By default, Elasticsearch binds to loopback addresses only — e.g.
[::1]. This is sufficient to run a single development node on a server.
In fact, more than one node can be started from the same
location on a single node. This can be useful for testing Elasticsearch’s
ability to form clusters, but it is not a configuration recommended for
In order to form a cluster with nodes on other servers, your
node will need to bind to a non-loopback address. While there are many
network settings, usually all you need to configure is
network.host setting also understands some special values such as
_global_ and modifiers like
:ip6, details of
which can be found in Special values for
As soon as you provide a custom setting for
Elasticsearch assumes that you are moving from development mode to production
mode, and upgrades a number of system startup checks from warnings to
exceptions. See Development mode vs production mode for more information.