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Running the Event Store

The Event Store runs as a server, to which clients can connect either over HTTP or using one of the client APIs. Both the open source, and commercial versions, can be run as either a single node, or a highly available cluster of nodes.

The open source version of Event Store is distributed as a console application. There are separate distributions for Windows on .NET and Linux/OS X on Mono.

Running the Open Source version

Unless passed a database option, the Event Store will write to a new database created in the system’s temporary files path each time it is started. For more information on Command Line Arguments look here.

On Windows and .NET

A typical command line for running the Event Store server on Windows is:

c:\EventStore> EventStore.ClusterNode.Exe --db .\ESData

Setting up HTTP Permissions

The Event Store has an HTTP interface. Consequently the identity under which you want to run the Event Store must have permission to listen to incoming HTTP requests, as detailed here.

In order to configure an account with permission to listen for incoming HTTP requests, you can execute the following in PowerShell, or the Command Prompt, running as administrator (replace DOMAIN\username with the actual account details, and the port number if the default port is not being used).

netsh http add urlacl url=http://+:2113/ user=DOMAIN\username

If you get 503 errors from the web UI

There is a known issue with the .NET HTTPListener class (which the Event Store uses) and bad URL ACL registrations which can cause servers to return 503 errors for every request. If you see this, you can issue the following commands:

netsh http show urlacl

Look for an entry on the port you’re trying to use (2113 unless you’ve specified a custom port). It will probably look something like: http://+:2113. Then issue:

netsh http delete urlacl <the entry you just found>

netsh http delete urlacl http://+:2113/

This should resolve the issue.

On Linux/OS X

A typical command line for running the Event Store server on Linux/OS X is:

$ ./run-node.sh --db ./ESData

Although you can run the Event Store binary directly, a run-node shell script is provided which exports the environment variable LD_LIBRARY_PATH to include the installation path of the Event Store, this is necessary if you are planning to use projections.

The Event Store builds for both Linux and OS X have the Mono runtime bundled in, this means that you do not need Mono installed locally to run Event Store.

Shutting down an Event Store node

Event Store has been designed to be safe by default - it is expected that it will but shut down using kill -9. However, it is also possible to initiate a shutdown via the web UI, by clicking on the “Shutdown Server” button located on the “Admin” page. This may be useful if you do not have console access to the node, or need to script initiating a shutdown.

Event Store docs are hosted on GitHub. The repository is public and it’s open to issues and pull requests. Contributions, corrections and feedback are all welcome.