examples/shared should have a reference to LBaaS certificates creation

[paalonso]

The provided example creates a LB with a certificate that has a reference to pre-existing local certificates folder:

                        "certificates": {
                            "LB-SHARED-CERT-1-KEY": {
                                "ca_certificate": "~/certs/ca.crt",
                                "certificate_name": "lb1-cert1",
                                "private_key": "~/certs/my_cert.key",
                                "public_certificate": "~/certs/my_cert.crt"
                            }
                        },

We should indicate the need to have valid PEM certificates for the Load Balancer. For educational purposes, and if the user has not trusted CA certificates we can point to a public reference with instructions on how to setup self-signed certificates in the shared MD documentation or a link to a secondary MD with some instructions like:

    a. Create a Self-Signed Root CA:
    openssl req -x509 -sha256 -days 1825 -newkey rsa:2048 -keyout ca.key -out ca.crt

    b. Create a cert key and certificate signing request (CSR):
    openssl req -nekey rsa:2048 -nodes -keyout my_cert.key -out my_cert.csr

    c. Sign the certificate CSR with Root CA:
    cat my_cert.txt
    authorityKeyIdentifier=keyid,issuer 
    basicConstraints=CA:FALSE 
    subjectAltName = @alt_names [alt_names] 
    DNS.1 = oe01.com

    openssl x509 -req -CA ca.crt -CAkey ca.key -in my_cert.csr -out my_cert.crt -days 365 -CAcreateserial -extfile my_cert.txt

    d. Check the cert:
    openssl x509 -text -noout -in my_cert.crt

[paolajuarezgomez]

I agree, I think this is a prerequisite for the template provided, and should be detailed.

[paalonso]

Instructions created in the common_lbaas_self-signed_certificates_howto.md and references in the shared & OE examples.