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* [DOCS] Update remote cluster docs * Add files, rename files, write new stuff * Plethora of changes * Add test and update snippets * Redirects, moved files, and test updates * Moved file to x-pack for tests * Remove older CCS page and add redirects * Cleanup, link updates, and some rewrites * Update image * Incorporating user feedback and rewriting much of the remote clusters page * More changes from review feedback * Numerous updates, including request examples for CCS and Kibana * More changes from review feedback * Minor clarifications on security for remote clusters * Incorporate review feedback Co-authored-by: Yang Wang <ywangd@gmail.com> * Some review feedback and some editorial changes Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com> Co-authored-by: Yang Wang <ywangd@gmail.com>
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[[remote-clusters-settings]]
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=== Remote cluster settings
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The following settings apply to both <<sniff-mode,sniff mode>> and
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<<proxy-mode,proxy mode>>. Settings that are specific to sniff mode and proxy
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mode are described separately.
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`cluster.remote.<cluster_alias>.mode`::
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The mode used for a remote cluster connection. The only supported modes are
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`sniff` and `proxy`.
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`cluster.remote.initial_connect_timeout`::
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The time to wait for remote connections to be established when the node
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starts. The default is `30s`.
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`remote_cluster_client` <<node-roles,role>>::
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By default, any node in the cluster can act as a cross-cluster client and
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connect to remote clusters. To prevent a node from connecting to remote
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clusters, specify the <<node-roles,node.roles>> setting in `elasticsearch.yml`
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and exclude `remote_cluster_client` from the listed roles. Search requests
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targeting remote clusters must be sent to a node that is allowed to act as a
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cross-cluster client. Other features such as {ml} <<general-ml-settings,data
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feeds>>, <<general-transform-settings,transforms>>, and
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<<ccr-getting-started-tutorial,{ccr}>> require the `remote_cluster_client` role.
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`cluster.remote.<cluster_alias>.skip_unavailable`::
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Per cluster boolean setting that allows to skip specific clusters when no
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nodes belonging to them are available and they are the target of a remote
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cluster request. Default is `false`, meaning that all clusters are mandatory
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by default, but they can selectively be made optional by setting this setting
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to `true`.
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`cluster.remote.<cluster_alias>.transport.ping_schedule`::
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Sets the time interval between regular application-level ping messages that
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are sent to try and keep remote cluster connections alive. If set to `-1`,
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application-level ping messages to this remote cluster are not sent. If
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unset, application-level ping messages are sent according to the global
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`transport.ping_schedule` setting, which defaults to `-1` meaning that pings
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are not sent. It is preferable to correctly configure TCP keep-alives instead
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of configuring a `ping_schedule`, because TCP keep-alives are handled by the
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operating system and not by {es}. By default {es} enables TCP keep-alives on
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remote cluster connections. Remote cluster connections are transport
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connections so the `transport.tcp.*` <<transport-settings,advanced settings>>
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regarding TCP keep-alives apply to them.
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`cluster.remote.<cluster_alias>.transport.compress`::
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Per cluster setting that enables you to configure compression for requests
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to a specific remote cluster. This setting impacts only requests
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sent to the remote cluster. If the inbound request is compressed,
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Elasticsearch compresses the response. The setting options are `true`,
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`indexing_data`, and `false`. If unset, the global `transport.compress` is
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used as the fallback setting.
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`cluster.remote.<cluster_alias>.transport.compression_scheme`::
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Per cluster setting that enables you to configure compression scheme for
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requests to a specific remote cluster. This setting impacts only requests
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sent to the remote cluster. If an inbound request is compressed, {es}
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compresses the response using the same compression scheme. The setting options
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are `deflate` and `lz4`. If unset, the global `transport.compression_scheme`
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is used as the fallback setting.
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[[remote-cluster-sniff-settings]]
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==== Sniff mode remote cluster settings
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`cluster.remote.<cluster_alias>.seeds`::
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The list of seed nodes used to sniff the remote cluster state.
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`cluster.remote.<cluster_alias>.node_connections`::
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The number of gateway nodes to connect to for this remote cluster. The default
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is `3`.
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`cluster.remote.node.attr`::
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A node attribute to filter out nodes that are eligible as a gateway node in
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the remote cluster. For instance a node can have a node attribute
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`node.attr.gateway: true` such that only nodes with this attribute will be
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connected to if `cluster.remote.node.attr` is set to `gateway`.
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[[remote-cluster-proxy-settings]]
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==== Proxy mode remote cluster settings
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`cluster.remote.<cluster_alias>.proxy_address`::
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The address used for all remote connections.
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`cluster.remote.<cluster_alias>.proxy_socket_connections`::
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The number of socket connections to open per remote cluster. The default is
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`18`.
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[role="xpack"]
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`cluster.remote.<cluster_alias>.server_name`::
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An optional hostname string which is sent in the `server_name` field of
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the TLS Server Name Indication extension if
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<<encrypt-internode-communication,TLS is enabled>>. The TLS transport will fail to open
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remote connections if this field is not a valid hostname as defined by the
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TLS SNI specification. |