How to enable encryption

Note: The TLS settings here are for self-signed-certificates which are not recommended for production clusters, the tls-certificates-operator charm offers a variety of configurations, read more on the TLS charm here

Enable TLS

# deploy the TLS charm
juju deploy tls-certificates-operator

# add the necessary configurations for TLS
juju config tls-certificates-operator generate-self-signed-certificates="true" ca-common-name="Test CA"

# to enable TLS relate the two applications
juju relate tls-certificates-operator postgresql-k8s

Manage keys

Updates to private keys for certificate signing requests (CSR) can be made via the set-tls-private-key action. Note 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 on each unit, shared internal key will be allied only on juju leader

juju run-action postgresql-k8s/0 set-tls-private-key "external-key=$(base64 -w0 external-key-0.pem)"  "internal-key=$(base64 -w0 internal-key.pem)"  --wait
juju run-action postgresql-k8s/1 set-tls-private-key "external-key=$(base64 -w0 external-key-1.pem)"  "internal-key=$(base64 -w0 internal-key.pem)"  --wait
juju run-action postgresql-k8s/2 set-tls-private-key "external-key=$(base64 -w0 external-key-2.pem)"  "internal-key=$(base64 -w0 internal-key.pem)"  --wait

• updates can also be done with auto-generated keys with

juju run-action postgresql-k8s/0 set-tls-private-key --wait
juju run-action postgresql-k8s/1 set-tls-private-key --wait
juju run-action postgresql-k8s/2 set-tls-private-key --wait

Disable TLS remove the relation

juju remove-relation tls-certificates-operator postgresql-k8s