Tip of How To Find When Kubernetes CA Expires

Find the locations of CA files
They could be in /etc/kubernetes/pki  or  /var/lib/kubelet
Use openssl

# openssl x509 -in  ca.crt  -noout -text
Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number: 0 (0x0)
    Signature Algorithm: sha256WithRSAEncryption
        Issuer: CN=kubernetes
        Validity
            Not Before: Oct 30 08:01:56 2018 GMT
            Not After : Oct 27 08:01:56 2028 GMT
        Subject: CN=kubernetes
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                Public-Key: (2048 bit)
                Modulus:
                    00:cd:ab:2d:f3:86:f3:57:28:43:4f:08:93:a6:e7:
                    22:b0:51:73:74:cb:5a:3c:ee:01:2d:ad:1c:a4:97:
                 .........