DOC: add information on how to create the keystore from cert files

README_SETUP.md

@@ -67,11 +67,16 @@ server:
 2. Create an SSL certificate somewhere with a `Java Key Store` file.  For
    self-signed certificates (not recommended for production use) you can do:
    - `mkdir certificates; cd certificates`
-   - `keytool -genkey -keyalg RSA -alias selfsigned -keystore keystore.jks -validity 375 -keysize 2048 -ext san=dns:localhost`
+   - `keytool -genkey -keyalg RSA -alias selfsigned -keystore caosdb.jks -validity 375 -keysize 2048 -ext san=dns:localhost`
      Replace `localhost` by your host name, if you want.
-   - `keytool -importkeystore -srckeystore keystore.jks -destkeystore keystore.p12 -deststoretype PKCS12 -srcalias selfsigned`
-   - `openssl pkcs12 -in keystore.p12 -nokeys -out cert.pem`
+   - `keytool -importkeystore -srckeystore caosdb.jks -destkeystore caosdb.p12 -deststoretype PKCS12 -srcalias selfsigned`
+   - `openssl pkcs12 -in caosdb.p12 -nokeys -out cert.pem`
    - You can check the content of the certificate with `openssl x509 -in cert.pem -text`
+
+   Alternatively, you can create a keystore from certificate files that you already have:
+   - `openssl pkcs12 -export -inkey privkey.pem -in fullchain.pem -out all-certs.pkcs12`
+   - `keytool -importkeystore -srckeystore all-certs.pkcs12 -srcstoretype PKCS12  -deststoretype pkcs12 -destkeystore caosdb.jks`
+
 3. Copy `conf/core/server.conf` to `conf/ext/server.conf` and change it
    appropriately:
     * Setup for MySQL back-end: Assuming that the mysql back-end is installed