I like when I can log into my notebook via ssh using some easily remembered name.
But it is not always a case in the world of NATs and VPNs.
If machine always have public IP address, than using some dynamic DNS service may help (short of necessity to use full domain name. But ${HOME}/.ssh/config may help). But what if you log into your office workstation via corporate VPN, and want ssh back home?
If you have enough power to run (or persuade system administrator to run) dyndns service in your office network, dyndns can help even there.
But your setup need to know different dyndns servers depending on IP address.
So, I wrote DYNGO is dynamic DNS client which can handle lots of dynamic DNS servers simultaneously. It reads config file, which specifies which network ranges correspond to which server, and then runs as a daemon, periodically polling IP addresses of all interfaces of the machine. If it finds change, it makes http(s) request to specified URL.
See manual page for more info.
dyngo uses protocol compatible with dyndns.org, as described pn help.dyn.com As different dynamic DNS servers use different path components of URL, you should specify URL with path component (up to question mark) in the server parameter of configuraton section.
dyngo is simple script which doesn't require anything but python3 with standard library and ip utility from iproute (or iproute2 on Debian) package, which presents on every modern Linux system.
I've even preferred to use urllib to requests to eliminate extra external dependency.
So, you can just drop dyngo somewhere in your filesystem, say in /usr/local/sbin and put config into /etc But dyngo should run as a service, so you might want to use provided service file.
dyngo should run as unprivileged user. But its configuration file should, readable for this user, contains somewhat sensitive information — your dyndns passwords. So, don't use common account many untrusted code run as such as nobody or www-data. Better to create special user dyngo.
There should be writable directory, writable for this user for persistent state database. By default it is /var/lib/dyngo.