What are the common Kubernetes operations in PHP programming?

Kubernetes is currently one of the most popular container orchestration systems. It provides powerful automated container management and deployment and is widely used in cloud computing, DevOps and other fields. As a common web programming language, PHP also has its specific operations in Kubernetes. This article will introduce some common Kubernetes operations in PHP programming.

1. Define Kubernetes service

In Kubernetes, service (service) is an abstract logical concept used to describe a group of Pods that share the same IP address and port number . By defining service objects, dynamic management of Pods can be achieved, such as load balancing, automatic service discovery, internal network communication, etc.

In PHP programming, you can use the Kubernetes API to create service objects, such as the following sample code:

<?php
require 'vendor/autoload.php';

use KubernetesClient;

$client = new Client([
    'master' => 'http://kubernetes-master:8080'
]);

$service = $client->services()->createService([
    'apiVersion' => 'v1',
    'kind' => 'Service',
    'metadata' => [
        'name' => 'my-service'
    ],
    'spec' => [
        'selector' => [
            'app' => 'my-app'
        ],
        'ports' => [
            [
                'name' => 'http',
                'protocol' => 'TCP',
                'port' => 80,
                'targetPort' => 80
            ]
        ],
        'type' => 'ClusterIP'
    ]
]);

echo "Service {$service['metadata']['name']} created
";

This code uses the KubernetesClient class to create a Kubernetes Client object, and then create a service object through the createService method. The service object includes some important properties, such as apiVersion, kind, metadata and spec, among which metadata Includes the name of the service, spec includes the configuration information of the service, such as port number, selector and type, etc.

2. Create Kubernetes deployment

Kubernetes deployment (deployment) is a container orchestration resource used to create and manage Pods. It can dynamically adjust the number and version of Pods to adapt Different load requirements and application scenarios. Typically, a deployment object corresponds to one or more Pod replicas to achieve high availability and fault tolerance.

In PHP programming, you can use the Kubernetes API to create deployment objects, such as the following sample code:

<?php
require 'vendor/autoload.php';

use KubernetesClient;

$client = new Client([
    'master' => 'http://kubernetes-master:8080'
]);

$deployment = $client->deployments()->createDeployment([
    'apiVersion' => 'apps/v1',
    'kind' => 'Deployment',
    'metadata' => [
        'name' => 'my-deploy'
    ],
    'spec' => [
        'selector' => [
            'matchLabels' => [
                'app' => 'my-app'
            ]
        ],
        'replicas' => 2,
        'template' => [
            'metadata' => [
                'labels' => [
                    'app' => 'my-app'
                ]
            ],
            'spec' => [
                'containers' => [
                    [
                        'name' => 'php-app',
                        'image' => 'my-images/php:latest',
                        'ports' => [
                            [
                                'containerPort' => 80
                            ]
                        ]
                    ]
                ]
            ]
        ]
    ]
]);

echo "Deployment {$deployment['metadata']['name']} created
";

This code uses the KubernetesClient class to create a Kubernetes Client object, and then create a deployment object through the createDeployment method. The deployment object includes some important properties, such as apiVersion, kind, metadata and spec, where metadata Includes the name of the deployment, spec includes the deployment configuration information, such as Pod template, container image, number of copies, selectors, etc.

3. Expand Kubernetes deployment

In Kubernetes, the dynamic expansion and contraction of applications can be achieved by modifying the number of deployed replicas. In PHP programming, you can use the Kubernetes API to update the configuration information of the deployment object, such as the following sample code:

<?php
require 'vendor/autoload.php';

use KubernetesClient;

$client = new Client([
    'master' => 'http://kubernetes-master:8080'
]);

$deployment = $client->deployments()->updateDeployment('my-deploy', [
    'spec' => [
        'replicas' => 4
    ]
]);

echo "Deployment {$deployment['metadata']['name']} updated
";

This code uses the KubernetesClient class to create a Kubernetes client object , and then update the number of copies of the deployment object through the updateDeployment method. Updating the deployment object can be achieved by calling the setter method of the deployment object, such as setReplicas.

4. Rolling update Kubernetes deployment

In Kubernetes, seamless application upgrades can be achieved through rolling update. The rolling update process usually includes the following steps: first create a new deployment object, and then gradually replace the Pod copies in the old deployment object with the Pod copies in the new deployment object.

In PHP programming, you can use the Kubernetes API to implement rolling update operations, such as the following sample code:

<?php
require 'vendor/autoload.php';

use KubernetesClient;

$client = new Client([
    'master' => 'http://kubernetes-master:8080'
]);

$newDeployment = $client->deployments()->createDeployment([
    'apiVersion' => 'apps/v1',
    'kind' => 'Deployment',
    'metadata' => [
        'name' => 'my-deploy-v2'
    ],
    'spec' => [
        'selector' => [
            'matchLabels' => [
                'app' => 'my-app-v2'
            ]
        ],
        'replicas' => 2,
        'template' => [
            'metadata' => [
                'labels' => [
                    'app' => 'my-app-v2'
                ]
            ],
            'spec' => [
                'containers' => [
                    [
                        'name' => 'php-app',
                        'image' => 'my-images/php:v2',
                        'ports' => [
                            [
                                'containerPort' => 80
                            ]
                        ]
                    ]
                ]
            ]
        ]
    ]
]);

$client->deployments()->rollingUpdateDeployment('my-deploy', $newDeployment, [
    'strategy' => [
        'type' => 'RollingUpdate',
        'rollingUpdate' => [
            'maxSurge' => 1,
            'maxUnavailable' => 0
        ]
    ],
    'minReadySeconds' => 30
]);

echo "Deployment my-deploy rolling updated to v2
";

This code first creates a new deployment objectmy- deploy-v2, and then start the rolling update operation through the rollingUpdateDeployment method. The rolling update operation includes some important parameters, such as update strategy (type, maxSurge, maxUnavailable), minimum preparation time (minReadySeconds )wait.

Conclusion

Kubernetes is a powerful container orchestration system that provides many APIs and tools to simplify container management and deployment. In PHP programming, you can operate the Kubernetes cluster through the Kubernetes API, such as creating services, creating deployments, extending deployments, and rolling update deployments. These operations can help PHP developers quickly build highly available, efficient, and scalable containerized applications to meet different business needs.

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