Networking prerequisites

The first host you install ECE on initially requires the ports for all roles to be open, which includes the ports for the coordinator, allocator, director, and proxy roles. After you have brought up your initial ECE installation, only the ports for the roles that the initial host continues to hold need to remain open. Before installing a host, make sure that ports 20000, 21000, and 22000 are open for the installation script checks. Port 2375 will also be utilized on each host you install ECE on for internal Docker communication.

For versions 2.4.0 and 2.4.1, IPv6 should remain enabled on any host with the Proxy role. In 2.4.2 and later, IPv6 can be disabled.

Inbound traffic

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When there are multiple hosts for each role, the inbound networking and ports can be represented by the following diagram:

ECE networking and ports

Table 1. Inbound traffic from any source

Number	Host role	Inbound ports	Purpose
	All	22	Installation and troubleshooting SSH access only (TCP)
2	Coordinator	12300/12343, 12400/12443	Admin API access (HTTP/HTTPS)
3	Proxy	9200, 9243	Elasticsearch REST API. 9200 is plain text and 9243 is with TLS, also required by load balancers
3	Proxy	9300, 9343	Elasticsearch transport client. 9300 is plain text and 9343 is with TLS, also required by load balancers
3	Proxy	9400, 9443	Elasticsearch Cross Cluster Search and Cross Cluster Replication with TLS authentication, also required by load balancers. Can be blocked if CCR/CCS is not used.
7	Coordinator	12400/12443	Cloud UI console to API (HTTP/HTTPS)

Inbound traffic from internal components of ECEIn addition to the following list, you should open 12898-12908 and 13898-13908 on the director host for ZooKeeper leader and election activity.

Number	Host role	Inbound ports	Purpose
1	Director	2112	ZooKeeper ensemble discovery/joining (TCP)
4	Director	12191-12201	Client forwarder to ZooKeeper, one port per director (TLS tunnels)
5	Allocator	19000-19999	Elasticsearch node to node and Proxy to Elasticsearch for CCR/CCS (Node Transport 6.x+/TLS 6.x+)
7	Coordinator	22191-22195	Connections to initial coordinator from allocators and proxies, one port per coordinator, up to five (TCP)
9	Proxy	9200/9243, 9300/9343	Kibana and Elasticsearch (HTTPS)
10	Allocator	18000-18999	Constructor to Elasticsearch cluster (HTTPS)
11	Allocator	18000-18999/20000-20999	Proxy to Elasticsearch/Kibana/APM Server instance (HTTPS/Transport Client 6.x+/TLS 6.x+)
	Allocator	21000-21999	APM Server (Instance Monitoring)
12	Allocator	23000-23999	Elasticsearch node to node and Proxy to Elasticsearch for CCR/CCS using Remote Cluster Security
13	Allocator	14000	Proxy to Allocator service endpoint (HTTPS)
14	Proxy	14043	API to Proxy for Allocator service traffic (HTTPS)

Outbound traffic

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Open these ports for outbound traffic:

Host role	Outbound ports	Purpose
All	80	Installation script and docker.elastic.co Docker registry access (HTTP)
All	443	Installation script and docker.elastic.co Docker registry access (HTTPS)

Hosts in multiple data centers

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A typical ECE installation should be contained within a single data center. We recommend that ECE installations not span different data centers, due to variations in networking latency and bandwidth that cannot be controlled.

Installation of ECE across multiple data centers might be feasible with sufficiently low latency and high bandwidth, with some restrictions around what we can support. Based on our experience with our hosted Elastic Cloud service, the following is required:

A typical network latency between the data centers of less than 10ms round-trip time during pings
A network bandwidth of at least 10 Gigabit

If you choose to deploy a single ECE installation across multiple data centers, you might need to contend with additional disruptions due to bandwidth or latency issues. Both ECE and Elasticsearch are designed to be resilient to networking issues, but this resiliency is intended to handle exceptions and should not be depended on as part of normal operations. If Elastic determines during a support case that an issue is related to an installation across multiple data centers, the recommended resolution will be to consolidate your installation into a single data center, with further support limited until consolidation is complete.

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