Curl 旋度：（60）同龄人'；s证书的签名无效

当我在服务器（CentOS 7.4）中使用此命令访问kubernetes（v1.15）api服务器时：

输出如下所示：

[root@ops001 cert]# curl -v --cacert /etc/kubernetes/cert/kubernetes.pem https://172.19.104.231:6443
* About to connect() to 172.19.104.231 port 6443 (#0)
*   Trying 172.19.104.231...
* Connected to 172.19.104.231 (172.19.104.231) port 6443 (#0)
* Initializing NSS with certpath: sql:/etc/pki/nssdb
*   CAfile: /etc/kubernetes/cert/kubernetes.pem
  CApath: none
* Server certificate:
*   subject: CN=kubernetes,OU=4Paradigm,O=k8s,L=BeiJing,ST=BeiJing,C=CN
*   start date: Sep 17 16:37:00 2019 GMT
*   expire date: Sep 14 16:37:00 2029 GMT
*   common name: kubernetes
*   issuer: CN=kubernetes,OU=4Paradigm,O=k8s,L=BeiJing,ST=BeiJing,C=CN
* NSS error -8182 (SEC_ERROR_BAD_SIGNATURE)
* Peer's certificate has an invalid signature.
* Closing connection 0
curl: (60) Peer's certificate has an invalid signature.
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.

如何使用curl使自签名证书在本地机器上工作

[root@ops001 cert]# curl -v --cacert /etc/kubernetes/cert/kubernetes.pem https://172.19.104.231:6443
* About to connect() to 172.19.104.231 port 6443 (#0)
*   Trying 172.19.104.231...
* Connected to 172.19.104.231 (172.19.104.231) port 6443 (#0)
* Initializing NSS with certpath: sql:/etc/pki/nssdb
*   CAfile: /etc/kubernetes/cert/kubernetes.pem
  CApath: none
* Server certificate:
*   subject: CN=kubernetes,OU=4Paradigm,O=k8s,L=BeiJing,ST=BeiJing,C=CN
*   start date: Sep 17 16:37:00 2019 GMT
*   expire date: Sep 14 16:37:00 2029 GMT
*   common name: kubernetes
*   issuer: CN=kubernetes,OU=4Paradigm,O=k8s,L=BeiJing,ST=BeiJing,C=CN
* NSS error -8182 (SEC_ERROR_BAD_SIGNATURE)
* Peer's certificate has an invalid signature.
* Closing connection 0
curl: (60) Peer's certificate has an invalid signature.
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.