy-amd64:v1.5.0
docker pull gcr.io/google_containers/kube-scheduler-amd64:v1.5.0
docker pull weaveworks/weave-npc:1.8.2
docker pull weaveworks/weave-kube:1.8.2

	#!/bin/bash -e

	# Setup a Root CA in vault
	# Generate and sign an Intermediate cert
	#
	# Requires:
	# * A running vault server already initialzed and unsealed
	# * Environment variable VAULT_TOKEN is set
	# * vault cli (https://www.vaultproject.io)
	# * httpie (https://github.com/jkbrzt/httpie)

	package main

	import (
	"bufio"
	"encoding/json"
	"fmt"
	"net/url"
	"net/http"
	"os"
	"time"

	yum install wget
	wget https://yum.dockerproject.org/repo/main/centos/7/Packages/docker-engine-1.13.1-1.el7.centos.x86_64.rpm
	wget https://yum.dockerproject.org/repo/main/centos/7/Packages/docker-engine-selinux-1.13.1-1.el7.centos.noarch.rpm

	#nice site with pckgs: https://pkgs.org/

	#package for docker-engine-selinux
	yum install -y policycoreutils-python
	rpm -i docker-engine-selinux-1.13.1-1.el7.centos.noarch.rpm

	apiVersion: kops/v1alpha2
	kind: Cluster
	metadata:
	name: kube.kamilhristov.com
	spec:
	cloudProvider: aws
	etcdClusters:
	- etcdMembers:
	- instanceGroup: master-1
	name: master-1

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