#Creating a simple application via image

This technical guide demonstrates how to efficiently create, manage, and access containerized applications in using Kubernetes-native methodologies.

#Introduction

#Use Cases

• New users seeking to understand fundamental application creation workflows on Kubernetes platforms
• Practical exercise demonstrating core platform capabilities including:
  • Project/Namespace orchestration
  • Deployment creation
  • Service exposure patterns
  • Application accessibility verification

#Time Commitment

Estimated completion time: 10-15 minutes

#Important Notes

• This technical guide focuses on essential parameters - refer to comprehensive documentation for advanced configurations
• Required permissions:
  • Project/Namespace creation
  • Image repository integration
  • Workload deployment

#Prerequisites

• Basic understanding of Kubernetes architecture and platform concepts
• Pre-configured project following platform establishment procedures

#Workflow Overview

No.	Operation	Description
1	Create Namespace	Establish resource isolation boundary
2	Configure Image Repository	Set up container image sources
3	Create application via Deployment	Create Deployment workload
4	Expose Service via NodePort	Configure NodePort service
5	Validate Application Accessibility	Test endpoint connectivity

#Procedure

#Create namespace

Namespaces provide logical isolation for resource grouping and quota management.

Prerequisites

• Permissions to create, update, and delete namespaces(e.g., Administrator or Project Administrator roles)
• kubectl configured with cluster access

Creation Process

1. Log in, and navigate to Project Management > Namespaces

2. Select Create Namespace

3. Configure essential parameters:

   ** Parameter **	Description
   Cluster	Target cluster from project-associated clusters
   Namespace	Unique identifier (auto-prefixed with project name)

4. Complete creation with default resource constraints

#Configure Image Repository

supports multiple image sourcing strategies:

#Method 1: Integrated Registry via Toolchain

1. Access Platform Management > Toolchain > Integration

2. Initiate new integration:

   Parameter	Requirement
   Name	Unique integration identifier
   API Endpoint	Registry service URL (HTTP/HTTPS)
   Secret	Pre-existing or newly created credential

3. Allocate registry to target platform project

#Method 2: External Registry Services

• Use publicly accessible registry URLs (e.g., Docker Hub)
• Example: index.docker.io/library/nginx:latest

Verification Requirement

• Cluster network must have egress access to registry endpoints

#Create application via Deployment

Deployments provide declarative updates for Pod replicasets.

Creation Process

1. From Container Platform view:
   • Use namespace selector to choose target isolation boundary
2. Navigate to Workloads > Deployments
3. Click Create Deployment
4. Specify image source:
   • Select integrated registry or
   • Input external image URL (e.g., index.docker.io/library/nginx:latest)
5. Configure workload identity and launch

Management Operations

• Monitor replica status
• View events and logs
• Inspect YAML manifests
• Analyze resource metrics, alerts

#Expose Service via NodePort

Services enable network accessibility to Pod groups.

Creation Process

1. Navigate to Networking > Services

2. Click Create Service with parameters:

   Parameter	Value
   Type	NodePort
   Selector	Target Deployment name
   Port Mapping	Service Port: Container Port (e.g., 8080:80)

3. Confirm creation.

Critical

• Cluster-visible virtual IP
• NodePort allocation range (30000-32767)

Internal routes enable service discovery for workloads by providing a unified IP address or host port for access.

1. Click on Network > Service.

2. Click on Create Service.

3. Configure the Details based on the parameters below, keeping other parameters at their defaults.

   Parameter	Description
   Name	Enter the name of the Service.
   Type	NodePort
   Workload Name	Select the Deployment created previously.
   Port	Service Port: The port number exposed by the Service within the cluster, i.e., Port, e.g., 8080. Container Port: The target port number (or name) mapped by the service port, i.e., targetPort, e.g., 80.

4. Click on Create. At this point, the Service is successfully created.

#Validate Application Accessibility

Verification Method

1. Obtain exposed endpoint components:
   • Node IP: Worker node public address
   • NodePort: Allocated external port
2. Construct access URL: http://<Node_IP>:<NodePort>
3. Expected result: Nginx welcome page