Cluster: Daemons
Phabricator User Documentation (Cluster Configuration)

Configuring Phabricator to use multiple daemon hosts.

Overview

You can run daemons on multiple hosts. The advantages of doing this are:

  • you can completely survive the loss of multiple daemon hosts; and
  • worker queue throughput may improve.

This configuration is simple, but you must configure repositories first. For details, see Cluster: Repositories.

Since repository hosts must run daemons anyway, you usually do not need to do any additional work and can skip this entirely if you have already configured multiple repository hosts.

Adding Daemon Hosts

After configuring repositories for clustering, launch daemons on every repository host according to the documentation in Cluster: Repositories. These daemons are necessary: repositories will not fetch, update, or synchronize properly without them.

If your repository clustering is redundant (you have at least two repository hosts), these daemons are also likely to be sufficient in most cases. If you want to launch additional hosts anyway (for example, to increase queue capacity for unusual workloads), see "Dedicated Daemon Hosts" below.

Dedicated Daemon Hosts

You can launch additional daemon hosts without any special configuration. Daemon hosts must be able to reach other hosts on the network, but do not need to run any services (like HTTP or SSH). Simply deploy the Phabricator software and configuration and start the daemons.

Normally, there is little reason to deploy dedicated daemon hosts. They can improve queue capacity, but generally do not improve availability or increase resistance to data loss on their own. Instead, consider deploying more repository hosts: repository hosts run daemons, so this will increase queue capacity but also improve repository availability and cluster resistance.

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