How to get ip address of a server on Centos 7 in bash

Question

Previously I used the following command in bash to find the main ip of my server

ipaddr=$(/sbin/ifconfig|grep inet|head -1|sed 's/\:/ /'|awk '{print $3}' | grep -v '127.0.0.1')

But in centos7 it no longer works since ifconfig isn't available and the command no longer works even if I install ifconfig using yum install net-tools

What is the equivalent command for centos 7

Thanks a lot

i think it's better to ask this question somewhere else like Superuser or Unix and Linux. — Avinash Raj
– Avinash Raj, Commented Jan 14, 2015 at 12:38
Is the output from ip addr show useful for you? You'll have to adjust the manner in which you parse it of course... — twalberg
– twalberg, Commented Jan 14, 2015 at 21:59

Alexander · Accepted Answer · 2019-05-06 17:18:36Z

124

You can use hostname command :

ipaddr=$(hostname -I)

-i, --ip-address: Display the IP address(es) of the host. Note that this works only if the host name can be resolved.

-I, --all-ip-addresses: Display all network addresses of the host. This option enumerates all configured addresses on all network interfaces. The loopback interface and IPv6 link-local addresses are omitted. Contrary to option -i, this option does not depend on name resolution. Do not make any assumptions about the order of the output.

edited May 6, 2019 at 17:18

answered Jan 14, 2015 at 20:47

Alexander

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6 Comments

user2363318 Over a year ago

For multiple interfaces (docker, flocker, etc) use echo $(hostname -I | cut -d" " -f 1) The first one is the default one.

fred Over a year ago

That -f 1 doesn't always work. On my VM that gives me 127.0.0.1. So I would have to use -f 2 to get the proper IP. If there is also an IP v6 address then it's questionable again if it gets the right IP.

SuperShalabi Over a year ago

For use within docker, I use $(hostname -i) instead. It gives me only one IP

edwardsmarkf Over a year ago

this also worked for me: dig +short myip.opendns.com @resolver1.opendns.com. ;

Dudi Boy Over a year ago

the first IP is: ipaddr=$(hostname -I|awk '{print $1}')

|

Siraj Alam · Accepted Answer · 2021-02-04 20:37:16Z

36

Ref: https://garbagevalue.com/blog/4-simle-ways-to-check-ip-adress-in-centos-7

I'm using CentOS 7 and command

ip a

is enough to do the job.

Edit

Just slice out the IP address part from that test.

ip a | grep 192

edited Feb 4, 2021 at 20:37

answered May 26, 2018 at 10:44

Siraj Alam

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3 Comments

brainLoop Over a year ago

have you got the sense of it?

Siraj Alam Over a year ago

A fairy came in my dreams to tell me this.

phreed Over a year ago

What package contains ip?

Rijul Sudhir · Accepted Answer · 2017-08-23 10:12:17Z

35

Enter the command ip addr at the console

answered Aug 23, 2017 at 10:12

Rijul Sudhir

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Comments

jperret · Accepted Answer · 2020-02-12 18:45:09Z

6

hostname -I | awk ' {print $1}'

answered Feb 12, 2020 at 18:45

jperret

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Will T · Accepted Answer · 2019-06-06 04:39:55Z

Bit late however I use

curl -4 icanhazip.com

returns the server Primary IP address.

Maarten Vanlinthout · Accepted Answer · 2016-08-14 08:48:02Z

3

SERVER_IP="$(ip addr show ens160 | grep 'inet ' | cut -f2 | awk '{ print $2}')"

replace ens160 with your interface name

answered Aug 14, 2016 at 8:48

Maarten Vanlinthout

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1 Comment

datakid Over a year ago

I don't think the cut -f2 does anything in this command. The awk should be sufficient.

datakid · Accepted Answer · 2017-12-08 04:47:05Z

3

Something like this - a riff on @maarten-vanlinthout's answer

ip -f inet a show eth0| grep inet| awk '{ print $2}' | cut -d/ -f1

answered Dec 8, 2017 at 4:47

datakid

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2 Comments

demented hedgehog Over a year ago

There is nothing worse than down-voting an answer without giving reasons why. Please, provide a reason and down-vote, or simply provide just the reason you have a problem with the answer.

Tuxinose Over a year ago

This version does not work anymore one modern Linux distros since the device simply has a different name. eth0, eth1 etc is not used anymore - at least on Red Hat 8, newer Fedoras, Opensuse, ...

Machavity · Accepted Answer · 2018-07-23 13:54:05Z

3

You can run simple commands like

curl ifconfig.co curl ifconfig.me wget -qO - icanhazip.com

edited Jul 23, 2018 at 13:54

Machavity♦

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answered Jul 23, 2018 at 13:51

Kernel

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Comments

Tuxinose · Accepted Answer · 2019-04-05 12:01:39Z

Actually, when you do not want to use external sources (or cannot), I would recommend:

DEVICE=$(ls -l /sys/class/net | awk '$NF~/pci0/ { print $(NF-2); exit }') IPADDR=$(ip -br address show dev $DEVICE | awk '{print substr($3,1,index($3,"/")-1);}')

The first line gets the name of the first network device on the PCI bus, the second one gives you its IP address.

BTW ps ... | grep ... | awk ... stinks. awk does not need grep.

That's the best one so far. Also, works on CentOS 8. But using more than one PCI card, it won't show IP address. Here's my version using only awk, and showing IP of all up interfaces IPADDR=$(ip -br address show | awk '$2 == "UP" {print substr($3,1,index($3,"/")-1);}')
My version was intended to yield the first card, that is what the first line takes care of. If that device is not up, you might end without IP address.

user2650277 · Accepted Answer · 2017-06-26 18:28:53Z

I believe that the most reliable way to get the external server ip address would be to use an external service.

ipaddr=$(curl -s http://whatismyip.akamai.com/)

mohammad hasan daneshvar · Accepted Answer · 2018-12-30 10:21:59Z

-2

Run this command to show ip4 and ip6:

ifconfig eth0 | grep inet | awk '{print $2}' | cut -d/ -f1

answered Dec 30, 2018 at 10:21

mohammad hasan daneshvar

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1 Comment

Roland Weber Over a year ago

The question explicitly says that ifconfig is no longer installed.

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