当在Amazon Linux 2上执行 yum update 时候，提示如下信息：
[root@ip-172-31-6-95 ~]# yum update
Loaded plugins: extras_suggestions, langpacks, priorities, update-motd
234 packages excluded due to repository priority protections
No packages marked for update
[root@ip-172-31-6-95 ~]#这是由于yum组件的priority插件已经不在被使用。
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