ArgoCD: Authenticate to private Github repository via ssh

In this article I'll share a step by step of how to add ssh authentication to a private Github repository:

Create the key pair (select empty passphrases on prompt)

ssh-keygen -t ed25519 -C "mateo.cuervo@example.com" -f ~/.ssh/argocd_ed25519

Copy the public key

cat ~/.ssh/argocd_ed25519.pub

Go to your Github repo, you should be admin, then click on "Settings" then on "Deploy keys" and finally save the key copied in last step.

Now copy the private key part

cat ~/.ssh/argocd_ed25519

Create a kubernetes secret with the key final result should look something like this:

apiVersion: v1
kind: Secret
metadata:
  name: repo-secret
  namespace: argocd
  labels:
	  # This annotation let's ArgoCD know it's for repository authentication
    argocd.argoproj.io/secret-type: repository
stringData:
  url: git@github.com:cooervo/my-repo-name.git
  sshPrivateKey: |
    -----BEGIN OPENSSH PRIVATE KEY-----
    ...
    -----END OPENSSH PRIVATE KEY-----
  insecure: "false"

Deploy the secret in your cluster. Next open your ArgoCD server UI navigate to "Settings" > "Repository", your repo should be connected: