Copying kubernetes resources accross namespaces

copy-k8s-resources-across-namespaces.sh

kubectl get rs,secrets -o json --namespace old | jq '.items[].metadata.namespace = "new"' | kubectl create-f  -

There's a typo: should be kubectl create -f instead of kubectl create-f near the end.

@slomek That's right! @simonswine thank you for providing this!

Version without jq:

kubectl get secrets -n old -o yaml | sed 's/namespace: old/namespace: new/'  | kubectl create -f -

Reads corrected

kubectl get rs,secrets -o json --namespace old | jq '.items[].metadata.namespace = "new"' | kubectl create -f  -

It might be neccessary to delete some metadata in order to apply/create it. I'm not sure which values I had to delete to make it work, but the UUID is probably a good start.

Also consider using the --export option on get command:

--export=false: If true, use 'export' for the resources.  Exported resources are stripped of cluster-specific information.

Export is now deprecated 😢

The command kubectl get secret www-snowdrop-dev-tls -n snowdrop-site -o yaml | sed 's/namespace: snowdrop-site/namespace: generator-site/' | kubectl create -n generator-site -f - is failing

for: "STDIN": Operation cannot be fulfilled on secrets "www-snowdrop-dev-tls": the object has been modified; please apply your changes to the latest version and try again

So what is the alternative to --export ?

I wanted too make a copy all my resources running in sandbox namespace to staging namespace , Hence tired running this following cmd

kubectl get rs,secrets -o json --namespace sandbox | jq '.items[].metadata.namespace = "staging"' | kubectl create -f -

A copy of my resources gets created inside staging namespace, all the pods fails with an error:

authorization-55b866f8c4-7nkxp 0/1 CreateContainerConfigError 0 77s
consults-6b796cf5f4-wrjbf 0/1 CreateContainerConfigError 0 77s
core-api-8dd575db9-9bgth 0/1 CreateContainerConfigError 0 77s

what I am doing wrong? I just wanted to make a copy of this resources into staging namespace and play around