You can combine the different methods for creating source clone secrets for your specific needs, such as a secret that combines a basic authentication and CA certificate.
Prerequisites
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Basic authentication credentials
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CA certificate
Procedure
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Create a basic authentication secret with a CA certificate
$ oc create secret generic <secret_name> \ --from-literal=username=<user_name> \ --from-literal=password=<password> \ --from-file=ca-cert=</path/to/file> \ --type=kubernetes.io/basic-auth