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Get IP address from VM

On this page I gathered approaches to get virtual machine ip address from host shell when VM already initialized and started.

Example 1. Simple command​

Simple example, only with shell commands:

$ vagrant ssh -c "ip address show eth0 | grep 'inet ' | sed -e 's/^.*inet //' -e 's/\/.*$//'" vm-instance-name

Example 2. Command with python​

Another example with python. More handy for complex logic and quick changes in code:

$ vagrant ssh -c "hostname -I | python3 -c 'import fileinput; ip=list(fileinput.input())[0].split(\" \")[0].strip(); print(ip)'" vm-instance-name

Example 2. Build inventory​

A bit more complex example to build list of hosts from running Vagrant environment

build-vagrant-inventory.sh
#!/bin/bash

function getIp {
    ip=$(vagrant ssh -c "hostname -I | python3 -c 'import fileinput; ip=list(fileinput.input())[0].split(\" \")[0].strip(); print(ip)'" $1)
    echo $ip
}

function getAllRunningVMList {
    for vm in $(vagrant status | grep running | awk '{print $1}')
    do
        echo $vm
    done
}

list=$(getAllRunningVMList)

rm -f inventory.list

for entry in $list
do
    ip=$(getIp $entry)
    echo "$entry:$ip" >> inventory.list
done

## Output file "inventory.list"
# consul-1:10.211.55.85
# consul-2:10.211.55.89
# consul-3:10.211.55.90
# lb-1:10.211.55.87
# gw-1:10.211.55.88
# srv-1:10.211.55.86