受最近 Let’sEncrypt 曾经的根证书DST Root X3过期影响，导致系统后端连接使用 Let’sEncrypt 证书的网址提示以下证书过期错误：
curl: (60) SSL certificate problem: certificate has expired
More details here: https://curl.haxx.se/docs/sslcerts.html
curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.
解决方法：
yum install ca-certificates
update-ca-trust force-enable
update-ca-trust extract
安装并强制更新证书后即可。
