savadev

#
# cqlsh_intro.cql
#
# Copyright (C) 2017 Jeff Carpenter
# Execute the commands in this file for a short guided tour of the CQL Shell (cqlsh)
#
# For more description, see Cassandra, The Definitive Guide 2nd Ed., Chapter 3: Installing
# http://shop.oreilly.com/product/0636920043041.do
#

savadev

Configure audit logging & troubleshooting containerd-based kubeadm

First, we'll need a VM. In one simple command, you can create a VM in azure and pass a cloud-init script that will install containerd and kubeadm, and will deploy a single node Kubernetes cluster:

wget https://gist.githubusercontent.com/ams0/0e57d15d53782c2c2259cce8545caa70/raw/d4e0686e4dc068ea146717af5d5a7be3dab97a4c/kubeadm-containerd.sh

az group create -n cks
az vm create -g cks -n cks --image  UbuntuLTS --ssh-key-values ~/.ssh/id_rsa.pub --admin-username cks --size Standard_B4ms --custom-data kubeadm-containerd.sh

savadev

<!DOCTYPE NETSCAPE-Bookmark-file-1>
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     DO NOT EDIT! -->
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
<TITLE>Bookmarks</TITLE>
<H1>Bookmarks</H1>
<DL><p>
    <DT><H3 ADD_DATE="1606081399" LAST_MODIFIED="1606237173" PERSONAL_TOOLBAR_FOLDER="true">Bookmarks Bar</H3>
    <DL><p>

savadev

<!DOCTYPE NETSCAPE-Bookmark-file-1>
<!-- This is an automatically generated file.
     It will be read and overwritten.
     DO NOT EDIT! -->
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
<TITLE>Bookmarks</TITLE>
<H1>Bookmarks</H1>
<DL><p>
    <DT><H3 ADD_DATE="1579618265" LAST_MODIFIED="1582022136" PERSONAL_TOOLBAR_FOLDER="true">Bookmarks Bar</H3>
    <DL><p>

savadev

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:

savadev

layout	title	description	tags
default	SQL Style Guide	A guide to writing clean, clear, and consistent SQL.	data process

Purpose

savadev

#List traversal
range(start, stop, hop)
range(n) # [0,1,...,n-1]
range(1,n) # [1,...,n-1]
range(1,n,2) # [1,3,5,...,n-1] if n is even, or [1,3,5,...,n-2] if n is odd
range(n,-1,-1) # [n,n-1,n-2,...,0]
range(len(arr)) # Provides indices of an array arr
range(len(arr)-1,-1,-1) # Provides indices of arr backwards

# List slicing

savadev

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

savadev

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

savadev

Tools

• Kops https://github.com/kubernetes/kops/blob/master/docs/README.md
• Kubectl https://kubernetes.io/docs/tasks/tools/install-kubectl/
• kubespy https://blog.pulumi.com/kubespy-trace-a-real-time-view-into-the-heart-of-a-kubernetes-service
• kops https://icicimov.github.io/blog/virtualization/Kubernetes-Cluster-in-AWS-with-Kops/

Presentations