Kubernetes: From Zero to Hero (Part 11) - Namespaces
Published: 2022-12-31 11:23:13

Kubernetes namespaces are a way to partition resources in a cluster and control access to those resources. They allow you to create multiple virtual clusters within a single physical cluster, which can be useful for a number of different purposes.

## Why are they useful?

One common use case for namespaces is to isolate resources and control access. For example, you might create a namespace for each team in your organization, and then grant each team access only to the resources within their own namespace. This can help to enforce separation of duties and prevent accidental or unauthorized access to resources.

Another use case for namespaces is to manage multiple environments, such as development, staging, and production. By using namespaces, you can easily deploy and manage different versions of your applications in different environments, while still sharing common resources such as storage and networking.

## How to create a namespace

To create a namespace in Kubernetes, you can use the kubectl create namespace command. For example:

```bash
kubectl create namespace my-namespace
```

This will create a namespace called "my-namespace."

## How to use namespaces to isolate resources and control access

To use a namespace to isolate resources and control access, you can specify the namespace when creating resources in Kubernetes. For example, to create a deployment in the "my-namespace" namespace, you can use the following command:

```bash
kubectl create deployment my-deployment --namespace=my-namespace
```

You can also use namespace labels and selectors to control access to resources. For example, you can label a namespace with the team that should have access to it, and then use a namespace selector to grant access to that team.

## Best practices for using namespaces

- Use namespaces to reflect your organization's structure or separation of duties.
- Consider using namespaces to isolate resources for different environments (e.g. development, staging, production).
- Use namespaces to manage access to shared resources, such as storage and networking.
- Tips for naming your namespaces
- Use descriptive and meaningful names for your namespaces.
- Avoid using names that are too general or could be confused with other resources.
- Use a consistent naming convention for your namespaces to make them easier to manage.

## Using namespaces to manage multiple environments (e.g. dev, staging, production)

You can use namespaces to deploy and manage different versions of your applications in different environments. For example, you might create a "development" namespace for development versions of your applications, and a "production" namespace for the versions that are live in production.

## Using namespaces to provide multi-tenancy

You can use namespaces to provide multi-tenancy, which is the ability to host multiple isolated groups of users (tenants) on a shared cluster. This can be useful in a number of scenarios, such as hosting applications for multiple customers on a shared cluster.

## Conclusion

In summary, Kubernetes namespaces are a useful tool for partitioning resources and controlling access in your cluster, and can be used for a variety of different purposes. Some best practices for using namespaces include organizing them based on your organization's structure or separation of duties, and using descriptive and meaningful names. In addition to providing multitenancy, namespaces can also be used to manage multiple environments.

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