在CentOS 7中安装软件
在CentOS安装以后，执行ifconfig发现命令找不到，需要安装
[root@localhost ~]# ifconfig
-bash: ifconfig: command not found
首先设置yum源，设置为阿里的镜像，这样速度会快很多
- 备份，防止更改失败
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
- 从阿里的镜像，下载新的CentOS-Base.repo
[root@localhost yum.repos.d]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
-bash: wget: command not found
发现wget并没有安装，需要先安装wget，成功
[root@localhost yum.repos.d]# yum install wget
安装结束后再次重试下载新的CentOS-Base.repo
[root@localhost yum.repos.d]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
--2020-07-15 09:21:01-- http://mirrors.aliyun.com/repo/Centos-7.repo
Resolving mirrors.aliyun.com (mirrors.aliyun.com)... 124.193.244.231, 124.200.113.115, 124.200.113.111, ...
Connecting to mirrors.aliyun.com (mirrors.aliyun.com)|124.193.244.231|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2523 (2.5K) [application/octet-stream]
Saving to: ‘/etc/yum.repos.d/CentOS-Base.repo’
100%[====================================================================================================================================================================================================>] 2,523 --.-K/s in 0s
2020-07-15 09:21:01 (337 MB/s) - ‘/etc/yum.repos.d/CentOS-Base.repo’ saved [2523/2523]
- 使用yum安装ifconfig
首先对ifconfig进行查找
[root@localhost yum.repos.d]# yum search ifconfig
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
============================================================================================================= Matched: ifconfig ==============================================================================================================
net-tools.x86_64 : Basic networking tools
发现它在net-tools.x86_64这个包里面，直接使用yum安装，安装后再试试ifconfig已经能够运行。
[root@localhost ~]# ifconfig -a
enp0s3: flags=4163 mtu 1500
inet 10.0.2.4 netmask 255.255.255.0 broadcast 10.0.2.255
inet6 fe80::2d47:804c:6877:7ceb prefixlen 64 scopeid 0x20
ether 08:00:27:0f:83:3f txqueuelen 1000 (Ethernet)
RX packets 8195 bytes 11784042 (11.2 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 4074 bytes 257812 (251.7 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
enp0s8: flags=4163 mtu 1500
inet 192.168.31.95 netmask 255.255.255.0 broadcast 192.168.31.255
inet6 fe80::e4f5:6544:8b5c:9ea6 prefixlen 64 scopeid 0x20
ether 08:00:27:3d:0e:64 txqueuelen 1000 (Ethernet)
RX packets 39293 bytes 4918546 (4.6 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1323 bytes 213003 (208.0 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73 mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10
loop txqueuelen 1000 (Local Loopback)
RX packets 16 bytes 1408 (1.3 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 16 bytes 1408 (1.3 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
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