jonashackt

# Show all processes that use a port
lsof -i 4tcp
# or
netstat -anvp tcp | awk 'NR<3 || /LISTEN/'

jonashackt

Check you're settings.xml (/Users/username/.m2/settings.xml), should look like this:

<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0                           http://maven.apache.org/xsd/settings-1.0.0.xsd">
  <localRepository>${user.home}/.m2/repository</localRepository>
  <interactiveMode>true</interactiveMode>
  <usePluginRegistry>false</usePluginRegistry>
  <offline>false</offline>
  <profiles>
    ...

jonashackt

Docker container, images, networks management is easy with the prune command which is available for all types of Docker artifacts (see https://stackoverflow.com/a/32723127/4964553 & https://docs.docker.com/config/pruning/#prune-images & https://docs.docker.com/engine/reference/commandline/system_prune/#filtering).

remove all local Docker containers, that are older than

docker container prune --filter "until=48h"

remove all local Docker images, that are older than

docker image prune -a --filter "until=2020-10-25"

run multiple commands with only one single docker run

jonashackt

# Go to last line
Crtl + Shift + _ 
Crtl V

# Delete whole line
Crtl + K

jonashackt

# Update Jekyll GitHub-Pages site
https://help.github.com/articles/setting-up-your-github-pages-site-locally-with-jekyll/#keeping-your-site-up-to-date-with-the-github-pages-gem

bundle update github-pages

# Test Jekyll with GitHub-Pages locally 
https://help.github.com/articles/setting-up-your-github-pages-site-locally-with-jekyll/#step-4-build-your-local-jekyll-site

bundle exec jekyll serve

jonashackt

k9s cheatsheet: https://www.hackingnote.com/en/cheatsheets/k9s/

CLI enhancements

https://discuss.kubernetes.io/t/kubectl-tips-and-tricks/192

krew as the Kubernetes CLI (kubectl) plugin manager helps to install all the tools: https://krew.sigs.k8s.io/

kubectl autocompletion

jonashackt

# 0. need root access to system

#### Show environment variables
printenv

#### Set env var
export FOO=BAR

#### Set env var for root 
# sudo export FOO=BAR doesnt work! (see https://askubuntu.com/questions/272637/i-have-a-problem-when-using-export-command)

pierrejoubert73

How to add a collapsible section in markdown

1. Example

Click me

Heading

1. Foo
2. Bar
   • Baz

• Qux

jonashackt

Start Powershell from cmd

start powershell

Resolve a DNS name:

Resolve-DnsName

Get PortMapping (e.g. if HNS error - object already exists occurs)

Get-NetNatStaticMapping

...and remove the failing PortMapping with (but LOOK, it goes through all mapping with the same NatName

- so if you only want to remove one, then just say Yes there)

mroderick

How to add an image to a gist

1. Create a gist if you haven't already.
2. Clone your gist:

   # make sure to replace `<hash>` with your gist's hash
   git clone https://gist.github.com/<hash>.git # with https
   git clone git@gist.github.com:<hash>.git     # or with ssh