add SANS in server's certificate #2
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Bug description
Below errors were occurred after following the tutorial.
On client side,
time="2022-02-13T16:17:40Z" level=error msg="Get \"https://172.17.0.4:22211/discover\": x509: certificate relies on legacy Common Name field, use SANs instead"On server side,
2022/02/13 16:17:40 http: TLS handshake error from 172.17.0.5:45394: remote error: tls: bad certificateRoot cause
After golang 1.15, we should use SANS or temporarily enable Common Name matching with GODEBUG=x509ignoreCN=0.
See https://stackoverflow.com/questions/64814173/ how-do-i-use-sans-with-openssl-instead-of-common-name.
Solution description
I added a guideline that describes how to add SANS in server's certificate.
If there is any problem, please tell me. I'm willing to fix it.