[root@hadoop1 ~]# ifconfig-bash: ifconfig: 未找到下令/Cannot find a va ...

[root@hadoop1 ~]# ifconfig-bash: ifconfig: 未找到下令
或：
[root@hadoop1 ~]# yum install -y epel-release
已加载插件：fastestmirror
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; 未知的错误"

 One of the configured repositories failed (未知),
 and yum doesn't have enough cached data to continue. At this point the only
 safe 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 working
        upstream. This is most often useful if you are using a newer
        distribution release than is supported by the repository (and the
        packages for the previous distribution release still work).
     3. Run the command with the repository temporarily disabled
            yum --disablerepo=<repoid> ...
     4. Disable the repository permanently, so yum won't use it by default. Yum
        will then just ignore the repository until you permanently enable it
        again or use --enablerepo for temporary usage:
            yum-config-manager --disable <repoid>
        or
            subscription-manager repos --disable=<repoid>
     5. 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 much
        slower). If it is a very temporary problem though, this is often a nice
        compromise:
            yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true
Cannot find a valid baseurl for repo: base/7/x86_64
问题。

原因：
可能镜像访问不了或其原因，需要更换镜像!

解决：
实行以下下令：

1.         执行以下命令：
3.         curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
5.         yum clean all
7.         yum makecache
9.         yum -y update

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再次实行：

1. [root@hadoop1 ~]# ifconfig
2. ens33: flags=41**<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
3.         inet 192.168.~.~  netmask 255.255.255.0  broadcast 192.168.*.***
4.         inet6 f***::4e6f:9aff:52eb:2e4d  prefixlen 64  scopeid 0x20<link>
5.         ether 00:*:29:54:d7:42  txqueuelen 1000  (Ethernet)

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已成功！
 

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