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ubuntu@controller-0:~$ openssl x509 -in /var/lib/kubernetes/kubernetes.pem -text
Certificate:
Data:
Version: 3 (0x2)
[... a lot of stuff that isn't relevant ...]
X509v3 Subject Alternative Name:
DNS:kubernetes, DNS:kubernetes.default, DNS:kubernetes.default.svc, DNS:kubernetes.default.svc.cluster, DNS:kubernetes.svc.cluster.local, DNS:kubernetes.something.local, IP Address:10.10.0.10, IP Address:10.10.0.11, IP Address:10.10.0.12, IP Address:10.50.0.1, IP Address:127.0.0.1, IP Address:10.0.0.1
[... a lot more stuff that isn't relevant ...]
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