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LoggerFileBackend

A simple Logger backend which writes logs to a file. It does not handle log rotation for you, but it does tolerate log file renames, so it can be used in conjunction with external log rotation.

Note The following of file renames does not work on Windows, because File.Stat.inode is used to determine whether the log file has been (re)moved and, on non-Unix, File.Stat.inode is always 0.

Configuration

LoggerFileBackend supports the following configuration values:

  • path - the path to the log file
  • level - the logging level for the backend
  • format - the logging format for the backend
  • metadata - the metadata to include

Runtime configuration for mutiple log files

backends =[debug: [path: "/path/to/debug.log", format: ..., metadata: ...],
           error: [path: "/path/to/error.log", format: ..., metadata: ...]]

for {id, opts} <- backends do
  backend = {LoggerFileBackend, id}
  Logger.add_backend(backend)
  Logger.configure(backend, opts)
end

Application config for multiple log files

config :logger,
  backends: [{LoggerFileBackend, :info},
             {LoggerFileBackend, :error}]

config :logger, :info,
  path: "/path/to/info.log",
  level: :info

config :logger, :error,
  path: "/path/to/error.log",
  level: :error