当CentOS7进行最小化安装时，有很多工具包是没有的。

[root@vultr ~]# ifconfig-bash: ifconfig: command not found[root@vultr ~]# netstat-bash: netstat: command not found

　　我们经常会使用到的命令，ifconfig、netstat等都没有。因为缺失了net-tools包。

[root@vultr ~]# yum install -y net-tools    # 安装net-toolsLoaded plugins: fastestmirrorLoading mirror speeds from cached hostfile * base: mirror.wdc1.us.leaseweb.net * epel: reflector.westga.edu * extras: mirror.vcu.edu * updates: ftpmirror.your.orgResolving Dependencies--> Running transaction check---> Package net-tools.x86_64 0:2.0-0.24.20131004git.el7 will be installed--> Finished Dependency ResolutionDependencies Resolved============================================================================================================================================= Package                        Arch                        Version                                          Repository                 Size=============================================================================================================================================Installing: net-tools                      x86_64                      2.0-0.24.20131004git.el7                         base                      306 kTransaction Summary=============================================================================================================================================Install  1 PackageTotal download size: 306 kInstalled size: 918 kDownloading packages:net-tools-2.0-0.24.20131004git.el7.x86_64.rpm                                                                         | 306 kB  00:00:00     Running transaction checkRunning transaction testTransaction test succeededRunning transaction  Installing : net-tools-2.0-0.24.20131004git.el7.x86_64                                                                                 1/1   Verifying  : net-tools-2.0-0.24.20131004git.el7.x86_64                                                                                 1/1 Installed:  net-tools.x86_64 0:2.0-0.24.20131004git.el7                                                                                                Complete![root@vultr ~]# ifconfig | grep inet        inet 155.138.229.164  netmask 255.255.254.0  broadcast 155.138.229.255        inet6 fe80::5400:1ff:feff:86b7  prefixlen 64  scopeid 0x20
             inet 127.0.0.1  netmask 255.0.0.0        inet6 ::1  prefixlen 128  scopeid 0x10
     
      [root@vultr ~]# netstat -lnpActive Internet connections (only servers)Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      2746/sshd           tcp6       0      0 :::22                   :::*                    LISTEN      2746/sshd           udp        0      0 0.0.0.0:68              0.0.0.0:*                           3381/dhclient       udp        0      0 127.0.0.1:323           0.0.0.0:*                           1573/chronyd        udp6       0      0 ::1:323                 :::*                                1573/chronyd        Active UNIX domain sockets (only servers)Proto RefCnt Flags       Type       State         I-Node   PID/Program name     Pathunix  2      [ ACC ]     STREAM     LISTENING     12953    1/systemd            /run/systemd/privateunix  2      [ ACC ]     STREAM     LISTENING     14775    1/systemd            /run/dbus/system_bus_socketunix  2      [ ACC ]     STREAM     LISTENING     7397     1/systemd            /run/systemd/journal/stdoutunix  2      [ ACC ]     SEQPACKET  LISTENING     13039    1/systemd            /run/udev/control
     

　　安装net-tools工具包之后，ifconfig|netstat等网络相关的命令便能使用了。