使用yum update 更新的時候出現 “Couldn’t open file /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7” 這樣的提示，去CentOS的官網：https://www.centos.org/keys/RPM-GPG-KEY-CentOS-7，找到 CentOS 7 Signing Key 下載到/etc/pki/rpm-gpg/下面，並改名叫RPM-GPG-KEY-CentOS-7，再次更新即可。
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原文鏈接：https://blog.csdn.net/rznice/article/details/84280832
Couldn't open file /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 解決辦法（轉）
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