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check kube client cert validity period
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| cat ~/.kube/config | grep client-certificate | sed -e ‘s/ client-certificate-data: //’ | base64 -d | openssl x509 -in - -noout -text |
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Or even better,
end=cat ~/.kube/config | grep client-certificate | sed -e 's/ client-certificate-data: //' | base64 -d | openssl x509 -in - -noout -enddate |cut -d "=" -f 2; echo $end; end_s=date -d "${end}" "+%s"; echo -e "\033[1m$(((${end_s}-date +%s)/(24*3600)))\033[0m days until expiration"