update centos 出現以下問題：
GPG key retrieval failed: [Errno 14] curl#37 – “Couldn’t open file /etc/pki/rpm-gpg/MariaDB-Server-GPG-KEY”
解決之道：
rpm –import https://downloads.mariadb.com/MariaDB/MariaDB-Server-GPG-KEY
update centos 出現以下問題：
GPG key retrieval failed: [Errno 14] curl#37 – “Couldn’t open file /etc/pki/rpm-gpg/MariaDB-Server-GPG-KEY”
解決之道：
rpm –import https://downloads.mariadb.com/MariaDB/MariaDB-Server-GPG-KEY