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GCP Add New Route

Here’s how to add a new route in Google Cloud Platform.

gcloud compute routes create name-of-new-route \
  --destination-range=200.20.0.0/15 \
  --next-hop-gateway=default-internet-gateway \
  --project=host-project \
  --network="default" \
  --priority=900

Adding Domains in Certbot

You can register multiple domains to a single SSL certificate. This is particularly useful if you are hosting multiple domains on one server. This command adds more domains to your existing certificate.

certbot --expand -d existing.com -d newdomain1.com -d newdomain2.com

Check if the domains were added.

certbot certificates

Certbot certificates are valid for 90 days, but they automatically renew themselves if expiration is less than 30 days. If you need to renew manually for some odd reason, you can run this command. You can also perform a dry-run before renewing.

certbot renew
certbot renew --dry-run

AWS EFS Tags

This script add new tags if they are missing.

#!/bin/bash
log="log.txt"
id=$(aws efs describe-file-systems --query "FileSystems[*].[FileSystemId]" --output text --region us-east-1)
tag=$(aws efs describe-file-systems --query "FileSystems[*].Tags[?Key=='aws-backup'].Value" --output text --region us-east-1 )
 
arr[0]="efs-0000"
arr[1]="efs-0400"
arr[2]="efs-0800"
arr[3]="efs-1200"
arr[4]="efs-1600"
arr[5]="efs-2000"
 
rand=$[ $RANDOM %6 ]
backup=${arr[$rand]}
 
if [[ $tag == "" ]]; then
  aws efs tag-resource --resource-id $id --tags Key="aws-backup",Value=${arr[$rand]} --profile default --region us-east-1
  echo "Added backup tag $backup to $id" 
elif [[ $tag == "no-backup" ]]; then
  echo "No backup on $id."
else
  echo "No changes done to $id."
fi

Add Existing User To A Group

Here’s how to add an existing user to a user group in Linux.

usermod -a -G groupname username
usermod -a -G www-data john

List all users belonging to a group.

lid -g www-data

List all the groups the user belongs to.

groups john

Git Bash Path

Here’s how to add or edit the PATH in Git Bash. Edit your bash_profile.

vi ~/.bash_profile

Set your path by adding the new path at the end. 

PATH="/c/WINDOWS/system32:/c/Users/firstname.lastname/google-cloud-sdk/bin"

The example path listed above is truncated for brevity.