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cxhercules/k8s-cert-sha.txt

Created December 29, 2018 06:17
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k8s-cert-sha.txt
openssl x509 -in /etc/kubernetes/pki/ca.crt -noout -pubkey | openssl rsa -pubin -outform DER 2>/dev/null | sha256sum | cut -d' ' -f1
Reference:
https://github.com/kubernetes/kubeadm/issues/659#issuecomment-392822587
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Above will get the sha256sum for public cert used in kubeadm join command if you ever forget it and have an active token you want to use.

Goes with following argument:
--discovery-token-ca-cert-hash

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