Uly.me

cloud engineer

GCP Backup Instance

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Here’s the script to backup GCP disks.

#!/bin/bash
now=$(date +%s)
disks=$(gcloud compute disks list --project project-id --filter="users:instance" --format="value(name)")
for disk in $disks
do
  gcloud compute disks snapshot $disk \
  --snapshot-names=$disk-$now \
  --zone=us-central1-a \
  --project=project-id \
  --async
done

Vi Search and Replace

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How to do search and replace in Vim.

Search for “foo” and replace it with “bar” in the current line. Use :s

:s/foo/bar/g

Search for “foo” and replace it with “bar” in the entire document. Use :%s

:%s/foo/bar/g

You can also pipe instead of forward slash. Useful if your search contains a /.

:%s|foo/|bar|g

Redhat 8 Network Manager

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In Redhat 8, every time you the Network Manager get’s restarted it overwrites /etc/resolv.conf. To prevent that from hapenning, create a new file called /etc/NetworkManager/conf.d/90-dns-none.conf and add the following lines. Restart Network Manager. Your /etc/resolv.conf should be unchanged.

[main]
dns=none

Restart Network Manager

$ systemctl reload NetworkManager

GCP Project Quotas

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Here’s how to get your project quotas in GCP.

gcloud compute project-info describe --project your-project-id

GCP Regional Quotas

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Here’s how to get Regional Quotas for your project in GCP.

gcloud compute regions describe us-central1 --project your-project-id

Python Boto3 S3 List Objects

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How to list S3 objects using Python Boto3

import boto3
from sys import argv
bucket=argv[1]
s3 = boto3.resource('s3')
mybucket = s3.Bucket(bucket)
def list_buckets():
    print("List of Buckets: ")
    for bucket in s3.buckets.all():
        print(bucket.name)
def list_files():
    print("Buckets: The objects in the \"" + bucket + "\" buckets are ... ")
    for files in mybucket.objects.all():
        print(files.key)
def main():
    #list_buckets()
    list_files()
if __name__ == "__main__":
    main()

Running command

$ python test.py bucket-name    # with python
$ ./test.py bucket-name         # without python

Results

Buckets: The objects in the "bucket-name" are ....
abc.txt
def.txt

Python Virtual Environment

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How to create a Python virtual environment.

On Windows

$ pip install venv
$ python3 -m venv ~/python-test

On Ubuntu

$ sudo apt install python3.8-venv
$ python3 -m venv ~/python-test

On Mac OS

$ brew install virtualenv
$ virtualenv python-test

Activate

$ cd ~/python-test
$ source bin/activate

Deactivate

$ deactivate