update_distributed_hosts.sh

#!/bin/bash

REPEAT=120 #2 minutes

# Wait for file
until [ -f "$1"  ]; do
    sleep 1

    # Timeout check
    if [ "$REPEAT" -gt 0 ]; then
        ((REPEAT--))
    else
        exit 1
    fi
done

# Remove exist hostname
sed -i '/ '$(hostname)'$/d' "$1" 2> /dev/null

# Write new hostname
echo "$(ip addr list | grep -oP '(?<=inet )([0-9]+.){3}[0-9]+' | tail -n1) $(hostname)" >> "$1"

# replace default hosts-file
rm -f /etc/hosts
ln -s "$1" /etc/hosts