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Showing content from https://github.com/k8s-client/client below:

k8s-client/client: A Kubernetes client for PHP.

k8s-client is a Kubernetes API client for PHP.

HTTP Client agnostic (supports any PSR-18 compatible HTTP Client)
Supports all major API operations (read, watch, list, patch, delete, exec, attach, logs, port-forward, proxy, etc)
Supports all Kinds from the Kubernetes API (via auto-generated Kind models with annotations and type-hints).
Pluggable websocket adapter support (For executing commands in pods, attaching, port-forwarding, etc)

The Kind models are auto-generated nightly for the last 10 versions of the Kubernetes API.

Install using composer:

# Install the base client
composer require k8s/client

# Plan on using the Symfony HttpClient? Install the auto-configuration helper for it.
composer require k8s/http-symfony

# Plan on needing to use things like executing commands, port-forwarding?
# Install a websocket adapter.
composer require k8s/ws-ratchet

This library requires a PSR-18 compatible HTTP Client, such as Guzzle or Symfony's HttpClient. It can also be given a PSR-16 compatible Simple Cache implementation to help speed up the library.

Using a Specific Kubernetes API version

Each Kubernetes version may have different resources and operations. If you require a specific version, then you can require the version of the k8s/api library that you need to use. That library contains all the API specific versions and models that are consumed by this library.

For instance, to use API version 1.18:

composer require k8s/api:"~1.18.0"

Note: The version of k8s/api does not exactly reflect the version of the Kubernetes API. The patch version of Kubernetes may not be the same as the k8s/api patch version.

Installing a Websocket Adapter

Certain Kuberenetes API endpoints (such as exec, to run commands in a container) require websockets to communicate. If you need support for this, install one of these adapters:

ReactPHP based websocket adapter (https://github.com/k8s-client/ws-ratchet):
- composer require k8s/ws-ratchet
Swoole based websocket adapter (https://github.com/k8s-client/ws-swoole):
- composer require k8s/ws-swoole

See each library's readme for more configuration information.

Constructing the Client Automatically

The easiest way to construct the client is from a pre-defined KubeConfig:

use K8s\Client\K8sFactory;

# Attempt to load the default kubeconfig file:
$k8s = (new K8sFactory())->loadFromKubeConfig();

# Attempt to load a specific kubeconfig file from a full file path:
$k8s = (new K8sFactory())->loadFromKubeConfigFile('/my/special/.kube/config');

# Load a kubeconfig from string kubeconfig data:
$k8s = (new K8sFactory())->loadFromKubeConfigData($kubeConfigData);

Note: This requires the use of an HttpClient factory helper. Install one of these packages:

k8s/http-symfony (Symfony based HttpClient)
k8s/http-guzzle (Guzzle based HttpClient)

Constructing the Client Manually

Construct the client with your needed options:

use K8s\Client\K8s;
use K8s\Client\Options;

# Supply the base path to the Kubernetes API endpoint:
$options = new Options('https://127.0.0.1:8443');
# To use an API token for authentication, set it in the options:
$options->setToken('some-secret-token-value-goes-here');

$k8s = new K8s($options);

Note: If you need to perform certificate based authentication, check the options for the HttpClient you are using. Also check the configuration for the websocket adapter you are using.

use K8s\Api\Model\Api\Core\v1\Pod;
use K8s\Client\K8sFactory;

$k8s = (new K8sFactory())->loadFromKubeConfig();

/** @var Pod $pod */
foreach ($k8s->listAll(Pod::class) as $pod) {
    echo sprintf(
        "%s\t%s\t%s",
        $pod->getPodIP(),
        $pod->getNamespace(),
        $pod->getName()
    ) . PHP_EOL;
}

Watch all Deployments in a Namespace

use K8s\Api\Model\Api\Apps\v1\Deployment;
use K8s\Api\Model\ApiMachinery\Apis\Meta\v1\WatchEvent;
use K8s\Client\K8sFactory;

$k8s = (new K8sFactory())->loadFromKubeConfig();

$count = 0;

# This will watch all deployments in the default namespace.
# Change the namespace either in the Options above or as a parameter to the watchNamespaced method below.
$k8s->watchNamespaced(function (WatchEvent $event) use (&$count) {
    $count++;

    /** @var Deployment $object */
    $object = $event->getObject();
    echo sprintf(
            "%s\t%s\t%s\t%s",
            $event->getType(),
            $object->getName(),
            $object->getReplicas(),
            implode(',', (array)$object->getLabels())
        ) . PHP_EOL;
    
    # Return false if some condition is met to stop watching.
    if ($count >= 5) {
        return false;
    }
}, Deployment::class);

Using model classes:

use K8s\Api\Model\Api\Core\v1\Container;
use K8s\Api\Model\Api\Core\v1\Pod;
use K8s\Client\K8sFactory;

$k8s = (new K8sFactory())->loadFromKubeConfig();

