新装系统curl https报错
curl "https://www.baidu.com"
curl: (60) SSL certificate problem: unable to get local issuer certificate
More details here: http://curl.haxx.se/docs/sslcerts.html

curl performs SSL certificate verification by default, using a "bundle"
of Certificate Authority (CA) public keys (CA certs). If the default
bundle file isn't adequate, you can specify an alternate file
using the --cacert option.
If this HTTPS server uses a certificate signed by a CA represented in
the bundle, the certificate verification probably failed due to a
problem with the certificate (it might be expired, or the name might
not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
the -k (or --insecure) option.

问题解决：

wget https://curl.haxx.se/ca/cacert.pem ;下载后放大 /et/
export CURL_CA_BUNDLE=/etc/cacert.pem #可以写到 /etc/profile
curl -v https://www.baidu.com 测试通过

k8s dockerfile

#提前下载好文件到file
ADD file/cacert.pem /etc/cacert.pem
ENV CURL_CA_BUNDLE /etc/cacert.pem