Quickstart

Networking

Networking on Unio Cloud is meant to be invisible when you do not care about it, and available when you do. Launch a server and it already has a private network and a public IPv4. Everything below is optional.

What you get automatically

A private network (10.100.0.0/24) created for your project on your first launch, with a router to the internet. All your servers land on it and can talk to each other privately.
A public IPv4 attached to every server at boot, included in the server price. This is the address you SSH to.
A firewall (security group) that allows SSH and ping inbound, and everything outbound. Nothing else is reachable until you open it.

Firewall rules

Open ports on the Security tab of a server. A rule is a direction, a protocol, a port or port range, and a source (inbound) or destination (outbound) in CIDR notation. Changes apply immediately.

typical rules

# common rules to add on the server's Security tab
inbound  TCP  80      0.0.0.0/0     # http
inbound  TCP  443     0.0.0.0/0     # https
inbound  TCP  5432    10.100.0.0/24 # postgres, private network only
inbound  TCP  22      198.51.100.7/32  # ssh from your office only

Restricting SSH to your own IP is the single highest-value rule you can add. Note that the firewall is enforced outside the VM, so a misconfigured rule cannot be bypassed from inside a compromised server, and you can still get in through the browser console if you lock yourself out.

Private networks

Use the private network for traffic between your own servers: a database that only your app server may reach, or a Redis cache that should never see the public internet. Create additional isolated networks under Networks when you want separate segments.

private-only services

# servers on the same network reach each other by private IP
ping 10.100.0.42

# bind services to the private IP so they are never exposed publicly
# postgresql.conf
listen_addresses = '10.100.0.42'

Floating IPs

A floating IP is a public address you own and can move between servers, which is how you do zero-downtime cutovers: build the new server, test it on its own IP, then move the floating IP over. Manage them under Floating IPs.

Each server's first public IP is included. Extra or unattached floating IPs cost €1.99 per month, billed hourly, because IPv4 addresses are genuinely scarce. Release the ones you do not need.

Traffic

Every server includes 20 TB of traffic per month. Inbound traffic and traffic between your servers on the private network are free.