第一步: 将ca 证书 从cert 格式转换成pem格式
openssl x509 -in ca.crt -out ca.pem -outform PE
第二步: 将ca 证书导入至系统中来
cat ca.pem >> /etc/pki/tls/certs/ca-bundle.crt
openssl x509 -in ca.crt -out ca.pem -outform PE
cat ca.pem >> /etc/pki/tls/certs/ca-bundle.crt