This is a backend for elixir Logger.

It will send logs out of lager to systemd journald.

the Logger.Backend.Journald is a custom backend for the elixir :logger application. To configure lager_journald_backend just add Logger.Backend.Journald the to your configuration like this:

config :logger,
  backends: [Logger.Backend.Journald]

Without any other configuration, the Logger.Backend.Journald will use info as default log level and "[$level] $message\n" as format for the log messages.

To provide own configuration add backends' configuration to configuration file:

config :logger,
  backends: [Logger.Backend.Journald]

config :logger, :logger_journald_backend,
  level: :debug,
  format: "[$level] $message\n",
  metadata: [:city]

and use it as:

Logger.error "TestLogMessage_Error", [city: "Berlin"]

And then simply check your journal for the corresponding message with the:

$ journalctl | sed '$!d'
Aug 20 17:55:37 localhost beam.smp[24082]: [error] TestLogMessage_Error

Logger provides two functions: add_backend/2 and configure_backend/2 to add backend and configure backend in runtime.

Usage:

Logger.add_backend(Logger.Backend.Journald, [])
Logger.configure(Logger.Backend.Journald, [level: :error, format: "$time $message"])

logger_journald_backend uses ejournald.