Uly.me

cloud engineer

Archives for April 2022

GCP Find Instance Boot Disk

How to find a boot disk from an instance.

gcloud compute instances describe servername \
--format='get(disks[0].source)' \
--zone=us-central1-c \
--project project-id

Result

https://www.googleapis.com/compute/v1/projects/project-id/zones/us-central1-f/disks/servername-boot

7zip in Mac OS

Install

brew install p7zip

Extract

7z x file.7z

Compress

7z a file.7z mydirectory

Remove Extended Attributes on Mac

If you have a file with @ sign at end, this is how to remove extended attributes on the Mac OS.

Example.

ls -l
-rwxr-xr-x@  4 username  staff   128 Mar 24 10:51 sample.txt

Remove extended attributes.

xattr -c sample.txt

Result

ls -l
-rwxr-xr-x  4 username  staff   128 Mar 24 10:51 sample.txt

GCP Backup Instance

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

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