How To Copy Kubernetes Secret Between Namespaces

A simple way of copying common secret data (e.g.: docker registry credentials) between namespaces is provided by the --export flag of kubectl get . Pipe its output to kubectl apply -n <target namespace> -f - , and you are done!

1. Are Kubernetes secrets namespace specific?
2. How do I move pods from one namespace to another?
3. How do I share Configmap between namespaces?
4. How do you get secret from Kubernetes?
5. How do you decode k8s secret?
6. How do I rename Kubernetes secret?
7. What is POD in Kubernetes?
8. When using deployments it is recommended to manage ReplicaSets by yourself?
9. How do I access a service from a different namespace?
10. How do I deploy a ConfigMap?
11. How frequently does the Kubelet refresh the values of ConfigMaps mounted as volumes inside pods?
12. How do I copy a secret from one cluster to another?

Are Kubernetes secrets namespace specific?

Secret API objects reside in a namespace. They can only be referenced by pods in that same namespace. Basically, you will have to create the secret for every namespace.

How do I move pods from one namespace to another?

You cannot "move" a resource to another namespace. There might be resource with same name in the other namespace already. So yes, you need to delete the existing pod and recreate it in the other namespace.

How do I share Configmap between namespaces?

They cannot be shared, because they cannot be accessed from a pods outside of its namespace. Names of resources need to be unique within a namespace, but not across namespaces. Workaround it is to copy it over.

How do you get secret from Kubernetes?

Kubernetes Secrets are, by default, stored as unencrypted base64-encoded strings.
...
There are several options to create a Secret:

1. create Secret using kubectl command.
2. create Secret from config file.
3. create Secret using kustomize.

How do you decode k8s secret?

You can use kubectl get secrets/db-user-pass -o yaml or -o json where you'll see the base64-encoded username and password . You can then copy the value and decode it with something like echo <ENCODED_VALUE> | base64 -D .

How do I rename Kubernetes secret?

Steps to Reproduce:

1. Create a secret named example from Rancher ui.
2. Deploy workload-1 which inject values from this secret.
3. Rename secret example to example-renamed from Rancher ui.
4. Deploy workload-2 which inject values from this secret (now listed as example-renamed.

What is POD in Kubernetes?

Pods are the smallest, most basic deployable objects in Kubernetes. A Pod represents a single instance of a running process in your cluster. Pods contain one or more containers, such as Docker containers. When a Pod runs multiple containers, the containers are managed as a single entity and share the Pod's resources.

When using deployments it is recommended to manage ReplicaSets by yourself?

When to use a ReplicaSet

Therefore, we recommend using Deployments instead of directly using ReplicaSets, unless you require custom update orchestration or don't require updates at all.

How do I access a service from a different namespace?

To access a service that is deployed in a different namespace than the one you're accessing it from, use a FQDN in the form $SVC. $NAMESPACE. svc. cluster.

How do I deploy a ConfigMap?

Once you define environment variables ConfigMap , you can utilize them in the command section in Pod spec i.e. spec. containers. command using the $(VARIABLE_NAME) format. You need to ensure that the ConfigMap being referenced in a Pod is already created — otherwise, the Pod will not start.

How frequently does the Kubelet refresh the values of ConfigMaps mounted as volumes inside pods?

Mounted ConfigMaps are updated automatically

As a result, the total delay from the moment when the ConfigMap is updated to the moment when new keys are projected to the pod can be as long as kubelet sync period (1 minute by default) + ttl of ConfigMaps cache (1 minute by default) in kubelet.

How do I copy a secret from one cluster to another?

Export the secret

We want to copy a secret from our "source" cluster to our "destination" cluster. So first, ensure you're authenticated with your source cluster. This should show the name of the context configured to access your source cluster. Now export the secret, and store the secret config data in a file.