今天在使用​​wget​​来下载下载一个不安全的https 域名下的内容时会提示如下内容：

cannot verify pkg.jenkins.io's certificate, issued by ‘/C=US/O=Let's Encrypt/CN=R3’
 Issued certificate has expired. To connect to pkg.jenkins.io insecurely, use `--no-check-certificate'.

我们的解决方法是安装一个​​ca-certificates​​包

sudo yum install -y ca-certificates