Note: All commands are written for juju >= v.3.0
If you are using an earlier version, check the Juju 3.0 Release Notes.
How to enable TLS encryption
Disclaimer: In this guide, we use self-signed certificates provided by the self-signed-certificates operator.
This is not recommended for a production environment.
For production environments, check the collection of Charmhub operators that implement the tls-certificate interface, and choose the most suitable for your use-case.
Enable TLS
Deploy the TLS charm:
juju deploy self-signed-certificates --config ca-common-name="Tutorial CA"
To enable TLS, integrate (formerly known as “relate”) the two applications:
juju integrate postgresql-k8s self-signed-certificates
Manage keys
Updates to private keys for certificate signing requests (CSR) can be made via the set-tls-private-key action. Note that passing keys to external/internal keys should only be done with base64 -w0, not cat.
With three replicas, this schema should be followed:
Generate a shared internal key:
openssl genrsa -out internal-key.pem 3072
Generate external keys for each unit:
openssl genrsa -out external-key-0.pem 3072
openssl genrsa -out external-key-1.pem 3072
openssl genrsa -out external-key-2.pem 3072
Apply both private keys to each unit. The shared internal key will be applied only to the juju leader.
juju run postgresql-k8s/0 set-tls-private-key "external-key=$(base64 -w0 external-key-0.pem)" "internal-key=$(base64 -w0 internal-key.pem)"
juju run postgresql-k8s/1 set-tls-private-key "external-key=$(base64 -w0 external-key-1.pem)" "internal-key=$(base64 -w0 internal-key.pem)"
juju run postgresql-k8s/2 set-tls-private-key "external-key=$(base64 -w0 external-key-2.pem)" "internal-key=$(base64 -w0 internal-key.pem)"
Updates can also be done with auto-generated keys with
juju run postgresql-k8s/0 set-tls-private-key
juju run postgresql-k8s/1 set-tls-private-key
juju run postgresql-k8s/2 set-tls-private-key
Disable TLS
You can disable TLS by removing the integration.
juju remove-relation self-signed-certificates postgresql-k8s