将文中jireh.xyz替换成自己的地址
echo -n | openssl s_client -showcerts -connect jireh.xyz:443 2>/dev/null | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > /usr/local/share/ca-certificates/jireh.xyz.crt
update-ca-certificates
$ echo -n | openssl s_client -showcerts -connect jireh.xyz:443 2>/dev/null | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' >> /etc/ssl/certs/ca-certificates.crt