Simple script for detecting IP address of running virtual machine

virt

#!/bin/bash

if [[ $# == 0 ]]; then
    echo Usage:
    echo "virt <command> <vm> args"
    echo Command is: ip, ssh, scp, sshfs
    exit 1
fi

cmd="$1"; shift

destination="$1"
user=$(echo $destination | awk '{split($0,array,"@")} END {print array[1]}')
domain=$(echo $destination | awk '{split($0,array,"@")} END {print array[2]}')

if [ -z "$domain" ]; then
    domain=$user
    user=`whoami`
fi


ip=$(virt-ip $domain) || exit 1
shift

host="$user@$ip"

case "$cmd" in
    ip)
        echo $ip
        ;;
    ssh)
        virt-ssh "$host" $@
        ;;
    scp)
        virt-scp "$host" $@
        ;;
    sshfs)
        virt-sshfs "$host" $@
        ;;
esac

virt-ip

#!/bin/bash

# Inspired by Lars Kellogg-Stedman's script:
# http://blog.oddbit.com/post/getting-the-ip-address-of-a-libvirt-domain

function virsh_cmd {
    virsh -c qemu:///system $@
}

which xmllint &>/dev/null || (echo "xmllint not found, install libxml2 to get it." 1>&2 && exit 1)

if [[ $# == 0 ]]; then
    echo Enter a virtual machine name: 1>&2
    echo 1>&2
    virsh_cmd list 1>&2
    exit 1
fi

# Quit if we got an unknown domain name. `virsh` will print the error messages.
domain_xml=$(virsh_cmd dumpxml $1) || exit 1

# Get the MAC address of the first interface.
mac=$(echo "$domain_xml" |
    xmllint --xpath //interface'[1]/mac/@address' - |
    sed 's/.*="\([^"]*\)"/\1/'
    )

# Get the ip address assigned to this MAC from dnsmasq
ip=$(awk -vmac=$mac '$2 == mac {print $3}' /var/lib/libvirt/dnsmasq/default.leases)
echo $ip

virt-scp

#!/bin/bash

scp -o "StrictHostKeyChecking no" -o "UserKnownHostsFile /dev/null" $@

virt-ssh

#!/bin/bash

ssh -o "StrictHostKeyChecking no" -o "UserKnownHostsFile /dev/null" $@

virt-sshfs

#!/bin/bash

sshfs -o "StrictHostKeyChecking=no" -o "UserKnownHostsFile=/dev/null" $@

Changes from @petrblaho's gist 3607944:

• no need for sudo
• simplified getting the bridge name
• fixed issue where the ifconfig call returned "addr:192.168.1.*" instead of just the IP-formatted text

Updated to use /var/lib/libvirt/dnsmasq/default.leases where libvirt maintains the leased ip addresses. More robust than parsing the logs and whatnot.