Discovery: Zen Discovery Module

[kimchy]

An implementation of the discovery module built from the ground up to be optimized for elasticsearch. Supports both multicast and unicast discoveries with pluggable support (for simpler cloud integrations).

By default, the multicast discovery is enabled. Multicast settings:

# discovery.zen.ping.multicast.enabled: Is multicast discovery enabled. Defaults to `true`.
# discovery.zen.ping.multicast.address: The IP address to send the multicast packets on.
# discovery.zen.ping.multicast.port: The port to send the packets on. Defaults to `54328`.
# discovery.zen.ping.multicast.group: The multicast group address. Defaults to `224.2.2.4`.
# discovery.zen.ping.multicast.ttl: The packet time to live. Defaults to `3`.

The unicast discovery allows to perform discovery when multicast is disabled. Settings:

# discovery.zen.ping.unicast.hosts: Array of hosts to ping. By setting it, it will automatically enabled multicast.

Sample unicast setting:

discovery:
  zen.ping:
    multicast.enabled: false
    unicast.hosts:
      - 192.168.10.21:9300
      - 192.168.10.22:9301
      - 192.168.10.23:9302
      - 192.168.10.24:9303

There are more global settings that can be set, including:

# discovery.zen.master: Should this node be allowed to be a master in the cluster. Defaults to `true`. Note, when `node.client` is set to `true`, it will automatically set this setting to `false`.
# discovery.zen.initial_ping_timeout: The initial ping timeout to wait for discovery of other nodes. Defaults to `3s`.

[kimchy]

implemented.