# Create a pod with the name "web" using the nginx:latest image...
$pod = new Pod(
    'web',
    [new Container('web', 'nginx:latest')]
);

# Create will return the updated Pod object after creation in this instance...
$pod = $k8s->create($pod);

var_dump($pod);

Using array data:

use K8s\Client\K8sFactory;

$k8s = (new K8sFactory())->loadFromKubeConfig();

# Create a pod with the name "web" using the nginx:latest image...
# Create will return the updated Pod object after creation in this instance...
$pod = $k8s->create($k8s->newKind([
    'apiVersion' => 'v1',
    'kind' => 'Pod',
    'metadata' => [
        'name' => 'web',
    ],
    'spec' => [
        'containers' => [
            [
                'image' => 'nginx:latest',
                'name' => 'web',
            ],
        ]
    ],
]));

var_dump($pod);

Using model classes:

use K8s\Api\Model\Api\Apps\v1\Deployment;
use K8s\Api\Model\ApiMachinery\Apis\Meta\v1\LabelSelector;
use K8s\Api\Model\Api\Core\v1\Container;
use K8s\Api\Model\Api\Core\v1\PodTemplateSpec;
use K8s\Client\K8sFactory;

$k8s = (new K8sFactory())->loadFromKubeConfig();

# All deployments need a "template" that describes the Pod spec
$template = new PodTemplateSpec(
    'frontend',
    [new Container('frontend', 'nginx:latest')]
);

# The template must have a label that matches the label selector below
$template->setLabels(['app' => 'web']);

# Create a deployment called "frontend" with the given template.
$deployment = new Deployment(
    'frontend',
    new LabelSelector([], ['app' => 'web']),
    $template
);

$result = $k8s->create($deployment);

# Create for a deployment will return a Status object for the creation
var_dump($result);

Using array data:

use K8s\Client\K8sFactory;

$k8s = (new K8sFactory())->loadFromKubeConfig();

# Create a deployment with the given array data matching what you want.
$result = $k8s->create($k8s->newKind([
    'apiVersion' => 'apps/v1',
    'kind' => 'Deployment',
    'metadata' => [
        'name' => 'frontend',
        'labels' => [
            'app' => 'web',
        ]
    ],
    'spec' => [
        'selector' => [
            'matchLabels' => [
                'app' => 'web',
            ]
        ],
        'template' => [
            'metadata' => [
                'labels' => [
                    'app' => 'web',
                ]
            ],   
            'spec' => [
                'containers' => [
                    [
                        'image' => 'nginx:latest',
                        'name' => 'frontend',
                    ],
                ],
            ],
        ],
    ],
]));

# Create for a deployment will return a Status object for the creation
var_dump($result);

Proxy HTTP requests to a Pod

The proxy method sends an HTTP request to a path of a pod, service, or node. It makes no assumptions about what type of HTTP request you want to send, so it accepts a standard PSR-7 RequestInterface and returns a ResponseInterface.

use Http\Discovery\Psr17FactoryDiscovery;
use K8s\Api\Model\Api\Core\v1\Pod;
use K8s\Client\K8sFactory;

$k8s = (new K8sFactory())->loadFromKubeConfig();

# Get the pod you want to proxy to first
$pod = $k8s->read('web', Pod::class);

# Create the HTTP request you'd like to send to it
$requestFactory = Psr17FactoryDiscovery::findRequestFactory();
$request = $requestFactory->createRequest('GET', '/');

# Send the request to proxy, dump the results
# The result will be the raw PSR-7 ResultInterface class.
$result = $k8s->proxy($pod, $request);

echo (string)$result->getBody().PHP_EOL;

use K8s\Client\K8sFactory;

$k8s = (new K8sFactory())->loadFromKubeConfig();

# Read logs from a pod called "web".
# Also append all log entries with a timestamp (ISO8601)
$log = $k8s->logs('web')
    ->withTimestamps()
    ->read();

var_dump($log);

use K8s\Client\K8sFactory;

$k8s = (new K8sFactory())->loadFromKubeConfig();

$count = 0;

# Follow logs from a pod called "web".
# Also append all log entries with a timestamp (ISO8601)
$k8s->logs('web')
    ->withTimestamps()
    ->follow(function (string $log) use (&$count) {
        $count++;
        var_dump($log);

        # Return false at any point to stop following the logs.
        if ($count >= 5) {
            return false;
        }
    });

Execute a command in a Pod container

use K8s\Client\K8sFactory;

$k8s = (new K8sFactory())->loadFromKubeConfig();

# Print the result of "whoami".
$k8s->exec('web', '/usr/bin/whoami')
    ->useStdout()
    ->run(function (string $channel, string $data) {
        echo sprintf(
            '%s => %s',
            $channel,
            $data
        ) . PHP_EOL;
    });

Attach to the running process of a container in a Pod

use K8s\Client\K8sFactory;

$k8s = (new K8sFactory())->loadFromKubeConfig();

