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Keybase proof

I hereby claim:

• I am 2color on github.
• I am 2color (https://keybase.io/2color) on keybase.
• I have a public key whose fingerprint is EF85 B9E9 3F47 D488 56BF 37AF C466 A8FA 57F3 9905

To claim this, I am signing this object:

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# to generate your dhparam.pem file, run in the terminal
openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048

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Emoji	Meaning
⚠️	WIP
✅	Done
❌	Not Done
🎆	Serendipitous

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-- show running queries (pre 9.2)
SELECT procpid, age(query_start, clock_timestamp()), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(query_start, clock_timestamp()), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' 

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Client-side SSL

For excessively paranoid client authentication.

Using self-signed certificate.

Create a Certificate Authority root (which represents this server)

Organization & Common Name: Some human identifier for this server CA.

openssl genrsa -des3 -out ca.key 4096
openssl req -new -x509 -days 365 -key ca.key -out ca.crt

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• Get rid of pushgateway
• Saturation - Load testing to determine upper threshold (up 10 rq/sec)
• Imminent
• Should we use summeries
  • Historical
  • There might be situation where you don't care about aggregation
• Historgrams
  • Use up to 10 bukcets
  • Some use cases if you don't know the
• Aggregations, quantile, timewindow at query time

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Prometheus Questions

• metric names
  • Should the same metrics, e.g. requests_total be used across all http services or should one introduce a prefix for services?
  • What are the scaling considerations for an approach as the above
  • What if there's a load balancer and services where a request would be increase two counter, e.g. nginx_lb_requests_total and some_service_requests_total?
• Series churn
• When series churn happens and you have two time series, e.g. http_requests_total{code="200"} and http_requests_total{code="500"} are two new series created when the new prometheus container scrapes that target (not sure if same storage is mounted in k8s)?

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import styled from 'styled-components'
import themeVars from 'theme.variables'

const Button = styled.button`
  background-color: ${({theme}) => theme.button.backgroundColor};
  border: none;
  border-radius: ${({theme}) => theme.button.radius}px;
  color: white;
  cursor: pointer;
  padding: ${({theme}) => theme.button.padding}rem;

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import { Observable } from 'rxjs'
import 'rxjs/add/observable/of'
import 'rxjs/add/operator/map'
import 'rxjs/add/operator/merge'
import { createAction } from 'redux-actions'

export const SESSION_STORAGE_KEY = 'SESSION_STORAGE_KEY'

export const GET_SESSION_REQUESTED = 'payout/GET_SESSION_REQUESTED'
export const GET_SESSION_FOUND = 'payout/GET_SESSION_FOUND'

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Introduction to Node.js

Table of contents

• Understanding node
• Core modules
• Callbacks
• Events (not written yet)
• Streams (not written yet)
• Modules and NPM (not written yet)