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, Jan 14 '15 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, Jan 14 '15 at 21:59

Alexander · Answer 1 · 2019-05-06T17:18:36.443

121

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 06 '19 at 17:18

answered Jan 14 '15 at 20:47

Alexander

12,424
5
59
76

15

For multiple interfaces (docker, flocker, etc) use echo $(hostname -I | cut -d" " -f 1) The first one is the default one. – user2363318 Jun 23 '16 at 17:35
1

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. – fred Nov 24 '16 at 14:15
1

For use within docker, I use $(hostname -i) instead. It gives me only one IP – SuperShalabi Aug 29 '17 at 20:02
this also worked for me: dig +short myip.opendns.com @resolver1.opendns.com. ; – edwardsmarkf Mar 13 '18 at 20:58
1

the first IP is: ipaddr=$(hostname -I|awk '{print $1}') – Dudi Boy Dec 30 '18 at 15:52
This gets all the ip addresses. – WesternGun Feb 15 '19 at 22:19

Siraj Alam · Answer 2 · 2021-02-04T20:37:16.447

37

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 04 '21 at 20:37

answered May 26 '18 at 10:44

Siraj Alam

9,217
9
53
65

have you got the sense of it? – brainLoop Oct 26 '18 at 02:44
A fairy came in my dreams to tell me this. – Siraj Alam Oct 27 '18 at 06:34
What package contains `ip`? – phreed May 03 '22 at 20:52

score 36 · Answer 3 · answered Aug 23 '17 at 10:12

36

Enter the command ip addr at the console

answered Aug 23 '17 at 10:12

Rijul Sudhir

2,064
1
15
19

score 5 · Answer 4 · answered Feb 12 '20 at 18:45

5

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

answered Feb 12 '20 at 18:45

jperret

51
1
2

score 4 · Answer 5 · answered Dec 08 '17 at 04:47

4

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 08 '17 at 04:47

datakid

2,293
5
23
35

2

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. – demented hedgehog May 10 '18 at 01:46
1

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, ... – Tuxinose Feb 16 '21 at 17:08

score 3 · Answer 6 · answered Aug 14 '16 at 08:48

3

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

replace ens160 with your interface name

answered Aug 14 '16 at 08:48

Maarten Vanlinthout

31
1

1

I don't think the cut -f2 does anything in this command. The awk should be sufficient. – datakid Dec 08 '17 at 04:44

score 3 · Answer 7 · edited Jul 23 '18 at 13:54

3

You can run simple commands like

curl ifconfig.co

curl ifconfig.me

wget -qO - icanhazip.com

edited Jul 23 '18 at 13:54

Machavity

30,841
27
92
100

answered Jul 23 '18 at 13:51

Kernel

31
1

Tuxinose · Answer 8 · 2019-04-05T12:01:39.883

3

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.

edited Apr 05 '19 at 12:01

answered Apr 03 '19 at 15:46

Tuxinose

184
4

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);}')` – Orsiris de Jong Oct 01 '19 at 09:50
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. – Tuxinose Feb 06 '21 at 14:30

score 3 · Answer 9 · answered Jun 06 '19 at 04:39

3

Bit late however I use

curl -4 icanhazip.com

returns the server Primary IP address.

answered Jun 06 '19 at 04:39

Will T

647
5
16

score 0 · Answer 10 · answered Jun 26 '17 at 18:28

0

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/)

answered Jun 26 '17 at 18:28

user2650277

6,289
17
63
132

score -2 · Answer 11 · answered Dec 30 '18 at 10:21

-2

Run this command to show ip4 and ip6:

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

answered Dec 30 '18 at 10:21

mohammad hasan daneshvar

1
1

1

The question explicitly says that `ifconfig` is no longer installed. – Roland Weber Jan 23 '19 at 12:18

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

11 Answers11

Edit