# Attaches to the main running process of the container in the Pod
$k8s->attach('my-pod')
    # You must specify at least one of useStdout(), useStderr(), useStdin()
    ->useStdout()
    # Prints out any STDOUT from the main running process
    # Can also pass it an instance of ContainerExecInterface
    ->run(function (string $channel, string $data) {
        echo sprintf(
            "%s => %s",
            $channel,
            $data
        ) . PHP_EOL;
    });

use K8s\Api\Model\Api\Apps\v1\Deployment;
use K8s\Client\Patch\JsonPatch;
use K8s\Client\K8sFactory;

$k8s = (new K8sFactory())->loadFromKubeConfig();

$patch = new JsonPatch();
# Since labels are an array, this actually replaces existing labels
$patch->add('/metadata/labels', ['app' => 'web']);
# Replaces the current replica value with 2
$patch->replace('/spec/replicas', 2);

# We first need to read the deployment we want to patch.
$deployment = $k8s->read('frontend', Deployment::class);
# Now we patch the deployment using the patch object. The returned value will be the updated deployment.
$deployment = $k8s->patch($deployment, $patch);

echo sprintf(
    'Replicas: %s, Labels: %s',
    $deployment->getReplicas(),
    implode(',', $deployment->getLabels())
) . PHP_EOL;

use K8s\Client\K8sFactory;

$k8s = (new K8sFactory())->loadFromKubeConfig();

$k8s->uploader('my-pod')
    # Add files from paths.
    # The first argument is the source location, the second is the destination for it on the container.
    ->addFile('/path/to/local/file.txt', '/tmp/file.txt')
    # Add files from string data.
    # The first argument is the destination path on the container. The second is the file contents as a string.
    ->addFileFromString('/tmp/hi.txt', 'Oh, hi Mark.')
    # This actually initiates the upload process.
    ->upload();

Download Files from a Pod

use K8s\Client\K8sFactory;

$k8s = (new K8sFactory())->loadFromKubeConfig();

$archive = $k8s->downloader('my-pod')
    # Optionally choose to compress the downloaded files (gzip -- tar.gz)
    ->compress()
    # The file(s) or directory to download. Can be an array of files, or just a single directory or file.
    ->from('/etc')
    # If you don't specify to() it will download to a temp file.
    ->to(__DIR__ . '/' . 'podFiles.tar.gz')
    # Initiate the download process.
    ->download();

# The full path to the downloaded files archive..
echo (string)$archive . PHP_EOL;
# Extract the downloaded files to a directory called "podFiles" in the current directory..
mkdir(__DIR__ . '/podFiles');
$archive->extractTo(__DIR__ . '/podFiles');

Port Forwarding from a Pod

Note: The below example assumes a pod called portforward-example exists with port 80 serving HTTP (such as a base nginx image).

Create a class that reacts to port forwarding events:

namespace App;

use K8s\Client\Websocket\Contract\PortChannelInterface;
use K8s\Client\Websocket\Contract\PortForwardInterface;
use K8s\Client\Websocket\PortChannels;

class PortForwarder implements PortForwardInterface
{
    /**
    * @var PortChannels
    */
    private $portChannels;

    /**
    * @inheritDoc
    */
    public function onInitialize(PortChannels $portChannels) : void
    {
        $this->portChannels = $portChannels;

        # On initialize, send this HTTP request across.
        # Due to "Connection: close" HTTP instruction, the websocket will close after the response is received.
        # In a more realistic situation, you'd probably want to keep this open, and react in the onDataReceived method.
        $data = "GET / HTTP/1.1\r\n";
        $data .= "Host: 127.0.0.1\r\n";
        $data .= "Connection: close\r\n";
        $data .= "Accept: */*\r\n";
        $data .= "\r\n";

        $this->portChannels->writeToPort(80, $data);
    }

    /**
    * @inheritDoc
    */
    public function onDataReceived(string $data, PortChannelInterface $portChannel) : void
    {
        echo sprintf(
            'Received data on port %s:',
            $portChannel->getPortNumber()
        ) . PHP_EOL;
        echo $data . PHP_EOL;
    }

    /**
    * @inheritDoc
    */
    public function onErrorReceived(string $data, PortChannelInterface $portChannel) : void
    {
        echo sprintf(
            'Received error on port %s: %s',
            $portChannel->getPortNumber(),
            $data
        ) . PHP_EOL;
    }
    
    /**
    * @inheritDoc
    */
    public function onClose() : void
    {
        # Do something here to clean-up resources when the connection is closed...
    }
}

Use the above class as a handler for the port forward process:

use App\PortForwarder;
use K8s\Client\K8sFactory;

$k8s = (new K8sFactory())->loadFromKubeConfig();

$handler = new PortForwarder();
# Assuming a Pod with a basic HTTP port 80 exposed...
$k8s->portforward('portforward-example', 80)
    ->start($handler);

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