Create high-availability-tcie-2.x.md

Author: nrios14

user/enterprise/high-availability-tcie-2.x.md

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+---
+title: Enterprise High Availability Mode 2.x
+layout: en_enterprise
+
+---
+
+## Travis CI Enterprise 2.x
+
+Travis CI Enterprise 2.x typically runs as a single container instance communicating with one or multiple workers. Still, we also offer a High Availability configuration so you can run your installation with redundancy. High Availability Mode is a helpful way to have additional stability, particularly for customers with large-volume licenses.
+
+If you're interested, or might be interested, in running Travis CI Enterprise in High Availability mode, please email us at [[email protected]](mailto:enterprise@travis-cicom?subject:HA%20Mode), and we can discuss options and help you get started.
+
+### Installation Overview
+
+The platform installation is similar to the standard [Enterprise installation](/user/enterprise/setting-up-travis-ci-enterprise/#1-setting-up-enterprise-platform-virtual-machine), and the [worker installation](#installing-the-worker-in-high-availability-mode) is identical. However, there are some additional [system prerequisites](/user/enterprise/high-availability/), which means that to install in HA mode, you will need the following:
+ * 3+ **16 gigs of RAM, 8 CPUs, 40GB HDD**, i.e. `c4.2xlarge` with a 40GB HDD. - 2+ for the VMs running the Platform and 1+ for the VMs running the Worker
+ * [Redis](https://redis.io/), [RabbitMQ](https://www.rabbitmq.com/),
+and [Postgres](https://www.postgresql.org/) instances
+ * [GitHub OAuth app](/user/enterprise/setting-up-travis-ci-enterprise/#prerequisites), [trial license](/user/enterprise/setting-up-travis-ci-enterprise/#prerequisites) -- enabled for HA
+ * Internet connection -- note, this installation is _not_ airgapped by default. Let [us know](mailto:[email protected]) if you are interested in one.
+
+### Install the Platform in High Availability Mode
+
+HA is configured entirely on the Enterprise platform instance, but installing an HA platform is quite similar to installing a standard platform. The steps for HA are as follows.
+
+1. Contact [[email protected]](mailto:[email protected]?subject=HA%20Installation) to have your Enterprise license configured for HA mode.
+1. Set up your [platform instance using the standard installation steps](/user/enterprise/setting-up-travis-ci-enterprise/#1-setting-up-enterprise-platform-virtual-machine)
+1. Sign in to your Admin Dashboard (at `https://<your-travis-ci-enterprise-domain>:8800`)
+   1. Go to 'Settings' and click 'Enable HA'.
+   1. Paste in the URLs where you have [Postgres](https://www.postgresql.org/), [Redis](https://redis.io/), and [RabbitMQ](https://www.rabbitmq.com/) hosted. The connection strings should be in the format of:
+   ```
+   postgres://user:password@url:port
+   redis://user:password@url:port
+   amqps://user:password@url:port
+   ```
+   1. Optional: Upload a RabbitMQ Client Certificate (`.crt`). This allows RabbitMQ to use TLS.
+   1. Scroll down to the bottom of the page.
+   1. Click 'Save' and restart.
+
+Once your first platform instance is fully configured, you should be able to see the UI and request a build - your build will only run correctly if a worker is installed. Try out your new platform, and [please let us know](mailto:[email protected]?subject=HA%20Troubleshooting) if you have questions.
+
+#### Add more Platform Installations
+
+We recommend at least two Platform containers for HA mode, and you can install more Enterprise containers in the same way you [installed](/user/enterprise/setting-up-travis-ci-enterprise/#1-setting-up-enterprise-platform-virtual-machine) the first.
+
+Once your second platform is installed, its HA settings must also be configured. Go to the Admin Dashboard for your new platform container at `https://<your-second-travis-ci-enterprise-domain>:8800` to configure these as you did for [the first platform installation](#installing-the-platform-in-high-availability-mode).
+
+## Install the Worker in High Availability Mode (all versions)
+
+The worker installation works the same as non-HA installations, as do the build environment compatibility defaults per the Enterprise version. Check out the docs for which version of Enterprise handles different OS's([TCIE 2.x](/user/enterprise/setting-up-travis-ci-enterprise/#2-setting-up-the-enterprise-worker-virtual-machine) or [TCIE 3.x](/user/enterprise/tcie-3.x-setting-up-travis-ci-enterprise/#2-setting-up-the-enterprise-worker-virtual-machine) and other information regarding the installation. You must retrieve your RabbitMQ password from your installation rather than the Travis CI Enterprise Admin Dashboard.
+
+
+## Contact Enterprise Support
+
+{{ site.data.snippets.contact_enterprise_support }}