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Ansible role for Nebula

Nebula is a scalable overlay networking tool with a focus on performance, simplicity and security.

And this ansible role for deploy nebula regular node and lighthouse node.

For this role you should have preconfigured host with nebula-cert which available via ansible.

Configure & Install

Place role directory in your Ansible installation, then create playbook and change host_vars for each hosts

There is playbook file for nebula role:

- name: Deploy Nebula
  hosts: "*"
  vars:
    # Ansible group with one or few lighthouse (hosts with routable IPs)
    # (make sure you set "nebula_port" and "external_addr" hostvars for that hosts). In this example we use ansible group named "nebula_lighthouses"
    lighthouses: "{{ groups['nebula_lighthouses'] }}"
    # Local range is used to define a hint about the local network range, which speeds up discovering the fastest
    # path to a network adjacent nebula node.
    local_range: "10.100.100.0/24"

	# Preconfigured nebula node with nebula-cert bin
    cert_authority: "lighthouse.example.com"

	# Path with nebula-bin file
    nebula_cert_path: "/var/lib/nebula/"
  roles:
    - role: nebula
  become: true

host_vars variables

nebula_ip - Internal IP (inside nebula network) for this host

nebula_host - IP address to bind nebula to (default: 0.0.0.0)

nebula_port - Nebula port (default: 4242)

nebula_subnet - Subnet size for sign in certificate (default: 8)

nebula_groups - Groups for host (default: nebula,node)

nebula_log_level - Log level (panic, fatal, error, warning, info, or debug) (default: info)

nebula_log_format - Log format, text or json (default: text)

nebula_dev_tun - Name of the tun device (default: nebula 1)

nebula_mtu - MTU for nebula interface (default: 1300)

nebula_tx_queue - Transmit queue length

nebula_lighthouse - Used to enable lighthouse functionality for a node (default: false)

nebula_dns - DNS listener (default: false)

nebula_dns_port - Port for DNS listener (default: 53)

nebula_dns_host - The DNS host defines the IP to bind the dns listener to (default: 0.0.0.0)

nebula_update_interval - Number of seconds between updates from this node to a lighthouse (default: 60)

nebula_prometheus_host - IP to bind prometheus to (default: 127.0.0.1)

nebula_prometheus_port - Port for prometheus (default: 9091)

nebula_prometheus_path - Metrics path (default: metrics)

nebula_drop_multicast - Toggles forwarding of multicast packets (default: false)

nebula_drop_local_broadcast - Toggles forwarding of local broadcast packets the address of which depends on the ip/mask encoded in pki.cert (default: false)

nebula_inbound_rules - Rules for inbound traffic

nebula_outbound_rules - Rules for outbound traffic

Example host_vars

nebula_ip: "10.100.100.20"

nebula_prometheus_port: 9991

# Unsafe routes allows you to route traffic over nebula to non-nebula nodes
# Unsafe routes should be avoided unless you have hosts/services that cannot run nebula
# NOTE: The nebula certificate of the "via" node *MUST* have the "route" defined as a subnet in its certificate
nebula_unsafe_routes:
  - network: "10.0.0.0/24"
    gateway: "10.100.100.1"
  - network: "10.10.0.0/24"
    gateway: "10.100.100.1"

nebula_inbound_rules: |
  - port: 443
    proto: tcp
    host: any

  - port: 80
    proto: tcp
    host: any

  - port: any
    proto: icmp
    host: any

nebula_outbound_rules: |
  - port: any
    proto: any
    host: any

MIT License.

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Ansible role for deploy Nebula overlay network

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