What's the maximum number of Kubernetes namespaces?

This is quite difficult to answer which has dependency on a lot of factors, Here are some facts which were created on the k8s 1.7 cluster kubernetes-theresholds the Number of namespaces (ns) are 10000 with few assumtions

There is no limit on number of namespaces. You can create as many as you want. It doesn't actually consume cluster resources like cpu, memory etc.

The are no limits from the code point of view because is just a Go type that gets instantiated as a variable.

In addition to link that @SureshVishnoi posted, the limits will depend on your setup but some of the factors that can contribute to how your namespaces (and resources in a cluster) scale can be:

• Physical or VM hardware size where your masters are running
  • Unfortunately, EKS doesn't provide that yet (it's a managed service after all)
• The number of nodes your cluster is handling.
• The number of pods in each namespace
• The number of overall K8s resources (deployments, secrets, service accounts, etc)
• The hardware size of your etcd database.
  • Storage: how many resources can you persist.
  • Raw performance: how much memory and CPU you have.
• The network connectivity between your master components and etcd store if they are on different nodes.
  • If they are on the same nodes then you are bound by the server's memory, CPU and storage.