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Getting Your IP From Anywhere

by Sonny Alves DiasMay 14th, 2021

Too Long; Didn't Read

There are several circumstances where you need to know the IP of your current machine. It may also be programmatically through a script or an Ansible playbook. To do that you can retrieve IPs and other info on your current instance. I deployed it myself, and it is available here: https://ip.alvesdi.com/ip-ip/geoip2/geolite2/golite-2/glyolite_2. I also made a script to automate the update of my databases daily using my license key.

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There are several circumstances where you need to know the IP of your current machine. It may also be programmatically through a script or an Ansible playbook.

To do that you can

curl

a website like ifconfig.co, icanhazip.com, or even myip.com (you need to parse the JSON though).

For example:

curl ifconfig.co

On an AWS instance, you can reliably
curl http://169.254.169.254/latest/meta-data/
to retrieve IPs and other info on your current instance.
More details there https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instancedata-data-retrieval.html

While these APIs are free, they are 3rd parties and may have API rate limits. One day they could also disappear or not function, right? To avoid any incident, we want to find a reliable solution that lasts. And if it can also work in an internal network without internet it would be perfect.

In that case, I recommend you create a new endpoint on any domain you like. And deploy the open-source software behind ifconfig.co: https://github.com/mpolden/echoip

I deployed it myself, and it is available here: https://ip.alvesdi.as

Here is how I did. First, I pulled the Docker image:

docker pull mpolden/echoip

Then to activate the Geolocation, I went to the MaxMind website here: https://dev.maxmind.com/geoip/geoip2/geolite2/

Signed up for a free account and downloaded the GeoLite 2 Databases for ASN, Cities, and Countries. I also made a script to automate the update of my databases daily using my license key. Here is the script I use:

#!/bin/bash
LICENSE_KEY= # Fill your key
wget "https://download.maxmind.com/app/geoip_download?edition_id=GeoLite2-ASN&license_key=${LICENSE_KEY}&suffix=tar.gz" -O ASN.tar.gz
wget "https://download.maxmind.com/app/geoip_download?edition_id=GeoLite2-City&license_key=${LICENSE_KEY}&suffix=tar.gz" -O City.tar.gz
wget "https://download.maxmind.com/app/geoip_download?edition_id=GeoLite2-Country&license_key=${LICENSE_KEY}&suffix=tar.gz" -O Country.tar.gz

for file in *.tar.gz; do tar xzvf "${file}" --strip-components 1 && rm "${file}"; done

And then here is how I start the container:

docker run --name ip -p 8080:8080 -d -v ./GeoLite2-ASN.mmdb:/GeoLite2-ASN.mmdb -v ./GeoLite2-City.mmdb:/GeoLite2-City.mmdb -v ./GeoLite2-Country.mmdb:/GeoLite2-Country.mmdb --restart=unless-stopped mpolden/echoip -H "X-Real-IP" -a /GeoLite2-ASN.mmdb -c /GeoLite2-City.mmdb -f /GeoLite2-Country.mmdb

I use

-H "X-Real-IP"

because I host it behind Nginx. FYI here is my Nginx configuration:

server {
    server_name ip.alvesdi.as;

    location / {
        proxy_set_header   X-Real-IP $remote_addr;
        proxy_set_header   Host      $http_host;
        proxy_pass         http://127.0.0.1:8080;
    }

    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/ip.alvesdi.as/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/ip.alvesdi.as/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

}
server {
    if ($host = ip.alvesdi.as) {
        return 301 https://$host$request_uri;
    } # managed by Certbot

    server_name ip.alvesdi.as;
    listen 80;
    return 404; # managed by Certbot
}