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System Requirements

EWC requires Ubuntu, RHEL or CentOS Linux. It is not supported on any other Linux distributions. The table below lists the supported Linux versions, along with the Vagrant Boxes and Amazon AWS instances we use for testing. See below for more details about our Linux distribution support policy.

If you are installing from ISO, perform a minimal installation. For Ubuntu, use the “Server” variant, and only add OpenSSH Server to the base set of packages. All other dependencies will be automatically added when you install EWC.


Please note that only 64-bit architecture is supported.

Linux (64-bit) Vagrant Box Amazon AWS AMI
Ubuntu 14.04 bento/ubuntu-14.04 Ubuntu Server 14.04 LTS (HVM)
Ubuntu 16.04 bento/ubuntu-16.04 Ubuntu 16.04 LTS - Xenial (HVM)
RHEL 7 / CentOS 7 bento/centos-7.4 Red Hat Enterprise Linux (RHEL) 7.2 (HVM)
RHEL 6 / CentOS 6 bento/centos-6.7 Red Hat Enterprise Linux (RHEL) 6 (HVM)

This is the recommended minimum sizing for testing and deploying EWC:

Testing Production
  • Dual CPU
  • 2GB RAM
  • 10GB storage
  • Recommended EC2: t2.medium
  • Quad core CPU
  • >16GB RAM
  • 40GB storage
  • Recommended EC2: m4.xlarge


If you are planning to add the DC Fabric Automation Suite to your system later, you will need additional RAM. Check the DC Fabric Automation Suite System Requirements

If you split your filesystem into multiple partitions and mount points, ensure you have at least 1GB of free space in /var and /opt. RabbitMQ and MongoDB may not operate correctly without sufficient free space.

By default, EWC and related services use these TCP ports:

  • nginx (80, 443)
  • mongodb (27017)
  • rabbitmq (4369, 5672, 25672)
  • postgresql (5432)
  • st2auth (9100)
  • st2api (9101)
  • st2stream (9102)

If any other services are currently using these ports, EWC may fail to install or run correctly.

Linux Distribution Support Policy

StackStorm only support Ubuntu and RHEL/CentOS Linux distributions. In general, it is supported on the two most recent major supported releases for those distributions. Specifically:

  • Ubuntu: All current LTS releases are supported, from the time of their first .1 release - e.g. 16.04.1 - until the Ubuntu end of life date. Currently we support Ubuntu 14.04 and 16.04. We aim to test and validate Ubuntu 18.04, when it is released later in 2018.

    At that point, Ubuntu 14.04 will be considered deprecated. It will continue to be supported until April 2019, when it goes end of life. No ongoing testing will be done with Ubuntu 14 after April 2019.

  • RHEL/CentOS: We currently support RHEL/CentOS 6.x and 7.x. In general, we recommend using the most recent version in that series, but any version may be used. When RHEL 8.0 is released, we will test and validate it. At that point, RHEL 6.x should be considered deprecated.

    When RHEL 8.1 is released, EWC support for RHEL 6.x will finish. No ongoing testing will be done with RHEL 6.x after that date.