You can also set a resource quota per namespace, so that a resource-hungry application doesn't exhaust the cluster capacity, impacting other teams’ resources. By providing isolation and team-based access security, separate namespaces help ensure teams work on their own without disrupting others. When different teams deploy projects to the same namespace, they risk affecting each other's work. In addition to technologies such as service mesh and multi-cloud continuous delivery, multiple namespaces are essential to managing large-scale scenarios. Coordinating so many resources is an administrative challenge, and for developers it becomes impossible to run the entire stack on the local machine. Third-party companies might also contribute to the platform, further increasing complexity. In larger companies, too, teams may be widely dispersed, often working on projects that other teams aren't aware of, making it hard to keep up with frequent changes. In this case, the company could create sub-teams, with a separate namespace for each. But for a rapidly growing company, with far more services, a single namespace could make it hard to coordinate the team's work. A small team working with a few microservices can easily deploy all services into the default namespace. Configuring multiple namespaces creates a sophisticated façade, freeing your teams from working with a single namespace and improving manageability, security, and performance.ĭifferent companies will adopt different namespace strategies, depending on factors such as team size, structure, and the complexity of their projects. Luckily, you can think of a namespace as a virtual cluster, and Kubernetes supports multiple virtual clusters. Eventually, though, your project is likely to grow to a point where a single namespace will become a limitation. How namespaces workīy default, Kubernetes provides just one workable namespace on top of a physical cluster in which you create all Kubernetes objects. Execute kubectl command for creating namespacesĬreate JSON files representing Namespacesĭevelopment Namespace: Save the filename as this post, we’ll examine three key tools you can use to help keep your Kubernetes cluster organized: namespaces, labels, and annotations.Create JSON files representing namespaces.The following would be required to be done: Let’s create namespaces for development/QA/prod environments. In this article, we will look into creation/deletion of the namespaces for dev/QA/prod. In production (prod) namespace, there will be greater control on who could manage the resources.

There will be lesser restrictions on modifying the resources in dev/QA namespaces. The objects in dev/QA namespace such as pods, services, and deployments will be available for developers/testers respectively to build and run the applications. In real-world scenarios, one can create namespace for development (dev), testing (QA) and production (prod) environment. The namespaces list can be accessed in Kubernetes dashboard as shown in the diagram below:

The following command displays namespace with labels kubectl get namespaces -show-labels The following command can be used to get a list of all namespaces: kubectl get namespaces

Kube-system: Namespace for objects/resources created by Kubernetes system.

Kube-public: Namespace for resources which are publicly available/readable by all.

The default namespace is used to hold the default set of Pods, Services, and Deployments used by the cluster.

Default: Catch-all namespace for all objects not belonging to kube public or kube system namespace.

Names of resource within one namespace need to be unique.īy default, Kubernetes starts with the following three namespaces: One physical cluster can be represented as a set of multiple such virtual clusters (namespaces). This logical entity can also be termed as a virtual cluster. Kubernetes namespace can be seen as a logical entity used to represent cluster resources for usage of a particular set of users.

Execute Kubectl Command for Creating Namespaces.Create JSON files representing Namespaces.

What is kubernetes namespace