SIMPLE WAYS TO CONFIGURE K8S APP

Pre-requisites:

• Previous knowledge of Kubernetes and Kubernetes Cluster
• Already have basic knowledge on how to create a yaml file using imperative commands; such as "kubectl".

Objectives/Outcome:

• The reader should be able to differentiate each concept from the other (Namespaces, ConfigMaps, Secrets)
• The reader should be able to differentiate each concept from the other (Pods, Deployments, Service)
• You should be able to create your own basic configurations using the given examples.
• Be familiar with some of the ways to secure your Kubernetes cluster

General Kubernetes Resources for Application Configuration:

1. Namespaces:

Namespaces segment a Kubernetes cluster, helps with organization and easy access control.

2. ConfigMaps:

ConfigMaps store configuration data as key-value pairs for applications.

3. Secrets:

Secrets securely store sensitive information like passwords and API keys.

Deploying Applications:

1. Pods:

Pods are the smallest deployable units, running a single process inside a container.

2. Deployments:

Deployments manage application scaling and updates, ensuring availability.

3. Services:

Services provide network access and load balancing to groups of Pods.

Simple example of each Kubernetes resources:

General Kubernetes Resources for Application Configuration:

1. Namespaces:

- Example: Create a namespace named "development" to isolate resources for a development team.

2. ConfigMaps:

- Example: Create a ConfigMap to store database connection information.

3. Secrets:

- Example: Create a Secret to store an API key.

Deploying Applications:

1. Pods:

- Example: Create a Pod running an Nginx web server.

2. Deployments:

- Example: Create a Deployment for a web application with 3 replicas.

3. Services:

- Example: Create a Service to load balance traffic to a set of Pods.

Security Recommendations:

1. Secure Configurations:Do not use default or weak passwords for Kubernetes components and ensuring that etcd (Kubernetes datastore) is adequately secured.
2. Image Pull Policies:

• It's important to configure image pull policies to restrict where container images can be pulled from to prevent unauthorized sources.

1. Network Security:

• Use Network Policies to restrict communication between Pods, allowing only necessary traffic and following the principle of least privilege.

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