Uly.me

cloud engineer

GCP Move VM to another VPC

Here’s how to move a VM to another VPC.

Stop VM.

gcloud compute instances stop $INSTANCE_NAME \
--zone $ZONE_NAME \
--project $PROJECT_ID

Move VM to another VPC.

gcloud compute instances network-interfaces update $INSTANCE_NAME \
--zone $ZONE_NAME \
--network-interface=nic0 \
--network $YOUR_NETWORK \
--subnetwork $YOUR_SUBNETWORK \
--project $PROJECT_ID

Start VM.

gcloud compute instances start $INSTANCE_NAME \
--zone $ZONE_NAME \
--project $PROJECT_ID

Git Reset File From Master

Here’s how to reset a file from the master branch.

git checkout origin/master test.py

This will undo your changes and matches what’s in the master repo.

Ajax Live Search

Just implemented an Ajax live search on a website.

Here’s the search page. Results are displayed in div output.

<script src="https://code.jquery.com/jquery-3.4.1.js"></script>
<script type="text/javascript">
$(document).ready(function(){
    $("#search").keyup(function(){
        var query = $(this).val();
        if (query != "") {
        $.ajax({
            url: 'links-ajax.php',
            method: 'POST',
            data: {query:query},
            success: function(data){
            $('#output').html(data);
            $('#output').css('display', 'block');
            $("#output a").on("click", function(){
                $("#output").val($(this).html());
            });
            $("#search").focusout(function(){
                window.setTimeout(function() {
                $('#output').css('display', 'none');
                }, 500);
            });
            $("#search").focusin(function(){
                $('#output').css('display', 'block');
            });
            }
        });
        } else {
        $('#output').css('display', 'none');
    }
    });
});
</script>
 
<div class="form-row">
    <div class="col">
        <input type="text" name="search" id="search" autocomplete="off" placeholder="Search here...." class="form-control form-control-success">
    </div>
</div>
<div id="output"></div>

Here’s the links-ajax.php which display the search results with links.

<?php
$servername='localhost';
$username='';
$password='';
$dbname = "";
$conn=mysqli_connect($servername,$username,$password,"$dbname");
if(!$conn) { die('Could not Connect MySql Server:' .mysql_error()); }
if (isset($_POST['query'])) {
    $query = <<<"SQL
                 SELECT * FROM links WHERE `name` LIKE '%{$_POST['query']}%' 
                 OR `url` LIKE '%{$_POST['query']}%' 
                 OR `tag` LIKE '%{$_POST['query']}%' 
                 ORDER BY name ASC, url ASC"
             SQL;
    $result = mysqli_query($conn, $query);
    if (mysqli_num_rows($result) > 0) {
        while ($user = mysqli_fetch_array($result)) {
            echo "<a target='_blank' rel="noopener">".$user['name']."</a><br/>";
        }
    } else {
        echo "<p style='color:red'>No results found...</p>";
    }
}
?>

I couldn’t get the links working, until I added the 500ms of timeout in .focusout.

Python Web Server

Here’s a quick way to start a web server using Python (not recommended for production).

If you want to use python3, you may have to use explicitly use python3.

Check what versions you have first.

python --version
python3 --version

Start web server using port 8080 in the current directory.

python -m http.server 8080

If you want an alternate directory, use this -d option.

python -m http.server 8080 -d /tmp

It’s a great tool for quick downloads.

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