Graylog IP Address Changes
If your running Graylog and looking to update it’s IP address you need to modify the server.conf file located in /etc/graylog/server/. Update the rest_listen_uri and web_listen_uri sections of the config and restart graylog service
Updating the IP address to your Graylog server requires taking a few additional steps beyond modifying the server’s IP.
Ubuntu Server 16.04 LTS running Graylog v2.3
sudo nano /etc/graylog/server/server.conf
Edit the following sections within the server.conf file:
rest_listen_uri = <new_ip> web_listen_uri = <new_ip>
Lastly you need to update your inputs and change the binding address to reflect the new IP: