After installation Centos7 (core), the card not enabled by default. This is a pit, direct error, this is an over-optimization , there are a few developers / operation and maintenance personnel to install centos7 (core) without ssh to connect to the server.
Given as follows:
Loaded plugins: fastestmirror 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; Unknown error" http://mirror.centos.org/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirror.centos.org; Unknown error" Trying other mirror. One of the configured repositories failed (CentOS-7 - Base), 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=base ... 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 base or subscription-manager repos --disable=base 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=base.skip_if_unavailable=true failure: repodata/repomd.xml from base: [Errno 256] No more mirrors to try. http://mirror.centos.org/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirror.centos.org; Unknown error" [root@localhost ~]#
After the failure, the first to see the network is unobstructed
www.baidu the ping. COM # Google dns the ping 8.8.8.8
There was no more reaction, so think of it some time ago set once centos network card, so that he at startup. The following command
vi /etc/sysconfig/network-scripts/ifcfg-ens33
Modify the inside of the Boot = yes
The Boot = NO (do not start when the boot boot NIC) # change yes
Start card
ifup ens33
Check ip address
ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 00:0c:29:63:c2:ca brd ff:ff:ff:ff:ff:ff inet 192.168.152.141/24 brd 192.168.152.255 scope global noprefixroute dynamic ens33 valid_lft 1319sec preferred_lft 1319sec inet6 fe80::fdb9:c978:ff44:dbc5/64 scope link noprefixroute valid_lft forever preferred_lft forever
Virtual machine ip address is 192.168.152.141
Update the local cache:
yum makecache [root@promote ~]# yum makecache Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirrors.cn99.com * extras: mirrors.njupt.edu.cn * updates: mirrors.cn99.com base | 3.6 kB 00:00:00 extras | 3.4 kB 00:00:00 updates | 3.4 kB 00:00:00 (1/8): extras/7/x86_64/other_db | 127 kB 00:00:00 (2/8): extras/7/x86_64/filelists_db | 246 kB 00:00:00 (3/8): updates/7/x86_64/prestodelta | 797 kB 00:00:00 (4/8): updates/7/x86_64/other_db | 641 kB 00:00:00 (5/8): base/7/x86_64/other_db | 2.6 MB 00:00:01 (6/8): base/7/x86_64/filelists_db | 7.1 MB 00:00:02 (7/8): updates/7/x86_64/filelists_db | 4.4 MB 00:00:03 extras/7/x86_64/prestodelta FAILED http://mirrors.njupt.edu.cn/centos/7.6.1810/extras/x86_64/repodata/5bfd3d5f07606011226e556e87d978ca1dfe51a63e18d793182900d5bbc702b5-prestodelta.xml.gz: [Errno 14] HTTP Error 302 - Found Trying other mirror. (8/8): extras/7/x86_64/prestodelta | 65 kB 00:00:00 Metadata Cache Created