Gnome桌面右键弹出终端。
[root@localhost ~]# yum repolist
已加载插件：fastestmirror, langpacks
/var/run/yum.pid 已被锁定，PID 为 2611 的另一个程序正在运行。
Another app is currently holding the yum lock; waiting for it to exit...
[root@localhost ~]# yum makecache
已加载插件：fastestmirror, langpacks
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist http://mirrorlist.centos.org/?
Cannot find a valid baseurl for repo: base/7/x86_64
[root@localhost ~]# sudo nano /etc/yum.repos.d/CentOS-Base.repo
修改镜像站点为aliyun服务器写入，保存
[root@localhost ~]# yum makecache
已加载插件：fastestmirror, langpacks
Loading mirror speeds from cached hostfile
元数据缓存已建立
[root@localhost ~]# yum install httpd
重启
[root@localhost ~]# systemctl start httpd.service
[root@localhost ~]# systemctl status httpd.service 查看状态
● httpd.service - The Apache HTTP Server
Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled)
[root@localhost ~]# ifconfig 查看ip地址
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.159.129 netmask 255.255.255.0 broadcast 192.168.159.255
inet6 fe80::2c10:185e:e5c4:821f prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:15:0c:28 txqueuelen 1000 (Ethernet)
RX packets 46624 bytes 69433792 (66.2 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 7699 bytes 475065 (463.9 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0