Michael A. Aurora12

## 2-list-containers.sh
# All entites in k8s can be inspected with describe
kubectl -n $NAMESPACE describe pod $POD

## 1-get-pod.sh
# All entities in k8s can be listed with get
kubectl -n $NS get pod

## 0-get-context.sh
gcloud container clusters get-credentials $CLUSTER --zone europe-west2-a --project $PROJECT

kubectl config get-clusters
echo Current context: $(kubectl config current-context)
kubectl get ns

## mac-tar.md

      
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                Tar/Zip without macOS rubbish
              
          
    TAR

--disable-copyfile stops AppleDouble ._ files with extended OS info from being tarred.
tar --disable-copyfile -cvzf ./target.tar.gz ./something
ZIP


## change-node.md

      
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                Change Node version on macOS
              
          
    Switching between Node.js version on macOS and pinning the one installed.
# Node 12 -> 14
brew unpin node@12
brew uninstall --force --ignore-dependencies node
brew install node@14
brew pin node@14

# Node 14 -&gt; 12


## do-setup.md

      
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                Setup DigitalOcean
              
          
    Steps


Dependencies
Firewall
Sudo user
Ssh key
Nginx
DNS
LetsEncrypt certificate
Nginx configuration


## docker-pg-dump.md

      
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                Dump a PostgreSQL database running in a Docker container
              
          
    Bash to a running docker container, dump Postrgres, copy the dump from the container, restore it to a local db.
# Get the name of the container
docker ps

# Bash to it
docker exec -it <DB CONTAINER NAME> /bin/bash

# Create a compressed dump

  
## basic_email_validation.go
import (
	"regexp"
)

// The original W3C email regular expression taken from:
// https://html.spec.whatwg.org/multipage/input.html#email-state-(type=email)
// It is modified to include a domain zone at the end (in JavaScript it works fine without modifications).
// This expression doesn't support addresses with UTF characters.
var emailRegex = regexp.MustCompile("^[a-zA-Z0-9.!#$%&'*+\\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*\\.[a-zA-Z]{2,}$")

## get-db.sh
```bash
# Get credentials from GCP
gcloud container clusters get-credentials $CLUSTER --zone $ZONE --project $PROJECT
echo Current context: $(kubectl config current-context)

SOURCE="<POD>:/tmp/dump.sql"
TARGET="./$CLUSTER.dump.compressed.sql"

# Create a dump inside a container running in k8s
kubectl exec -n $NAMESPACE --stdin --tty $POD -c $CONTAINER -- pg_dump -f /tmp/dump.sql -F c -Z 9 -U <USER> <DATABSE>

## pg.sql
to_timestamp(timestamp_in_milliseconds::numeric/1000)
	# All entites in k8s can be inspected with describe
	kubectl -n $NAMESPACE describe pod $POD
	# All entities in k8s can be listed with get
	kubectl -n $NS get pod
	import (
	"regexp"
	)

	// The original W3C email regular expression taken from:
	// https://html.spec.whatwg.org/multipage/input.html#email-state-(type=email)
	// It is modified to include a domain zone at the end (in JavaScript it works fine without modifications).
	// This expression doesn't support addresses with UTF characters.
	var emailRegex = regexp.MustCompile("^[a-zA-Z0-9.!#$%&'+\\/=?^_`{\|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)\\.[a-zA-Z]{2,}$")
	```bash
	# Get credentials from GCP
	gcloud container clusters get-credentials $CLUSTER --zone $ZONE --project $PROJECT
	echo Current context: $(kubectl config current-context)

	SOURCE="<POD>:/tmp/dump.sql"
	TARGET="./$CLUSTER.dump.compressed.sql"

	# Create a dump inside a container running in k8s
	kubectl exec -n $NAMESPACE --stdin --tty $POD -c $CONTAINER -- pg_dump -f /tmp/dump.sql -F c -Z 9 -U <USER> <DATABSE>