我的centos服务器在更新源的时候更新不了:
yum update
http://mirrors.tencentyun.com/epel/7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirrors.tencentyun.com/epel/7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds')
Trying other mirror
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