How can I modify the values in a Kubernetes secret
using the kubectl
?
I created the secret with kubernetes create secret generic
, but there does not seem to be a way to modify a secret. For example, to add a new secret-value to it, or to change a secret-value in it.
I assume i can go 'low-level', and write the yaml-file and do a kubectl edit
but I hope there is a simpler way.
(I'm using kubernetes 1.2.x
)
The most direct (and interactive) way should be to execute kubectl edit secret <my secret>
. Run kubectl get secrets
if you'd like to see the list of secrets managed by Kubernetes.
As I found myself in the need of modifying a secret, I landed up here.
Here is the most convenient way I found for editing a (one-line) secret.
This elaborates on kubectl edit secret <my secret>
of Timo Reimann above.
kubectl edit secret <my secret>
will (in my case) invoke vi.
Now I move the cursor to the space after the colon of the secret I want to edit.
Then I press r
and [enter]
which will put the base64 encoded value onto a line of its own.
Now I enter :. ! base64 -D
which will decode the current line.
After making my changes to the value, I enter :. ! base64
which will encode the changed value.
Pressing k
[shift]J
will rejoin the secret name and its new value.
:wq
will write the new secretfile and quit vi.
P.S. If the secret has a multi-line value, switch on line numbers (:set nu
) and, after changing the decoded value, use A,B ! base64
where A and B are the line numbers of the first and last line of the value.
P.P.S I just learned the hard way that base64
will receive the text to encode with an appended newline :( If this is no issue for your values - fine. Otherwise my current solution is to filter this out with: .!perl -pe chomp | base64
In case you prefer a non-interactive update, this is one way of doing it:
kubectl get secret mysecret -o json | jq '.data["foo"]="YmFy"' | kubectl apply -f -
Note that YmFy
is a base64-encoded bar
string. If you want to pass the value as an argument, jq
allows you to do that:
kubectl get secret mysecret -o json | jq --arg foo "$(echo bar | base64)" '.data["foo"]=$foo' | kubectl apply -f -
I'm more comfortable using jq
but yq
should also do the job if you prefer yaml format.
来源:https://stackoverflow.com/questions/37180209/kubernetes-modify-a-secret-using-the-kubectl