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Simple Page Navigation

const puppeteer = require('puppeteer');

const url = 'https://foo/bar';

(async () => {
  const browser = await puppeteer.launch({
 headless: false

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Agility

Improvement Kata

The improvement kata is a routine for moving from the current situation to a new situation in a creative, directed, meaningful way. It is based on a four-part model:

1. In consideration of a vision or direction...
2. Grasp the current condition.
3. Define the next target condition.
4. Move toward that target condition iteratively, which uncovers obstacles that need to be worked on.

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Networking

Network Tests/ Debugging

• ICMP traceroute sudo mtr -rw google.de
• TCP traceroute sudo mtr -P 80 -i 0.5 -rwc 50 google.de

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Redis Knowledge

• dbsize Print all keys in DB (incl. already expired keys)
• list all keys redis-cli --scan --pattern '*' -h <redis-url>
• debug populate 33 populate redis cluster with elements

Redis is single threaded! Check for blocking commands like keys *

Redis SCAN vs. KEYS Command

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Mongodb

Backup and restore

• If target container is not in the default network the argument --network <my-docker-network-name> has to be used with docker command.

Backup

docker run --rm --init --user 0 -v ${PWD}:/backups --link <mongodb-container-id>:src-mongodb mongo:4-xenial /bin/bash -c 'mongodump -h src-mongodb:27017 --db movie-favs --gzip --archive=/backups/$(date +"%d-%m-%Y")-mongodb.archive.gz'

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macOS

System Preferences

Toggle automatic software updates

sudo softwareupdate --schedule <off|on>

Change various Preferences

• usage defaults usage
• list all config domains defaults domains |tr ‘,’ '\n’

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CORS PreFlight Request

http --follow --verbose OPTIONS http://localhost:1337/ Access-Control-Request-Method:GET Access-Control-Request-Headers:X-Requested-With Origin:localhost

Test TLS Connection

openssl s_client -tls1_2 -connect google.com:443