CentOS 7.2最小安裝後不能使用ifconfig，netstat等命令是因為默認沒有安裝net-tools包，安裝好CentOS 7.2後連接網絡，通過默認的yum源可以安裝net-tools包，就可以使用上述命令了。

root@Slave02 ~]# ifconfig
-bash: ifconfig: command not found
[root@Slave02 ~]# ip add show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    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: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether fa:16:3e:41:78:4e brd ff:ff:ff:ff:ff:ff
    inet 10.128.71.238/24 brd 10.128.71.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::4130:c2bc:434f:5e29/64 scope link 
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether fa:16:3e:03:4f:42 brd ff:ff:ff:ff:ff:ff
[root@Slave02 ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth1
[root@Slave02 ~]# systemctl restart network.service
[root@Slave02 ~]# yum -y install net-tools
Loaded plugins: fastestmirror
base                                                                                                           | 3.6 kB  00:00:00     
extras                                                                                                         | 3.4 kB  00:00:00     
updates                                                                                                        | 3.4 kB  00:00:00     
(1/4): updates/7/x86_64/primary_db                                                                             | 3.6 MB  00:00:00     
(2/4): extras/7/x86_64/primary_db                                                                              | 130 kB  00:00:00     
(3/4): base/7/x86_64/group_gz                                                                                  | 156 kB  00:00:01     
(4/4): base/7/x86_64/primary_db                                                                                | 5.7 MB  00:00:08     
Determining fastest mirrors
 * base: mirrors.cn99.com
 * extras: mirrors.cn99.com
 * updates: mirrors.cn99.com
Resolving Dependencies
--> Running transaction check
---> Package net-tools.x86_64 0:2.0-0.22.20131004git.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

======================================================================================================================================
 Package                       Arch                       Version                                      Repository                Size
======================================================================================================================================
Installing:
 net-tools                     x86_64                     2.0-0.22.20131004git.el7                     base                     305 k

Transaction Summary
======================================================================================================================================
Install  1 Package

Total download size: 305 k
Installed size: 917 k
Downloading packages:
warning: /var/cache/yum/x86_64/7/base/packages/net-tools-2.0-0.22.20131004git.el7.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY
Public key for net-tools-2.0-0.22.20131004git.el7.x86_64.rpm is not installed
net-tools-2.0-0.22.20131004git.el7.x86_64.rpm                                                                  | 305 kB  00:00:00     
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
Importing GPG key 0xF4A80EB5:
 Userid     : "CentOS-7 Key (CentOS 7 Official Signing Key) <[email protected]>"
 Fingerprint: 6341 ab27 53d7 8a78 a7c2 7bb1 24c6 a8a7 f4a8 0eb5
 Package    : centos-release-7-4.1708.el7.centos.x86_64 (@anaconda)
 From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : net-tools-2.0-0.22.20131004git.el7.x86_64                                                                          1/1 
  Verifying  : net-tools-2.0-0.22.20131004git.el7.x86_64                                                                          1/1 

Installed:
  net-tools.x86_64 0:2.0-0.22.20131004git.el7                                                                                         

Complete!
[root@Slave02 ~]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.128.71.238  netmask 255.255.255.0  broadcast 10.128.71.255
        inet6 fe80::4130:c2bc:434f:5e29  prefixlen 64  scopeid 0x20<link>
        ether fa:16:3e:41:78:4e  txqueuelen 1000  (Ethernet)
        RX packets 13174  bytes 1492282 (1.4 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 393  bytes 63067 (61.5 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eth1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.20.238  netmask 255.255.255.0  broadcast 192.168.20.255
        inet6 fe80::5a63:7ec4:60ee:3a0  prefixlen 64  scopeid 0x20<link>
        ether fa:16:3e:03:4f:42  txqueuelen 1000  (Ethernet)
        RX packets 15654  bytes 11702290 (11.1 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 4383  bytes 328314 (320.6 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1  (Local Loopback)
        RX packets 408  bytes 32936 (32.1 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 408  bytes 32936 (32.1 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root@Slave02 ~]#

CentOS 7.2最小安裝後不能使用ifconfig，netstat等命令解決方法？