Walter Behmann WalBeh

Setup droplet as Gateway

This might be useful to have k8s nodes without having a public ip address, to simulate an internal network (private IP/LAN) setup

Following: https://docs.digitalocean.com/products/networking/vpc/resources/droplet-as-gateway/

on the worker

k3s

as of 01/06/2021: you have to use ubuntu 18. Seems like ubuntu 20 has an incompatible iptables version. You can verify that after setting up k3s, by running k3s check check-config. Whats the problem? Thou it seems to work, I run into the situation where DNS lookups timed out. To verify that your output should look like this.

kubectl apply -f https://k8s.io/examples/admin/dns/dnsutils.yam
root@ub1:~# kubectl exec -i -t dnsutils -- nslookup kubernetes.default
Server:		10.43.0.10
Address:	10.43.0.10#53

cratedb Index/Partitions/Shards

This document aims to give some general understand and guidance on some topics for cratedb in the context of our IoT use-case with timeseries data. Where possible sample numbers from the c-holistic-comparision pitch are added for the purpose of illustration:

Indices and how cratedb analises the OBJECT type.
Cardinality of the data and why it is important to understand it.
Some basic undertanding of paritioning.
Sharding Sizes and basic numbers of thumb.
At the end there is FAQ with information and links about Lucene indices in general.
What todo with the vast amount of data you are probably inserting

Performance Tests

The purpose of the tests is to get a better understanding of the capabilities of a Azure premium managed disk. Our primary focus are the metrics of a singel disk. As we are using them to claim persistent volumes for our k8s environment.

Typically one would create several disk and "bundle" them together via a "stipe set" to get better results. For k8s env. this is not an option. Unless you use a custom storageclass provider.

fio

Keybase proof

I hereby claim:

I am walbeh on github.
I am walterb (https://keybase.io/walterb) on keybase.
I have a public key ASAbJuaFnwCLzXtmadhFNFJZBdSDukvnAWMDpN2M7_AC5go

To claim this, I am signing this object:

	#!/usr/bin/env python
	# https://github.com/Azure/azure-event-hubs-python

	"""
	An example to show batch sending events to an Event Hub.
	"""

	# pylint: disable=C0111

	import sys