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CentOS Linux release 7.5.1804
yum 尝试换了源【163,aliyun】
yum -y update 等操作 一直都502
束手无策 ，现在有点怀疑 DNS 或者 网关问题 因为服务器没在阿里云或网易云买的
目前是aliyun.com的源
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就是服务器限制问题。。。告诉客户服务器网管改了下，就可以了。。。。