Configure networking#

Hostnames and IP addresses#

Update the server’s Pillar file:

network:
  host_id: ocp12
  ipv4: 198.51.100.34
  ipv6: 2001:db8::12

ipv6 is optional.

Netplan#

Netplan uses YAML files for configuration. Configurations are available for Linode and other hosts. The configuration is written to /etc/netplan/10-salt-networking.yaml.

Linode#

This configuration disables automatic IP configuration and configures static networking on IPv4 and IPv6.

Note

By default, a Linode server listens on – and prefers traffic to – its default IPv6 address. We use our own IPv6 block – 2a01:7e00:e000:02cc::/64 – to improve IP reputation and email deliverability.

One-time setup

Open a support ticket with Linode to request an IPv6 /64 block:

Hello,

Please provision an IPv6 /64 block for our account.

Thank you,

A /64 block is requested, because spam blocklists use /64 ranges.

Update the server’s Pillar file:

network:
  host_id: ocp12
  ipv4: 198.51.100.34
  ipv6: 2001:db8::12
  netplan:
    template: linode
    addresses:
      - 2001:db8::32/64 # SLAAC
    gateway4: 198.51.100.1
    gateway6: fe80::1

To fill in the above, from the Network tab on the Linode’s page, collect:

ipv4: The Address with a Type of IPv4 – Public
addresses: The Address with a Type of IPv6 – SLAAC, suffixed by “/64”
gateway4: The Default Gateway with a Type of IPv4 – Public
gateway6: The Default Gateway with a Type of IPv6 – SLAAC

For ipv6, use our IPv6 block with the hostname’s digits as the final group of the IPv6 address: for example, 2a01:7e00:e000:02cc::12 for ocp12.

Other hosting providers#

Note

This step is optional. Only override a Netplan configuration if necessary. For example, Hetzner’s installimage script creates a configuration file.

In the server’s Pillar file, set network.netplan.template to custom and set network.netplan.configuration:

network:
  host_id: ocp12
  ipv4: 198.51.100.34
  ipv6: 2001:db8::12
  netplan:
    template: custom
    configuration: |
      network:
        version: 2
        renderer: networkd
        ethernets:
          eth0:
            addresses:
              - 198.51.100.34/32
              ...

Time servers#

systemd-timesyncd synchronizes the local system clock with remote NTP servers.

You should select NTP servers from the NTP Pool Project that are close to the server’s location, in order to mitigate network latency and improve time accuracy.

For example, to use the NTP servers in Finland, add to the server’s Pillar file:

ntp:
  - 0.fi.pool.ntp.org
  - 1.fi.pool.ntp.org
  - 2.fi.pool.ntp.org
  - 3.fi.pool.ntp.org

By default, the NTP servers in the UK are used.