[OpenSSL] TLS 인증서 체크

openssl s_client -showcerts -connect {VIP}:443 -servername '{DOMAIN}' /dev/null -legacy_renegotiation | tee >(openssl x509 -noout -serial -dates) | grep -E "CN|serial|GMT"

• Subject, Issuer, Authority Information Access 정보
• 일련 번호(serial), 유효 기간(dates) 정보