The Restate Server has a wide range of configuration options to tune it according to your needs.
To learn about the configuration options, have a look at the full configuration reference.

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Configuration file

The Restate Server accepts a TOML configuration file that can be specified either providing the command-line option --config-file=<PATH> or setting the environment variable RESTATE_CONFIG=<PATH>. If not set, the default configuration will be applied.

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Overrides

Restate server accepts a sub-set of the configuration through command-line arguments, you can see all available options by adding --help to restate-server. The order of applying configuration layers follows the following order:
  1. Built-in defaults
  2. Configuration file (--config-file or via RESTATE_CONFIG)
  3. Environment variables
  4. Command line arguments (--cluster-name=<VALUE>)
Every layer overrides the previous. For instance, command-line arguments will override a configuration key supplied through environment variable (if set).

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Environment variables

You can override any configuration entry with an environment variable, this overrides values loaded from the configuration file. To do that, the following rule applies:
  • Prefix the configuration entry key with RESTATE_
  • Separate every nested struct with __ (double underscore) and all hyphens - with a _ (single underscore).
For example, to override the admin.bind-address, the corresponding environment variable is RESTATE_ADMIN__BIND_ADDRESS.

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Configuration introspection

If you want to generate a configuration file that includes values loaded from your environment variables or overrides applied to restate-server command-line, you can add --dump-config to dump the default TOML config with overrides applied: 
restate-server --cluster-name=mycluster --dump-config
Example output: 
roles = [
    "worker",
    "admin",
    "metadata-server",
    "log-server",
    "http-ingress",
]
cluster-name = "mycluster"
...
At any time, you ask restate daemon to print the loaded configuration to the log by sending a SIGUSR1 to the server process. This prints a dump of the live configuration to standard error. For instance on Mac/Linux, you can find the PID of restate-server by running: 
pgrep restate-server
994921
Then send the signal to the process ID returned from pgrep’s output: 
kill -USR1 994921
Observe the output of the server for a dump of the configuration file contents.