How to get ip address of a server on Centos 7 in bash
BashIp AddressCentos7Bash Problem Overview
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 $3}' | grep -v '127.0.0.1')
But in centos7 it no longer works since ifconfig isn't available and the command no longer works even if I install ifconfig using yum install net-tools
What is the equivalent command for centos 7
Thanks a lot
Bash Solutions
Solution 1 - Bash
You can use hostname command :
ipaddr=$(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.
Solution 2 - Bash
Enter the command ip addr at the console
Solution 3 - Bash
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
Solution 4 - Bash
hostname -I | awk ' {print $1}'
Solution 5 - Bash
Something like this - a riff on @maarten-vanlinthout's answer
ip -f inet a show eth0| grep inet| awk '{ print $2}' | cut -d/ -f1
Solution 6 - Bash
SERVER_IP="$(ip addr show ens160 | grep 'inet ' | cut -f2 | awk '{ print $2}')"
replace ens160 with your interface name
Solution 7 - Bash
You can run simple commands like
curl ifconfig.co
curl ifconfig.me
wget -qO - icanhazip.com
Solution 8 - Bash
Actually, when you do not want to use external sources (or cannot), I would recommend:
DEVICE=$(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($3,"/")-1);}')
The first line gets the name of the first network device on the PCI bus, the second one gives you its IP address.
BTW ps ... | grep ... | awk ...
stinks. awk does not need grep.
Solution 9 - Bash
Bit late however I use
curl -4 icanhazip.com
returns the server Primary IP address.
Solution 10 - Bash
I believe that the most reliable way to get the external server ip address would be to use an external service.
ipaddr=$(curl -s http://whatismyip.akamai.com/)
Solution 11 - Bash
Run this command to show ip4 and ip6:
ifconfig eth0 | grep inet | awk '{print $2}' | cut -d/ -f1