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Julien Dessaux 2021-03-11 23:15:31 +01:00
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content/blog/kubernetes/get_key_and_certificae.md
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---
title: "Get tls certificate and key from a kubernetes secret"
date: 2020-08-06
description: How to extract a tls certificate and keys from a kubernetes secret
tags:
- kubernetes
---
My use case is to deploy a wildcard certificate that was previously handled by an acme.sh on my legacy lxd containers. Since moving to kubernetes parts of my services I have been using cert-manager to issue letsencrypt certificates. Since I am not done yet I looked into a way of getting a certificate out of kubernetes. Assuming we are working with a secret named `wild.adyxax.org-cert` and our namespace is named `legacy` :
## The problem
My use case is to deploy a wildcard certificate that was previously handled by an acme.sh on a legacy lxd containers. Since moving to kubernetes parts of my services I have been using cert-manager to issue letsencrypt certificates for the cluster's ingresses. Since I am not done migrating everything yet I need a way of getting a certificate out of kubernetes.
## The solution
Assuming we are working with a secret named `wild.adyxax.org-cert` and our namespace is named `legacy` :
{{< highlight sh >}}
kubectl -n legacy get secret wild.adyxax.org-cert -o json -o=jsonpath="{.data.tls\.crt}" | base64 -d > fullchain.cer
kubectl -n legacy get secret wild.adyxax.org-cert -o json -o=jsonpath="{.data.tls\.key}" | base64 -d > adyxax.org.key