Prerequisites

We want your experience with Elastic Cloud Enterprise to be a success, so we compiled a list of tried-and-tested prerequisites that will help get your installation off to a good start. To make it easier to look through these prerequisites, we separated them into sections for hardware, software, users, networking, and JVM Heap Sizes.

Hardware

Elastic Cloud Enterprise has specific hardware requirements for memory and storage. We have compiled information for the minimums required to install ECE, recommended minimums, and specific deployment scenarios.

Memory

Coordinators

Directors

Proxies

Allocators

Minimum to install

8 GB RAM

Minimum recommended

16 GB RAM

8 GB RAM

8 GB RAM

128 GB to 256 GB RAM1

Small deployment2

128 GB RAM

Medium deployment2

32 GB RAM

256 GB RAM

Large deployment3

32 GB RAM

16 GB RAM

256 GB RAM

1 Allocators must be sized to support your Elasticsearch clusters and Kibana instances. We recommend host machines that provide between 128 GB and 256 GB of memory. Smaller hosts might not pack larger Elasticsearch clusters and Kibana instances as efficiently. Larger hosts might provide fewer CPU resources per GB of RAM on average.

2 For high availability, requires three hosts each of the capacities indicated, spread across three availability zones.

3 For high availability, requires three hosts each of the capacities indicated (except for allocators), spread across three availability zones. For allocators, requires three or more hosts of the capacity indicated, spread across three availability zones.

There are some additional hardware requirements to make sure that Elastic Cloud Enterprise can work as intended, such as the requirement to use fast SSD storage for ECE management services. To learn more, see Choose the Right Host Machines.

The size of your Elastic Cloud Enterprise deployment has a bearing on the JVM heap sizes that you should specify during installation. To learn more, see JVM Heap Sizes. For examples, see the deployment scenarios in our Playbook for Production.

Storage

Coordinators

Directors

Proxies

Allocators

Minimum to install

At least 10 GB of free disk space

Minimum recommended

-

Enough storage to support the RAM-to-storage ratio1

1 For example, if you use a host with 256 GB of RAM and the default ratio of 1:32, your host must provide 8192 GB of disk space.

Software

The following software has been tested to work with Elastic Cloud Enterprise:

  • One of the following Linux distributions:

    • Ubuntu 14.04 LTS (Trusty Tahr; instructions)
    • Ubuntu 16.04 LTS (Xenial Xerus; instructions)
    • Red Hat Enterprise Linux 7 or later (RHEL 7; instructions, limitations)
    • CentOS 7 or later (instructions, limitations)

      Note

      Amazon Linux is not currently supported. If you attempt to install Elastic Cloud Enterprise on Amazon Linux, installation will likely fail with an error.

  • Linux kernel 3.10 or higher
  • Docker 1.11
  • File system:

    • We recommend that you use XFS, but any file system that supports the OverlayFS storage driver used by Docker can be used.
    • XFS is required if you want to use disk space quotas for Elasticsearch data directories.
    • On RHEL and CentOS, XFS file systems must be created with the -n ftype=1 option to make sure they can work with the OverlayFS storage driver used by Docker.
  • If SELinux is enabled: Your SELinux configuration must allow mounting Docker sockets into containers (required for cluster management to work)

Elastic Cloud Enterprise is certified for Linux kernel 3.10 or higher and Docker 1.11. The latter is the only version of Docker Elastic recommends.

If you intend to use Docker 1.12 or higher, please note:

  • You should avoid Linux kernel version 4.4 or lower, as there is a known issue with kernel memory (kmem) accounting.
  • While Elastic Cloud Enterprise may work with these Docker and kernel versions, it has not been thoroughly tested with them and might have issues. Elastic will attempt to support Elastic Cloud Enterprise running Docker version 1.12 or higher and kernel version 4.5 or higher, but we might not be able to resolve issues related to these configurations. In such cases, you will be asked to move to a certified kernel and Docker version, so that Elastic can support you.

Users

The following users and permissions are required:

  • To prepare your environment: A user with sudo permissions, such as the elastic user included with our AWS AMIs or the ubuntu user provided on Ubuntu.
  • To install Elastic Cloud Enterprise: A user with a UID and GID greater than or equal to 1000 who is part of the docker group. You must not install Elastic Cloud Enterprise as the root user.

