CentOS7执行yum命令出错

在CentOS7执行安装命令时，比如yum update等，会出现下面的报错。

Loaded plugins: fastestmirror
Error: invalid clean argument: 'yum'Mini usage:clean [headers|packages|metadata|dbcache|plugins|expire-cache|all]Remove cached data
[root@localhost ~]# yum install gcc -y
Loaded plugins: fastestmirror
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
14: curl#56 - "Recv failure: Connection reset by peer"One of the configured repositories failed (Unknown),and yum doesn't have enough cached data to continue. At this point the onlysafe thing yum can do is fail. There are a few ways to work "fix" this:1. Contact the upstream for the repository and get them to fix the problem.2. Reconfigure the baseurl/etc. for the repository, to point to a workingupstream. This is most often useful if you are using a newerdistribution release than is supported by the repository (and thepackages for the previous distribution release still work).3. Disable the repository, so yum won't use it by default. Yum will thenjust ignore the repository until you permanently enable it again or use--enablerepo for temporary usage:yum-config-manager --disable <repoid>4. Configure the failing repository to be skipped, if it is unavailable.Note that yum will try to contact the repo. when it runs most commands,so will have to try and fail each time (and thus. yum will be be muchslower). If it is a very temporary problem though, this is often a nicecompromise:yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=trueCannot find a valid baseurl for repo: base/7/x86_64

去修改它大致需要两步

第一步：vi /etc/resolv.conf，添加下面一行就可以了

nameserver 114.114.114.114（这是国内的dns服务器系统，还是比较好用的。谷歌的可以使用8.8.8.8）

或者

echo nameserver 114.114.114.114 > /etc/resolv.conf

修改完后service network restart进行重启，试一下yum update命令，应该就可以了。如果还不可以，可以再进行下一步。

第二步：

1. 在Linux系统中输入命令: vi /etc/sysconfig/network-scripts/ifcfg-ens33

2. 修改文件中的ONBOOT=no,将no改为yes

3. 重启服务: service network restart

如果是指定分配（类似）

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