CentOS7 安装ifconfig

As we all know, “ifconfig” command is used to configure a network interfaces in GNU/Linux systems. It displays the details of a network interface card like IP address, MAC Address, and the status of a network interface card etc. But, this command is obsolete, and is not found in the minimal versions of RHEL 7 and its clones like CentOS 7, Oracle Linux 7, and Scientific Linux 7.

How do I find IP and other details of a network interface In CentOS Minimal server?

CentOS 7 minimal systems, use the commands “ip addr” and “ip link” to find the details of a network interface card. To know the statistics use “ip -s link”.

To view the details of the network interface cards, enter the following commands:

ip addr

Sample output:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scope host lo

    inet6 ::1/128 scope host

       valid_lft forever preferred_lft forever

2: venet0: <BROADCAST,POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN

    link/void

    inet 127.0.0.1/32 scope host venet0

    inet 192.168.1.101/32 brd 192.168.1.101 scope global venet0:0

To view the statistics of your network interfaces, enter the command:

ip link

Sample output:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN mode DEFAULT

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

2: venet0: <BROADCAST,POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN mode DEFAULT

    link/void

ip -s link

Sample output:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN mode DEFAULT

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    RX: bytes  packets  errors  dropped overrun mcast   

    0          0        0       0       0       0      

    TX: bytes  packets  errors  dropped carrier collsns

    0          0        0       0       0       0      

2: venet0: <BROADCAST,POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN mode DEFAULT

    link/void

    RX: bytes  packets  errors  dropped overrun mcast   

    8515667    6667     0       0       0       0      

    TX: bytes  packets  errors  dropped carrier collsns

    300403     4249     0       0       0       0

How do I enable and use “ifconfig” Command in CentOS 7 minimal servers?

If you don’t know where to find the ifconfig command, follow the simple steps provided below. First let us find out which packages will provide ifconfig command. To do that , enter the following command:

yum provides ifconfig

Sample Output:

Loaded plugins: fastestmirror

Loading mirror speeds from cached hostfile

 * base: centos.aol.in

 * extras: centos.aol.in

 * updates: centos.aol.in

net-tools-2.0-0.17.20131004git.el7.x86_64 : Basic networking tools

Repo        : @base

Matched from:

Filename    : /usr/sbin/ifconfig

Or you can use the following command too.

yum whatprovides ifconfig

Here, “provides” or “whatprovides” switches are used to find out which package provides some feature or file.

As you see in the above output, the net-tools package provides the ifconfig command. So, let us install net-tools package to use ifconfig command.

yum install net-tools

Now, you’ll be able to use the command ifconfig as usual.

ifconfig -a

Sample output:

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 16436

        inet 127.0.0.1  netmask 255.0.0.0

        inet6 ::1  prefixlen 128  scopeid 0x10<host>

        loop  txqueuelen 0  (Local Loopback)

        RX packets 0  bytes 0 (0.0 B)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 0  bytes 0 (0.0 B)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

venet0: flags=211<UP,BROADCAST,POINTOPOINT,RUNNING,NOARP>  mtu 1500

        inet 127.0.0.1  netmask 255.255.255.255  broadcast 0.0.0.0  destination 127.0.0.1

        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 0  (UNSPEC)

        RX packets 7073  bytes 8549159 (8.1 MiB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 4611  bytes 359201 (350.7 KiB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

venet0:0: flags=211<UP,BROADCAST,POINTOPOINT,RUNNING,NOARP>  mtu 1500

        inet 192.168.1.101  netmask 255.255.255.255  broadcast 192.168.1.101  destination 192.168.1.101

        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 0  (UNSPEC)

Enjoy!