You can find out information about a user with the id command:

id
uid=1000(elastic) gid=1000(elastic) groups=1000(elastic),4(adm),20(dialout),24(cdrom),25(floppy),27(sudo),29(audio),30(dip),44(video),46(plugdev),102(netdev),112(libvirtd),1001(docker)

In this example, the user elastic with a UID and GID of 1000 belongs to both the sudo and the docker groups.

Networking

Important

The first host you install Elastic Cloud Enterprise 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 Elastic Cloud Enterprise installation, only the ports for the roles that the initial host continues to hold need to remain open.

The following networking or internet access is required for Elastic Cloud Enterprise:

  • Internet access for a typical installation (offline installation is supported)
  • Outbound traffic open on the following ports:

    Host roleOutbound portsPurpose

    All

    80

    Installation script and docker.elastic.co Docker registry access (HTTP)

    All

    443

    Installation script and docker.elastic.co Docker registry access (HTTPS)

  • Inbound traffic open from any source on the following ports:

    Host roleInbound portsPurpose

    All

    22

    Installation and troubleshooting access only (SSH)

    Coordinator

    12300

    Elastic support access (HTTP)

    Coordinator

    12343

    Elastic support access (HTTPS)

    Coordinator

    12400

    Cloud UI and API access to the administration console (HTTP)

    Coordinator

    12443

    Cloud UI and API access to the administration console (HTTPS)

    Proxy

    9200/9243

    Kibana and Elasticsearch (HTTP/HTTPS), also required by load balancers

    Proxy

    9300/9343

    Elasticsearch (transport client/transport client with TLS/SSL), also required by load balancers

  • Internal components of Elastic Cloud Enterprise require inbound traffic open on the following ports:

    Host roleInbound portsPurpose

    Coordinator

    22191-22195

    Connections to initial coordinator from allocators and proxies (for up to five coordinators)

    Director

    12191-12201, 12898-12908, 13898-13908

    ZooKeeper stunnels (up to five are typically used)

    Director

    2112

    ZooKeeper ensemble discovery/joining

    Allocator

    18000-20000

    Elasticsearch (HTTP and transport)

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

Installation of Elastic Cloud Enterprise 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.

JVM Heap Sizes

Elastic Cloud Enterprise uses default JVM heap sizes for services that work for testing. For production systems, we recommend that you install ECE according to the JVM heap size recommendations in this section. Our recommendations are based on our longstanding experience with the Elastic Cloud hosted offering and our growing experience with Elastic Cloud Enterprise in customer settings. Other JVM heap sizes can be left at their defaults.

For small deployments, we recommend:

ServiceJVM Heap Size (Xms and Xmx)

runner

1 GB

allocator

4 GB

proxy

8 GB

zookeeper

4 GB

director

1 GB

constructor

4 GB

admin-console

4 GB

For medium deployments, we recommend:

ServiceJVM Heap Size (Xms and Xmx)

runner

1 GB

allocator

4 GB

proxy

8 GB

zookeeper

4 GB

director

1 GB

constructor

4 GB

admin-console

4 GB

For large deployments, we recommend:

ServiceJVM Heap Size (Xms and Xmx)

runner

1 GB

allocator

4 GB

proxy

8 GB

zookeeper

4 GB

director

1 GB

constructor

4 GB

admin-console

4 GB

You specify the recommended JVM heap sizes with --memory-settings JVM_SETTINGS parameter when you install Elastic Cloud Enterprise. For examples, see the deployment scenarios in our Playbook for Production.

Elasticsearch clusters and JVM Heap Size

For Elasticsearch clusters, Elastic Cloud Enterprise gives 50% of the available memory to the JVM heap used by Elasticsearch, while leaving the other 50% for the operating system. This memory won’t go unused, as Lucene is designed to leverage the underlying OS for caching in-memory data structures, meaning that Lucene will happily gobble up whatever is left over. The ideal heap size is somewhere below 32 GB, as heap sizes above 32 GB become less efficient.

What these recommendations mean is that on a 64 GB cluster, we dedicate 32 GB to the Elasticsearch heap and 32 GB to the operating system in the container that hosts your cluster. If you provision a 128 GB cluster, we create two 64 GB nodes, each node with 32 GB reserved for the Elasticsearch heap and 32 GB reserved for the operating system.

For more information about why heap sizes, memory for the operating system, and the 32 GB maximum for JVMs matter, see Heap: Sizing and Swapping.