1. Update credentials file

First, update your credentials file (for most providers, this is credentials-velero and the contents are described in the plugin installation instructions: AWS, Azure, GCP)

2. Update secret

Now update the velero secret. On linux:

kubectl patch -n velero secret cloud-credentials -p '{"data": {"cloud": "'$(base64 -w 0 credentials-velero)'"}}'

• patch tells kubectl to update a resource by merging the provided data
• -n velero tells kubectl to use the velero namespace
• secret is the resource type
• cloud-credentials is the name of the secret used by Velero to store credentials
• -p specifies that the next word is the patch data. It's more common to patch using JSON rather than YAML
• '{"data": {"cloud": "<your-base64-encoded-secret-will-go-here>"}}' this is the JSON data that matches the existing structure of the Velero secret in Kubernetes. <your-base64-encoded-secret-will-go-here> is a placeholder for the command we'll insert.
• $(base64 -w 0 credentials-velero) reads the file credentials-velero in the current directory, turns off word wrapping of the output (-w 0), BASE64-encodes the contents of the file, and inserts the result in the data.