nebula.yml(5)

NAME
nebula.yml - nebula configuration files

DESCRIPTION
Configuration file for nebula(1) are written in YAML. Each section is described below:

  pki
The PKI section defines the location of credentials

ca
      Path to the CA certificate

cert
      Path to this node's certificate file

key
      Path to this node's key file

  static_host_map
The static host map defines a set of hosts with fixed IP addresses on the internet. Multiple addresses may be defined and Nebula will try each when establishing a tunnel.

  lighthouse
The lighthouse section allows the entablement and configuration of lighthouse behavior. In Nebula, lighthouses are nodes with ip fixed addresses which other nodes can use to located each other.

am_lighthouse
    Enables lighthouse behavior on this node. Should ONLY be true on nodes you have configured to be lighthouses on your network.

interval
    Number of seconds between updates from this node to a lighthouse. When a lighthouse receives an update, it sends information about its current IP address to each node.

hosts
    A list of lighthouse nodes this node should report to and query from. Should be empty on lighthouse nodes.

serve_dns
    Starts a DNS listener which responds to various queries (VAGUE) and be delegated for resolution.

  listen
Control the port and interface on which nebula listens.

host
    Set the ip to which nebula binds

port
    Set the port to which nebula binds

  punchy

punch
    Continue to punch inbound/outbound at a regular interval to avoid expiration of firewall NAT mapping

respond
    Configure the node to reach out and connect to you if your hole punching fails. This is extremely useful if one node is behind a difficult NAT, such as a symmetric NAT.

delay
    Delay a punch response for misbehaving NATs, default is 1 second, respond must be true to take effect

  cipher
Choose between the available ciphers for your network. Options are "chachapoly" or "aes." Must be identical across all nodes on a network.

  sshd
SSHD can expose information and administrative function via ssh

enabled
    If true, this enables SSHD administration

listen
    Host and port to listen on. (Port 22 is not allowed.)

host_key
    A file containing a list of authorized public keys

authorized_users
    A list of users each with an array of keys

  tun

disabled
    When tun is disabled, a lighthouse can be started without a local run interface (and therefore without root)

dev The name of the device

drop_local_broadcast
    Toggles forwarding of local broadcast packets, the address of which depends on the ip/mask encoded in the pki.cert

drop_multicast
    Drop the forwarding of multicast packets

tx_queue
    Sets the transmit queue length. (If you notice lots of transmit drops on the tun it may help to raise this number. Defaults to 500.

mtu Default MTU for every packet, safe setting is (and the default) 1300 for internet based traffic.

unsafe_routes
    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.

  logging
Configure logging

level
    Configure the logging level. Must be one of panic, fatal, error, warning, info, or debug.

format
    Either json or text

disable_timestamp
    Disables timestamp logging. Useful when redirected into to a logging system which appends a time stamp. Defaults to false.

  stats
Enable a statistics exporter.

type
    Type of statistics exporter. Either "prometheus" or "graphite"

interval
    Interval to provide updates for either graphite or prometheus.

prefix
    Prefix for graphite

protocol
    Protocol for graphite

host
    Listener for graphite

listen
    IP and port to bind the prometheus listener

path
    Path on which metrics are supplied in prometheus

namespace
    Prometheus namespace

subsystem
    Prometheus subsystem

message_metrics
    Enables counter metrics for meta packets. (e.g. message.tx.handshake)

lighthouse_metrics
    Enables detailed counter metrics for lighthouse packets (e.g. lighthouse.rx.HostQuery)

  handshakes
Handshakes are sent to all known addresses at each interval with a linear back off.

try_interval
    Nebula waits try_interval after the first attempt, 2 * try_interval on the second attempt, until the handshake is older than timeout. This allows you to control this interval.

retries
    Number of retries before timing out

trigger_buffer
    Size of the buffer channel for quickly sending handshakes after receiving the response for lighthouse queries

  firewall
The firewall is default deny. There is no way to write a deny rule. Rules are comprised of a protocol, port, and one or more of host, group, or CIDR. Logical evaluation is roughly: port AND proto AND (ca_sha OR ca_name) AND (host OR group OR groups OR CIDR)

outbound
    Section containing rules which apply to traffic send from this node. See the rules section.

inbound
    Section containing rules which apply to traffic send to this node from other hosts. See the rules section.

  rules
Rules are written in the outbound and inbound sections described above.

proto
      Protocol. One of "any", "tcp", "udp", or "icmp"

host
      "any" or literal hostname

group
      "any" or literal group name

groups
      Same as group but accepts a list of values. Certificate has to contain all groups to pass.

cidr
      a CIDR, "0.0.0.0/0" is any

ca_name
      An issuing CA name

ca_sum
      An issuing CA shasum

EXAMPLES

There is a example configuration file in the FILES section below.

Configuration files placed in /etc/nebula can take advantage of the built-in systemd templates. For example, if you have a nebula configuration /etc/nebula/office.yml
  [#] systemctl enable nebula@office.service

FILES

/etc/nebula
    Contains configuration files for nebula(1). This provides a designated place to store configuration data and credentials. Configuration files placed in this directory can take advantage of the provided systemd template unit.

/usr/share/doc/nebula/examples/config.yml
    See this example configuration file.

SEE ALSO
  nebula(1), nebula-cert(1)